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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
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DoubleAgent

DoubleAgent is a new Zero-Day technique for injecting code and maintaining persistence on a machine (i.e. auto-run).

DoubleAgent can exploit:

  • Every Windows version (Windows XP to Windows 10)
  • Every Windows architecture (x86 and x64)
  • Every Windows user (SYSTEM/Admin/etc.)
  • Every target process, including privileged processes (OS/Antivirus/etc.)

DoubleAgent exploits a 15 years old legitimate feature of Windows and therefore cannot be patched.

Code Injection

DoubleAgent gives the attacker the ability to inject any DLL into any process. The code injection occurs extremely early during the victim’s process boot, giving the attacker full control over the process and no way for the process to protect itself. The code injection technique is so unique that it’s not detected or blocked by any antivirus.

Persistency

DoubleAgent can continue injecting code even after reboot making it a perfect persistence technique to “survive” reboots/updates/reinstalls/patches/etc. Once the attacker decides to inject a DLL into a process, they are forcefully bounded forever. Even if the victim would completely uninstall and reinstall its program, the attacker’s DLL would still be injected every time the process executes.

Attack Vectors

  • Attacking Antivirus & Next Generation Antivirus – Taking full control of any antivirus by injecting code into it while bypassing all of its self-protection mechanism. The attack has been verified and works on all the major antiviruses including but not limited to: Avast, AVG, Avira, Bitdefender, Comodo, ESET, F-Secure, Kaspersky, Malwarebytes, McAfee, Norton, Panda, Quick Heal and Trend Micro. For more details, checkout our Taking Full Control Over Your Antivirus article.

  • Installing Persistent Malware – Installing malware that can “survive” reboots and are automatically executed once the operating system boots.

  • Hijacking Permissions – Hijacking the permissions of an existing trusted process to perform malicious operations in disguise of the trusted process. e.g. Exfiltrating data, C&C communication, lateral movement, stealing and encrypting sensitive data.

  • Altering Process Behavior – Modifying the behavior of the process. e.g. Installing backdoors, weakening encryption algorithms, etc.

  • Attacking Other Users/Sessions – Injecting code to processes of other users/sessions (SYSTEM/Admin/etc.).

Technical Deep Dive

For more details, checkout our technical article.

Installation

  1. Clone/Download the DoubleAgent source code.
  2. Build the main solution twice, once in x86 and once in x64. This step is crucial as it creates both x86 and x64 versions of DoubleAgentDll.dll which is required in order to perform a successful installation.
  3. Copy the entire bin folder to the target machine.
  4. Execute the installer:
    Usage: DoubleAgent.exe install\uninstall\repair process_name
    e.g. DoubleAgent.exe install cmd.exe
    
    Note that the 32bit installer (DoubleAgent_x86.exe) can be used both on Windows x86 and Windows x64. But the 64bit installer (DoubleAgent_x64.exe) can be used only on Windows x64.
  5. The next time the target process loads DoubleAgentDll.dll would be injected into it.

Authors

Cybellum Technologies LTD (http://cybellum.com/)

About

Zero-Day Code Injection and Persistence Technique

Resources

Stars

31 stars

Watchers

4 watching

Forks

Releases

Packages

Contributors

Languages