Search Evasion Techniques
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System Binary Proxy Execution: Mavinject Defense Evasion [Mitre]
Adversaries may abuse mavinject.exe to proxy execution of malicious code. Mavinject.exe is the Microsoft Application Virtualization Injector, a Windows utility that can inject code into external processes as part of Microsoft Application Virtualization (App-V).
Adversaries may abuse mavinject.exe to inject malicious DLLs into running processes (i.e. Dynamic-link Library Injection), allowing for arbitrary code execution (ex. C:\Windows\system32\mavinject.exe PID /INJECTRUNNING PATH_DLL). Since …
System Binary Proxy Execution: Mshta Defense Evasion [Mitre]
Adversaries may abuse mshta.exe to proxy execution of malicious .hta files and Javascript or VBScript through a trusted Windows utility. There are several examples of different types of threats leveraging mshta.exe during initial compromise and for execution of code.
Mshta.exe is a utility that executes Microsoft HTML Applications (HTA) files. HTAs are standalone applications that execute using the same models …
System Binary Proxy Execution: Compiled HTML File Defense Evasion [Mitre]
Adversaries may abuse Compiled HTML files (.chm) to conceal malicious code. CHM files are commonly distributed as part of the Microsoft HTML Help system. CHM files are compressed compilations of various content such as HTML documents, images, and scripting/web related programming languages such VBA, JScript, Java, and ActiveX. CHM content is displayed using underlying components of the Internet Explorer browser …
Hide Artifacts: VBA Stomping Defense Evasion [Mitre]
Adversaries may hide malicious Visual Basic for Applications (VBA) payloads embedded within MS Office documents by replacing the VBA source code with benign data.
MS Office documents with embedded VBA content store source code inside of module streams. Each module stream has a PerformanceCache that stores a separate compiled version of the VBA source code known as p-code. The p-code …
Trusted Developer Utilities Proxy Execution: MSBuild Defense Evasion [Mitre]
Adversaries may use MSBuild to proxy execution of code through a trusted Windows utility. MSBuild.exe (Microsoft Build Engine) is a software build platform used by Visual Studio. It handles XML formatted project files that define requirements for loading and building various platforms and configurations.
Adversaries can abuse MSBuild to proxy execution of malicious code. The inline task capability of MSBuild …
XSL Script Processing Defense Evasion [Mitre]
Adversaries may bypass application control and obscure execution of code by embedding scripts inside XSL files. Extensible Stylesheet Language (XSL) files are commonly used to describe the processing and rendering of data within XML files. To support complex operations, the XSL standard includes support for embedded scripting in various languages.
Adversaries may abuse this functionality to execute arbitrary files while …
Virtualization/Sandbox Evasion: System Checks Defense Evasion [Mitre]
Adversaries may employ various system checks to detect and avoid virtualization and analysis environments. This may include changing behaviors based on the results of checks for the presence of artifacts indicative of a virtual machine environment (VME) or sandbox. If the adversary detects a VME, they may alter their malware to disengage from the victim or conceal the core functions …
Themida Packers
Themida is a commercial known packer that embeds several features including anti-debugging, virtual machine emulation, encryption...
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Anti-debugger techniques that detect/fool any kind of debugger
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Anti-memory dumpers techniques for any Ring3 and Ring0 dumpers
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Different encryption algorithms and keys in each protected application
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Anti-API scanners techniques that avoids reconstruction of original import table
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Automatic decompilation and scrambling techniques in target application …
System Binary Proxy Execution: Control Panel Defense Evasion [Mitre]
Adversaries may abuse control.exe to proxy execution of malicious payloads. The Windows Control Panel process binary (control.exe) handles execution of Control Panel items, which are utilities that allow users to view and adjust computer settings.
Control Panel items are registered executable (.exe) or Control Panel (.cpl) files, the latter are actually renamed dynamic-link library (.dll) files that export a CPlApplet …
Detecting Online Sandbox Sandbox Evasion
Online sandbox has become very popular for malware analysis. Several malware authors employ such techniques to avoid detection and analysis. Some of these techniques will be summarized here.
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Any.Run uses a fake root certificate to spy on sandbox traffic. The first information about the system can be obtained by querying the information of the root certificate. In addition, the QEMU …