Parent Process Detection Anti-Monitoring

Parent process is a technique used by malware to evade detection by security analysts. The parent process of a given process is the process that spawned it.

For example, most user processes on a Windows system have explorer.exe as their parent process. By checking the parent process of a given process, malware can determine whether it is being monitored …

VMCPUID Sandbox Evasion

The VMCPUID instruction is a sophisticated mechanism often employed by malware to ascertain if it is operating within a virtual environment.

This instruction is part of the x86 architecture's virtual machine extensions (VMX) and is designed to provide information about the capabilities and status of the virtual machine.

By using VMCPUID, malware can adapt its behavior based on …

Checking Screen Resolution Sandbox Evasion

Sandbox environments typically do not function as standard user workspaces; as a result, they often maintain a minimum screen resolution of 800x600 or even lower. In practice, users seldom work with such limited screen dimensions. Malware may leverage this information, detecting the screen resolution to ascertain whether it is operating on a genuine user machine or within a sandbox environment.

Connected Printer Sandbox Evasion

Another technique for detecting if a program is running in a sandbox is to look for potential connected printers or identify the default Windows printers, Adobe, or OneNote. This is because sandboxes typically do not have access to printers, and detecting the absence of printers can help identify whether the program is being run in a sandbox environment.

Disabling Antivirus Antivirus/EDR Evasion

Some forms of malware are programmed to disable antivirus software and evade detection by security measures. These malicious programs can use specific commands or techniques to undermine the antivirus software's effectiveness and remain hidden from detection..

Process Hollowing, RunPE Process Manipulating

Process hollowing is a technique used by malware to evade detection by injecting malicious code into a legitimate process. This technique involves creating a new instance of a legitimate process and replacing its original code with the malicious payload.

The process is the following:

CreateProcess: in a suspended mode with the CreationFlag at 0x0000 0004.
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Shortcut Hiding Antivirus/EDR Evasion

Windows shortcut can be used to store code that downloads a malicious file from the internet, or that stores the malicious file directly within the shortcut itself. This can make it difficult for antivirus software to detect the malicious application, as the file is not stored in a typical location on the computer. Additionally, the use of a shortcut can …

NtSetDebugFilterState Anti-Debugging

The NtSetDebugFilterState and DbgSetDebugFilterState functions are used by malware to detect the presence of a kernel mode debugger. These functions allow the malware to set up a debug filter, which is a mechanism that can be used to detect and respond to the presence of a debugger.

When a kernel mode debugger is present, the debug filter will be …

Guard Pages Anti-Debugging

Memory breakpoints are a technique used by malware to detect if a debugger is present. This technique involves setting up a "guard page" in memory, which is a page of memory that is protected by the operating system and cannot be accessed by normal code. If a debugger is present, the malware can use this guard page to detect its …

Thread Execution Hijacking Process Manipulating

Thread execution hijacking is a technique used by malware to evade detection by targeting an existing thread of a process and avoiding any noisy process or thread creation operations. This technique allows the malware to run its code within the context of the targeted thread, without creating new processes or threads, which can be easily detected by security software.

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