Search Evasion Techniques
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Default Windows Wallpaper Check Sandbox Evasion
Adversaries may employ various user activity 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. In this particular case, the malware checks to see if the wallpaper set on the machine is the default Windows …
Detecting Virtual Environment Artefacts Sandbox Evasion
Qemu registers some artifacts into the registry. A malware can detect the Qemu installation with a look at the registry key HARDWARE\\DEVICEMAP\\Scsi\\Scsi Port 0\\Scsi Bus 0\\Target Id 0\\Logical Unit Id 0 with the value of Identifier and the data of QEMU or HARDWARE\\Description\\System with a value of SystemBiosVersion and data of QEMU.
The VirtualBox Guest addition leaves many …
Detecting Hooked Function Sandbox Evasion
To avoid some actions on the system by the malware like deleted a file. Cuckoo will hook some function and performs another action instead of the original one. For example the function DeleteFileW could be hooked to avoid file deletion.
Stalling Code Sandbox Evasion
This technique is used for delaying execution of the real malicious code. Stalling code is typically executed before any malicious behavior. The attacker’s aim is to delay the execution of the malicious activity long enough so that an automated dynamic analysis system fails to extract the interesting malicious behavior.
Checking Recent Office Files Sandbox Evasion
Another way to detect if the malware is running in a real user machine is to check if some recent Office files was opened.
GetTickCount Anti-Debugging
This is typical timing function which is used to measure time needed to execute some function/instruction set. If the difference is more than fixed threshold, the process exits.
GetTickCount reads from the KUSER_SHARED_DATA page. This page is mapped read-only into the user mode range of the virtual address and read-write in the kernel range. The system clock tick updates …
Geofencing Others
Geofencing in malware refers to a technique used by cybercriminals to restrict the distribution or activation of malicious software based on geographical location. Malware authors use geofencing to target specific regions or avoid certain areas, such as their home country, in order to evade detection, minimize the chances of being investigated, or maximize the effectiveness of their attacks.
Geofencing …