Search Evasion Techniques
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CPU Counting Sandbox Evasion
In many sandboxes, due to virtualization constraints, the number of CPUs may be limited to one. However, in the real world, all x86 CPUs have been sold with multiple cores or at least hyperthreading for over a decade.
As a result, it is sometimes possible to detect virtualization or sandboxing by examining the number of CPUs on the system. …
Process Injection: Dynamic-link Library Injection Defense Evasion [Mitre]
Adversaries may inject dynamic-link libraries (DLLs) into processes in order to evade process-based defenses as well as possibly elevate privileges. DLL injection is a method of executing arbitrary code in the address space of a separate live process.
DLL injection is commonly performed by writing the path to a DLL in the virtual address space of the target process …
OutputDebugString Anti-Debugging
This Windows API is often used by developers for debugging purpose. It will display a text to the attached debugger. This API is also used by Malware to open a communication channel between one or multiple processes.
It is possible to use OutputDebugString in addition of GetLastError / SetLastError to detect debugger presence.
BobSoft Mini Delphi Packer Packers
The Delphi programming language can be an easy way to write applications and programs that leverage Windows API functions. In fact, some actors deliberately include the default libraries as a diversion to hamper static analysis and make the application "look legit" during dynamic analysis.
The packer goes to great lengths to ensure that it is not running in an …
Windows Event Log Evasion via Native APIs Anti-Forensic
Attackers can leverage native Windows API calls to install malicious services without generating correlating entries in the event log. Using native APIs to install services instead of the standard API calls allow attackers to bypass security controls and event logging. This technique was utilised by Stuxnet.
Services are typically created through a standard Windows API call CreateServiceA or CreateService …
Modify Registry Defense Evasion [Mitre]
Adversaries may interact with the Windows Registry to hide configuration information within Registry keys, remove information as part of cleaning up, or as part of other techniques to aid in persistence and execution.
Access to specific areas of the Registry depends on account permissions, some requiring administrator-level access. The built-in Windows command-line utility Reg may be used for local …
Process Injection: Portable Executable Injection Defense Evasion [Mitre]
Adversaries may inject portable executables (PE) into processes in order to evade process-based defenses as well as possibly elevate privileges. PE injection is a method of executing arbitrary code in the address space of a separate live process.
PE injection is commonly performed by copying code (perhaps without a file on disk) into the virtual address space of the …
Process Injection: Thread Execution Hijacking Defense Evasion [Mitre]
Adversaries may inject malicious code into hijacked processes in order to evade process-based defenses as well as possibly elevate privileges. Thread Execution Hijacking is a method of executing arbitrary code in the address space of a separate live process.
Thread Execution Hijacking is commonly performed by suspending an existing process then unmapping/hollowing its memory, which can then be replaced …
Process Injection: Asynchronous Procedure Call Defense Evasion [Mitre]
Adversaries may inject malicious code into processes via the asynchronous procedure call (APC) queue in order to evade process-based defenses as well as possibly elevate privileges. APC injection is a method of executing arbitrary code in the address space of a separate live process.
APC injection is commonly performed by attaching malicious code to the APC Queue of a …
Process Injection: Process Hollowing Defense Evasion [Mitre]
Adversaries may inject malicious code into suspended and hollowed processes in order to evade process-based defenses. Process hollowing is a method of executing arbitrary code in the address space of a separate live process.
Process hollowing is commonly performed by creating a process in a suspended state then unmapping/hollowing its memory, which can then be replaced with malicious code. …