Search Evasion Techniques
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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 …
FLIRT Signatures Evasion Anti-Disassembly
FLIRT Signature evasion is a technique used by malware to hide malicious code inside legitimate functions from known libraries. FLIRT (Fast Library Identification and Recognition Technology) is a database that contains signature patterns for identifying known functions from legitimate libraries.
Malware authors can abuse these signatures by modifying or adding specific bytes to the code, so that it appears …
DLL Proxying Process Manipulating
DLL proxying is a technique used by malware to evade detection and gain persistence on a system. It involves replacing a legitimate DLL with a malicious DLL that has the same exported functions and is named similarly to the legitimate DLL.
When a program attempts to load the legitimate DLL, it will instead load the malicious DLL, which acts …
Dirty Vanity Process Manipulating
Dirty Vanity is a process injection technique that exploits the Windows forking (process reflection and snapshotting) feature to inject code into a new process.
It uses the RtlCreateProcessReflection or NtCreateProcess[Ex] primitives, along with the PROCESS_VM_OPERATION, PROCESS_CREATE_THREAD, and PROCESS_DUP_HANDLE flags to reflect and execute code in a new process.
The technique also makes use of various methods, …
Milfuscator Packers
Milfuscator is a tool used to obfuscate the code in a Portable Executable (PE) file by modifying and expanding the existing code in the ".text" section, without creating any new sections. It does this using the Zydis and AsmJit libraries, and is based on the concept of code mutation from a P2C project for the game Counter-Strike: Global Offensive. The …
Avoiding Memory Scanners (Yara, Pe-sieve...) Others
Avoiding Memory Scanners is a technique that enables malware creators to bypass the detection of endpoint security software and reverse engineers by using memory scanning to locate shellcode and malware in Windows memory.
The technique involves understanding how memory scanners work and implementing a stable evasion method for each of the memory scanning tools, such as PE-sieve, MalMemDetect, Moneta, …
AddVectoredExceptionHandler Anti-Debugging
The AddVectoredExceptionHandler technique is an anti-debugging method that can detect the presence of debuggers using Vectored Exception Handlers. This technique works by calling AddVectoredExceptionHandler(1, ourHandler) to register a top-level exception handler that will catch any exceptions raised by the process, including those generated by debuggers.
After this call has taken place, stepping through the code will trigger an EXCEPTION_SINGLE_STEP …
Hell's Gate Antivirus/EDR Evasion
The Hell's Gate technique refers to a specific method used by malware authors to make their software more difficult to detect and analyze. The technique involves the use of a custom native API resolver to resolve Windows API functions at runtime dynamically.
By using Hell's Gate, malware can avoid referencing the Windows API functions directly in the Import Address …
Shikata Ga Nai (SGN) Data Obfuscation
Shikata Ga Nai (SGN) is a data obfuscation technique that employs a polymorphic binary encoding scheme. It was initially developed by Ege Balci and gained popularity through its implementation in Metasploit Framework's msfvenom. SGN takes a binary input and generates a self-decoding obfuscated shellcode. The algorithm utilizes a XOR feedback loop for encoding and prefixes a decoding routine to the …
TrueCrypt Packers
TrueCrypt, a crypter developed and sold by the developers behind Meduza Stealer, which features LoadPE functionality and is written in Golang, supports both native (x32) and .NET binaries. This crypter has been used by Lumma, Vidar, Raccoon, MetaStealer, Redline stealers, and DCRAT.