Evading Hash Signature Antivirus/EDR Evasion

AV are able to detect if it's a known malware by calculating the file hash, by changing a simple bit into the binary can sometimes allow the sample to evade hash detection. This technique is unlikely to work anymore.

TLS Callback Anti-Debugging

TLS (Thread Local Storage) callbacks are a mechanism in Windows that allows a program to define a function that will be called when a thread is created. These callbacks can be used to perform various tasks, such as initializing thread-specific data or modifying the behavior of the thread.

As an anti-debugging technique, a program can use a TLS callback …

Dynamically Computed Target Address Anti-Disassembly

Dynamically computed target addresses is an anti-disassembling technique that involves using dynamically computed addresses as the targets of branch instructions in a program. This can make it difficult for a disassembler to accurately reconstruct the original instructions of the program, as the disassembler will not be able to determine the correct target addresses for the branch instructions without actually executing …

Code Cave Antivirus/EDR Evasion

A code cave is a series of null bytes in a process's memory. The code cave inside a process's memory is often a reference to a section of the code’s script functions that have capacity for the injection of custom instructions. For example, if a script’s memory allows for 5 bytes and only 3 bytes are used, then the remaining …

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 …

Return Address Spoofing Antivirus/EDR Evasion

Return Address Spoofing is a technique used in x64 architecture to bypass the limitations of the x64 fastcall mechanism. The traditional method of spoofing return addresses in x86 (e.g. using a ret in a game module as a trampoline) is not feasible in x64 due to caller cleanup and red zone.

To overcome this, the code creates a temporary …

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 …

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