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Search Evasion Techniques

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XOR Operation Data Obfuscation

The XOR operation is a common technique used by malware to hide data. This is because it is a simple and reversible function, meaning that the same operation can be used to both encode and decode data. In the XOR operation, a key is used to create a ciphertext, which is then used to encrypt the original data.

The …

hXOR Packer Packers

hXOR Packer is a PE (Portable Executable) packer with Huffman Compression and Xor encryption.

The unpacker will decompress and decrypt the packed PE and execute it directly from memory without needing any hard disk space to execute.

Custom Encoding Data Obfuscation

Malware often uses custom encoding schemes to conceal their payloads and avoid detection. These custom schemes can be full custom layers, or they can be variations of known algorithms such as XOR or Base64. Using custom encoding schemes allows malware to encode their payloads in a unique way that can be difficult for security tools and forensic investigators to detect.

…

Constant Blinding Data Obfuscation

Constant blinding can be employed by malware authors to obfuscate their malicious code, making it harder for security researchers and antivirus software to detect and analyze the malware. By using constant blinding techniques, the malware code can be concealed, increasing its chances of evading detection and maintaining persistence on the target system.

Here's how constant blinding can be utilized …

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 …

ProcEnvInjection - Remote code injection by abusing process environment strings Process Manipulating

This method allows to inject custom code into a remote process without using WriteProcessMemory - It will use the lpEnvironment parameter in CreateProcess to copy the code into the target process. This technique can be used to load a DLL into a remote process, or simply execute a block of code.

The lpEnvironment parameter in CreateProcess allows us to …

Cronos-Crypter Packers

Cronos-Crypter is an open-source crypter publicly available on GitHub. The crypter applies AES encryption or XOR obfuscation to a selected payload before storing it as a .NET resource of a final generated .NET executable payload. Cronos-Crypter contains multiple capabilties for persistence and defense evasion. An operator may select persistence via a Windows Registry autorun key or a Scheduled Task. An …

XProtect Encryption Abuse Data Obfuscation

Malware can abuse Apple's macOS XProtect string encryption algorithm to hide critical strings, including commands, browser paths, extension IDs, cryptocurrency wallet locations, and command-and-control (C2) details.

This technique leverages the same XOR-based encryption logic implemented in macOS’s XProtect antivirus engine, this encryption is used for “encrypted YARA rules stored within the XProtect Remediator binaries”.

The encryption process involves …

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