Search Evasion Techniques
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Obfuscated Files or Information: Steganography Defense Evasion [Mitre]
Adversaries may use steganography techniques in order to prevent the detection of hidden information. Steganographic techniques can be used to hide data in digital media such as images, audio tracks, video clips, or text files.
Duqu was an early example of malware that used steganography. It encrypted the gathered information from a victim's system and hid it within an …
ScrubCrypt Packers
ScrubCrypt is a malware obfuscation and encryption framework, derived from the earlier JLaive Batchfuscator crypter. It is designed to aid cybercriminals in evading detection and analysis by using a variety of techniques to conceal and protect the malicious software.
ScrubCrypt is advertised on cybercrime forums to employ encryption, code morphing, and (allegedly) polymorphism to create obfuscated malware payloads that …
C2 via FTP(S) Network Evasion
C2 via FTP is a technique that utilizes the File Transfer Protocol (FTP) to establish command and control communication between an attacker and victim systems. It involves sending commands and receiving responses within FTP sessions, effectively using FTP as a conduit for covert communication.
To implement C2 via FTP, an attacker needs control over an FTP server, and must …
LimeCrypter Packers
Limecrypter is a sophisticated obfuscation tool designed for both native and .NET files. It employs a unique approach to secure payloads by encrypting them within a .NET-based stub. This stub acts as a container for the encrypted payload, ensuring its contents remain concealed until execution.
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 …
Entry Point Modification Process Manipulating
The entry point is the starting point of an executable file during execution. Some malware use techniques such as changing or relocating the real entry point to protect their code from analysis. This makes it difficult for security software to identify and detect the malware as the code is not executed in the usual way.