Detecting Hooked Function Sandbox Evasion

To avoid some actions on the system by the malware like deleted a file. Cuckoo will hook some function and performs another action instead of the original one. For example the function DeleteFileW could be hooked to avoid file deletion.

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.

Evading Specific Signature Antivirus/EDR Evasion

Some signatures are specifically designed to catch an exploit or a specific behaviour. By reversing the signature, it is possible to modify the malware to evade the signature. For example, by changing the size of the payload matching, or by changing the file's header.

PE Format Manipulation Antivirus/EDR Evasion

Evading signature can also be performed by modifying the PE structure (changing section names, TimeDateStamp, MajorLinkerVersion/MinorLinkerVersion, Major/Minor OperatingSystemVersion and ImageVersion/MinorImageVersion, AddressOfEntryPoint, Maximum number of sections, File length.

Fake Signature Antivirus/EDR Evasion

Every exe file contain metadata that allow users to trust the third party that distribute the program. Malware are able to usurp the metadata in order to fool the user but also the security tools.

Process Hollowing, RunPE Process Manipulating

Process hollowing is a technique used by malware to evade detection by injecting malicious code into a legitimate process. This technique involves creating a new instance of a legitimate process and replacing its original code with the malicious payload.

The process is the following:

CreateProcess: in a suspended mode with the CreationFlag at 0x0000 0004.
…

Shortcut Hiding Antivirus/EDR Evasion

Windows shortcut can be used to store code that downloads a malicious file from the internet, or that stores the malicious file directly within the shortcut itself. This can make it difficult for antivirus software to detect the malicious application, as the file is not stored in a typical location on the computer. Additionally, the use of a shortcut can …

Redirect Antivirus Website Antivirus/EDR Evasion

To avoid connection to anti malware website, malware can modify the host file to redirect the connexion.

Process Reimaging Process Manipulating

Process Reimaging is a technique used to evade detection by endpoint security solutions. It is a variation of the Process Hollowing or Process Doppelganging techniques, which are used to execute arbitrary code in the context of another process.

The Windows operating system has inconsistencies in how it determines the locations of process image FILE_OBJECTs, which can impact the ability …

Execution Guardrails: Environmental Keying Defense Evasion [Mitre]

Adversaries may environmentally key payloads or other features of malware to evade defenses and constraint execution to a specific target environment. Environmental keying uses cryptography to constrain execution or actions based on adversary supplied environment specific conditions that are expected to be present on the target. Environmental keying is an implementation of Execution Guardrails that utilizes cryptographic techniques for deriving …

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