Anti-Monitoring

Parent process is a technique used by malware to evade detection by security analysts. The parent process of a given process is the process that spawned it.

For example, most user processes on a Windows system have explorer.exe as their parent process. By checking the parent process of a given process, malware can determine whether it is being monitored …

Process Manipulating

Defense Evasion [Mitre]

Adversaries may spoof the parent process identifier (PPID) of a new process to evade process-monitoring defenses or to elevate privileges. New processes are typically spawned directly from their parent, or calling, process unless explicitly specified.

One way of explicitly assigning the PPID of a new process is via the CreateProcess API call, which supports a parameter that defines the …

Defense Evasion [Mitre]

Adversaries may inject malicious code into suspended and hollowed processes in order to evade process-based defenses. Process hollowing is a method of executing arbitrary code in the address space of a separate live process.

Process hollowing is commonly performed by creating a process in a suspended state then unmapping/hollowing its memory, which can then be replaced with malicious code. …

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 …