Add Queue APC injection signature

[kevross33]

Pikabot (also other malware like AgentTesla etc.)

[gemini-code-assist]

Summary of Changes

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This pull request introduces a new detection signature designed to identify Asynchronous Procedure Call (APC) injection attempts. This technique is frequently employed by various malware families, including Pikabot and AgentTesla, to execute malicious code within legitimate processes. The new signature enhances the system's ability to detect and flag such evasive behaviors by monitoring specific Windows API calls for suspicious cross-process activity.

Highlights

• New APC Injection Signature: A new signature, ApcInjection, has been added to detect Asynchronous Procedure Call (APC) injection, a technique used by malware for code execution and evasion.
• API Monitoring: The signature specifically monitors NtQueueApcThread and QueueUserAPC API calls to identify suspicious activity.
• Cross-Process Detection: It focuses on detecting cross-process APC injections where a non-null APC routine is queued to a thread in a different process, a common indicator of malicious intent.

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Changelog

• modules/signatures/windows/injection_thread.py
  • Added a new ApcInjection class to detect cross-process APC injection.

Activity

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Code Review

This pull request adds a new signature to detect APC injection. The implementation is a good start, but has a significant logic flaw that could lead to false positives. I've provided a suggestion to fix the cross-process detection logic and make it more robust. I also included a minor style fix. After addressing these points, the signature should be much more reliable.