Add Queue APC injection signature#537
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! 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
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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.
| targetpid = self.get_argument(call, "ProcessId") | ||
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| if str(apc_routine) != "0x00000000" and pid != targetpid: | ||
| if target_thread not in self.apc_targets: | ||
| self.apc_targets.add(target_thread) | ||
| self.mark_call() | ||
| self.ret = True |
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The current logic for detecting cross-process APC injection is flawed and can lead to false positives.
targetpidcan beNoneif theProcessIdargument is not available for the API call. In this case, the comparisonpid != targetpidwill evaluate toTrue, causing any APC call without aProcessIdto be flagged incorrectly.- The comparison
pid != targetpidcompares an integer with a string, which is unreliable. The target PID should be explicitly cast to an integer for a safe comparison. - Comparing
apc_routineas a string to"0x00000000"is brittle. It's more robust to convert it to an integer and check if it's non-zero.
The suggested change addresses these issues by ensuring targetpid exists, performing a safe type conversion, and using a more robust check for apc_routine.
| targetpid = self.get_argument(call, "ProcessId") | |
| if str(apc_routine) != "0x00000000" and pid != targetpid: | |
| if target_thread not in self.apc_targets: | |
| self.apc_targets.add(target_thread) | |
| self.mark_call() | |
| self.ret = True | |
| targetpid_str = self.get_argument(call, "ProcessId") | |
| if targetpid_str and int(apc_routine, 16) != 0: | |
| targetpid = int(targetpid_str) | |
| if pid != targetpid: | |
| if target_thread not in self.apc_targets: | |
| self.apc_targets.add(target_thread) | |
| self.mark_call() | |
| self.ret = True |
| target_thread = self.get_argument(call, "ThreadHandle") | ||
| apc_routine = self.get_argument(call, "pfnAPC") | ||
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There is trailing whitespace on line 83 and an unnecessary blank line on line 85. These should be removed to improve code style and readability.
| target_thread = self.get_argument(call, "ThreadHandle") | |
| apc_routine = self.get_argument(call, "pfnAPC") | |
| target_thread = self.get_argument(call, "ThreadHandle") | |
| apc_routine = self.get_argument(call, "pfnAPC") |
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Pikabot (also other malware like AgentTesla etc.)
