mandiant / mandiant/capa-rules
dynamic: "create thread bypassing process freeze" FPs
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Description
I'm seeing many FPs for _create thread bypassing process freeze_ for capa dynamic anlaysis of CAPE sandbox, e.g.:
```
NtCreateThreadEx(
ThreadHandle=0x3f8,
ProcessHandle=0xffffffff,
StartAddress=0x100100,
Parameter=0x40,
CreateFlags=0x1,
ThreadId=0x1df8,
ProcessId=0x1a70,
Module="example.exe",
) -> 0x0
```
capa is detecting `0x40` constant passed via _Parameter_ but we only want to match if it is passed via _CreateFlags_.
Contributor guide
Research direction
Start by locating the capa dynamic-analysis rule for “create thread bypassing process freeze” and inspect how the NtCreateThreadEx arguments are matched. Reproduce the shown call, then verify that a match requires 0x40 in CreateFlags rather than Parameter and that the reported false positive no longer matches.
Written by the indexing model from the issue text.
Assessment
- Domain
- security
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100