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improve debug detection features #721

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merged 1 commit into from
Mar 14, 2023
Merged

improve debug detection features #721

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3 changes: 3 additions & 0 deletions anti-analysis/anti-debugging/debugger-detection/check-for-debugger-via-api.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,9 @@ rule:
- al-khaser_x86.exe_:0x420000
features:
- or:
# We're not including kernel32.IsDebuggerPresent here because some exception handlers and other compiler-inserted
# code may add calls to it, especially in debug builds. So, likely even with pretty good library code detection
# this feature could result in many false positives.
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see #100 (comment)

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nice!

- api: kernel32.CheckRemoteDebuggerPresent
- api: WUDFPlatform.WudfIsAnyDebuggerPresent
- api: WUDFPlatform.WudfIsKernelDebuggerPresent
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6 changes: 5 additions & 1 deletion host-interaction/process/list/enumerate-processes-via-ntquerysysteminformation.yml
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Expand Up @@ -13,4 +13,8 @@ rule:
features:
- and:
- number: 0x5 = SYSTEM_PROCESS_INFORMATION
- api: NtQuerySystemInformation
- or:
- api: NtQuerySystemInformation
- api: NtQuerySystemInformationEx
- api: ZwQuerySystemInformation
- api: ZwQuerySystemInformationEx
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see #720

8 changes: 6 additions & 2 deletions nursery/check-for-process-debug-object.yml
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Expand Up @@ -11,8 +11,12 @@ rule:
- https://github.com/LordNoteworthy/al-khaser/blob/master/al-khaser/AntiDebug/NtQueryInformationProcess_ProcessDebugObject.cpp
features:
- and:
- api: kernel32.GetCurrentProcess
- or:
- api: kernel32.GetCurrentProcess
- api: System.Diagnostics.Process::GetCurrentProcess
- basic block:
- and:
- api: NtQueryInformationProcess
- or:
- api: NtQueryInformationProcess
- api: ZwQueryInformationProcess
- number: 0x1E = ProcessDebugObjectHandle
8 changes: 6 additions & 2 deletions nursery/check-systemkerneldebuggerinformation.yml
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Expand Up @@ -6,10 +6,14 @@ rule:
- [email protected]
scope: basic block
mbc:
- Anti-Behavioral Analysis::Debugger Detection::NtQueryInformationProcess [B0001.012]
- Anti-Behavioral Analysis::Debugger Detection [B0001]
references:
- https://github.com/LordNoteworthy/al-khaser/blob/master/al-khaser/AntiDebug/NtQuerySystemInformation_SystemKernelDebuggerInformation.cpp
features:
- and:
- api: NtQueryInformationProcess
- or:
- api: NtQuerySystemInformation
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fix: ...SystemInformation (see al-khaser and Anti-DebugNet source)

- api: NtQuerySystemInformationEx
- api: ZwQuerySystemInformation
- api: ZwQuerySystemInformationEx
- number: 0x23 = SystemKernelDebuggerInformation