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fix(rules): Tune false positives #660

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fix(rules): Tune false positives #660

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5 changes: 3 additions & 2 deletions rules/credential_access_suspicious_access_to_windows_manager_files.yml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name: Suspicious access to Windows Credential Manager files
id: 4ab688f7-94e2-481b-9c7f-c49f3a79a379
version: 1.0.4
version: 1.0.5
description: |
Identifies suspicious processes trying to acquire credentials from the Windows Credential Manager.
labels:
Expand All @@ -25,7 +25,8 @@ condition: >
(
'?:\\Program Files\\*',
'?:\\Program Files(x86)\\*',
'?:\\Windows\\System32\\lsass.exe'
'?:\\Windows\\System32\\lsass.exe',
'?:\\Windows\\system32\\svchost.exe'
)

min-engine-version: 3.0.0
6 changes: 4 additions & 2 deletions rules/defense_evasion_suspicious_access_to_the_hosts_file.yml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name: Suspicious access to the hosts file
id: f7b2c9d3-99e7-41d5-bb4a-6ea1a5f7f9e2
version: 1.1.0
version: 1.1.1
description: >
Identifies suspicious process accessing the Windows hosts file for potential tampering.
Adversaries can hijack the hosts files to block traffic to download/update servers or redirect the
Expand Down Expand Up @@ -65,7 +65,9 @@ condition: >
'?:\\Program Files\\Microsoft VS Code\\Code.exe!GetHandleVerifier',
'?:\\Program Files (x86)\\Microsoft VS Code\\Code.exe!GetHandleVerifier',
'?:\\Program Files\\Google\\Chrome\\*\\chrome.dll!*',
'?:\\Program Files (x86)\\Google\\Chrome\\*\\chrome.dll!*'
'?:\\Program Files (x86)\\Google\\Chrome\\*\\chrome.dll!*',
'?:\\Program Files\\Microsoft\\*\\msedge.dll!*',
'?:\\Program Files (x86)\\Microsoft\\*\\msedge.dll!*'
))
|
action:
Expand Down
8 changes: 5 additions & 3 deletions rules/defense_evasion_suspicious_protected_process_execution.yml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name: Suspicious protected process execution
id: a778295a-02f1-42d9-9c20-78346a7bc2c6
version: 1.0.0
version: 1.1.0
description: |
Identifies unprivileged process spawning a child with protected integrity level. This
indicates an unusual behavior that is often associated with attempts to tamper with or
Expand All @@ -22,11 +22,13 @@ condition: >
sequence
maxspan 1m30s
|spawn_process and
ps.token.integrity_level != 'SYSTEM' and
ps.is_protected = false and
(ps.sid != 'S-1-5-18' or ps.token.integrity_level != 'SYSTEM') and
ps.exe not imatches
(
'?:\\Program Files\\*',
'?:\\Program Files(x86)\\*'
'?:\\Program Files(x86)\\*',
'?:\\WINDOWS\\System32\\smss.exe'
)
| by ps.uuid
|spawn_process and ps.is_protected| by ps.parent.uuid
Expand Down
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