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[Rule Tuning] Windows misc Rule Tuning #4298

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Merged
merged 2 commits into from
Jan 2, 2025
Merged

[Rule Tuning] Windows misc Rule Tuning #4298

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[Rule Tuning] Windows misc Rule Tuning
w0rk3r Dec 12, 2024
0dba4b5
Merge branch 'main' into rt_0
w0rk3r Jan 2, 2025
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10 changes: 8 additions & 2 deletions rules/windows/defense_evasion_amsi_bypass_dllhijack.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ integration = ["windows", "endpoint", "sentinel_one_cloud_funnel", "m365_defende
maturity = "production"
min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
min_stack_version = "8.14.0"
updated_date = "2024/10/15"
updated_date = "2024/12/12"

[transform]
[[transform.osquery]]
Expand Down Expand Up @@ -114,12 +114,15 @@ query = '''
file where host.os.type == "windows" and event.type != "deletion" and file.path != null and
file.name : ("amsi.dll", "amsi") and
not file.path : (
"?:\\$SysReset\\CloudImage\\Package_for_RollupFix*",
"?:\\Windows\\system32\\amsi.dll",
"?:\\Windows\\Syswow64\\amsi.dll",
"?:\\$WINDOWS.~BT\\DUImageSandbox\\*",
"?:\\$WINDOWS.~BT\\NewOS\\Windows\\WinSXS\\*",
"?:\\$WINDOWS.~BT\\NewOS\\Windows\\servicing\\LCU\\*",
"?:\\$WINDOWS.~BT\\Work\\*\\*",
"?:\\$WINDOWS.~BT\\Store\\Offline\\File\\C$\\Windows\\SoftwareDistribution\\Download.bak\\*",
"?:\\Windows\\CbsTemp\\*\\f\\amsi.dll",
"?:\\Windows\\SoftwareDistribution\\Download\\*",
"?:\\Windows\\WinSxS\\amd64_microsoft-antimalware-scan-interface_*\\amsi.dll"
) and
Expand All @@ -129,7 +132,10 @@ file where host.os.type == "windows" and event.type != "deletion" and file.path
file.path : (
"\\Device\\HarddiskVolume??\\Windows\\system32\\amsi.dll",
"\\Device\\HarddiskVolume??\\Windows\\syswow64\\amsi.dll",
"\\Device\\HarddiskVolume??\\Windows\\WinSxS\\*\\amsi.dll"
"\\Device\\HarddiskVolume??\\Windows\\WinSxS\\*\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\WinSxS\\*\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\system32\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\syswow64\\amsi.dll"
)
)
'''
Expand Down
11 changes: 10 additions & 1 deletion rules/windows/lateral_movement_execution_via_file_shares_sequence.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2020/11/03"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/09/23"
updated_date = "2024/12/12"

[transform]
[[transform.osquery]]
Expand Down Expand Up @@ -148,6 +148,15 @@ sequence with maxspan=1m
(
process.executable : "?:\\ProgramData\\Sophos\\AutoUpdate\\Cache\\sophos_autoupdate1.dir\\SophosUpdate.exe" and
process.code_signature.trusted == true and process.code_signature.subject_name : "Sophos Ltd"
) or
/* Elastic processes */
(
process.executable : (
"?:\\Program Files\\Elastic\\Agent\\data\\elastic-agent-*\\components\\previous\\elastic-endpoint.exe",
"?:\\Program Files\\Elastic\\Agent\\data\\elastic-agent-*\\elastic-agent.exe",
"?:\\Program Files\\Elastic\\Agent\\data\\elastic-agent-*\\components\\agentbeat.exe"
) and
process.code_signature.trusted == true and process.code_signature.subject_name : "Elasticsearch, Inc."
)
)
] by host.id, process.executable
Expand Down
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