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[Rule Tuning] Mark some field optional for 3rd party compatibility #5135

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Merged
merged 3 commits into from
Sep 22, 2025
Merged

[Rule Tuning] Mark some field optional for 3rd party compatibility #5135

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5a7b47f
[Rule Tuning] Mark some field optional for 3rd party compatibility
w0rk3r Sep 18, 2025
407da9d
bump
w0rk3r Sep 18, 2025
d6c04e7
Merge branch 'main' into rt_1
w0rk3r Sep 22, 2025
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4 changes: 2 additions & 2 deletions rules/windows/command_and_control_dns_susp_tld.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2025/08/20"
integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "crowdstrike"]
maturity = "production"
updated_date = "2025/09/05"
updated_date = "2025/09/18"

[rule]
author = ["Elastic"]
Expand Down Expand Up @@ -79,7 +79,7 @@ network where host.os.type == "windows" and dns.question.name != null and
"java.exe", "javaw.exe", "*.pif", "*.com", "*.scr") or
(?process.code_signature.trusted == false or ?process.code_signature.exists == false) or
?process.code_signature.subject_name : ("AutoIt Consulting Ltd", "OpenJS Foundation", "Python Software Foundation") or
process.executable : ("?:\\Users\\*.exe", "?:\\ProgramData\\*.exe")
?process.executable : ("?:\\Users\\*.exe", "?:\\ProgramData\\*.exe")
) and
dns.question.name regex """.*\.(top|buzz|xyz|rest|ml|cf|gq|ga|onion|monster|cyou|quest|cc|bar|cfd|click|cam|surf|tk|shop|club|icu|pw|ws|online|fun|life|boats|store|hair|skin|motorcycles|christmas|lol|makeup|mom|bond|beauty|biz|live|work|zip|country|accountant|date|party|science|loan|win|men|faith|review|racing|download|host)"""
'''
Expand Down
4 changes: 2 additions & 2 deletions rules/windows/defense_evasion_regmod_remotemonologue.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2025/04/14"
integration = ["endpoint", "m365_defender", "sentinel_one_cloud_funnel", "windows"]
maturity = "production"
updated_date = "2025/08/08"
updated_date = "2025/09/18"

[rule]
author = ["Elastic"]
Expand Down Expand Up @@ -111,7 +111,7 @@ registry where host.os.type == "windows" and event.action != "deletion" and
"HKLM\\SOFTWARE\\Microsoft\\Office\\ClickToRun\\VREGISTRY_*",
"\\REGISTRY\\MACHINE\\SOFTWARE\\Microsoft\\Office\\ClickToRun\\VREGISTRY_*"
) or
(process.executable : "C:\\windows\\System32\\msiexec.exe" and user.id : "S-1-5-18")
(process.executable : "C:\\windows\\System32\\msiexec.exe" and ?user.id : "S-1-5-18")
)
'''

Expand Down
4 changes: 2 additions & 2 deletions rules/windows/execution_windows_powershell_susp_args.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2024/09/06"
integration = ["endpoint", "windows", "system", "sentinel_one_cloud_funnel", "m365_defender", "crowdstrike"]
maturity = "production"
updated_date = "2025/09/01"
updated_date = "2025/09/18"

[rule]
author = ["Elastic"]
Expand Down Expand Up @@ -85,7 +85,7 @@ process where host.os.type == "windows" and event.type == "start" and
process.name : "powershell.exe" and

not (
user.id == "S-1-5-18" and
?user.id == "S-1-5-18" and
/* Don't apply the user.id exclusion to Sysmon for compatibility */
not event.dataset : ("windows.sysmon_operational", "windows.sysmon")
) and
Expand Down
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