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Merged
merged 6 commits into from
Aug 28, 2025
Merged

[Rule Tuning] Windows 3rd Party EDR Compatibility - Part 1 #5016

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8928c2a
[Rule Tuning] Windows 3rd Party EDR Compatibility - Part 1
w0rk3r Aug 27, 2025
2f795e8
Update defense_evasion_amsi_bypass_dllhijack.toml
w0rk3r Aug 27, 2025
47df811
Update command_and_control_outlook_home_page.toml
Samirbous Aug 28, 2025
c495b64
Update command_and_control_outlook_home_page.toml
Samirbous Aug 28, 2025
eef55eb
Update defense_evasion_amsi_bypass_dllhijack.toml
w0rk3r Aug 28, 2025
0336944
Update rules/windows/command_and_control_port_forwarding_added_regist…
w0rk3r Aug 28, 2025
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12 changes: 7 additions & 5 deletions rules/windows/command_and_control_outlook_home_page.toml
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
[metadata]
creation_date = "2024/08/01"
integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel"]
integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel", "crowdstrike"]
maturity = "production"
updated_date = "2025/06/12"
updated_date = "2025/08/26"

[rule]
author = ["Elastic"]
Expand All @@ -18,6 +18,7 @@ index = [
"endgame-*",
"logs-m365_defender.event-*",
"logs-sentinel_one_cloud_funnel.*",
"logs-crowdstrike.fdr*",
]
language = "eql"
license = "Elastic License v2"
Expand Down Expand Up @@ -60,9 +61,9 @@ references = [
"https://cloud.google.com/blog/topics/threat-intelligence/breaking-the-rules-tough-outlook-for-home-page-attacks/",
"https://github.com/trustedsec/specula",
]
risk_score = 47
risk_score = 73
rule_id = "ac5a2759-5c34-440a-b0c4-51fe674611d6"
severity = "medium"
severity = "high"
tags = [
"Domain: Endpoint",
"OS: Windows",
Expand All @@ -75,6 +76,7 @@ tags = [
"Data Source: Microsoft Defender for Endpoint",
"Data Source: SentinelOne",
"Resources: Investigation Guide",
"Data Source: Crowdstrike",
]
timestamp_override = "event.ingested"
type = "eql"
Expand All @@ -84,7 +86,7 @@ registry where host.os.type == "windows" and event.action != "deletion" and regi
registry.path : (
"*\\SOFTWARE\\Microsoft\\Office\\*\\Outlook\\Webview\\*",
"*\\SOFTWARE\\Microsoft\\Office\\*\\Outlook\\Today\\*"
) and registry.data.strings : "*://*"
) and registry.data.strings : ("*://*", "*http*")
'''


Expand Down
13 changes: 6 additions & 7 deletions rules/windows/command_and_control_port_forwarding_added_registry.toml
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
[metadata]
creation_date = "2020/11/25"
integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender"]
integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender", "crowdstrike"]
maturity = "production"
updated_date = "2025/03/20"
updated_date = "2025/08/26"

[rule]
author = ["Elastic"]
Expand All @@ -18,6 +18,7 @@ index = [
"endgame-*",
"logs-sentinel_one_cloud_funnel.*",
"logs-m365_defender.event-*",
"logs-crowdstrike.fdr*",
]
language = "eql"
license = "Elastic License v2"
Expand Down Expand Up @@ -81,16 +82,14 @@ tags = [
"Data Source: Sysmon",
"Data Source: SentinelOne",
"Data Source: Microsoft Defender for Endpoint",
"Data Source: Crowdstrike",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
registry where host.os.type == "windows" and registry.path : (
"HKLM\\SYSTEM\\*ControlSet*\\Services\\PortProxy\\v4tov4\\*",
"\\REGISTRY\\MACHINE\\SYSTEM\\*ControlSet*\\Services\\PortProxy\\v4tov4\\*",
"MACHINE\\SYSTEM\\*ControlSet*\\Services\\PortProxy\\v4tov4\\*"
)
registry where host.os.type == "windows" and event.type == "change" and
registry.path : "*\\SYSTEM\\*ControlSet*\\Services\\PortProxy\\v4tov4\\*" and registry.data.strings != null
'''


Expand Down
6 changes: 4 additions & 2 deletions rules/windows/credential_access_mimikatz_memssp_default_logs.toml
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
[metadata]
creation_date = "2020/08/31"
integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender"]
integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender", "crowdstrike"]
maturity = "production"
updated_date = "2025/03/20"
updated_date = "2025/08/26"

[rule]
author = ["Elastic"]
Expand All @@ -15,6 +15,7 @@ index = [
"endgame-*",
"logs-sentinel_one_cloud_funnel.*",
"logs-m365_defender.event-*",
"logs-crowdstrike.fdr*",
]
language = "eql"
license = "Elastic License v2"
Expand Down Expand Up @@ -83,6 +84,7 @@ tags = [
"Data Source: Sysmon",
"Data Source: SentinelOne",
"Data Source: Microsoft Defender for Endpoint",
"Data Source: Crowdstrike",
]
timestamp_override = "event.ingested"
type = "eql"
Expand Down
49 changes: 25 additions & 24 deletions rules/windows/defense_evasion_amsi_bypass_dllhijack.toml
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
[metadata]
creation_date = "2023/01/17"
integration = ["windows", "endpoint", "sentinel_one_cloud_funnel", "m365_defender"]
integration = ["windows", "endpoint", "sentinel_one_cloud_funnel", "m365_defender", "crowdstrike"]
maturity = "production"
updated_date = "2025/05/05"
updated_date = "2025/08/26"

[transform]
[[transform.osquery]]
Expand Down Expand Up @@ -44,6 +44,7 @@ index = [
"endgame-*",
"logs-sentinel_one_cloud_funnel.*",
"logs-m365_defender.event-*",
"logs-crowdstrike.fdr*",
]
language = "eql"
license = "Elastic License v2"
Expand Down Expand Up @@ -111,38 +112,38 @@ tags = [
"Data Source: Sysmon",
"Data Source: SentinelOne",
"Data Source: Microsoft Defender for Endpoint",
"Data Source: Crowdstrike",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
file where host.os.type == "windows" and event.type != "deletion" and file.path != null and
file.name : ("amsi.dll", "amsi") and
file.name : ("amsi.dll", "amsi") and
event.action != "A process changed a file creation time" and
not file.path : (
"?:\\$SysReset\\CloudImage\\Package_for_RollupFix*",
"?:\\$SysReset\\CloudImage\\Package_for_RollupFix*\\amsi.dll",
"?:\\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.~BT\\*\\amsi.dll",
"?:\\Windows\\CbsTemp\\*\\amsi.dll",
"?:\\Windows\\SoftwareDistribution\\Download\\*",
"?:\\Windows\\WinSxS\\amd64_microsoft-antimalware-scan-interface_*\\amsi.dll"
) and
not
(
process.executable : "C:\\Windows\\System32\\wbengine.exe" and
file.path : (
"\\Device\\HarddiskVolume??\\Windows\\system32\\amsi.dll",
"\\Device\\HarddiskVolume??\\Windows\\syswow64\\amsi.dll",
"\\Device\\HarddiskVolume??\\Windows\\WinSxS\\*\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\WinSxS\\*\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\system32\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\syswow64\\amsi.dll"
)
)
"?:\\Windows\\WinSxS\\*\\amsi.dll",
"?:\\Windows\\servicing\\*\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\WinSxS\\*\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\system32\\amsi.dll",
"\\\\?\\Volume{*}\\Windows\\syswow64\\amsi.dll",

/* Crowdstrike specific exclusion as it uses NT Object paths */
"\\Device\\HarddiskVolume*\\Windows\\system32\\amsi.dll",
"\\Device\\HarddiskVolume*\\Windows\\syswow64\\amsi.dll",
"\\Device\\HarddiskVolume*\\Windows\\WinSxS\\*\\amsi.dll",
"\\Device\\HarddiskVolume*\\$SysReset\\CloudImage\\Package_for_RollupFix*\\amsi.dll",
"\\Device\\HarddiskVolume*\\$WINDOWS.~BT\\*\\amsi.dll",
"\\Device\\HarddiskVolume*\\Windows\\SoftwareDistribution\\Download\\*\\amsi.dll",
"\\Device\\HarddiskVolume*\\Windows\\CbsTemp\\*\\amsi.dll",
"\\Device\\HarddiskVolume*\\Windows\\servicing\\*\\amsi.dll"
)
'''


Expand Down
6 changes: 4 additions & 2 deletions rules/windows/defense_evasion_amsienable_key_mod.toml
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
[metadata]
creation_date = "2021/06/01"
integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel"]
integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel", "crowdstrike"]
maturity = "production"
updated_date = "2025/03/20"
updated_date = "2025/08/26"

[rule]
author = ["Elastic"]
Expand All @@ -18,6 +18,7 @@ index = [
"endgame-*",
"logs-m365_defender.event-*",
"logs-sentinel_one_cloud_funnel.*",
"logs-crowdstrike.fdr*",
]
language = "eql"
license = "Elastic License v2"
Expand Down Expand Up @@ -90,6 +91,7 @@ tags = [
"Data Source: Sysmon",
"Data Source: Microsoft Defender for Endpoint",
"Data Source: SentinelOne",
"Data Source: Crowdstrike",
]
timestamp_override = "event.ingested"
type = "eql"
Expand Down
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