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[Rule Tuning] Unusual File Creation - Alternate Data Stream #4712

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May 9, 2025
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[Rule Tuning] Unusual File Creation - Alternate Data Stream #4712

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10 changes: 6 additions & 4 deletions rules/windows/defense_evasion_unusual_ads_file_creation.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2021/01/21"
integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel"]
maturity = "production"
updated_date = "2025/03/20"
updated_date = "2025/05/08"

[transform]
[[transform.osquery]]
Expand Down Expand Up @@ -104,9 +104,9 @@ Attackers can abuse these alternate data streams to hide malicious files, string
- Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector.
- Using the incident response data, update logging and audit policies to improve the mean time to detect (MTTD) and the mean time to respond (MTTR).
"""
risk_score = 47
risk_score = 21
rule_id = "71bccb61-e19b-452f-b104-79a60e546a95"
severity = "medium"
severity = "low"
tags = [
"Domain: Endpoint",
"OS: Windows",
Expand Down Expand Up @@ -146,6 +146,7 @@ file where host.os.type == "windows" and event.type == "creation" and
"?:\\Program Files\\Microsoft Office\\root\\*\\POWERPNT.EXE",
"?:\\Program Files\\Microsoft Office\\root\\*\\WINWORD.EXE",
"?:\\Program Files\\Mozilla Firefox\\firefox.exe",
"?:\\Program Files\\Windows Defender Advanced Threat Protection\\MsSense.exe",
"?:\\Program Files\\Rivet Networks\\SmartByte\\SmartByteNetworkService.exe",
"?:\\Windows\\explorer.exe",
"?:\\Windows\\System32\\DataExchangeHost.exe",
Expand All @@ -156,7 +157,8 @@ file where host.os.type == "windows" and event.type == "creation" and
"?:\\Windows\\System32\\RuntimeBroker.exe",
"?:\\Windows\\System32\\SearchProtocolHost.exe",
"?:\\Windows\\System32\\sihost.exe",
"?:\\windows\\System32\\svchost.exe"
"?:\\windows\\System32\\svchost.exe",
"?:\\Windows\\System32\\WFS.exe"
) and

file.extension :
Expand Down
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