Certutil Download / Decode
highWindowsSingle eventexperimentalsigma.certutil_download_decode · v1.0.0
What it detects
Flags activity matching the SigmaHQ rule “Certutil Download / Decode” — MITRE ATT&CK T1105, Ingress Tool Transfer.
MITRE ATT&CK mapping
- T1105Ingress Tool Transfer· Command and Control
False positives and triage
Converted from Sigma; review before enabling.
The rule
Declarative YAML read by the detection engine — data, never executed. Confidence 70%. Source: rules/sigma/sigma.certutil_download_decode.yaml, licensed under the Detection Rule License 1.1.
id: sigma.certutil_download_decode
version: 1.0.0
status: experimental
severity: high
confidence: 0.7
platforms:
- windows
mitre_techniques:
- T1105
description: Certutil Download / Decode (Sigma sample)
match:
event_category: process
process_path_contains_any:
- \certutil.exe
command_line_contains_any:
- urlcache
- -decode
- -urlcache
false_positive_guidance: Converted from Sigma; review before enabling.
Adapted from the SigmaHQ rule “Certutil Download / Decode”, distributed under the Detection Rule License 1.1. SigmaHQ.
Related detections
Run this rule on your own logs — offline
KIROSEC runs this rule and the rest of the library over Windows, Linux, macOS and cloud audit logs on the analyst's own machine. Every alert links to the events that raised it, and nothing leaves the device.