Certutil used to transmit or decode a file

Classification:

attack

Tactic:

TA0011-command-and-control

Technique:

T1105-ingress-tool-transfer

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What happened

The command {{ @process.executable.name }} was executed, potentially to download malicious tools.

Goal

Detect when certutil is used to download a file or decode content.

Strategy

Threat actors are known to utilize tools found natively in a victim’s environment to accomplish their objectives. Certutil, a legitimate Windows binary, has been abused by malicious actors in the past to fetch additional tools and payloads, as well as decode obfuscated payloads to avoid detection.

Triage and response

  1. Identify what is being downloaded or decoded.
  2. If it’s not authorized, isolate the host from the network.
  3. Follow your organization’s internal processes for investigating and remediating compromised systems.

Requires Agent version 7.50.0 or greater.