Suspicious Program Execution From a Mounted ISO or Disk Image (via process_creation)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
- T1553.005Mark-of-the-Web Bypass
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a program launching from a mounted ISO, IMG or VHD volume, the delivery pattern adversaries use to bypass Mark-of-the-Web so downloaded payloads run without SmartScreen or Office protections. Container-file delivery is a recurring initial-access and defense-evasion behavior in the Red Canary Threat Detection Report, favored by loaders arriving through phishing. Detecting execution from a freshly mounted image surfaces the smuggled payload before it detonates.

Reporting behind it

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Suspicious Program Execution From a Mounted ISO or Disk Image (via process_creation)

Pivot detection · T1204.002 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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