Malicious LOLBin Spawned by Outlook via MonikerLink CVE-2024-21413

ATT&CK techniques

Initial Access → Defense Evasion

Recon
Resource Dev
Initial Access
- T1566.002Spearphishing Link
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.005Mshta
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Microsoft Outlook spawning script interpreters or living off the land binaries such as mshta which is a hallmark of the MonikerLink CVE-2024-21413 exploitation chain. Successful exploitation lets an attacker bypass the Protected View warning and achieve code execution from a crafted email which makes any such child process highly suspicious.

Reporting behind it

Related detections9 linkedT1218.005 — drag to rearrange

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Suspicious mshta Launched from Explorer via ClickFix Run Dialog (via process_creation)

Malicious LOLBin Spawned by Outlook via MonikerLink CVE-2024-21413

Pivot detection · T1218.005 · 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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