Suspicious Chrome Browser Process Spawned by Outlook Indicating Sandbox Escape

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1203Exploitation for Client Execution
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the Outlook process spawning a Chrome browser process, an anomaly tied to the ForumTroll exploitation of CVE-2025-2783. The attackers abused an Outlook link to launch Chrome and escape its sandbox, loading a malicious DLL for follow-on execution. Outlook does not normally parent a Chrome process directly, so this parent-child relationship strongly suggests exploitation of the browser via email delivery.

Reporting behind it

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Suspicious Chrome Browser Process Spawned by Outlook Indicating Sandbox Escape

Pivot detection · T1204.002 · 9 related

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