Malicious Script Execution from WinRAR Extraction Directory via CVE-2023-38831

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a command interpreter executing a script staged in a WinRAR temporary extraction directory named Rar$DIa. CVE-2023-38831 abuses a filename spoofing flaw so that opening a decoy document triggers execution of an adjacent script from the Rar$ temp path. This yields attacker code execution when the victim merely opens a crafted archive.

Reporting behind it

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Malicious Script Execution from WinRAR Extraction Directory via CVE-2023-38831

Pivot detection · T1204.002 · 9 related

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