Suspicious Child Process Spawned by WinRAR via Process Creation

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1203Exploitation for Client Execution
- T1204.001Malicious Link
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects WinRAR spawning a command interpreter or script host, the exploitation pattern of CVE-2023-38831 in which a trailing-space filename trick causes WinRAR to execute an attacker .cmd, as leveraged by UAC-0099 against Ukrainian targets. Such child processes indicate archive-borne code execution rather than normal extraction.

Reporting behind it

Related detections9 linkedT1204.001 — drag to rearrange

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

Suspicious Execution From WinRAR Temporary Extraction Path via Command Line (via process_creation)

Malicious Shell Execution via Foomatic-rip Print Filter through CUPS Exploit

Suspicious cscript Execution of JavaScript Spawned by PowerShell

Suspicious Network Connection From CUPS Foomatic-Rip Child Process

Suspicious Child Process Spawned by WinRAR via Process Creation

Pivot detection · T1204.001 · 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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