Malicious GPO Logon Script Planted in SYSVOL Group Policy Path

ATT&CK techniques

Priv Esc → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
- T1484.001Group Policy Modification
Defense Evasion
- T1484.001Group Policy Modification
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of a batch or script file inside the Group Policy user logon scripts path which the IcedID to Dagon Locker actor used to abuse a domain GPO for organization wide code execution at logon and this matters because writing a logon script into the Group Policy scripts folder can execute across every affected user and is a powerful domain wide deployment mechanism.

Reporting behind it

Related detections9 linkedT1484.001 — drag to rearrange

Suspicious Logon Script Written to SYSVOL Share via Group Policy (via file_event)

Suspicious Group Policy Client-Side Extension Attribute Modification via Directory Service Change

Suspicious Modification of a Sensitive Group Policy - GPO (via security)

Suspicious Group Policy File System Path Redirection via Directory Service Change

Malicious GPO Permission Abuse via SharpGPOAbuse

Suspicious Executable Launched from SYSVOL Share

Malicious SharpGPOAbuse GPO Modification Tool from Public Directory

Suspicious Permissions Changed on a Group Policy - GPO (via security)

Suspicious Executable Launched from Domain Netlogon Share (via process_creation)

Malicious GPO Logon Script Planted in SYSVOL Group Policy Path

Pivot detection · T1484.001 · 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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