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

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1037.003Network Logon Script
Priv Esc
- T1037.003Network Logon Script
- 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 batch or PowerShell logon scripts being written into the domain controller SYSVOL share, a technique used by a Qilin affiliate to push credential harvesting scripts to every endpoint through Group Policy logon script execution. Attackers stage files such as logon.bat and run.bat under SYSVOL to run malicious code at user logon domain wide.

Reporting behind it

Related detections9 linkedT1484.001 — drag to rearrange

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)

Windows Process: GPME Used to Modify Default Domain and Default Domain Controllers GPOs

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

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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