Suspicious VBScript Dropped to Startup Folder (via file_event)

ATT&CK techniques

Persistence → Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1547.001Registry Run Keys / Startup Folder
Priv Esc
- T1547.001Registry Run Keys / Startup Folder
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Hive0051 GammaInstall and GammaSteel persistence where a randomly named VBScript launcher is written to the user Startup folder so it executes at every logon. Writing a vbscript file directly under the Start Menu Programs Startup path is uncommon for legitimate software. The behavior provides logon persistence for the loader chain.

Reporting behind it

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Suspicious VBScript Dropped to Startup Folder (via file_event)

Pivot detection · T1547.001 · 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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