Suspicious Script Host Execution of Decoy-Named JavaScript Dropper (PS1Bot)

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.005Visual Basic
- T1059.007JavaScript
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the Windows Script Host executing a JavaScript file named to impersonate a document, such as FULL DOCUMENT.js, delivered inside a decoy ZIP archive. PS1Bot uses this dropper to write and run obfuscated VBScript that stages further PowerShell payloads. Script host execution of document-themed .js files indicates malicious delivery.

Reporting behind it

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Suspicious Script Host Execution of Decoy-Named JavaScript Dropper (PS1Bot)

Pivot detection · T1059.005 · 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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