Suspicious Font File Passed as Argument to Script Interpreter via Lua Loader (via process_creation)

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1036.005Match Legitimate Resource Name or Location
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the TTF Trap loader in which a WScript or CScript host launches a bundled Lua or AutoIt interpreter and passes a file with a .ttf extension as the script to execute. Legitimate font files are never executed as interpreter scripts. This masquerade of a loader script as a font is characteristic of the campaign.

Reporting behind it

Related detections9 linkedT1036.005 — drag to rearrange

Malicious Fake Fortinet Patch Infostealer Execution (via process_creation)

Suspicious Masquerading Python Interpreter csshost Executing Script

FortiClient Binary Executed from LocalAppData Compliance Directory (via process_creation)

Masquerading Edge Update Masquerade Executed From AppData (via process_creation)

Suspicious CTFMON Masqueraded Binary Execution (via process_creation)

Suspicious SSH Reverse Tunnel via Renamed plink Utility on Triofox Host

Suspicious TransferLoader Temporary File Creation in Windows Temp (via file_event)

LeakyStealer Persistence via EdgeUpdateCore Run Key Masquerade (via registry_set)

Malicious ZharkBot Execution via Explert Masquerade in Temp via process_creation

Suspicious Font File Passed as Argument to Script Interpreter via Lua Loader (via process_creation)

Pivot detection · T1036.005 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →