Masqueraded Executable With Double Image Extension

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1036.007Double File Extension
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects execution of files carrying a double extension that hides an executable behind an image name such as .jpg.scr, a masquerading trick used by the Phorpiex downloader payloads. Double extensions deceive users and analysts into treating a runnable file as a harmless image.

Reporting behind it

Related detections8 linkedT1036.007 — drag to rearrange

Suspicious Double Extension docx Executable Execution (via process_creation)

Suspicious MSC File with Double Extension (via file_event)

Suspicious MSHTA Execution of Polyglot PDF File Spawned by cmd (via process_creation)

Masquerading Noodlophile Payload Execution via Video File Double Extension (via process_creation)

Suspicious Double Extension PDF Executable via Process Creation

Windows Suspicious Double-Extension Execution via Parent Command Line

Windows File Creation: Suspicious LNK Double-Extension Targeted by Document/Image Prefixes

Windows File Events: Flag Files With Double Extensions (e.g., .docx.exe)

Masqueraded Executable With Double Image Extension

Pivot detection · T1036.007 · 8 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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