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ATT&CK techniqueStealth (formerly Defense Evasion)

T1036.007 Double File Extension

Stealth (formerly Defense Evasion)EnterpriseSub-technique

As of 2026-10-05, T1036.007 (Double File Extension) appears in 13 tracked threats, first reported 2026-01-14 and most recently 2026-07-23, with linked actors including APT43, Gamaredon, Kimsuky; it most often appears alongside T1204.002 (Malicious File).

Tracked threats
1312 high, 1 medium
First seen
2026-01-14
Last seen
2026-07-23
Threat actors
6In the threats using it
Detection rules
32Blue tier and above

Data as of:

Activity timeline

T1036.007 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-07 with 8 reports, and 13 of the 13 threats were reported in the twelve months to 2026-07.

How adversaries use it

T1036.007 Double File Extension is catalogued by MITRE ATT&CK under the Stealth (formerly Defense Evasion) tactic in the Enterprise matrix, as a sub-technique of T1036 Masquerading. Threadlinqs maps 13 of 2623 tracked threats (0.5%) to it; by severity that is 12 high, 1 medium.

Threats that use T1036.007 most often also use T1204.002 Malicious File (13 threats), T1071.001 Web Protocols (11 threats), T1027 Obfuscated Files or Information (10 threats), T1082 System Information Discovery (10 threats), T1105 Ingress Tool Transfer (10 threats). These are the techniques an intrusion set tends to chain with it, so they are the natural next places to look when it is observed.

6 tracked threat actors appear in the threats that use T1036.007; the most frequent are APT43 (2), Gamaredon (2), Kimsuky (2), APT29 (1), APT37 (1).

Mitigations

MITRE ATT&CK lists 2 mitigations for T1036.007.

Data sources

Telemetry that can reveal T1036.007, per MITRE ATT&CK.

  • File — File Creation, File Metadata

Threat actors using it

Tracked threats

13 tracked threats use T1036.007.

Detection coverage

Threadlinqs maintains 32 detection rules mapped to T1036.007 (SPL 12, KQL 9, Sigma 11). Rule content is available to Blue tier accounts and above; this page shows counts only.

32 detection rules (SPL/KQL/Sigma) · Blue and above. Compare plans

Parent technique

T1036 Masquerading — 845 tracked threats at the technique level.