Threadlinqs IntelligenceStart free

ATT&CK techniqueStealth (formerly Defense Evasion)

T1564.008 Email Hiding Rules

Stealth (formerly Defense Evasion)EnterpriseSub-technique

As of 2026-10-05, T1564.008 (Email Hiding Rules) appears in 11 tracked threats, first reported 2026-04-10 and most recently 2026-10-03, with linked actors including Storm-2755, Greatness PhaaS Operators, Kali365; it most often appears alongside T1566.002 (Spearphishing Link).

Tracked threats
1111 high
First seen
2026-04-10
Last seen
2026-10-03
Threat actors
10In the threats using it
Detection rules
31Blue tier and above

Data as of:

Activity timeline

T1564.008 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-08 with 7 reports, and 11 of the 11 threats were reported in the twelve months to 2026-10.

How adversaries use it

T1564.008 Email Hiding Rules is catalogued by MITRE ATT&CK under the Stealth (formerly Defense Evasion) tactic in the Enterprise matrix, as a sub-technique of T1564 Hide Artifacts. Threadlinqs maps 11 of 2623 tracked threats (0.4%) to it; by severity that is 11 high.

Threats that use T1564.008 most often also use T1566.002 Spearphishing Link (10 threats), T1078.004 Cloud Accounts (9 threats), T1114.002 Remote Email Collection (8 threats), T1528 Steal Application Access Token (8 threats), T1087.004 Cloud Account (7 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.

10 tracked threat actors appear in the threats that use T1564.008; the most frequent are Storm-2755 (3), Greatness PhaaS Operators (1), Kali365 (1), Kali365 PhaaS operators (1), Scattered Spider (1).

Mitigations

MITRE ATT&CK lists 1 mitigation for T1564.008.

Data sources

Telemetry that can reveal T1564.008, per MITRE ATT&CK.

  • Application Log — Application Log Content
  • Command — Command Execution
  • File — File Modification

Threat actors using it

Tracked threats

11 tracked threats use T1564.008.

Detection coverage

Threadlinqs maintains 31 detection rules mapped to T1564.008 (SPL 11, KQL 10, Sigma 10). Rule content is available to Blue tier accounts and above; this page shows counts only.

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

Parent technique

T1564 Hide Artifacts — 174 tracked threats at the technique level.