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ATT&CK techniqueInitial AccessPersistence

T1133 External Remote Services

Initial AccessPersistenceEnterprise

As of 2026-10-05, T1133 (External Remote Services) appears in 307 tracked threats, first reported 2026-01-25 and most recently 2026-10-03, with linked actors including Qilin, Static Tundra, LockBit; it most often appears alongside T1190 (Exploit Public-Facing Application).

Tracked threats
307128 critical, 136 high, 37 medium
First seen
2026-01-25
Last seen
2026-10-03
Threat actors
86In the threats using it
Detection rules
416Blue tier and above

Data as of:

Activity timeline

T1133 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-07 with 111 reports, and 307 of the 307 threats were reported in the twelve months to 2026-10.

How adversaries use it

T1133 External Remote Services is catalogued by MITRE ATT&CK under the Initial Access and Persistence tactics in the Enterprise matrix. Threadlinqs maps 307 of 2623 tracked threats (11.7%) to it; by severity that is 128 critical, 136 high, 37 medium.

Threats that use T1133 most often also use T1190 Exploit Public-Facing Application (221 threats), T1078 Valid Accounts (195 threats), T1059 Command and Scripting Interpreter (167 threats), T1685 Disable or Modify Tools (138 threats), T1005 Data from Local System (137 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.

86 tracked threat actors appear in the threats that use T1133; the most frequent are Qilin (10), Static Tundra (8), LockBit (6), Sandworm (6), The Gentlemen (6).

Mitigations

MITRE ATT&CK lists 5 mitigations for T1133.

Data sources

Telemetry that can reveal T1133, per MITRE ATT&CK.

  • Application Log — Application Log Content
  • Logon Session — Logon Session Metadata
  • Network Traffic — Network Connection Creation, Network Traffic Content, Network Traffic Flow

Threat actors using it

Tracked threats

The 30 most recent of 307 tracked threats that use T1133.

Detection coverage

Threadlinqs maintains 416 detection rules mapped to T1133 (SPL 170, KQL 130, Sigma 114, other 2). Rule content is available to Blue tier accounts and above; this page shows counts only.

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