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ATT&CK techniqueExecution

T1203 Exploitation for Client Execution

ExecutionEnterprise

As of 2026-10-05, T1203 (Exploitation for Client Execution) appears in 363 tracked threats, first reported 2026-01-29 and most recently 2026-10-02, with linked actors including APT28, Forest Blizzard, BlueDelta; it most often appears alongside T1190 (Exploit Public-Facing Application).

Tracked threats
363197 critical, 137 high, 22 medium
First seen
2026-01-29
Last seen
2026-10-02
Threat actors
60In the threats using it
Detection rules
530Blue tier and above

Data as of:

Activity timeline

T1203 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-07 with 135 reports, and 363 of the 363 threats were reported in the twelve months to 2026-10.

How adversaries use it

T1203 Exploitation for Client Execution is catalogued by MITRE ATT&CK under the Execution tactic in the Enterprise matrix. Threadlinqs maps 363 of 2623 tracked threats (13.8%) to it; by severity that is 197 critical, 137 high, 22 medium.

Threats that use T1203 most often also use T1190 Exploit Public-Facing Application (234 threats), T1068 Exploitation for Privilege Escalation (228 threats), T1082 System Information Discovery (207 threats), T1005 Data from Local System (204 threats), T1059 Command and Scripting Interpreter (192 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.

60 tracked threat actors appear in the threats that use T1203; the most frequent are APT28 (9), Forest Blizzard (8), BlueDelta (6), APT38 (4), Andariel (4).

Mitigations

MITRE ATT&CK lists 3 mitigations for T1203.

Data sources

Telemetry that can reveal T1203, per MITRE ATT&CK.

  • Application Log — Application Log Content
  • File — File Modification
  • Network Traffic — Network Traffic Flow
  • Process — Process Creation

Threat actors using it

Tracked threats

The 30 most recent of 363 tracked threats that use T1203.

Detection coverage

Threadlinqs maintains 530 detection rules mapped to T1203 (SPL 199, KQL 166, Sigma 165). Rule content is available to Blue tier accounts and above; this page shows counts only.

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