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ATT&CK techniqueExecution

T1559 Inter-Process Communication

ExecutionEnterprise

As of 2026-10-05, T1559 (Inter-Process Communication) appears in 41 tracked threats, first reported 2026-02-02 and most recently 2026-09-28, with linked actors including APT28, Forest Blizzard, APT29; it most often appears alongside T1059 (Command and Scripting Interpreter).

Tracked threats
4112 critical, 26 high, 2 medium
First seen
2026-02-02
Last seen
2026-09-28
Threat actors
15In the threats using it
Detection rules
36Blue tier and above

Data as of:

Activity timeline

T1559 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-02 with 13 reports, and 41 of the 41 threats were reported in the twelve months to 2026-09.

How adversaries use it

T1559 Inter-Process Communication is catalogued by MITRE ATT&CK under the Execution tactic in the Enterprise matrix. Threadlinqs maps 41 of 2623 tracked threats (1.6%) to it; by severity that is 12 critical, 26 high, 2 medium.

Threats that use T1559 most often also use T1059 Command and Scripting Interpreter (30 threats), T1082 System Information Discovery (30 threats), T1041 Exfiltration Over C2 Channel (27 threats), T1005 Data from Local System (26 threats), T1027 Obfuscated Files or Information (26 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.

15 tracked threat actors appear in the threats that use T1559; the most frequent are APT28 (3), Forest Blizzard (3), APT29 (1), APT32 (1), BlackSuit affiliate (1).

Mitigations

MITRE ATT&CK lists 6 mitigations for T1559.

Data sources

Telemetry that can reveal T1559, per MITRE ATT&CK.

  • Module — Module Load
  • Process — Process Access, Process Creation
  • Script — Script Execution

Threat actors using it

Tracked threats

The 30 most recent of 41 tracked threats that use T1559.

Detection coverage

Threadlinqs maintains 36 detection rules mapped to T1559 (SPL 12, KQL 8, Sigma 16). Rule content is available to Blue tier accounts and above; this page shows counts only.

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

Sub-techniques