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ATT&CK techniqueDefense Impairment

T1601 Modify System Image

Defense ImpairmentEnterprise

As of 2026-10-05, T1601 (Modify System Image) appears in 32 tracked threats, first reported 2026-02-25 and most recently 2026-09-24, with linked actors including Static Tundra, FSB Center 16, UAT-8616; it most often appears alongside T1059 (Command and Scripting Interpreter).

Tracked threats
3214 critical, 16 high, 1 medium
First seen
2026-02-25
Last seen
2026-09-24
Threat actors
7In the threats using it
Detection rules
30Blue tier and above

Data as of:

Activity timeline

T1601 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-07 with 11 reports, and 32 of the 32 threats were reported in the twelve months to 2026-09.

How adversaries use it

T1601 Modify System Image is catalogued by MITRE ATT&CK under the Defense Impairment tactic in the Enterprise matrix. Threadlinqs maps 32 of 2623 tracked threats (1.2%) to it; by severity that is 14 critical, 16 high, 1 medium.

Threats that use T1601 most often also use T1059 Command and Scripting Interpreter (21 threats), T1190 Exploit Public-Facing Application (20 threats), T1552 Unsecured Credentials (17 threats), T1068 Exploitation for Privilege Escalation (16 threats), T1041 Exfiltration Over C2 Channel (15 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.

7 tracked threat actors appear in the threats that use T1601; the most frequent are Static Tundra (4), FSB Center 16 (2), UAT-8616 (2), APT28 (1), Chaotic Eclipse (1).

Mitigations

MITRE ATT&CK lists 6 mitigations for T1601.

Data sources

Telemetry that can reveal T1601, per MITRE ATT&CK.

  • File — File Modification

Threat actors using it

Tracked threats

The 30 most recent of 32 tracked threats that use T1601.

Detection coverage

Threadlinqs maintains 30 detection rules mapped to T1601 (SPL 10, KQL 9, Sigma 9, other 2). Rule content is available to Blue tier accounts and above; this page shows counts only.

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

Sub-techniques