Threadlinqs IntelligenceStart free

ATT&CK techniqueLateral Movement

T1550.004 Web Session Cookie

Lateral MovementEnterpriseSub-technique

As of 2026-10-05, T1550.004 (Web Session Cookie) appears in 50 tracked threats, first reported 2025-10-13 and most recently 2026-10-04, with linked actors including Storm-2755, APT28, Cavern Manticore; it most often appears alongside T1539 (Steal Web Session Cookie).

Tracked threats
5020 critical, 26 high, 4 medium
First seen
2025-10-13
Last seen
2026-10-04
Threat actors
14In the threats using it
Detection rules
146Blue tier and above

Data as of:

Activity timeline

T1550.004 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-07 with 13 reports, and 49 of the 50 threats were reported in the twelve months to 2026-10.

How adversaries use it

T1550.004 Web Session Cookie is catalogued by MITRE ATT&CK under the Lateral Movement tactic in the Enterprise matrix, as a sub-technique of T1550 Use Alternate Authentication Material. Threadlinqs maps 50 of 2623 tracked threats (1.9%) to it; by severity that is 20 critical, 26 high, 4 medium.

Threats that use T1550.004 most often also use T1539 Steal Web Session Cookie (31 threats), T1528 Steal Application Access Token (22 threats), T1078.004 Cloud Accounts (21 threats), T1190 Exploit Public-Facing Application (20 threats), T1071.001 Web Protocols (19 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.

14 tracked threat actors appear in the threats that use T1550.004; the most frequent are Storm-2755 (2), APT28 (1), Cavern Manticore (1), FortiBleed operator (1), Hacktron AI (1).

Mitigations

MITRE ATT&CK lists 1 mitigation for T1550.004.

Data sources

Telemetry that can reveal T1550.004, per MITRE ATT&CK.

  • Application Log — Application Log Content
  • Web Credential — Web Credential Usage

Threat actors using it

Tracked threats

The 30 most recent of 50 tracked threats that use T1550.004.

Detection coverage

Threadlinqs maintains 146 detection rules mapped to T1550.004 (SPL 63, KQL 49, Sigma 34). Rule content is available to Blue tier accounts and above; this page shows counts only.

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

Parent technique

T1550 Use Alternate Authentication Material — 207 tracked threats at the technique level.