# T1550.004 Web Session Cookie > 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:** 50 (20 critical, 26 high, 4 medium) - **First seen:** 2025-10-13 - **Last seen:** 2026-10-04 - **Threat actors:** 14 - **Detection rules:** 146 (counts only; Blue tier and above) ## Key facts - **ID:** T1550.004 - **Framework:** MITRE ATT&CK - **Tactics:** Lateral Movement - **Matrix:** Enterprise - **Parent:** T1550 - **Data as of:** 2026-10-05 - **MITRE:** https://attack.mitre.org/techniques/T1550/004/ ## Activity timeline T1550.004 first appeared in tracked threats on 2025-10-13 and was most recently reported on 2026-10-04. 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](https://intel.threadlinqs.com/technique/T1550). 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](https://intel.threadlinqs.com/technique/T1539) (31 threats), [T1528 Steal Application Access Token](https://intel.threadlinqs.com/technique/T1528) (22 threats), [T1078.004 Cloud Accounts](https://intel.threadlinqs.com/technique/T1078.004) (21 threats), [T1190 Exploit Public-Facing Application](https://intel.threadlinqs.com/technique/T1190) (20 threats), [T1071.001 Web Protocols](https://intel.threadlinqs.com/technique/T1071.001) (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](https://intel.threadlinqs.com/actor/Storm-2755) (2), [APT28](https://intel.threadlinqs.com/actor/APT28) (1), [Cavern Manticore](https://intel.threadlinqs.com/actor/Cavern%20Manticore) (1), [FortiBleed operator](https://intel.threadlinqs.com/actor/FortiBleed%20operator) (1), [Hacktron AI](https://intel.threadlinqs.com/actor/Hacktron%20AI) (1). ## Mitigations MITRE ATT&CK lists 1 mitigation for T1550.004. - [M1054 Software Configuration](https://attack.mitre.org/mitigations/M1054/) ## 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 - [Storm-2755](https://intel.threadlinqs.com/actor/Storm-2755) — 2 - [APT28](https://intel.threadlinqs.com/actor/APT28) — 1 - [Cavern Manticore](https://intel.threadlinqs.com/actor/Cavern%20Manticore) — 1 - [FortiBleed operator](https://intel.threadlinqs.com/actor/FortiBleed%20operator) — 1 - [Hacktron AI](https://intel.threadlinqs.com/actor/Hacktron%20AI) — 1 - [Kali365](https://intel.threadlinqs.com/actor/Kali365) — 1 - [Kali365 PhaaS operators](https://intel.threadlinqs.com/actor/Kali365%20PhaaS%20operators) — 1 - [ShinyHunters](https://intel.threadlinqs.com/actor/ShinyHunters) — 1 - [Storm-1167](https://intel.threadlinqs.com/actor/Storm-1167) — 1 - [Storm-2372](https://intel.threadlinqs.com/actor/Storm-2372) — 1 - [Storm-2945](https://intel.threadlinqs.com/actor/Storm-2945) — 1 - [TheHatman](https://intel.threadlinqs.com/actor/TheHatman) — 1 ## Tracked threats The 30 most recent of 50 tracked threats that use T1550.004. - [China-Aligned TA419 Targets U.S. AI Policy Experts With Microsoft AitM Phishing (Frameless BitB)](https://intel.threadlinqs.com/threat/TL-2026-2884) — high — 2026-10-04 - [Rejetto HTTP File Server (HFS) 3.x session forgery via predictable Math.random() signing key leads to…](https://intel.threadlinqs.com/threat/TL-2026-2865) — critical — 2026-10-03 - [Forgeable Session Cookie (Hard-Coded HMAC Secret) in Yard Management System Bypasses Entra ID MFA and…](https://intel.threadlinqs.com/threat/TL-2026-2892) — high — 2026-10-02 - [CISA adds two Zammad vulnerabilities to KEV: CVE-2026-102489 (session fixation to RCE) and CVE-2026-102490…](https://intel.threadlinqs.com/threat/TL-2026-2843) — critical — 2026-10-02 - [Infostealer-Stolen AI Service Logins Expose 80,000+ Corporate Domains (Shadow AI to LLMjacking)](https://intel.threadlinqs.com/threat/TL-2026-2757) — high — 2026-09-28 - [Infostealers Target Corporate AI Accounts, Sessions and API Keys (LLMjacking Risk)](https://intel.threadlinqs.com/threat/TL-2026-2752) — high — 2026-09-28 - [The Infostealer Incursion: Stolen Credentials Breach Cloud, Code, and AI Environments](https://intel.threadlinqs.com/threat/TL-2026-2687) — high — 2026-09-27 - [CISA Adds Actively Exploited WSO2 API Manager and Adobe Commerce Flaws to KEV Catalog, Warns on SharePoint…](https://intel.threadlinqs.com/threat/TL-2026-2680) — critical — 2026-09-25 - [CISA KEV Additions (2026-09-24): WSO2 JWT Authentication Bypass (CVE-2026-5430, CVSS 10.0) and Adobe…](https://intel.threadlinqs.com/threat/TL-2026-2640) — critical — 2026-09-24 - [AI-Driven Exploit Chain Against OpenAI Community Forum via libheif Flaw (CVE-2026-32882)](https://intel.threadlinqs.com/threat/TL-2026-2558) — high — 2026-09-18 - [BigBear 2.0 Evilginx2 Phishing-as-a-Service Campaign Targeting Microsoft 365 with MFA Bypass](https://intel.threadlinqs.com/threat/TL-2026-2374) — critical — 2026-09-07 - [Commodity Infostealers Hijack Authenticated Claude Sessions to Drain Usage and Payment Methods](https://intel.threadlinqs.com/threat/TL-2026-2257) — medium — 2026-08-31 - [Anthropic Locks Out Claude Users After Commodity Infostealers (Vidar, LummaC2, StealC, RedLine, Acreed…](https://intel.threadlinqs.com/threat/TL-2026-2253) — medium — 2026-08-31 - [Mirage2FA Phishing-as-a-Service Surge Hits 4,532 US and EU Organizations, Abusing Microsoft 365 Login Flows](https://intel.threadlinqs.com/threat/TL-2026-2140) — high — 2026-08-25 - [Insider Threat Landscape: Dark Web Recruitment & Access Broker Trends — July 2026](https://intel.threadlinqs.com/threat/TL-2026-2078) — medium — 2026-08-20 - [Autonomous AI Agent Orchestration Powers Machine-Speed Social Engineering Attack Chains](https://intel.threadlinqs.com/threat/TL-2026-2050) — high — 2026-08-17 - [Azure Credential Theft Campaign Exposes Millions of Enterprise Records at McDonald's, Vodafone, TCS](https://intel.threadlinqs.com/threat/TL-2026-2028) — high — 2026-08-16 - [Claude in Chrome Prompt Injection Steals Gmail Codes to Hijack Slack, X, and Claude.ai Accounts](https://intel.threadlinqs.com/threat/TL-2026-1953) — high — 2026-08-09 - [Metabase Zero-Day SQL Injection (GHSA-vwf4-m7j8-wcjf) Exploited In the Wild for Admin Access](https://intel.threadlinqs.com/threat/TL-2026-1946) — critical — 2026-08-08 - [Metabase Zero-Day (GHSA-vwf4-m7j8-wcjf) Exploited in the Wild for Unauthenticated Admin Access](https://intel.threadlinqs.com/threat/TL-2026-1940) — critical — 2026-08-08 - [Unauthenticated Metabase SQL Injection Zero-Day (GHSA-vwf4-m7j8-wcjf) Exploited to Steal Framework and Tally…](https://intel.threadlinqs.com/threat/TL-2026-1937) — critical — 2026-08-07 - [Microsoft 365 AitM Phishing Campaign Hijacks Sessions via Residential Proxies to Harvest Payroll and Finance…](https://intel.threadlinqs.com/threat/TL-2026-1930) — high — 2026-08-07 - [CaptiveCrunch: Storm-2945 (Midnight Blizzard sub-cluster) Hijacks Hotel Wi-Fi Captive Portals to Deliver…](https://intel.threadlinqs.com/threat/TL-2026-1808) — high — 2026-07-31 - [AiTM Phishing Becomes Top Initial Access Vector for Law Firms: Tycoon2FA, ClickFix/NetSupport RAT, Teams…](https://intel.threadlinqs.com/threat/TL-2026-1777) — high — 2026-07-30 - [CVE-2026-66066 "KindaRails2Shell": Critical Ruby on Rails Active Storage Flaw Allows Unauthenticated…](https://intel.threadlinqs.com/threat/TL-2026-1755) — critical — 2026-07-29 - [CVE-2026-11374: Predictable SSO Ticket Generation Enables Unauthenticated Account Takeover in ManageEngine…](https://intel.threadlinqs.com/threat/TL-2026-1627) — critical — 2026-07-22 - ["The Procurement Trap": AiTM Phishing-as-a-Service Campaign (EvilProxy, FlowerStorm/Storm-1167, Kali365)…](https://intel.threadlinqs.com/threat/TL-2026-1593) — high — 2026-07-21 - [HOLLOWGRAPH: .NET NativeAOT Malware Abusing Microsoft Graph API and M365 Calendar Events for C2, Linked to…](https://intel.threadlinqs.com/threat/TL-2026-1553) — high — 2026-07-20 - [Operation Fake KickOff — Attackers Abuse Recruiters and SaaS to Harvest Corporate Google Workspace Credentials](https://intel.threadlinqs.com/threat/TL-2026-2395) — high — 2026-07-15 - [Microsoft July 2026 Patch Tuesday: Record 622 Flaws Fixed, Two Zero-Days Under Active Exploitation…](https://intel.threadlinqs.com/threat/TL-2026-1334) — critical — 2026-07-14 ## Related CVEs CVEs referenced by the tracked threats that use T1550.004, most frequent first. - [CVE-2025-27152](https://intel.threadlinqs.com/cve/CVE-2025-27152) - [CVE-2026-5430](https://intel.threadlinqs.com/cve/CVE-2026-5430) - [CVE-2008-4128](https://intel.threadlinqs.com/cve/CVE-2008-4128) - [CVE-2023-7028](https://intel.threadlinqs.com/cve/CVE-2023-7028) - [CVE-2025-49113](https://intel.threadlinqs.com/cve/CVE-2025-49113) - [CVE-2025-68461](https://intel.threadlinqs.com/cve/CVE-2025-68461) - [CVE-2026-11374](https://intel.threadlinqs.com/cve/CVE-2026-11374) - [CVE-2026-32201](https://intel.threadlinqs.com/cve/CVE-2026-32201) - [CVE-2026-40372](https://intel.threadlinqs.com/cve/CVE-2026-40372) - [CVE-2026-41940](https://intel.threadlinqs.com/cve/CVE-2026-41940) - [CVE-2026-44748](https://intel.threadlinqs.com/cve/CVE-2026-44748) - [CVE-2026-45659](https://intel.threadlinqs.com/cve/CVE-2026-45659) - [CVE-2026-50522](https://intel.threadlinqs.com/cve/CVE-2026-50522) - [CVE-2026-50661](https://intel.threadlinqs.com/cve/CVE-2026-50661) - [CVE-2026-55040](https://intel.threadlinqs.com/cve/CVE-2026-55040) - [CVE-2026-56155](https://intel.threadlinqs.com/cve/CVE-2026-56155) - [CVE-2026-56164](https://intel.threadlinqs.com/cve/CVE-2026-56164) - [CVE-2026-57092](https://intel.threadlinqs.com/cve/CVE-2026-57092) - [CVE-2026-58644](https://intel.threadlinqs.com/cve/CVE-2026-58644) - [CVE-2026-65660](https://intel.threadlinqs.com/cve/CVE-2026-65660) - [CVE-2026-67279](https://intel.threadlinqs.com/cve/CVE-2026-67279) - [CVE-2026-8451](https://intel.threadlinqs.com/cve/CVE-2026-8451) ## 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: https://threadlinqs.com/pricing ## Parent technique [T1550 Use Alternate Authentication Material](https://intel.threadlinqs.com/technique/T1550) — 207 tracked threats at the technique level. ## Links - Canonical page: https://intel.threadlinqs.com/technique/T1550.004 - All techniques: https://intel.threadlinqs.com/techniques - Full detection coverage and IOCs: https://intel.threadlinqs.com/mcp (Purple tier)