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STAC4365 is a ransomware affiliate assessed with high confidence to operate within the Qilin ransomware-as-a-service ecosystem. Active phishing activity associated with the cluster dates to at least late 2022. In January 2025, STAC4365 compromised a managed service provider by impersonating ConnectWise ScreenConnect authentication alerts and using an Evilginx adversary-in-the-middle phishing framework to capture administrator credentials, intercept MFA one-time passwords, and steal session cookies. The resulting super-administrator access was used to deploy attacker-controlled remote-management tooling across multiple customer environments. STAC4365 conducted network and user discovery, reset credentials, executed commands remotely using legitimate administrative tooling, collected and compressed data, exfiltrated it, targeted backup infrastructure, modified boot configuration for Safe Mode with networking, and deployed Qilin ransomware. Its operations demonstrate targeted initial access through credential and session theft, followed by lateral movement and double extortion.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
10 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 malware families attributed to this actor across reporting.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
26 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Conducted a ScreenConnect supply-chain compromise using evilginx adversary-in-the-middle phishing against managed-service-provider administrators, intercepting credentials and MFA TOTP codes to gain super-administrator access to downstream customer environments.
Named activity cluster associated with phishing infrastructure spoofing ScreenConnect since late 2022, using evilginx and tracking-link gating to harvest credentials and MFA tokens and enable downstream ransomware deployment.
Qilin affiliate group reported to use adversary-in-the-middle phishing to steal credentials (MFA bypass via session capture implied).
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.