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UNC6357 is a financially motivated threat cluster associated with ransomware deployment. The cluster has been observed exploiting Microsoft SharePoint Server vulnerabilities, including the ToolShell exploit chain involving CVE-2025-53770 and CVE-2025-53771, to gain initial access and deploy LOCKBIT.WARLOCK ransomware. High-confidence reporting supports UNC6357 as an intrusion set focused on monetization through ransomware operations. Publicly available information in this context does not establish additional aliases, geographic origin, victim-country concentration, or broader victim-sector specialization with high confidence.
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3 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
2 CVEs this actor has used in observed campaigns. 2 of them exploited in the wild.
CVE-2025-53770, a deserialization vulnerability in Microsoft SharePoint Server, could be chained with CVE-2025-53771 in an exploit known as ToolShell. At least two clusters exploited it as a zero-day, and three more did so after patches shipped in late July. The financially motivated cluster UNC6357 used the SharePoint vulnerabilities to deploy LOCKBIT.WARLOCK ransomware.
CVE-2025-53770, a deserialization vulnerability in Microsoft SharePoint Server, could be chained with CVE-2025-53771 in an exploit known as ToolShell. At least two clusters exploited it as a zero-day, and three more did so after patches shipped in late July. The financially motivated cluster UNC6357 used the SharePoint vulnerabilities to deploy LOCKBIT.WARLOCK ransomware.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.