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🇨🇳 CN1 malware familyExploits CVEs in the wild

Sheathminer

Also known assheathminer

Sheathminer is a China-linked espionage threat actor identified by Microsoft as also being Violet Typhoon and APT31. Microsoft reported Sheathminer as one of three distinct China-linked actors exploiting the Microsoft SharePoint ToolShell zero-day vulnerability CVE-2025-53770 in July 2025, alongside Budworm (Linen Typhoon, APT27) and Storm-2603. The reporting specifically characterizes Sheathminer/Violet Typhoon as a Chinese espionage group. The provided content does not attribute the broader post-exploitation toolset or victim set exclusively to Sheathminer, but places the actor among the Chinese groups exploiting ToolShell against targets including government and telecommunications organizations. Known aliases directly supported by the content are Violet Typhoon and APT31.

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OPERATIONAL PROFILE

Targeting

Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.

Where they're from

Attributed origin per open-source reporting.

  • CN
MITRE ATT&CK

Tradecraft

2 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.

2 of 15 tactics2 techniques×N= number of intelligence reports citing this technique
MITRE ATT&CK
TA0001
Initial Access
1 technique
T1190
Exploit Public-Facing Application
TA0007
Discovery
1 technique
T1083
File and Directory Discovery
ARSENAL

Associated malware families

1 malware family attributed to this actor across reporting.

FamilyContextEvidenceLast seen
Warlock"Storm-2603 was using the exploit to deploy Warlock and another ransomware payload, LockBit."1Mar 18, 2026
WEAPONIZED

Associated vulnerabilities

1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.

CVE-2025-53770ToolShell unauthenticated RCE in Microsoft SharePoint ServerIn the wildEvidence1

China-based attackers used the ToolShell vulnerability (CVE-2025-53770) to compromise a telecoms company in the Middle East shortly after the vulnerability was publicly revealed and patched in July 2025... ToolShell affects on-premise SharePoint servers and gives an attacker unauthenticated access to vulnerable servers, allowing them to remotely execute code and access all content and file systems.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app
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Target overlap

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Tradecraft mapping2

Every observed MITRE ATT&CK technique, grouped by tactic.

Malware arsenal1

Families this actor is known to deploy, with IOCs and behavior.

Exploited CVEs1

CVEs this actor has used in known campaigns.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Observables

Domains, IPs, and hashes tied to this actor, refreshed continuously.