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Storm-1175 is a financially motivated, China-linked ransomware threat actor tracked by Microsoft. The group has been associated with rapid, exploit-driven intrusions against exposed internet-facing systems and remote management infrastructure, often compressing the timeline from initial access to data theft and ransomware deployment to less than 24 hours or only a few days. Storm-1175 was previously linked to the Medusa ransomware operation and later began deploying a custom ransomware strain known as StormEncryptor, marking a shift away from exclusive reliance on the Medusa ecosystem. The actor is notable for aggressively weaponizing newly disclosed and n-day vulnerabilities across a broad set of enterprise products, including Microsoft Exchange, Ivanti Connect Secure and Policy Secure, ConnectWise ScreenConnect, JetBrains TeamCity, PaperCut, SimpleHelp, CrushFTP, GoAnywhere MFT, SmarterMail, BeyondTrust, SAP NetWeaver, Fortinet FortiClient EMS, and N-able N-central. Recent activity has been tied to likely exploitation of CVE-2026-18577 in N-able N-central, a remote monitoring and management platform, creating elevated downstream risk for managed service providers and their customers. Post-compromise tradecraft includes use of remote administration tools for persistent access, network discovery utilities for reconnaissance, credential dumping from LSASS, lateral movement through administrative tooling, and data exfiltration prior to ransomware execution. Reported tooling and behaviors include remote access software, PowerShell, PsExec, RDP, Impacket, PDQ Deployer, credential theft with Mimikatz, and tunneling or defense-evasion measures. Storm-1175 has also been observed abusing legitimate administration frameworks and moving hands-on-keyboard through victim environments to accelerate ransomware deployment and extortion. Victimology consistently includes healthcare, education, finance, and professional services organizations, with confirmed targeting in the United States, United Kingdom, and Australia. The actor’s operations align with financially motivated extortion, including theft of victim data and threats to publish stolen information in addition to file encryption.
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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.
Geographies tied to known operations.
Attributed origin per open-source reporting.
34 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
13 malware families attributed to this actor across reporting.
8 additional families tracked in Mallory.
23 CVEs this actor has used in observed campaigns. 23 of them exploited in the wild.
Microsoft has not confirmed the vulnerability targeted by Storm-1175 in this campaign, the threat actor is likely exploiting the CVE-2026-18577 authentication bypass vulnerability in N-able, which was disclosed on August 2, 2026 and added to the CISA Known Exploited Vulnerabilities (KEV) catalog on August 3, 2026.
Since 2023, Microsoft Threat Intelligence has observed exploitation of over 16 vulnerabilities, including: CVE-2023-21529 (Microsoft Exchange)
Since 2023, Microsoft Threat Intelligence has observed exploitation of over 16 vulnerabilities, including: CVE-2024-1709 and CVE-2024-1708 (ConnectWise ScreenConnect)
Since 2023, Microsoft Threat Intelligence has observed exploitation of over 16 vulnerabilities, including: CVE-2025-10035 (GoAnywhere MFT)
Since 2023, Microsoft Threat Intelligence has observed exploitation of over 16 vulnerabilities, including: CVE-2023-27351 and CVE-2023-27350 (Papercut)
18 more CVEs tied to this actor tracked in Mallory.
8 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A financially motivated ransomware actor conducting rapid attacks by exploiting newly disclosed and sometimes zero-day vulnerabilities in exposed systems, then moving quickly to data theft and ransomware deployment. The group has shifted from using Medusa to a new ransomware called StormEncryptor.
Financially motivated activity cluster linked to China conducting high-velocity ransomware campaigns, including deployment of StormEncryptor and earlier use of Medusa, while exploiting supply-chain/RMM access to reach downstream victim networks.
Financially motivated threat actor tracked by Microsoft that previously used Medusa ransomware and is now deploying the StormEncryptor ransomware variant after exploiting vulnerable internet-facing systems, then rapidly moving to credential theft, data exfiltration, and ransomware deployment.
Financially motivated ransomware actor rapidly exploiting newly disclosed internet-facing vulnerabilities, compromising RMM infrastructure, conducting hands-on-keyboard activity, lateral movement, data theft, and deploying ransomware via double extortion. The content highlights a shift from reliance on Medusa to use of a custom encryptor, StormEncryptor.
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.