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Storm-1175 is a financially motivated, China-linked ransomware threat actor tracked by Microsoft. The group previously conducted rapid ransomware operations associated with the Medusa ecosystem and, from August 2026, deployed a custom C++ ransomware family known as StormEncryptor. Its operations combine file encryption with threats to publish stolen data, constituting double extortion. Storm-1175 is characterized by high-velocity exploitation of newly disclosed and, in some cases, pre-disclosure vulnerabilities in internet-facing enterprise products. Microsoft has associated the actor with exploitation of more than 16 vulnerabilities since 2023, affecting products including Microsoft Exchange, PaperCut, Ivanti Connect Secure, ConnectWise ScreenConnect, JetBrains TeamCity, SimpleHelp, CrushFTP, GoAnywhere MFT, SmarterMail, BeyondTrust, and N-able N-central. Recent StormEncryptor activity was assessed as likely involving CVE-2026-18577, an authentication-bypass vulnerability in N-able N-central. Compromise of remote monitoring and management infrastructure can provide access to managed downstream customer environments. Post-compromise tradecraft includes remote administration through AnyDesk or SimpleHelp, network and host discovery using Advanced IP Scanner, credential dumping from LSASS with Mimikatz, and lateral movement through RDP, PsExec, and WMI. The actor abuses legitimate remote-management tooling and can deploy tunneling capabilities to retain access. Storm-1175 has been observed progressing from initial access to credential theft, data exfiltration, and ransomware deployment in as little as 24 hours. Documented victim sectors include health care, financial services, and professional services, principally in the United States, United Kingdom, and Australia.
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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.
37 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 says that Storm-1175 most likely used a publicly known zero-day vulnerability, CVE-2026-18577, to gain unauthorized access to N-central. N-able identified active exploitation on July 31; its first patch was ineffective, and it later issued two additional emergency patches. The vulnerability has a CVSS score of 8.2 and was added to CISA's Known Exploited Vulnerabilities catalog on August 3.
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, China-based ransomware group that exploits N-central remote-monitoring-and-management infrastructure to compromise managed organizations. It previously conducted Medusa ransomware activity and has shifted to StormEncryptor, accelerating ransom operations against downstream victims within 24 hours.
A group identified by Microsoft as using Medusa ransomware in fast-paced operations.
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.
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.