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Threat Actor

Medusa

medusa_ransomware · russia_speaking_cybercrime · active since 2021

Medusa (Medusa Blog / Spearwing / G1056) is one of the more operationally consequential ransomware operations of the 2022- 2024 period, a financially-motivated organized cyber-criminal cluster operating from Russia and adjacent post-Soviet states emerging in June 2021, analytically distinguished from older MedusaLocker ransomware operations (active 2019+, a separate cluster), with 300+ documented victim organizations per CISA + FBI + MS-ISAC joint cybersecurity advisory AA24-060A (February 29, 2024)

most operationally distinctive cluster signature the triple-extortion model combining encryption + data-theft-and- publication-threat + media-pressure-tradecraft (Medusa Blog leak site with public ransom-countdown timers, Telegram channel victim-shaming announcements, selective media-outreach to financial reporters about publicly-traded victim companies seeking stock-price pressure, detailed victim-organization information including sample-data-publication and ransom-amount public-display), explicit cluster-level investment in pressure- and-urgency-as-extortion-tradecraft uncommon among publicly- tracked ransomware operations.

high-profile documented victims including Minneapolis Public Schools (February-March 2023, ~100K student/staff records, public ransom refusal, data subsequently published on Medusa Blog), Toyota Financial Services Europe (November 2023), Kansas City Kansas government (April 2024), and the Dragos industrial cybersecurity firm targeting attempt (May 2024, Dragos publicly disclosed and refused ransom , operationally significant counter-extortion response model for cybersecurity-vendor targets)

initial-access tradecraft centers on spear-phishing + RDP credential theft + VPN credential stuffing against MFA-less endpoints + selective n-day exploitation including ProxyLogon, PrintNightmare, Log4Shell, Confluence, Follina, Citrix ADC, Citrix Bleed, ScreenConnect.

russia_speaking_cybercrime confidence: high 13 aliases

Profile

Medusa (also tracked as Medusa Blog, Spearwing [Bitdefender], and MITRE ATT&CK G1056) is one of the more operationally consequential ransomware operations of the 2022-2024 period, a financially- motivated organized cyber-criminal cluster operating predominantly from Russia and adjacent post-Soviet states emerging in June 2021. The cluster should be analytically distinguished from older MedusaLocker ransomware operations (active since approximately 2019, a separate ransomware family operated by a different cluster), vendor consensus treats Medusa (the modern RaaS brand emerging June 2021) and MedusaLocker (the older ransomware family) as operationally distinct cluster identities despite the similar naming. The cluster has compromised 300+ organizations globally per CISA + FBI + MS-ISAC joint cybersecurity advisory AA24-060A (February 29, 2024).

The cluster's most operationally distinctive signature is the triple-extortion model combining encryption + data-theft-and- publication-threat + media-pressure-tradecraft.

While most contemporary ransomware operations rely on the encryption-and- leak-site extortion model alone, Medusa adds active media- pressure components
  • Medusa Blog leak site featuring ransom-countdown timers publicly displaying time-to-data-publication for victim organizations, explicit cluster-level investment in pressure- and-urgency-as-extortion-tradecraft.
  • Telegram channel for public victim-shaming announcements.
  • Selective media-outreach to financial reporters about publicly-traded victim companies seeking to leverage stock- price pressure.
  • Detailed victim-organization information publication including sample-data-publication and ransom-amount public-display The media-pressure-tradecraft element is operationally distinctive among publicly-tracked ransomware operations and represents a meaningful operational-doctrine data point.
The cluster's most operationally consequential operations include
  • Minneapolis Public Schools (February-March 2023): compromise of ~100,000 student and staff records; Minneapolis publicly refused $1M USD ransom; data subsequently published on Medusa Blog leak site.
  • Toyota Financial Services Europe (November 2023): operations disruption across multiple European subsidiaries with substantial customer-data exposure.
  • Kansas City Kansas (April 2024): municipal government IT disruption including courts, payment systems, administrative services.
  • Dragos industrial cybersecurity firm (May 2024 attempt): Dragos publicly disclosed intrusion attempt and refused ransom; operationally consequential as counter-extortion response model for cybersecurity-vendor targets Operationally the cluster's initial-access tradecraft centers on spear-phishing with weaponized attachments, RDP credential theft from underground marketplaces and infostealer deployments, VPN credential stuffing against MFA-less VPN authentication endpoints, and selective exploitation of disclosed n-day vulnerabilities including CVE-2021-26855 (ProxyLogon Exchange), CVE-2021-34527 (PrintNightmare), CVE-2021-44228 (Log4Shell), CVE-2022-26134 (Confluence), CVE-2022-30190 (Follina), CVE-2023- 3519 (Citrix ADC), CVE-2023-4966 (Citrix Bleed), and CVE-2024- 1709 (ScreenConnect). The cluster operates Linux + ESXi ransomware variants alongside the Windows variant, consistent with broader contemporary cybercrime-cluster patterns of VMware ESXi hypervisor targeting. A handful of operational notes: First, the cluster represents one of the more operationally consequential newer ransomware operations of the 2022-2024 period and one of the most distinctive triple-extortion-with-media- pressure-tradecraft operations in the publicly-tracked record. The media-pressure-tradecraft pattern is operationally significant defender threat-modeling consideration, victim organizations should anticipate active media-outreach as additional pressure component beyond conventional data-publication threat. Second, no formal individual-operator attribution at the named- Russian-national tier has been publicly issued for Medusa administrators, consistent with the broader pattern of absence of similar named-individual-attribution for Cl0p, ALPHV / BlackCat, Black Basta, Akira, Play, and several other contemporary cybercrime clusters. Only LockBit (Khoroshev), Evil Corp (Yakubets / Turashev), and FIN7 (Dunaev / Hladyr / Kolpakov / Witte) have received named-Russian-national-tier formal attribution among the major contemporary cybercrime clusters covered in this corpus. Third, the Dragos counter-extortion response model (May 2024) represents an operationally significant case study for cybersecurity-vendor targets and broader corporate threat- modeling. Dragos publicly disclosed full incident details and refused ransom payment, an operational pattern that contrasts with the conventional silent-ransom-payment approach historically common in ransomware victim response. The Dragos model contributes to broader analytical questions about whether systematic public-disclosure-and-refusal patterns could undermine ransomware operational viability over time. Fourth, the cluster's distinction from older MedusaLocker operations is operationally important for defender threat- modeling. Confusion between the two clusters in early reporting contributed to attribution-difficulty; modern vendor consensus treats them as separate cluster identities and defender threat- modeling should treat them as separate threat patterns despite the similar naming.

Aliases

13
medusamedusa ransomwaremedusa_ransomwaremedusaransomwaremedusa blogmedusa_blogmedusablogspearwingspear wingspear_wingg1056atk 273atk273

Notable Campaigns

9
2024-2025Continued Operations (2024-2025)
2024CISA + FBI + MS-ISAC AA24-060A Medusa Cybersecurity Advisory (February 29, 2024)
2024Kansas City Kansas Government Attack (April 2024)
2024Dragos Industrial Cybersecurity Firm Targeting Attempt (May 2024)
2023Minneapolis Public Schools Attack (February-March 2023)
2023Toyota Financial Services Europe Attack (November 2023)
2022-2024Media Pressure Tradecraft and Public Victim Shaming (2022-2024)
2022Medusa Blog Leak Site Launch and Ransom-Countdown Tradecraft (2022)
2021Medusa Emergence (June 2021)

Attribution & Reporting

Attributed by
FBI Cyber DivisionCISA (US Cybersecurity and Infrastructure Security Agency)Multi-State Information Sharing and Analysis Center (MS-ISAC)Mandiant / Google Cloud Threat IntelligenceMicrosoft Threat Intelligence CenterCrowdStrikeRecorded Future Insikt GroupSentinelOneSophosTrend MicroKaspersky GReATGroup-IBPRODAFTCovewareHalcyonCybereasonIBM X-ForceTrustwave SpiderLabsPalo Alto Networks Unit 42Symantec (Broadcom)TrellixDFIR ReportBitdefenderGuidePoint Security
Key reporting
reportCISA + FBI + MS-ISAC: AA24-060A #StopRansomware Medusa Ransomware Joint Cybersecurity Advisory (February 29, 2024), most operationally significant US-government formal public attribution
reportCrowdStrike: Medusa Ransomware Tracking (multiple years)
reportMandiant: Medusa Ransomware Continued Tracking
reportCisco Talos: Medusa Ransomware Deep Dive
reportPalo Alto Networks Unit 42: Medusa Ransomware Operational Analysis
reportBitdefender: Medusa Ransomware Spearwing Tracking
reportTrend Micro: Medusa Ransomware Spotlight (March 2023)
reportSentinelOne Labs: Medusa Ransomware Tracking
reportMicrosoft Threat Intelligence: Medusa Ransomware (March 2024)
reportRecorded Future Insikt Group: Medusa Ransomware Tracking
reportSophos: Medusa Ransomware Continued Tracking
reportCoveware: Medusa Ransomware Affiliate Tracking
reportHalcyon: Medusa Operational Profile
reportPRODAFT: Medusa Detailed Operational Analysis
reportGroup-IB: Medusa Continued Tracking
reportTrustwave SpiderLabs: Medusa Tracking
reportTrellix: Medusa Operational Analysis
reportSymantec (Broadcom): Medusa Ransomware Tracking
reportDFIR Report: Medusa Operational Analysis
reportGuidePoint Security: Medusa Incident Response Tracking
reportMalpedia Actor Profile: Medusa
reportMITRE ATT&CK Group G1056, Medusa

Operational

State sponsor

Medusa is a financially-motivated organized cyber-criminal cluster , not a state-aligned cluster, operating predominantly from Russia and adjacent post-Soviet states. The cluster emerged in approximately June 2021 and represents one of the more operationally consequential ransomware operations of the 2022- 2024 period. The cluster operates the Medusa ransomware-as-a- service brand and should be analytically distinguished from older MedusaLocker ransomware operations (active since approximately 2019, a separate ransomware family operated by a different cluster), vendor consensus treats Medusa (the modern RaaS brand emerging June 2021) and MedusaLocker (the older ransomware family) as operationally distinct cluster identities despite the similar naming, though some early reporting conflated the two.

The cluster has received the most operationally significant US-government formal public attribution among newer ransomware operations through CISA + FBI + MS-ISAC joint cybersecurity advisory AA24-060A (February 29, 2024) documenting Medusa responsibility for compromise of 300+ organizations globally across multiple sectors. The cluster operates a distinctive triple-extortion model combining encryption + data- theft-and-publication-threat + media-pressure-tradecraft, including a ransom-countdown leak site that publicly displays countdown timers to data-publication for victim organizations, Telegram-channel-based public victim shaming, and selective media-outreach to financial reporters about victim organizations seeking to leverage stock-price pressure on publicly-traded victim companies. The media-pressure-tradecraft element is operationally distinctive among publicly-tracked ransomware operations and represents a meaningful operational-doctrine data point.

No formal individual-operator attribution at the named-Russian-national tier has been publicly issued for Medusa administrators.

Motivations
financial_gain, financially_motivated, cybercrime, ransomware_deployment, extortion, double_extortion, triple_extortion, media_pressure_tradecraft, victim_shaming_tradecraft, ransomware_as_a_service_operations
Sectors
Regions

Detection Blind Spots

60 techniques
Across this actor’s 60 mapped techniques, the share covered by each detection layer. Low bars are where you’d be blind if this actor targeted you.
Behavioral / log (Sigma)57/60 · 95%
Analytics (MITRE CAR)30/60 · 50%
Runtime / container (Falco)8/60 · 13%
File / malware (YARA)0/60 · 0%
Network (Suricata/Snort)16/60 · 26%
Vuln scan (Nuclei)0/60 · 0%

Atomic Test Plan

30 techniques
Runnable Atomic Red Team tests covering this actor’s mapped techniques - validate your detections against this specific adversary. Cross-reference the blind spots above. For authorized lab / purple-team use. Open the full builder

Tools Used

3 mapped
Other tooling / TTPs (curation, not ATT&CK-mapped):
MEDIA OUTREACH PRESSURE TRADECRAFTMEDUSA BLOG LEAK SITEMEDUSA ESXI VARIANTMEDUSA LINUX VARIANTMEGA NZMETERPRETERMSHTASHARPHOUNDSPLASHTOP ABUSE
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