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Threat Actor

Black Basta

black_basta · russia_speaking_cybercrime · active since 2022

Black Basta (Storm-1811 / UNC4393 / G1042) is one of the most prolific 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 April 2022 as one of the major successor brands following the Wizard Spider / Conti operational shutdown (May- June 2022, already covered as wizard_spider_conti.yaml) with substantial personnel-overlap and tooling-overlap with the broader Wizard Spider / Conti ecosystem, documented as responsible for compromise of 500+ organizations globally per CISA + FBI + HHS + MS-ISAC AA24-131A advisory (May 10, 2024); most operationally consequential operations include Capita Plc attack (March 2023, ~90+ UK BPO customer organizations affected), ABB attack (May 2023, Swedish-Swiss industrial automation multinational), Dish Network attack (February 2023, US satellite television, weeks of customer service disruption), Ascension Health attack (May 2024, one of the largest US Catholic healthcare systems with 140+ hospitals, weeks of hospital operational disruption including ambulance diversions), and Synnovis UK NHS pathology services attack (June 2024, weeks of UK NHS blood testing and pathology disruption with cancelled surgeries and blood shortages)

initial-access tradecraft evolved across three phases, Qakbot loader partnership (May 2022 - August 2023, ended with August 2023 FBI Operation Duck Hunt disruption of Qakbot), alternative loader portfolio (Pikabot + DarkGate + Bumblebee + IcedID, 2023-2024), and Microsoft Teams social engineering tradecraft pivot (2024, operators impersonate IT helpdesk personnel via Teams external-tenant federation offering to "help" with deliberately-generated email spam volumes then induce target employees to grant remote access via Quick Assist + AnyDesk + ScreenConnect)

most operationally significant cluster-exposure event the February 2025 BlackBastaLeaks, ContiLeaks-style internal chat-log exposure of ~200,000+ internal Black Basta operator chat communications spanning ~September 2023 - September 2024 published by a Russia-Ukraine-war-aligned cluster member following operator divisions about cluster operational decisions and apparent connections to broader Russian state security service interests, documenting operator identities, financial-management infrastructure, project-management workflows, victim-negotiation tradecraft, and apparent intelligence-service- adjacent contacts, second major ContiLeaks-style organized- cybercrime-cluster internal-exposure event in the publicly-tracked record after February 2022 ContiLeaks.

post-BlackBastaLeaks operations substantially degraded with apparent personnel reorganization into next-successor-brand identities.

russia_speaking_cybercrime confidence: high 23 aliases MITRE ATT&CK G1046 ↗

Profile

Black Basta (also tracked as Storm-1811 [Microsoft], UNC4393 [Mandiant], and MITRE ATT&CK G1042) is one of the most prolific ransomware operations of the 2022-2024 period, a financially- motivated organized cyber-criminal cluster operating predominantly from Russia and adjacent post-Soviet states. The cluster emerged in April 2022 as one of the major successor brands following the Wizard Spider / Conti operational shutdown (May-June 2022, already covered as wizard_spider_conti.yaml) and maintains substantial personnel-overlap and tooling-overlap with the broader Wizard Spider / Conti ecosystem. The April 2022 emergence with immediate operational sophistication and high operational tempo (multiple high-profile victims within weeks of emergence) is one of the clearest cases of cluster-personnel-reorganization- under-new-brand in the publicly-tracked record.

CISA + FBI + HHS + MS-ISAC AA24-131A advisory (May 10, 2024) documented Black Basta responsibility for compromise of 500+ organizations globally. The cluster's operational lineage and successor-brand framing represents one of the most analytically interesting elements of the publicly-tracked cybercrime ecosystem.

Following the May- June 2022 Wizard Spider / Conti shutdown, cluster personnel reorganized under multiple successor brand identities
  • Black Basta (operational from April 2022), the most operationally prolific Conti successor.
  • Karakurt (extortion-only operation, no encryption, financial model based purely on data-theft-and-publication threat)
  • Royal / BlackSuit (operational from January 2022, rebranded BlackSuit in 2023)
  • Quantum.
  • BlackByte.
  • Zeon The successor-diaspora pattern represents the dominant operational model for major cybercrime cluster shutdown-and-rebranding events. Operationally Black Basta's initial-access tradecraft evolved across three major phases: First, Qakbot loader partnership (May 2022.
  • August 2023). Black Basta operated extensive partnership with Qakbot (Qbot) for initial-access delivery. Following the August 2023 FBI Operation Duck Hunt disruption of Qakbot infrastructure (one of the most operationally consequential counter-cybercrime operations of 2023), Black Basta pivoted to alternative initial-access loaders. Second, alternative loader portfolio (August 2023.
  • 2024). Black Basta operations pivoted to Pikabot, DarkGate, Bumblebee, IcedID, and other loaders for initial-access delivery during this period. Third, Microsoft Teams social engineering tradecraft (2024). Documented Black Basta operational pivot toward Microsoft Teams- based social engineering during 2024, Black Basta operators (using compromised or attacker-created Teams accounts impersonating IT helpdesk personnel via Microsoft Teams external-tenant federation) contacted target organization employees offering to "help" with email spam volumes that Black Basta operators had themselves deliberately generated through high-volume email- bombing. The social-engineering pattern induced target employees to grant remote access via legitimate remote-access tools (Quick Assist, AnyDesk, ScreenConnect) followed by hands-on-keyboard ransomware deployment. The tradecraft represents operational sophistication beyond conventional spear-phishing and is conceptually similar to Scattered Spider's smishing-to-vishing pattern (already covered as scattered_spider.yaml) but adapted for Microsoft Teams.
The cluster's most operationally consequential operations included
  • Capita Plc attack (March 2023): UK business-process-outsourcing firm with cascading impact on UK public-sector and pension- administration customers (estimated 90+ Capita customer organizations affected)
  • ABB attack (May 2023): Swedish-Swiss multinational industrial automation conglomerate.
  • Dish Network attack (February 2023): US satellite television provider, weeks of customer service disruption.
  • Ascension Health attack (May 2024): one of the largest US Catholic healthcare systems (140+ hospitals across US), weeks of hospital operational disruption including ambulance diversions and paper-based clinical workflows.
  • Synnovis UK NHS pathology services attack (June 2024): private pathology services provider serving multiple UK NHS hospital trusts, weeks of UK NHS blood testing and pathology disruption with cancelled surgeries and blood shortages The cluster's most operationally significant exposure event was the February 2025 BlackBastaLeaks, a ContiLeaks-style internal chat-log exposure of approximately 200,000+ internal Black Basta operator chat communications spanning approximately one year (September 2023.
  • September 2024) published by a Russia-Ukraine-war-aligned cluster member following operator divisions about cluster operational decisions and apparent connections to broader Russian state security service interests. The leak documented internal operational structure in unprecedented detail, operator identities and aliases, financial-management infrastructure, project-management workflows, victim-negotiation tradecraft, internal recruitment processes, and apparent intelligence-service-adjacent contacts. The BlackBastaLeaks exposure represents the second major ContiLeaks-style organized-cybercrime-cluster internal-exposure event in the publicly-tracked record after the original February 2022 ContiLeaks and provides additional public-source-research data points supporting the broader analytical framing that elements of the Russia-speaking organized cybercrime ecosystem maintain operational connections with Russian state security services. Following the February 2025 BlackBastaLeaks exposure, Black Basta operations have been substantially degraded with reduced operational tempo and apparent operator-personnel reorganization. Black Basta personnel are widely assessed to be reorganizing under successor brand identities consistent with the broader Russia-speaking organized cybercrime ecosystem successor-diaspora pattern (Wizard Spider / Conti.
  • Black Basta + Karakurt + Royal / BlackSuit + Quantum + BlackByte + Zeon, and now Black Basta.
  • next-successor-brands). A handful of operational notes: First, the cluster represents one of the most operationally consequential ransomware operations of the 2022-2024 period and a critical reference for understanding Wizard Spider / Conti successor operations. The 500+ documented victim organizations and the healthcare-sector targeting (Ascension Health, Synnovis UK NHS) collectively represent substantial cybercrime operational impact. Second, the BlackBastaLeaks exposure (February 2025) is one of the most operationally significant cluster-exposure events of the 2022-2025 period. The combination of ContiLeaks (February 2022) and BlackBastaLeaks (February 2025) provides exceptionally detailed public-source-research about the internal operations of two related successor clusters within the Russia-speaking organized cybercrime ecosystem. Third, no formal individual-operator attribution at the named- Russian-national tier has been publicly issued for Black Basta administrators despite the substantial operational impact and the operationally-significant BlackBastaLeaks exposure, a notable analytical gap consistent with the absence of similar named-individual-attribution for Cl0p, ALPHV / BlackCat, 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. Fourth, the Microsoft Teams social engineering tradecraft pivot (2024) represents an operationally significant tradecraft evolution. The pattern complements similar tradecraft evolution observed in Scattered Spider (smishing-to-vishing) and represents broader contemporary cybercrime-cluster pivot toward social- engineering-against-legitimate-collaboration-tools as initial- access vector. Defender threat-modeling should treat Microsoft Teams and other legitimate collaboration platforms as meaningful initial-access surface area requiring social-engineering-aware controls beyond conventional email-phishing controls.

Aliases

23
black bastablack_bastablackbastablack basta ransomwareblack_basta_ransomwareblackbastaransomwarestorm-1811storm 1811storm_1811upstreamdataupstream dataupstream_dataupstreamdataserviceswizard spider successorwizard_spider_successorconti successorconti_successorcard lawyercard_lawyerblackbastaleaksg1042atk 245atk245

Notable Campaigns

10
2025BlackBastaLeaks Internal Chat Log Exposure (February 2025)
2025Post-BlackBastaLeaks Operational Status (February 2025 onward)
2024CISA + FBI + HHS + MS-ISAC AA24-131A Black Basta Cybersecurity Advisory (May 10, 2024)
2024Ascension Health Attack (May 2024)
2024Synnovis UK NHS Pathology Services Attack (June 2024)
2024Microsoft Teams Social Engineering Tradecraft Pivot (2024)
2023Capita Plc Attack (March 2023)
2023ABB + Dish Network Attacks (2023)
2022-2023Qakbot Loader Partnership (May 2022 - August 2023)
2022Black Basta Emergence Following Conti Shutdown (April 2022)

Attribution & Reporting

Attributed by
FBI Cyber DivisionCISA (US Cybersecurity and Infrastructure Security Agency)HHS Health Sector Cybersecurity Coordination Center (HC3)US Department of Health and Human ServicesMandiant / Google Cloud Threat IntelligenceMicrosoft Threat Intelligence CenterCrowdStrikeRecorded Future Insikt GroupSentinelOneSophosTrend MicroKaspersky GReATGroup-IBPRODAFTCybereasonIBM X-ForceTrustwave SpiderLabsTrellixPWC Threat IntelligenceDFIR ReportCovewareHalcyonPalo Alto Networks Unit 42BlackBastaLeaks (internal chat-log exposure, February 2025)
Key reporting
reportCISA + FBI + HHS + MS-ISAC: AA24-131A Black Basta Cybersecurity Advisory (May 10, 2024), highest-tier US-government formal public attribution
reportMicrosoft Threat Intelligence: Threat Actors Misusing Quick Assist in Social Engineering Attacks Leading to Black Basta Ransomware (May 15, 2024), Teams social engineering tradecraft disclosure
reportMandiant: UNC4393 Black Basta Ransomware Continued Tracking
reportCrowdStrike: Baltic Host Ransomware Relationship Between Black Basta and Conti
reportRecorded Future Insikt Group: Black Basta Tracking (multiple years)
reportSentinelOne Labs: Black Basta Ransomware Attacks Deploy Custom EDR Evasion Tools
reportTrend Micro: Black Basta Ransomware Gang Infiltrates Networks via Qakbot (September 2022)
reportCisco Talos: Black Basta Deep Dive
reportSophos: Black Basta Operational Tracking
reportCoveware: Black Basta Ransomware Tracking
reportHalcyon: Black Basta Operational Profile
reportPRODAFT: Black Basta Detailed Operational Analysis
reportGroup-IB: Black Basta Continued Tracking
reportBlackBastaLeaks Internal Chat Log Public Exposure (February 2025), unprecedented internal cluster exposure of ~200,000+ chat communications
reportBleepingComputer: Black Basta Ransomware Gang Internal Chats Leak Online (February 2025)
reportMalpedia Actor Profile: Black Basta
reportMITRE ATT&CK Group G1042, Black Basta

Operational

State sponsor

Black Basta 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 April 2022 as one of the successor brands following the Wizard Spider / Conti operational shutdown (May-June 2022) and maintains substantial personnel-overlap and tooling-overlap with the broader Wizard Spider / Conti ecosystem and the broader Russia-speaking organized cybercrime ecosystem. The cluster operated as one of the most prolific ransomware operations of the 2022-2024 period with documented compromise of 500+ organizations globally including critical infrastructure, US federal contractors, multiple healthcare networks, and major multinational corporations.

The cluster has received unprecedented internal-exposure event coverage through the February 2025 "BlackBastaLeaks", a ContiLeaks-style internal chat-log exposure of approximately 200,000+ internal Black Basta operator chat communications published by a Russia-Ukraine-war-aligned cluster member following operator divisions about cluster operational decisions and apparent connections to broader Russian state security service interests. BlackBastaLeaks documented internal operational structure including operator identities and aliases, financial-management infrastructure, project-management workflows, victim-negotiation tradecraft, internal recruitment processes, and apparent intelligence-service-adjacent contacts, providing additional public-source-research data points supporting the broader analytical framing that elements of the Russia-speaking organized cybercrime ecosystem maintain operational connections with Russian state security services. No formal individual- operator attribution at the named-Russian-national tier has been publicly issued for Black Basta administrators despite the substantial operational impact and the operationally-significant BlackBastaLeaks exposure, a notable analytical gap consistent with the absence of similar named-individual-attribution for Cl0p, ALPHV / BlackCat, and several other contemporary cybercrime clusters.

Motivations
financial_gain, financially_motivated, cybercrime, ransomware_deployment, extortion, double_extortion, data_theft_for_extortion, ransomware_as_a_service_operations, critical_infrastructure_targeting
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)29/60 · 48%
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

2 mapped
Other tooling / TTPs (curation, not ATT&CK-mapped):
MEGA NZMETERPRETERMFA BOMBINGMICROSOFT TEAMS PHISHINGMSHTASHARPHOUNDSPLASHTOP ABUSE
Intelligence Graph · click any node to traverse
CVETechnique ActorTool Family
drag to reposition · click any node to traverse · button top-right enlarges
External lookups - second-class, for what we don’t hold ourselves
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