{ "family": "conti", "sample_count": 180, "category": "ransomware", "description": "Conti is arguably the most aggressive and professionally structured ransomware syndicate in cybersecurity history, operated by the Russian cybercrime group Wizard Spider from early 2020 until its public splintering in mid-2022. Emerging as the operational successor to Ryuk, Conti operated an enterprise-grade Ransomware-as-a-Service (RaaS) model backed by full-time software developers, HR recruiters, OSINT researchers, and negotiators. Conti engineered a remarkably fast multi-threaded encryption engine: utilizing 32 concurrent worker threads, it achieves rapid parallel encryption using ChaCha20 stream cipher for data blocks combined with an embedded 4096-bit RSA public key to protect the session keys. Conti was staged via elite initial-access loaders, including TrickBot, BazarLoader, and Bumblebee, and weaponized Active Directory vulnerabilities such as Zerologon (CVE-2020-1472) and PrintNightmare (CVE-2021-34527) for rapid enterprise-wide privilege escalation. The group pioneered aggressive double-extortion tactics, leaking stolen corporate data on their 'Conti.News' dark web portal. Conti famously attacked over 1,000 organizations, including healthcare networks, law enforcement agencies, and the national infrastructure of Costa Rica, prompting the Costa Rican government to declare a national state of emergency in May 2022. Following their public pledge of allegiance to the Russian state in February 2022, an anonymous researcher leaked thousands of internal Jabber chat logs ('ContiLeaks'), exposing their corporate organizational chart, bitcoin wallets, and source code. CISA published Alert AA21-265A detailing Conti technical indicators and defensive mitigations.", "cta": "Published by the SystemHelpdesk threat intelligence team.", "aliases": [ "Conti Ransomware", "Conti.News", "Trojan.Ransom.Conti", "Win32/Conti", "Wizard Spider Conti" ], "enrichment_level": "curated_sourced", "faq": [ { "@type": "Question", "name": "What is Conti ransomware and who operated it?", "acceptedAnswer": { "@type": "Answer", "text": "Conti was a dominant Ransomware-as-a-Service operation active between 2020 and 2022, operated by the Russian cybercrime group Wizard Spider as the technological successor to Ryuk." } }, { "@type": "Question", "name": "What made Conti's encryption engine so fast?", "acceptedAnswer": { "@type": "Answer", "text": "Conti utilized 32 concurrent worker threads to execute multi-threaded parallel encryption using the ChaCha20 stream cipher, allowing it to encrypt entire corporate file servers in minutes." } }, { "@type": "Question", "name": "What happened during the 2022 Costa Rica ransomware attack?", "acceptedAnswer": { "@type": "Answer", "text": "In May 2022, Conti hit 27 government ministries in Costa Rica, disrupting customs, healthcare, and tax systems, prompting the President of Costa Rica to declare a national state of emergency." } }, { "@type": "Question", "name": "What were the 'ContiLeaks'?", "acceptedAnswer": { "@type": "Answer", "text": "In March 2022, after Conti declared support for the Russian invasion of Ukraine, an insider leaked two years of internal chat logs, source code, and training materials, exposing the syndicate's operational structure." } }, { "@type": "Question", "name": "What guidance is provided in CISA Alert AA21-265A?", "acceptedAnswer": { "@type": "Answer", "text": "CISA Alert AA21-265A outlines indicators of compromise, network hunting rules for TrickBot and BazarLoader, and mitigations including multi-factor authentication, network segmentation, and endpoint detection." } }, { "@type": "Question", "name": "How did Conti utilize multithreading and Windows I/O completion ports for lightning-fast encryption?", "acceptedAnswer": { "@type": "Answer", "text": "Conti was renowned for being one of the fastest ransomware strains ever analyzed. It leveraged Windows I/O Completion Ports (IOCP) paired with 32 concurrent worker threads per CPU core to queue and process file encryption tasks asynchronously. This allowed Conti to encrypt local and mapped network shares simultaneously, completing enterprise-scale encryption in minutes before defensive responders could intervene." } }, { "@type": "Question", "name": "What role did BazarLoader and Cobalt Strike play in Conti's initial intrusion and lateral movement pipeline?", "acceptedAnswer": { "@type": "Answer", "text": "Conti operators relied on a standardized enterprise intrusion kill-chain. Initial access was predominantly brokered via phishing campaigns dropping BazarLoader or TrickBot. Once established, operators deployed Cobalt Strike Beacon to conduct internal network mapping, execute BloodHound domain audits, and harvest LSASS credentials, culminating in PsExec or WMI-driven distribution of the final Conti binary." } }, { "@type": "Question", "name": "What key YARA hunting rules and Sigma signatures detect Conti execution in SIEM/EDR platforms?", "acceptedAnswer": { "@type": "Answer", "text": "Detection rules for Conti focus on its characteristic pre-encryption actions: terminating system services (such as Acronis, Veeam, SQL, and Exchange) via NetStop or TaskKill commands, executing 'vssadmin delete shadows /all /quiet', and querying open network shares via NetShareEnum. YARA rules match on Conti's unique string decryption routines, mutex formatting strings, and ransom note generation templates (readme.txt)." } } ], "faq_count": 8, "mitre_attack": [ "T1486", "T1490", "T1021.002", "T1059.001", "T1068", "T1003.001", "T1071.001", "T1547.001", "T1041" ], "cisa_advisory": "AA21-265A", "exploited_cves": [ "CVE-2020-1472", "CVE-2021-34527" ], "iocs": { "file_hashes": [ "2b6a5db21d00f7e44a42e5d7db69b466ea2084c55bc66c5d1e2e1329c31b312b", "a17387f5df2307ef086915091219b671a172776c59b67195721118182969b761", "5c84dfc8df34e64ff476bf43a8ce90150e7b95204481ae515efb64dd9bf0e20e" ], "delivery": [ "Delivered as secondary payload via TrickBot, BazarLoader, and Bumblebee initial access", "Spear-phishing emails containing malicious Office attachments or ISO container files", "Exploitation of Active Directory vulnerabilities Zerologon CVE-2020-1472 and PrintNightmare CVE-2021-34527" ], "persistence": [ "Service creation under Windows Service Control Manager with randomized alphanumeric names", "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run entry pointing to dropped payload", "Automated scheduled tasks executing with NT AUTHORITY\\SYSTEM privileges" ] }, "lineage": { "derived_from": [ "ryuk", "hermes" ], "variants": [ "conti_v1", "conti_v2", "conti_v3", "blackcat_alphv_offshoot", "quantum_ransomware" ] }, "ecosystem": [ "windows", "linux", "vmware_esxi" ], "attack_stage": [ "initial_access", "execution", "persistence", "privilege_escalation", "defense_evasion", "credential_access", "discovery", "lateral_movement", "exfiltration", "impact" ], "last_updated": "2026-10-16", "sources": [ { "name": "CISA Advisory AA21-265A: Conti Ransomware", "url": "https://www.cisa.gov/news-events/cybersecurity-advisories/aa21-265a" }, { "name": "FBI Flash Alert: Indicators of Compromise Associated with Conti Ransomware", "url": "https://www.ic3.gov/Media/News/2021/210520.pdf" }, { "name": "Mandiant: Dissecting the Conti Ransomware Ecosystem", "url": "https://www.mandiant.com/resources/blog/tracking-conti-ransomware" }, { "name": "Krebs on Security: The Conti Ransomware Leaks", "url": "https://krebsonsecurity.com/2022/03/conti-ransomware-group-chats-leaked/" } ], "target_platforms": [ "Windows 11", "Windows 10", "Windows Server 2022", "Windows Server 2019" ] }