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BianLian is a financially motivated cybercriminal ransomware and data-extortion group, assessed by the FBI as likely Russia-based. Active since at least 2022, it initially conducted double-extortion attacks, encrypting systems while threatening to publish stolen data through a leak site. After a public decryptor became available in January 2023, BianLian shifted primarily to encryption-less, data-theft extortion. BianLian has targeted organizations globally, with a substantial concentration of reported victims in the United States. Healthcare, manufacturing, telecommunications and communications, construction, and education organizations have been affected. The group has used phishing, exploitation of public-facing applications and VPN appliances, compromised remote-access credentials, and valid accounts for initial access. It has exploited the ProxyShell Microsoft Exchange vulnerability chain and has been linked to exploitation of SAP NetWeaver vulnerabilities. During intrusions, BianLian uses custom Go-based backdoors and encryptors as well as living-off-the-land tools and remote-access software. Observed behaviors include network and domain discovery, credential dumping, account creation and manipulation, Remote Desktop Protocol, Windows Remote Management, WMI, PowerShell, scheduled tasks, and deployment of additional tooling. The group evades defenses by impairing security products and firewalls, modifying security settings, and in some cases using Safe Mode to reduce endpoint protection coverage. It collects and transfers stolen data to external and cloud-based storage for extortion. BianLian has also used remote monitoring and management tools. Reported aliases include BianLian Group, BianLian Ransomware Gang, and BianLian Ransomware Group.
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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.
59 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
3 malware families attributed to this actor across reporting.
6 CVEs this actor has used in observed campaigns. 6 of them exploited in the wild.
However, prior flaws (CVE-2025-31324) impacting SAP products, including NetWeaver, have been weaponized by China-nexus espionage clusters like UNC5221, UNC5174, and CL-STA-0048, as well as cybercrime groups such as BianLian and RansomExx. In April 2025, unknown threat actors were also observed exploiting the same critical SAP NetWeaver vulnerability to deploy a backdoor called Auto-Color.
The BianLian group has successfully targeted the ProxyShell vulnerability chain (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) to gain initial access into victim networks.
The BianLian group has successfully targeted the ProxyShell vulnerability chain (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) to gain initial access into victim networks.
The BianLian group has successfully targeted the ProxyShell vulnerability chain (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) to gain initial access into victim networks.
The BianLian ransomware group was observed by GuidePoint Security exploiting CVE-2024-27198 and CVE-2024-27199 to deliver malware including Jasmin ransomware. CISA added CVE-2024-27198 to its Known Exploited Vulnerabilities catalog on March 7, 2024.
1 more CVE tied to this actor tracked in Mallory.
104 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.
Russia-based extortion group that shifted from ransomware encryption to pure data theft and coercive extortion after a decryptor became available.
Named because Qilin uses infrastructure that overlaps with BianLian; the reference provides no further details on BianLian activity.
Referenced as a cybercriminal group previously observed exploiting SAP product vulnerabilities, specifically CVE-2025-31324.
Referenced as a cybercrime group that previously weaponized SAP product flaws including CVE-2025-31324.
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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.