Loading threat actor…
AvosLocker is a ransomware-as-a-service operation first identified in 2021. It initially targeted Windows environments and later expanded to Linux, including dedicated encryptors for VMware ESXi infrastructure. The operation is associated with affiliate-based intrusion activity, data theft, victim shaming on leak sites, and partner recruitment through criminal channels. AvosLocker has used multiple initial access methods, including spam email campaigns and exploitation of Microsoft Exchange ProxyShell-related vulnerabilities such as CVE-2021-34473, CVE-2021-31206, CVE-2021-34523, and CVE-2021-31207. Reported post-compromise activity includes credential dumping with Mimikatz, Remote Desktop access, Active Directory and network resource access, and exfiltration of victim data prior to ransomware deployment. The Windows malware supports multithreaded encryption, mutex-based execution control, drive and network resource enumeration, and selective file and folder exclusions. The Linux/ESXi variant is an ELF encryptor that accepts runtime parameters, checks for ESXi and VMFS-related environments, and terminates running virtual machines before encrypting files. Across reporting, AvosLocker has been described as using strong hybrid encryption schemes and as appending family-specific extensions before dropping ransom notes. AvosLocker is also notable for defense-evasion tradecraft. It has been associated for years with abuse of Windows Safe Mode to impair endpoint protections before encryption, and it has also been cited among ransomware actors that leveraged bring-your-own-vulnerable-driver techniques to bypass or disable security tools. The group has additionally been linked to use of legitimate tools and services to support exfiltration and hands-on-keyboard operations. The operation follows an extortion model centered on stealing data and pressuring victims through leak-site publication when payment is refused. AvosLocker has advertised affiliate and partner programs and is widely tracked as a financially motivated criminal ransomware collective rather than a state-directed actor.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Geographies tied to known operations.
41 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
4 CVEs this actor has used in observed campaigns. 4 of them exploited in the wild.
According to deepweb research by Cyble Research Labs, the Threats Actors of AvosLocker ransomware groups are exploiting Microsoft Exchange Server vulnerabilities using Proxyshell, compromising the victim’s network. CVEs involved in these exploits are CVE-2021-34473, CVE-2021-31206, CVE-2021-34523, and CVE-2021-31207.
According to deepweb research by Cyble Research Labs, the Threats Actors of AvosLocker ransomware groups are exploiting Microsoft Exchange Server vulnerabilities using Proxyshell, compromising the victim’s network. CVEs involved in these exploits are CVE-2021-34473, CVE-2021-31206, CVE-2021-34523, and CVE-2021-31207.
According to deepweb research by Cyble Research Labs, the Threats Actors of AvosLocker ransomware groups are exploiting Microsoft Exchange Server vulnerabilities using Proxyshell, compromising the victim’s network. CVEs involved in these exploits are CVE-2021-34473, CVE-2021-31206, CVE-2021-34523, and CVE-2021-31207.
According to deepweb research by Cyble Research Labs, the Threats Actors of AvosLocker ransomware groups are exploiting Microsoft Exchange Server vulnerabilities using Proxyshell, compromising the victim’s network. CVEs involved in these exploits are CVE-2021-34473, CVE-2021-31206, CVE-2021-34523, and CVE-2021-31207.
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.
Referenced as another ransomware group known for abusing Safe Mode.
Mentioned only as a comparative example of another ransomware group known to use Safe Mode tactics.
Named as one of multiple ransomware groups operating data leak sites and listing fresh victims.
Mentioned only as a historical example of a ransomware family known to use Safe Mode to impair defenses.
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.