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AvosLocker is a financially motivated cybercriminal ransomware-as-a-service (RaaS) operation identified in 2021. Also known as Avos Locker, it initially targeted Windows environments and later introduced Linux encryptors designed for VMware ESXi virtualization infrastructure. The operation uses encryption, data theft, Tor-based leak sites, and the threatened sale or auction of stolen victim data to pressure victims, constituting a double-extortion model. It recruits and supports affiliates through a RaaS program. Observed AvosLocker activity includes spam-based delivery and exploitation of Microsoft Exchange ProxyShell vulnerabilities for initial access. Operators and affiliates have used credential dumping, Remote Desktop Protocol for movement within victim networks, remote administration tools, and deployment tooling to distribute ransomware. AvosLocker has abused Windows Safe Mode to impair endpoint security controls and has been associated with bring-your-own-vulnerable-driver activity to bypass or disable endpoint defenses. Its Linux ransomware can identify ESXi and VMFS environments, stop virtual machines before encryption, and encrypt virtualized workloads. AvosLocker has targeted organizations in the United States, United Kingdom, Belgium, Spain, Lebanon, and the United Arab Emirates, including healthcare entities.
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.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
46 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.
9 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.