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Blue Mockingbird is a financially motivated cybercrime threat actor known for compromising Microsoft IIS servers to deploy Monero cryptocurrency miners. The group is strongly associated with exploitation of CVE-2019-18935 in Progress Telerik UI for ASP.NET AJAX to achieve remote code execution on vulnerable internet-facing web servers, particularly enterprise IIS environments. Its operations are characterized by opportunistic exploitation of public-facing applications followed by rapid miner deployment and persistence establishment. Observed tradecraft includes exploitation of vulnerable web applications for initial access, use of PowerShell reverse TCP shells for interactive command execution, and abuse of native Windows utilities such as rundll32.exe and regsvr32.exe to execute custom-compiled XMRig miner DLLs. Blue Mockingbird has established persistence through Windows Scheduled Tasks on both local and remote hosts and has modified the Windows Registry to specify DLL payloads. The actor has also used batch scripts to automate payload deployment and execution, collected host hardware details including CPU and memory information for victim profiling, and employed masquerading by naming malicious DLLs to resemble legitimate Windows components. Blue Mockingbird is best known as a cryptojacking intrusion set rather than an espionage or ransomware actor. Public reporting links the group to large-scale exploitation of vulnerable IIS servers and conversion of compromised enterprise infrastructure into cryptocurrency-mining nodes.
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43 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
11 malware families attributed to this actor across reporting.
6 additional families tracked in Mallory.
10 CVEs this actor has used in observed campaigns. 10 of them exploited in the wild.
The CVE-2019-18935 vulnerability, with its critical 9.8 severity score, is an untrusted deserialization vulnerability within the proprietary Progress Telerik UI (for ASP.NET AJAX) library... While originally published in December 2019, the flaw continues to be exploited even today despite patches and fixes having been made available.
This detection identifies instances where Windows Explorer.exe spawns PowerShell or cmd.exe processes, particularly focusing on executions initiated by LNK files. This behavior is associated with the ZDI-CAN-25373 Windows shortcut zero-day vulnerability, where specially crafted LNK files are used to trigger malicious code execution through cmd.exe or powershell.exe. This technique has been actively exploited by multiple APT groups in targeted attacks through both HTTP and SMB delivery methods.
This analytic identifies potential exploitation attempts of ProxyShell (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) and ProxyNotShell (CVE-2022-41040, CVE-2022-41082) vulnerabilities in Microsoft Exchange Server.
This analytic identifies potential exploitation attempts of ProxyShell (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) and ProxyNotShell (CVE-2022-41040, CVE-2022-41082) vulnerabilities in Microsoft Exchange Server.
This analytic identifies potential exploitation attempts of ProxyShell (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) and ProxyNotShell (CVE-2022-41040, CVE-2022-41082) vulnerabilities in Microsoft Exchange Server.
5 more CVEs tied to this actor tracked in Mallory.
6 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.
Listed as one of many threat actors associated with the detection's ATT&CK-style annotations for PowerShell and DNS TXT command-and-control behavior; no specific campaign or activity is described in this reference.
Mentioned only in a list of actors associated with exploiting public-facing applications.
Listed as an associated threat actor in the detection annotation for exploitation of the public-facing PTC Windchill vulnerability CVE-2026-4681.
Listed as an associated threat actor for exploitation activity related to abuse of the Windows Cloud Files API / cldapi.dll detection.
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.