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MoustachedBouncer is a cyber espionage threat actor associated with Belarusian state interests. The group is known for targeting foreign diplomatic entities, embassies, and other organizations of intelligence value, particularly those operating in or connected to Belarus. It has been publicly tracked under the aliases Storm-1125 and, less commonly, MoushtachedBouncer. MoustachedBouncer is notable for conducting highly selective intrusion activity and for using adversary-in-the-middle capabilities to intercept and tamper with victim network traffic. Operations attributed to the group have included delivery of malware through malicious HTML and JavaScript content, use of PowerShell for execution, and proxy-based command-and-control. Reporting has also associated the actor with exploitation for privilege escalation. Observed tradecraft includes use of modular plugins, including components used to capture screenshots and store collected data on network shares, indicating an emphasis on surveillance and post-compromise collection. The group’s operational profile is consistent with long-term intelligence collection rather than disruptive or purely financially motivated activity. Known behavior includes staged collection of victim data, credential and session access facilitation through traffic interception, and use of tailored tooling against a narrow victim set. MoustachedBouncer is widely assessed as a state-aligned espionage actor operating in support of Belarusian government objectives.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
35 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
8 malware families attributed to this actor across reporting.
3 additional families tracked in Mallory.
3 CVEs this actor has used in observed campaigns. 3 of them exploited in the wild.
Executes C:\Users\Public\driverpack\driverpackUpdate.exe (the plugin above) using elevated rights via CVE-2021-1732.
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.
The following analytic detects when su runs from a page-cache-corrupted binary... This activity is significant because it indicates a possible privilege escalation attempt, allowing a user to gain root access... CVE CVE-2026-31431 ... References ... copy-fail-CVE-2026-31431
4 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 an annotation/tag associated with privilege escalation techniques in the detection content; no campaign or activity by the group is described in this reference.
Referenced in the detection annotations as a threat actor associated with exploitation for privilege escalation activity.
Listed as a threat actor associated with PowerShell execution behavior relevant to this detection.
Listed in the analytic annotations as a threat actor associated with exploitation for privilege escalation.
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.