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Ghostwriter, also tracked as FrostyNeighbor, UNC1151, UAC-0057, TA445, PUSHCHA, and Storm-0257, is a long-running Belarus-linked cyberespionage and influence actor active since at least 2016. The group is widely associated with operations aligned with Belarusian state interests and has concentrated on Eastern Europe, especially Ukraine, Poland, and Lithuania. Ghostwriter primarily targets government, military, defense, and other strategically relevant organizations, with additional activity against industrial, healthcare, and logistics entities. Its operations have combined network intrusion, credential theft, and information operations. Reported tradecraft includes spearphishing with themed lure documents, exploitation of webmail vulnerabilities such as Roundcube XSS, selective payload delivery based on victim geography, and staged malware deployment with manual victim validation. A recurring element of the group’s tooling is PicassoLoader, which has appeared in multiple implementations including .NET, PowerShell, JavaScript, and C++. Ghostwriter has used PicassoLoader to fingerprint compromised systems, transmit host information to operator-controlled infrastructure, and conditionally retrieve follow-on payloads. Later stages have commonly involved Cobalt Strike for post-compromise access. The actor has also used credential-stealing and email-message-stealing payloads, abused legitimate services for delivery or tracking, and employed persistence mechanisms such as autorun entries and shortcut-based execution. Observed campaigns against Ukrainian government organizations in 2026 used spearphishing emails impersonating a telecommunications provider, geofenced delivery infrastructure, JavaScript-based PicassoLoader, and selective deployment of Cobalt Strike against higher-value victims. Earlier reporting also tied the group to targeting of Polish and Lithuanian organizations, including exploitation of Roundcube to exfiltrate credentials. Ghostwriter’s blend of espionage, credential collection, tailored malware staging, and influence-oriented activity makes it a notable Belarus-linked threat actor focused on regional geopolitical objectives.
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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.
37 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
5 malware families attributed to this actor across reporting.
2 CVEs this actor has used in observed campaigns. 2 of them exploited in the wild.
Additionally, CERT-PL reported that the group exploited the CVE‑2024‑42009 XSS vulnerability in Roundcube, which enables JavaScript execution upon opening of weaponized email messages, to exfiltrate the victim’s credentials.
Moreover, the group uses a wide variety of lure documents to compromise its targets, such as CHM, XLS, PPT, or DOC, and it has exploited the WinRAR vulnerability CVE‑2023‑38831.
56 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Conducting spear-phishing-led intrusion campaigns against Ukrainian government organizations, with selective follow-on payload delivery to high-value targets; broader targeting also affects military, defense, industrial, healthcare, logistics, and government entities in Ukraine, Poland, and Lithuania.
Long-running cyberespionage actor aligned with Belarusian interests, targeting governmental, military, and other key sectors in Eastern Europe. Recent activity targeted Ukrainian governmental organizations using spearphishing attachments, server-side victim validation, PicassoLoader, and Cobalt Strike, while broader operations also included credential harvesting, disinformation, and compromises across Poland and Lithuania.
FrostyNeighbor is a threat actor exploiting XSS vulnerabilities in Roundcube and targeting Polish and Lithuanian companies with spearphishing emails, delivering credential and email stealers.
Espionage-oriented activity using malicious CHM files, assessed as Belarus-attributed, targeting Polish organizations and historically interested in multiple Eastern/Central European countries.
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.