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UAC-0099, also tracked as Earth Sirrush and formerly SHADOW-EARTH-065, is a cyberespionage threat actor active since at least 2022. Its targets include Ukrainian government agencies, financial institutions, media, military and defense organizations, border guards, transportation and logistics operators, manufacturers, and energy companies. The group obtains initial access through spear-phishing links and attachments, frequently using institutional impersonation and document-themed decoys. Delivery chains include archives containing VBScript, Windows shortcuts, or HTA files, exploitation of WinRAR vulnerability CVE-2023-38831, VHD containers, and DLL sideloading involving legitimate applications such as Notepad++. Its tooling includes the LONEPAGE command-execution malware, MATCHBOIL downloader, MATCHWOK backdoor, DRAGSTARE information stealer, ASHVEIN information stealer and remote access trojan, THUMBCHOP browser stealer, and CLOGFLAG keylogger. More recent loaders and components include LUNCHPOKE, BURNYBEAR, and MATCHBOIL.V2. MATCHBOIL retrieves and installs additional payloads and establishes persistence through scheduled tasks or registry-based autostart mechanisms. Successive variants introduced recurring payload retrieval, commercial .NET obfuscation, debugger and sandbox checks, and deceptive graphical interfaces. Associated implants support remote-command execution, browser-password and cookie theft, screenshots, file collection, system fingerprinting, and subnet scanning. The group uses encrypted web-based command-and-control communications and Cloudflare to conceal infrastructure. UAC-0099 has also used GuardBreaker, an anti-analysis technique that embeds safety-sensitive text in script comments to attempt to interrupt LLM-assisted malware analysis. The technique targets the inspection process without changing the script's runtime behavior.
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.
Attributed origin per open-source reporting.
40 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
17 malware families attributed to this actor across reporting.
12 additional families tracked in Mallory.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
154 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.
Associated with MATCHBOIL through the repository's UAC-0099 directory. The supplied indicators describe C# downloader executables and DLLs, command-and-control infrastructure, and payload persistence. The content does not identify victims, geographic targeting, or state sponsorship.
A likely Russia-affiliated cyber-espionage group targeting Ukrainian transportation, manufacturing, and energy organizations. It uses MatchBoil to deliver the MatchWok backdoor, refining obfuscation, sandbox evasion, and persistence to maintain access. ESET suggests it may act as an initial access broker for Sandworm; this relationship is not confirmed.
Conducts cyberespionage against Ukrainian organizations using spear-phishing and the MATCHBOIL downloader to deploy additional malicious components. Reported victims include transportation, manufacturing, and energy organizations; earlier targets included government agencies, financial institutions, and media institutions. ESET assesses alignment with Russian interests with medium confidence, but the content does not establish Russian state sponsorship or the group's country of origin.
Russia-aligned cyber espionage group targeting Ukrainian organizations through spear-phishing and MATCHBOIL infections. Between 2024 and 2026, its downloader evolved with advanced .NET obfuscation, sandbox and anti-analysis checks, and modified persistence mechanisms. MATCHBOIL retrieves additional payloads, including the MATCHWOK backdoor, over HTTPS.
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.