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LONEPAGE is a Windows malware family used by the Russia-aligned threat cluster UAC-0099 in espionage operations targeting Ukrainian organizations, including government, public-sector, defense, and defense-industrial entities. Public reporting places its use in campaigns active since at least late 2023, including operations that exploited CVE-2023-38831 in WinRAR and later phishing-driven activity against Ukrainian targets.
LONEPAGE has been delivered through phishing and exploit-based intrusion chains associated with UAC-0099. Documented delivery methods include phishing emails and exploitation of the WinRAR vulnerability CVE-2023-38831 to execute malicious content on victim systems. In more recent UAC-0099 operations, LONEPAGE appears to have been supplanted by MATCHBOIL-based infection chains, indicating an evolution in the group’s tooling.
Available reporting in this context does not provide a detailed technical breakdown of LONEPAGE’s internal functionality comparable to later UAC-0099 malware, but its operational use is consistently tied to unauthorized access and cyber-espionage activity against Ukrainian institutions. Its role in those campaigns supports classification as a trojan used for compromise and follow-on malicious activity on Windows hosts.
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1 CVE Mallory has correlated with this family across public research and vendor advisories. Each row links to the full Mallory page for that vulnerability.
Prior attacks have been observed leveraging security flaws in WinRAR software (CVE-2023-38831, CVSS score: 7.8) to propagate a malware called LONEPAGE.
1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
CERT-UA published a new advisory attributing a phishing campaign to UAC-0099, a Russia-aligned threat actor active since at least mid-2022 and previously known for exploiting WinRAR vulnerabilities and using phishing emails to deliver malware families including LONEPAGE, MATCHBOIL, and DRAGSTARE.
2 distinct techniques documented for this family, organized by ATT&CK tactic.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Previously used malware family associated with earlier UAC-0099 phishing campaigns.
A malware strain previously delivered by UAC-0099 through exploitation of WinRAR security flaws.
Malware previously delivered by UAC-0099 (via WinRAR CVE-2023-38831); the report suggests MATCHBOIL may be used to replace it.
A malware family previously propagated via exploitation of a WinRAR flaw in attacks attributed to UAC-0099.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.