Threats Tagged 'ultravnc'

Attack campaigns targeting Korean users have been observed deploying remote control tools including Radmin and UltraVNC to compromise systems. The initial intrusion vector remains unidentified, but attackers download compressed files containing batch scripts and remote administration software. Following Radmin installation, threat actors leverage access to deploy UltraVNC alongside proxy tools such as Netch-gateway and CCProxy, ultimately utilizing compromised systems as proxy nodes. Recent variants include SoftEther VPN deployment to establish VPN servers on infected infrastructure. PowerShell scripts containing Chinese language comments, combined with tools familiar to Chinese-speaking actors, suggest attribution to Chinese threat operators. The campaigns enable both remote system control and abuse of compromised infrastructure for proxy services.

The Larva-24009 threat actor, also known as HeptaX, has been conducting phishing email campaigns since 2023, targeting Korean and global users to install malware. Active through 2026, the actor uses LNK files disguised as documents with topics like hospital surveys, blockchain, project proposals, and resumes to target enterprises. Upon execution, obfuscated PowerShell commands deploy backdoors and download additional scripts from command-and-control servers. The attack chain includes persistence mechanisms via Task Scheduler, remote access through QuasarRAT and UltraVNC, and information theft using NirSoft tools, custom keyloggers, and screenshot capabilities. The actor also creates backdoor RDP accounts and exfiltrates credentials, browser data, and user files. Version 2.1 of their Notifier malware utilizes Telegram API for status reporting. The campaigns demonstrate consistent tactics and infrastructure across multiple years of operation.

Attackers are leveraging the trusted reputation of Foxit PDF Reader, used by over 650 million people, to distribute malicious installers disguised as legitimate software. Rather than exploiting vulnerabilities, threat actors impersonate the vendor through fake installers with document-themed filenames that bypass user suspicion. When executed, these files display decoy passport images while downloading malicious MSI packages that deploy UltraVNC remote access tools disguised as GPU drivers. The attack establishes persistence through registry modifications and firewall exceptions, connecting to attacker-controlled infrastructure for complete remote system control. Telemetry indicates broad distribution across Germany, the United States, the United Kingdom, and Ukraine. This campaign demonstrates how brand impersonation combined with social engineering proves more effective than technical exploits, relying on user trust and behavioral patterns rather than software vulnerabilities.

MediumMalwareGermanyUnited StatesUnited Kingdom+1#brand abuse#document decoy#ultravnc