Threats Tagged 'impacket'

Two newly identified backdoors, OctLurk and SilkLurk, have been targeting government organizations across Central Asia since January 2025. Victims span Afghanistan, Kyrgyzstan, Tajikistan, Uzbekistan, Kazakhstan, and Syria, affecting healthcare, research, government offices, ministries of foreign affairs, logistics, law enforcement, urban planning, and educational institutions. Both backdoors employ heavily obfuscated loaders customized per victim, using machine-specific data for decryption. They deploy multiple plugins for command execution, file manipulation, credential harvesting, keylogging, network scanning, and remote access. The attackers also utilized LurkProxy for network traffic proxying and deployed additional tools including PlugX, Impacket, FSCAN, and Pandora FMS agents. Analysis indicates both backdoors are operated by the same Chinese-speaking threat actor, though attribution to a specific known group remains unconfirmed. The campaigns demonstrate sophisticated persistence mechanisms and ext...

MediumMalwareAfghanistanKazakhstanKyrgyzstan+3#silklurk#cyber-espionage#octlurk

Between January and June 2026, multiple unrelated organizations experienced nearly identical intrusions following a standardized seven-step attack chain. The attacks exploited CitrixBleed 2 (CVE-2025-5777), a memory-overread vulnerability in NetScaler ADC and Gateway appliances. Attackers sent malformed pre-authentication login requests that leaked NetScaler memory containing valid session tokens, bypassing multi-factor authentication by hijacking active sessions. Following initial access, threat actors consistently escalated privileges to SYSTEM using a registry-symlink exploitation technique targeting the AppMgmt service, created rogue administrator accounts (CtxAppVCOMService, ctxsvc, test), and established persistence through legitimate remote access tools including ScreenConnect and Zoho Assist. The most advanced case culminated in DragonForce ransomware deployment. The highly standardized tradecraft, reused infrastructure, and consistent indicators across unrelated victims suggest a single Initial Ac...

On April 16, 2026, a threat actor leveraged stolen VPN credentials to access a Windows workstation and deployed a SYSTEM-level backdoor using the Komari agent, an open-source monitoring tool with built-in command-and-control capabilities. The attacker authenticated through an SSLVPN session from IP 45.153.34[.]132 and used Impacket smbexec.py to enable RDP on the target system. The Komari agent was installed as a persistent Windows service named 'Windows Update Service' using NSSM, pulling the installer directly from the official GitHub repository. Komari provides bidirectional control through WebSocket connections, offering arbitrary command execution, interactive reverse shell access, and network probing capabilities by default. Microsoft Defender quarantined an earlier registry dump attempt, forcing the adversary to pivot to this GitHub-based approach. This represents the first publicly documented case of Komari being abused in a real-world intrusion.

The initial access broker (IAB), whom Talos calls “ToyMaker” and assesses with medium confidence is a financially motivated threat actor, exploits vulnerable systems exposed to the internet. They deploy their custom-made backdoor we call “LAGTOY” and extract credentials from the victim enterprise. LAGTOY can be used to create reverse shells and execute commands on infected endpoints.

LowMalwareGermanyFranceUnited Kingdom+4#initial access broker#ransomware#lagtoy