Abuse of Legitimate Remote Access Tools for Lateral Movement and Persistence
Threat actors are increasingly leveraging legitimate remote access tools, such as PuTTY and various remote monitoring and management (RMM) platforms, to facilitate lateral movement, data exfiltration, and persistent access within compromised networks. Attackers exploit the "living off the land" nature of these tools, blending their malicious activities with normal administrative operations to evade detection. In the case of PuTTY, adversaries use binaries like plink.exe and pscp.exe to move laterally and exfiltrate sensitive data, often leaving behind subtle forensic traces such as SSH host keys in the Windows registry. These artifacts can be crucial for investigators to reconstruct attacker activity, even after extensive log and artifact cleanup by the attackers.
Similarly, security researchers have observed a surge in incidents where multiple RMM tools are abused in attack chains. Threat actors compromise or install RMM platforms like ScreenConnect, TeamViewer, Atera, NinjaRMM, and GoTo Resolve to maintain long-term access and persistence. Attackers often use phishing lures to trick victims into installing rogue RMM software, and may deploy several RMM tools in succession to ensure continued access even if one is detected and removed. These tactics highlight the ongoing challenge for defenders in distinguishing between legitimate and malicious use of remote access utilities, underscoring the need for robust monitoring and baselining of such tools within enterprise environments.
Timeline
Dec 19, 2025
Recent campaigns use SEO-poisoned PuTTY downloads to deliver Oyster backdoor
The report described recent campaigns in which SEO-poisoned PuTTY downloads were used to install the Oyster backdoor, enabling further compromise and data theft. It also linked similar SSH-based tradecraft to actors including DarkSide operators and North Korean APTs.
Dec 19, 2025
Researchers highlight PuTTY abuse for lateral movement and exfiltration
Cyber Security News reported that attackers are increasingly using the legitimate PuTTY SSH client and components such as plink.exe and pscp.exe for stealthy lateral movement and data exfiltration in compromised Windows networks. The report noted that registry artifacts under PuTTY's SSH host key storage can help investigators reconstruct attacker activity even after filesystem evidence is removed.
Dec 18, 2025
Huntress SOC detects and disrupts multi-RMM intrusion attempts
Huntress said its SOC identified and neutralized several incidents involving rogue RMM deployments, often before the attackers could escalate privileges or deliver additional payloads. The company also published indicators of compromise including suspicious domains and file paths tied to the abuse.
Dec 18, 2025
Threat actors adopt legitimate RMM tools for initial access and persistence
Huntress reported observing attackers increasingly abuse legitimate remote monitoring and management tools such as ScreenConnect, GoTo Resolve, SimpleHelp, PDQ, and ITarian to gain access and maintain persistence in victim environments. In multiple incidents, attackers chained several RMM tools together after phishing-based social engineering lures to improve redundancy and evade detection.
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