Hacked sites push TeamViewer using fake expired certificate alert This means that the backdoor could stay undetected for months gathering intel, and data – and no one will be any the wiser. It looks like due to this backdoor’s limited functionality and simple coding style, it is not easy for anti-malware systems to detect it as malware. It also contacts the command and control (C2) server via an HTTPS encrypted channel every five seconds to check if there were new commands from the operator. The backdoor can upload and execute files or exfiltrate files from the infected system. Attackers try to hide the malicious activities by naming the service “Windows Time Service”, like the existing Windows service.

The adversaries install the TinyTurla backdoor as a service on the infected machine. It could also be used as a second-stage dropper to infect the system with additional malware. TinyTurla – Turla deploys new malware to keep a secret backdoor on victim machinesĬisco Talos recently discovered a new backdoor used by the Russian Turla APT group which is likely used as a stealth second-chance backdoor to keep access to infected devices even if the primary malware is removed.

Is teamviewer safe 2021