Norm_id=WindowsSysmon label="Process" label=Create image="*\Tor Browser\Browser\firefox.exe" Use of the Tor browser can be detected from the same events. Norm_id=WindowsSysmon label="Process" label=Create image="*tor.exe" Tor client execution can be picked up from Windows Event Logs or Sysmon. to extension to almost any onion link makes it accessible from the clearnet. This way, the malware doesn’t require the bells and whistles of a full-blown Tor client.įireEye has observed Russian nation-state attackers APT29 employing domain fronting with Tor for stealthy backdoor access to victim environments on the APT side. The increasing trend of malware using Tor means that administrators should consider how to detect, and if necessary, block, Tor use in their enterprise. To make matters simple for malware to access a website hosted in the Tor, free services like Tor2web enable anyone to connect to an onion site with any regular browser. Kaspersky also noted that a few banking malware families, such as 64-bit ZeuS Trojans, use Tor connections. There are also some ransomware variants like Onion that use Tor to hide their C
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