New "Cavalry Werewolf" Attack Hits Russian Agencies with FoalShell and StallionRAT
Oct 03, 2025
Cybersecurity / Malware
A threat actor that's known to share overlaps with a hacking group called YoroTrooper has been observed targeting the Russian public sector with malware families such as FoalShell and StallionRAT. Cybersecurity vendor BI.ZONE is tracking the activity under the moniker Cavalry Werewolf . It's also assessed to have commonalities with clusters tracked as SturgeonPhisher, Silent Lynx, Comrade Saiga, ShadowSilk, and Tomiris. "In order to gain initial access, the attackers sent out targeted phishing emails disguising them as official correspondence from Kyrgyz government officials," BI.ZONE said . "The main targets of the attacks were Russian state agencies, as well as energy, mining, and manufacturing enterprises." In August 2025, Group-IB revealed attacks mounted by ShadowSilk targeting government entities in Central Asia and Asia-Pacific (APAC), using reverse proxy tools and remote access trojans written in Python and subsequently ported to PowerShell. C...