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Nick Zolotko, Christopher Lopez, & Adam Kohler
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28 min readPasivRobber: Chinese Spyware or Security Tool?
On March 13, 2025, our team found a suspicious mach-O file on Virustotal named wsus. After our initial analysis of this file and the package which installed it, we discovered over 20 related binaries used to capture data from macOS systems and applications, including WeChat, QQ, web browsers, email, etc. This multi-binary suite indicates a deep understanding of macOS and their target applications. The software’s targeted applications and other observed network connections strongly indicate both a Chinese origin and target user base.
Threat Intelligence