Symantec and Trend Micro are among the list of leading antivirus companies that a group of Russian-speaking hackers allege to have compromised, Gizmodo has learned. It remains unclear to what degree the claim is true, if any.

Last week, Advanced Intelligence (AdvIntel), a New York-based threat-research firm, reported that a hacking group was attempting to sell internal corporate documents and source code purportedly stolen from three major antivirus companies. Citing an ongoing law enforcement investigation and its own disclosure policies, AdvIntel did not reveal the names of the alleged victims.