Threat Group Cards: A Threat Actor Encyclopedia Archived: 2026-04-05 17:17:57 UTC Home > List all groups > List all tools > List all groups using tool Retro Tool: Retro Names Retro Category Exploits Type Backdoor Description (Qihoo 360) The backdoor program used in this attack is actually the Retro series backdoor known to be used by the APT-C-06 organization. Information Malpedia Last change to this tool card: 24 April 2021 Download this tool card in JSON format All groups using tool Retro Changed Name Country Observed APT groups DarkHotel 2007-2023 1 group listed (1 APT, 0 other, 0 unknown) Source: https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=cacc4de8-a9b2-4231-9fdb-8aefa8ed0a5c https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=cacc4de8-a9b2-4231-9fdb-8aefa8ed0a5c Page 1 of 1