Threat Group Cards: A Threat Actor Encyclopedia
Archived: 2026-04-05 17:04:52 UTC
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 Tool: GRILLMARK
Names
GRILLMARK
Hellsing Backdoor
Category Malware
Type Backdoor
Description
This is a proxy-aware HTTP backdoor that is implemented as a service and uses the
compromised system's proxy settings to access the internet. C&C traffic is base64 encoded and
the files sent to the server are compressed with aPLib.
Information
<https://docplayer.net/5013762-Fireeye-threat-intelligence-southeast-asia-an-evolving-cyber-threat-landscape-security-reimagined-march-2015.html>
Malpedia <https://malpedia.caad.fkie.fraunhofer.de/details/win.grillmark>
Last change to this tool card: 24 April 2021
Download this tool card in JSON format
All groups using tool GRILLMARK
Changed Name Country Observed
APT groups
  Leviathan, APT 40, TEMP.Periscope 2013-Jul 2021
1 group listed (1 APT, 0 other, 0 unknown)
Source: https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=68cce88d-0ccf-4693-acc9-218462c84e67
https://apt.etda.or.th/cgi-bin/listgroups.cgi?u=68cce88d-0ccf-4693-acc9-218462c84e67
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