MediumSigmaHQ frack113 +2

VHD Image Download Via Browser

Detects creation of ".vhd"/".vhdx" files by browser processes. Malware can use mountable Virtual Hard Disk ".vhd" files to encapsulate payloads and evade security controls.

Detection logic

Detection requirements

Platform: PRE
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: windows
Log source category: file_event

Known benign triggers

Legitimate downloads of ".vhd" files would also trigger this

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
redcanary.com/blog/intelligence-insights-october-2021/	Security research	3
securelist.com/lazarus-on-the-hunt-for-big-game/97757/	Unclassified	Only this detection cites it
www.kaspersky.com/blog/lazarus-vhd-ransomware/36559/	Unclassified	Only this detection cites it

Detection rules

VHD Image Download Via Browser

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules