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MediumSigmaHQ Nasreddine Bencherchali (Nextron Systems) +1

Suspicious LNK Double Extension File Created

Detects the creation of files with an "LNK" as a second extension. This is sometimes used by malware as a method to abuse the fact that Windows hides the "LNK" extension by default.

Detection logic

Detection requirements

Platform: Windows
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

Some tuning is required for other general purpose directories of third party apps

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
twitter.com/luc4m/status/1073181154126254080	Social post	2
twitter.com/malwrhunterteam/status/1235135745611960321	Social post	2
www.anomali.com/blog/china-based-apt-mustang-panda-targets-minority-groups-public-and-private-sector-organizations	Unclassified	2
www.crowdstrike.com/blog/meet-crowdstrikes-adversary-of-the-month-for-june-mustang-panda/	Security research	2
www.cybereason.com/blog/research/a-bazar-of-tricks-following-team9s-development-cycles	Unclassified	2

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