HighSigmaHQ Florian Roth (Nextron Systems) +2

Suspicious Double Extension File Execution

Detects suspicious use of an .exe extension after a non-executable file extension like .pdf.exe, a set of spaces or underlines to cloak the executable file in spear phishing campaigns

Detection logic

Detection requirements

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

Known benign triggers

Unknown

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
blu3-team.blogspot.com/2019/06/misleading-extensions-xlsexe-docexe.html	Unclassified	Only this detection cites it
cloud.google.com/blog/topics/threat-intelligence/cybercriminals-weaponize-fake-ai-websites	Product documentation	4
twitter.com/blackorbird/status/1140519090961825792	Social post	Only this detection cites it

Detection rules

Suspicious Double Extension File Execution

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules