MediumSigmaHQ Florian Roth (Nextron Systems) +3

Suspicious Group And Account Reconnaissance Activity Using Net.EXE

Detects suspicious reconnaissance command line activity on Windows systems using Net.EXE Check if the user that executed the commands is suspicious (e.g. service accounts, LOCAL_SYSTEM)

Detection logic

Detection requirements

Platform: ESXi 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

Administrative activity
Inventory tool runs

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/how-one-hospital-thwarted-a-ryuk-ransomware-outbreak/	Security research	3from 2 sources
research.nccgroup.com/2022/08/19/back-in-black-unlocking-a-lockbit-3-0-ransomware-attack/	Unclassified	4
thedfirreport.com/2020/10/18/ryuk-in-5-hours/	Threat report	3

Detection rules

Suspicious Group And Account Reconnaissance Activity Using Net.EXE

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules