MediumSplunk security content Michael Haag +1

Windows DotNet Binary in Non Standard Path

Description

The following analytic detects the execution of native .NET binaries from non-standard directories within the Windows operating system. It leverages Endpoint Detection and Response (EDR) telemetry, comparing process names and original file names against a predefined lookup "is_net_windows_file". This activity is significant because adversaries may move .NET binaries to unconventional paths to evade detection and execute malicious code. If confirmed malicious, this behavior could allow attackers to execute arbitrary code, escalate privileges, or maintain persistence within the environment, posing a significant security risk. Also this analytic leverages a sub-search to enhance performance. sub-searches have limitations on the amount of data they can return. Keep this in mind if you have an extensive list of ransomware note file names.

Detection logic

Detection requirements

Platform: Linux macOS Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source category: crowdstrike_processrollup2 sysmon_eventid_1 windows_event_log_security_4688

Known benign triggers

False positives may be present and filtering may be required. Certain utilities will run from non-standard paths based on the third-party application in use.

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
attack.mitre.org/techniques/T1036/003/	Taxonomy	8
github.com/redcanaryco/atomic-red-team/blob/388942adbd9641f4dfdcf079d7efe9a75ec0ac43/atomics/T1036.003/T1036.003.yaml#L74	Detection test	2
github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1036.003/T1036.003.yaml	Detection test	3
github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1218.004/T1218.004.md	Detection test	5
www.microsoft.com/security/blog/2022/01/15/destructive-malware-targeting-ukrainian-organizations/	Threat report	27from 2 sources

Detection rules

Windows DotNet Binary in Non Standard Path

Description

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules