HighSigmaHQ Florian Roth (Nextron Systems)

Suspicious PowerShell Download and Execute Pattern

Detects suspicious PowerShell download patterns that are often used in malicious scripts, stagers or downloaders (make sure that your backend applies the strings case-insensitive)

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: process_creation

Known benign triggers

Software installers that pull packages from remote systems and execute them

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
gist.github.com/jivoi/c354eaaf3019352ce32522f916c03d70	Tool	Only this detection cites it
www.trendmicro.com/en_us/research/22/j/lv-ransomware-exploits-proxyshell-in-attack.html	Threat report	3

Detection rules

Suspicious PowerShell Download and Execute Pattern

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules