Emerging Threathightest
Possible Exploitation of Exchange RCE CVE-2021-42321
Detects log entries that appear in exploitation attempts against MS Exchange RCE CVE-2021-42321
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Florian Roth (Nextron Systems)Created Thu Nov 18Updated Tue Jul 12c92f1896-d1d2-43c3-92d5-7a5b35c217bb2021
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
Windowsmsexchange-management
ProductWindows← raw: windows
Servicemsexchange-management← raw: msexchange-management
Detection Logic
Detection Logic1 selector
detection:
selection:
EventID:
- 6
- 8
Data|contains:
- 'Cmdlet failed. Cmdlet Get-App, '
- 'Task Get-App throwing unhandled exception: System.InvalidCastException:'
condition: selectionFalse Positives
Unknown, please report false positives via https://github.com/SigmaHQ/sigma/issues
References
MITRE ATT&CK
Tactics
Techniques
Other
detection.emerging-threats
Rule Metadata
Rule ID
c92f1896-d1d2-43c3-92d5-7a5b35c217bb
Status
test
Level
high
Type
Emerging Threat
Created
Thu Nov 18
Modified
Tue Jul 12
Path
rules-emerging-threats/2021/Exploits/CVE-2021-42321/win_exchange_cve_2021_42321.yml
Raw Tags
attack.lateral-movementattack.t1210detection.emerging-threats