Emerging Threatcriticaltest
Exchange Exploitation CVE-2021-28480
Detects successful exploitation of Exchange vulnerability as reported in CVE-2021-28480
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Launch
Florian Roth (Nextron Systems)Created Fri May 14Updated Mon Jan 02a2a9d722-0acb-4096-bccc-daaf91a5037b2021
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
Web Server Log
CategoryWeb Server Log← raw: webserver
HTTP access logs from web servers capturing request paths, methods, and status codes.
Detection Logic
Detection Logic2 selectors
detection:
selection:
cs-uri-query|contains: '/owa/calendar/a'
cs-method: 'POST'
filter_main_status:
sc-status: 503
condition: selection and not 1 of filter_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Other
cve.2021-28480detection.emerging-threats
Rule Metadata
Rule ID
a2a9d722-0acb-4096-bccc-daaf91a5037b
Status
test
Level
critical
Type
Emerging Threat
Created
Fri May 14
Modified
Mon Jan 02
Path
rules-emerging-threats/2021/Exploits/CVE-2021-28480/web_cve_2021_28480_exchange_exploit.yml
Raw Tags
attack.initial-accessattack.t1190cve.2021-28480detection.emerging-threats