Detectioncriticaltest
ProxyLogon MSExchange OabVirtualDirectory
Detects specific patterns found after a successful ProxyLogon exploitation in relation to a Commandlet invocation of Set-OabVirtualDirectory
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Florian Roth (Nextron Systems)Created Mon Aug 09Updated Mon Jan 23550d3350-bb8a-4ff3-9533-2ba533f4a1c0windows
Log Source
Windowsmsexchange-management
ProductWindows← raw: windows
Servicemsexchange-management← raw: msexchange-management
Detection Logic
Detection Logic2 selectors
detection:
keywords_cmdlet:
'|all':
- 'OabVirtualDirectory'
- ' -ExternalUrl '
keywords_params:
- 'eval(request'
- 'http://f/<script'
- '"unsafe"};'
- 'function Page_Load()'
condition: keywords_cmdlet and keywords_paramsFalse Positives
Unlikely
False positives are unlikely for most environments. High confidence detection.
References
MITRE ATT&CK
Sub-techniques
Rule Metadata
Rule ID
550d3350-bb8a-4ff3-9533-2ba533f4a1c0
Status
test
Level
critical
Type
Detection
Created
Mon Aug 09
Modified
Mon Jan 23
Path
rules/windows/builtin/msexchange/win_exchange_proxylogon_oabvirtualdir.yml
Raw Tags
attack.t1587.001attack.resource-development