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Exchange Set OabVirtualDirectory ExternalUrl Property

Rule to detect an adversary setting OabVirtualDirectory External URL property to a script in Exchange Management log

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Jose RodriguezCreated Mon Mar 15Updated Mon Jan 239db37458-4df2-46a5-95ab-307e7f29e675windows
Log Source
Windowsmsexchange-management
ProductWindows← raw: windows
Servicemsexchange-management← raw: msexchange-management
Detection Logic
Detection Logic1 selector
detection:
    keywords:
        '|all':
            - 'Set-OabVirtualDirectory'
            - 'ExternalUrl'
            - 'Page_Load'
            - 'script'
    condition: keywords
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
twitter.com
MITRE ATT&CK
Rule Metadata
Rule ID
9db37458-4df2-46a5-95ab-307e7f29e675
Status
test
Level
high
Type
Detection
Created
Mon Mar 15
Modified
Mon Jan 23
Author
Jose Rodriguez
Path
rules/windows/builtin/msexchange/win_exchange_set_oabvirtualdirectory_externalurl.yml
Raw Tags
attack.persistenceattack.t1505.003
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