Detectionmediumtest
Suspicious File Drop by Exchange
Detects suspicious file type dropped by an Exchange component in IIS
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Log Source
WindowsFile Event
ProductWindows← raw: windows
CategoryFile Event← raw: file_event
Events for file system activity including creation, modification, and deletion.
Detection Logic
Detection Logic2 selectors
detection:
selection:
Image|endswith: '\w3wp.exe'
CommandLine|contains: 'MSExchange'
selection_types:
TargetFilename|endswith:
- '.aspx'
- '.asp'
- '.ashx'
- '.ps1'
- '.bat'
- '.exe'
- '.dll'
- '.vbs'
condition: all of selection*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Sub-techniques
Rule Metadata
Rule ID
6b269392-9eba-40b5-acb6-55c882b20ba6
Status
test
Level
medium
Type
Detection
Created
Tue Oct 04
Path
rules/windows/file/file_event/file_event_win_exchange_webshell_drop_suspicious.yml
Raw Tags
attack.persistenceattack.t1190attack.initial-accessattack.t1505.003