Detectioncriticaltest
WMI Backdoor Exchange Transport Agent
Detects a WMI backdoor in Exchange Transport Agents via WMI event filters
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Florian Roth (Nextron Systems)Created Fri Oct 11Updated Wed Feb 08797011dc-44f4-4e6f-9f10-a8ceefbe566bwindows
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic3 selectors
detection:
selection:
ParentImage|endswith: '\EdgeTransport.exe'
filter_conhost:
Image: 'C:\Windows\System32\conhost.exe'
filter_oleconverter: # FP also documented in https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=18
Image|startswith: 'C:\Program Files\Microsoft\Exchange Server\'
Image|endswith: '\Bin\OleConverter.exe'
condition: selection and not 1 of filter_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Rule Metadata
Rule ID
797011dc-44f4-4e6f-9f10-a8ceefbe566b
Status
test
Level
critical
Type
Detection
Created
Fri Oct 11
Modified
Wed Feb 08
Path
rules/windows/process_creation/proc_creation_win_wmi_backdoor_exchange_transport_agent.yml
Raw Tags
attack.privilege-escalationattack.persistenceattack.t1546.003