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Eric
67 lines
3.1 KiB
YAML
67 lines
3.1 KiB
YAML
name: Wermgr Process Create Executable File
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id: ab3bcce0-a105-11eb-973c-acde48001122
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version: 6
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date: '2025-05-02'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the wermgr.exe process creating an executable
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file. It leverages Sysmon EventCode 11 to identify instances where wermgr.exe generates
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a .exe file. This behavior is unusual because wermgr.exe is typically associated
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with error reporting, not file creation. Such activity is significant as it may
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indicate TrickBot malware, which injects code into wermgr.exe to execute malicious
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actions like downloading additional payloads. If confirmed malicious, this could
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lead to further malware infections, data exfiltration, or system compromise.
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data_source:
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- Sysmon EventID 11
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search: '`sysmon` EventCode=11 process_name = "wermgr.exe" TargetFilename = "*.exe"
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| stats min(_time) as firstTime max(_time) as lastTime count by action dest file_name
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file_path process_guid process_id user_id vendor_product | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `wermgr_process_create_executable_file_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA. Tune and filter known instances of wermgr.exe may be used.
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known_false_positives: unknown
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references:
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- https://labs.vipre.com/trickbot-and-its-modules/
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- https://whitehat.eu/incident-response-case-study-featuring-ryuk-and-trickbot-part-2/
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Wermgr.exe writing executable files on $dest$
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risk_objects:
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- field: dest
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type: system
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score: 56
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threat_objects: []
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tags:
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analytic_story:
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- Trickbot
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asset_type: Endpoint
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mitre_attack_id:
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- T1027
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/trickbot/infection/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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