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Eric McGinnis
59 lines
3.2 KiB
YAML
59 lines
3.2 KiB
YAML
name: Wermgr Process Create Executable File
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id: ab3bcce0-a105-11eb-973c-acde48001122
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version: 11
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creation_date: '2021-04-26'
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modification_date: '2026-05-13'
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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 file. It leverages Sysmon EventCode 11 to identify instances where wermgr.exe generates a .exe file. This behavior is unusual because wermgr.exe is typically associated with error reporting, not file creation. Such activity is significant as it may indicate TrickBot malware, which injects code into wermgr.exe to execute malicious actions like downloading additional payloads. If confirmed malicious, this could 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: |-
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`sysmon` EventCode=11 process_name = "wermgr.exe" TargetFilename = "*.exe"
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| stats min(_time) as firstTime max(_time) as lastTime count
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BY action dest file_name
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file_path process_guid process_id
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user_id vendor_product
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `wermgr_process_create_executable_file_filter`
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how_to_implement: To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. Tune and filter known instances of wermgr.exe may be used.
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known_false_positives: No false positives have been identified at this time.
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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 ("$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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finding:
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title: Wermgr.exe writing executable files on $dest$
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entity:
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field: dest
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type: system
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score: 50
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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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category: endpoint
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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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test_type: unit
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