mirror of
https://github.com/splunk/security_content
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Bhavin Patel
64 lines
2.4 KiB
YAML
64 lines
2.4 KiB
YAML
name: Wermgr Process Create Executable File
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id: ab3bcce0-a105-11eb-973c-acde48001122
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version: 2
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date: '2024-05-23'
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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 Image TargetFilename
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process_name dest EventCode ProcessId | `security_content_ctime(firstTime)` | `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
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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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tags:
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analytic_story:
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- Trickbot
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asset_type: Endpoint
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confidence: 80
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impact: 70
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message: Wermgr.exe writing executable files on $dest$
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mitre_attack_id:
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- T1027
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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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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required_fields:
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- _time
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- Image
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- TargetFilename
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- process_name
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- dest
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- EventCode
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- ProcessId
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risk_score: 56
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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:
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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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