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64 lines
2.3 KiB
YAML
64 lines
2.3 KiB
YAML
name: Modification Of Wallpaper
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id: accb0712-c381-11eb-8e5b-acde48001122
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version: 1
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date: '2021-06-02'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This analytic identifies suspicious modification of registry to deface
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or change the wallpaper of a compromised machines as part of its payload. This technique
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was commonly seen in ransomware like REVIL where it create a bitmap file contain
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a note that the machine was compromised and make it as a wallpaper.
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search: '`sysmon` EventCode =13 (TargetObject= "*\\Control Panel\\Desktop\\Wallpaper"
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AND Image != "*\\explorer.exe") OR (TargetObject= "*\\Control Panel\\Desktop\\Wallpaper"
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AND Details = "*\\temp\\*") | stats count min(_time) as firstTime max(_time) as
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lastTime by EventCode Image TargetObject Details Computer process_guid process_id
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user_id | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `modification_of_wallpaper_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 Image, TargetObject registry key, registry Details from your endpoints.
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If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
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known_false_positives: 3rd party tool may used to changed the wallpaper of the machine
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references:
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- https://krebsonsecurity.com/2021/05/a-closer-look-at-the-darkside-ransomware-gang/
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- https://www.mcafee.com/blogs/other-blogs/mcafee-labs/mcafee-atr-analyzes-sodinokibi-aka-revil-ransomware-as-a-service-what-the-code-tells-us/
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tags:
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analytic_story:
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- Ransomware
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- Revil Ransomware
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automated_detection_testing: passed
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confidence: 90
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/revil/inf1/windows-sysmon.log
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impact: 60
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kill_chain_phases:
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- Exploitation
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message: Wallpaper modification on $dest$
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mitre_attack_id:
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- T1491
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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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- EventCode
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- Image
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- TargetObject
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- Details
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- Computer
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- process_guid
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- process_id
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- user_id
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risk_score: 54
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security_domain: endpoint
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