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P4T12ICK
63 lines
2.2 KiB
YAML
63 lines
2.2 KiB
YAML
name: Write Executable in SMB Share
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id: f63c34fe-a435-11eb-935a-acde48001122
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version: 1
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date: '2021-04-23'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This search is to detect suspicious dropping or creating an executable
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file in known sensitive SMB share. This technique is commonly used for lateral movement
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like how trickbot try to infect other machine in the infected network. This detection
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catch the access event (FILE WRITE) access to a share.
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search: '`wineventlog_security` EventCode=5145 Relative_Target_Name IN ("*.exe","*.dll")
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Object_Type=File Share_Name IN ("\\\\*\\C$","\\\\*\\IPC$","\\\\*\\admin$") Access_Mask=
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"0x2" | stats min(_time) as firstTime max(_time) as lastTime count by EventCode
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Share_Name Relative_Target_Name Object_Type Access_Mask user src_port Source_Address
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `write_executable_in_smb_share_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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Windows Security Event Logs with 5145 EventCode enabled. The Windows TA is also
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required. Also enable the object Audit access success/failure in your group policy.
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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://blog.whitehat.eu/2019/05/incident-trickbot-ryuk-2.html
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tags:
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analytic_story:
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- Trickbot
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automated_detection_testing: passed
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confidence: 100
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context:
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- Source:Endpoint
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- Stage:Lateral Movement
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/trickbot/exe_smbshare/windows-security.log
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impact: 70
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kill_chain_phases:
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- Lateral Movement
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message: $user$ dropped or created an executable file in known sensitive SMB share. Share
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name=$Share_Name$, Target name=$Relative_Target_Name$, and Access mask=$Access_Mask$
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mitre_attack_id:
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- T1021.002
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observable:
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- name: user
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type: User
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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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- Share_Name
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- Relative_Target_Name
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- Object_Type
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- Access_Mask
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- user
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- src_port
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- Source_Address
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risk_score: 70
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security_domain: endpoint
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