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P4T12ICK
69 lines
2.1 KiB
YAML
69 lines
2.1 KiB
YAML
name: 7zip CommandLine To SMB Share Path
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id: 01d29b48-ff6f-11eb-b81e-acde48001122
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version: 1
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date: '2021-08-17'
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author: Teoderick Contreras, Splunk
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status: production
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type: Hunting
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description: This search is to detect a suspicious 7z process with commandline pointing
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to SMB network share. This technique was seen in CONTI LEAK tools where it use 7z
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to archive a sensitive files and place it in network share tmp folder. This search
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is a good hunting query that may give analyst a hint why specific user try to archive
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a file pointing to SMB user which is un usual.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: 7z.exe
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selection2:
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Image|endswith:
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- 7z.exe
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- 7za.exe
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selection3:
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OriginalFileName: 7za.exe
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selection4:
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CommandLine:
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- '*\\C$\\*'
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- '*\\Admin$\\*'
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- '*\\IPC$\\*'
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condition: (selection1 or selection2 or selection3) and selection4
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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 where renamed 7z.exe may be used.
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known_false_positives: unknown
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references:
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- https://threadreaderapp.com/thread/1423361119926816776.html
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tags:
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analytic_story:
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- Ransomware
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: archive process $process_name$ with suspicious cmdline $process$ in host
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$dest$
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mitre_attack_id:
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- T1560.001
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- T1560
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: SourceImage
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type: Process
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role:
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- Attacker
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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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risk_score: 25
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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/conti/conti_leak/windows-sysmon_7z.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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