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P4T12ICK
82 lines
2.6 KiB
YAML
82 lines
2.6 KiB
YAML
name: Possible Browser Pass View Parameter
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id: 8ba484e8-4b97-11ec-b19a-acde48001122
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version: 1
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date: '2021-11-22'
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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 analytic will detect if a suspicious process contains a commandline
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parameter related to a web browser credential dumper. This technique is used by
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Remcos RAT malware which uses the Nirsoft webbrowserpassview.exe application to
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dump web browser credentials. Remcos uses the "/stext" command line to dump the
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credentials in text format. This Hunting query is a good indicator of hosts suffering
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from possible Remcos RAT infection. Since the hunting query is based on the parameter
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command and the possible path where it will save the text credential information,
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it may catch normal tools that are using the same command and behavior.
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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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CommandLine:
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- '*\\temp\\*'
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- '*\\users\\public\\*'
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- '*\\programdata\\*'
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selection2:
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CommandLine:
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- '*/stext *'
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- '*/shtml *'
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- '*/LoadPasswordsIE*'
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- '*/LoadPasswordsFirefox*'
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- '*/LoadPasswordsChrome*'
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- '*/LoadPasswordsOpera*'
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- '*/LoadPasswordsSafari*'
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- '*/UseOperaPasswordFile*'
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- '*/OperaPasswordFile*'
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- '*/stab*'
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- '*/scomma*'
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- '*/stabular*'
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- '*/shtml*'
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- '*/sverhtml*'
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- '*/sxml*'
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- '*/skeepass*'
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condition: selection1 and selection2
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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.
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known_false_positives: False positive is quite limited. Filter is needed
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references:
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- https://www.nirsoft.net/utils/web_browser_password.html
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- https://app.any.run/tasks/df0baf9f-8baf-4c32-a452-16562ecb19be/
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tags:
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analytic_story:
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- Remcos
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asset_type: Endpoint
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confidence: 40
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impact: 40
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message: suspicious process $process_name$ contains commandline $process$ on $dest$
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mitre_attack_id:
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- T1555.003
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- T1555
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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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- name: dest
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type: Hostname
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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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risk_score: 16
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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/attack_techniques/T1555/web_browser_pass_view/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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