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tccontre
76 lines
2.8 KiB
YAML
76 lines
2.8 KiB
YAML
name: Linux Shred Overwrite Command
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id: c1952cf1-643c-4965-82de-11c067cbae76
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version: 1
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date: '2022-04-22'
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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 analytic is to detect a shred process to overwrite a files in a linux machine.
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Shred Linux application is designed to overwrite file to hide its contents or make the deleted file un-recoverable.
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Weve seen this technique in industroyer2 malware that tries to wipe energy facilities of targeted sector as part of its destructive attack.
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It might be some normal user may use this command for valid purposes but it is recommended to check what files, disk or folder it tries to shred
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that might be good pivot for incident response in this type of destructive malware.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where Processes.process_name =shred AND Processes.process IN ("*-n*", "*-u*", "*-z*", "*-s*")
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by Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id Processes.process_guid Processes.dest Processes.user
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `linux_shred_overwrite_command_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 can use the Add-on for Linux Sysmon from
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Splunkbase.
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known_false_positives: Administrator or network operator can use this application
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for automation purposes. Please update the filter macros to remove false positives.
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references:
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- https://www.welivesecurity.com/2022/04/12/industroyer2-industroyer-reloaded/
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- https://cert.gov.ua/article/39518
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tags:
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analytic_story:
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- Industroyer2
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- Linux Privilege Escalation
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- Linux Persistence Techniques
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- AwfulShred
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asset_type: Endpoint
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Privilege Escalation
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- Stage:Persistence
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1485/rm_shred_critical_dir/sysmon_linux.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: A possible shred overwrite command $process$ executed on $dest$
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mitre_attack_id:
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- T1485
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nist:
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- DE.CM
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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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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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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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risk_score: 49
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security_domain: endpoint
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