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P4T12ICK
63 lines
2.1 KiB
YAML
63 lines
2.1 KiB
YAML
name: Linux Deletion of SSL Certificate
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id: 839ab790-a60a-4f81-bfb3-02567063f615
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version: 1
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date: '2022-04-12'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: This analytic is to detect a deletion of ssl certificate in a linux machine.
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attacker may delete or modify ssl certificate to impair some security features or
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act as defense evasion in compromised linux machine. This Anomaly can be also a
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good indicator of a malware trying to wipe or delete several files in a compromised
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host as part of its destructive payload like what acidrain malware does in linux
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or router machines. This detection can be a good pivot to check what process and
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user tries to delete this type of files which is not so common and need further
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investigation.
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data_source:
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- Sysmon Event ID 11
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search:
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selection1:
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TargetFilename: /etc/ssl/certs/*
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Filesystem.action: deleted
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selection2:
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TargetFilename:
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- '*.pem'
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- '*.crt'
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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 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 execute this command.
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Please update the filter macros to remove false positives.
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references:
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- https://www.sentinelone.com/labs/acidrain-a-modem-wiper-rains-down-on-europe/
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tags:
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analytic_story:
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- Acidrain
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asset_type: endpoint
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confidence: 70
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impact: 70
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message: a $process_name$ deleting a SSL certificate in $dest$
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mitre_attack_id:
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- T1485
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- T1070.004
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- T1070
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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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risk_score: 49
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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/acidrain/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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