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67 lines
3.0 KiB
YAML
67 lines
3.0 KiB
YAML
name: Linux Auditd Data Destruction Command
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id: 4da5ce1a-f71b-4e71-bb73-c0a3c73f3c3c
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version: 1
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date: '2024-09-04'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the execution of a Unix shell command
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designed to wipe root directories on a Linux host. It leverages data from Linux Auditd, focusing on the 'rm' command with force recursive deletion and the '--no-preserve-root' option. This activity is significant as it
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indicates potential data destruction attempts, often associated with malware like
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Awfulshred. If confirmed malicious, this behavior could lead to severe data loss,
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system instability, and compromised integrity of the affected Linux host. Immediate
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investigation and response are crucial to mitigate potential damage.
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data_source:
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- Linux Auditd Execve
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search: '`linux_auditd` `linux_auditd_normalized_execve_process` | rename host as
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dest | where LIKE (process_exec, "%rm %") AND LIKE (process_exec, "% -rf %") AND
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LIKE (process_exec, "%--no-preserve-root%") | stats count min(_time) as firstTime
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max(_time) as lastTime by argc process_exec dest | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`| `linux_auditd_data_destruction_command_filter`'
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how_to_implement: To implement this detection, the process begins by ingesting auditd
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data, that consist SYSCALL, TYPE, EXECVE and PROCTITLE events, which captures command-line
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executions and process details on Unix/Linux systems. These logs should be ingested
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and processed using Splunk Add-on for Unix and Linux (https://splunkbase.splunk.com/app/833),
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which is essential for correctly parsing and categorizing the data. The next step
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involves normalizing the field names to match the field names set by the Splunk
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Common Information Model (CIM) to ensure consistency across different data sources
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and enhance the efficiency of data modeling. This approach enables effective monitoring
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and detection of linux endpoints where auditd is deployed
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known_false_positives: unknown
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references:
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- https://cert.gov.ua/article/3718487
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- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/overview-of-the-cyber-weapons-used-in-the-ukraine-russia-war/
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tags:
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analytic_story:
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- Data Destruction
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- AwfulShred
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- Compromised Linux Host
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asset_type: Endpoint
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confidence: 90
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impact: 100
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message: A [$process_exec$] event occurred on host - [$dest$] to destroy data.
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mitre_attack_id:
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- T1485
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observable:
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- name: dest
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type: Endpoint
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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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- argc
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- process_exec
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risk_score: 90
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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/T1485/linux_auditd_no_preserve_root/linux_auditd_no_preserve_root.log
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source: /var/log/audit/audit.log
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sourcetype: linux:audit
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update_timestamp: true
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