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patel-bhavin
71 lines
2.6 KiB
YAML
71 lines
2.6 KiB
YAML
name: Linux Sudoers Tmp File Creation
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id: be254a5c-63e7-11ec-89da-acde48001122
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version: 1
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date: '2021-12-23'
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author: Teoderick Contreras, Splunk
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type: Anomaly
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datamodel:
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- Endpoint
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description: This analytic is to looks for file creation of sudoers.tmp file cause
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by editing /etc/sudoers using visudo or editor in linux platform. This technique may abuse
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by adversaries, malware author and red teamers to gain elevated privilege to targeted
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or compromised host. /etc/sudoers file controls who can run what commands as what
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users on what machines and can also control special things such as whether you need
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a password for particular commands. The file is composed of aliases (basically variables)
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and user specifications (which control who can run what).
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.file_path IN ("*sudoers.tmp*")
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by Filesystem.dest Filesystem.file_name Filesystem.process_guid Filesystem.file_path
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| `drop_dm_object_name(Filesystem)` | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)`
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| `linux_sudoers_tmp_file_creation_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 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://forum.ubuntuusers.de/topic/sudo-visudo-gibt-etc-sudoers-tmp/
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tags:
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analytic_story:
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- Linux Privilege Escalation
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- Linux Persistence Techniques
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548.003/sudoers_temp/sysmon_linux.log
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kill_chain_phases:
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- Privilege Escalation
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mitre_attack_id:
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- T1548.003
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- T1548
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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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- Filesystem.dest
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- Filesystem.file_create_time
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- Filesystem.file_name
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- Filesystem.process_guid
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- Filesystem.file_path
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security_domain: endpoint
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impact: 80
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confidence: 90
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risk_score: 72
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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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message: A file $file_name$ is created in $file_path$ on $dest$
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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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nist:
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- DE.CM
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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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automated_detection_testing: passed
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