Potential Sudo Token Manipulation via Process Injectionedit
This rule detects potential sudo token manipulation attacks through process injection by monitoring the use of a debugger (gdb) process followed by a successful uid change event during the execution of the sudo process. A sudo token manipulation attack is performed by injecting into a process that has a valid sudo token, which can then be used by attackers to activate their own sudo token. This attack requires ptrace to be enabled in conjunction with the existence of a living process that has a valid sudo token with the same uid as the current user.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Privilege Escalation
- Data Source: Elastic Defend
Version: 4
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule queryedit
sequence by host.id, process.session_leader.entity_id with maxspan=15s [ process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and process.name == "gdb" and process.user.id != "0" and process.group.id != "0" ] [ process where host.os.type == "linux" and event.action == "uid_change" and event.type == "change" and process.name == "sudo" and process.user.id == "0" and process.group.id == "0" ]
Framework: MITRE ATT&CKTM
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Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
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Technique:
- Name: Process Injection
- ID: T1055
- Reference URL: https://attack.mitre.org/techniques/T1055/
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Sub-technique:
- Name: Ptrace System Calls
- ID: T1055.008
- Reference URL: https://attack.mitre.org/techniques/T1055/008/
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Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/
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Sub-technique:
- Name: Sudo and Sudo Caching
- ID: T1548.003
- Reference URL: https://attack.mitre.org/techniques/T1548/003/