Potential Sudo Token Manipulation via Process Injection

 1[metadata]
 2creation_date = "2023/07/31"
 3integration = ["endpoint"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10This rule detects potential sudo token manipulation attacks through process injection by monitoring the use of a
11debugger (gdb) process followed by a successful uid change event during the execution of the sudo process. A sudo token
12manipulation attack is performed by injecting into a process that has a valid sudo token, which can then be used by
13attackers to activate their own sudo token. This attack requires ptrace to be enabled in conjunction with the existence
14of a living process that has a valid sudo token with the same uid as the current user.
15"""
16from = "now-9m"
17index = ["logs-endpoint.events.*"]
18language = "eql"
19license = "Elastic License v2"
20name = "Potential Sudo Token Manipulation via Process Injection"
21references = ["https://github.com/nongiach/sudo_inject"]
22risk_score = 47
23rule_id = "ff9bc8b9-f03b-4283-be58-ee0a16f5a11b"
24setup = """## Setup
25
26This rule requires data coming in from Elastic Defend.
27
28### Elastic Defend Integration Setup
29Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows the Elastic Agent to monitor events on your host and send data to the Elastic Security app.
30
31#### Prerequisite Requirements:
32- Fleet is required for Elastic Defend.
33- To configure Fleet Server refer to the [documentation](https://www.elastic.co/guide/en/fleet/current/fleet-server.html).
34
35#### The following steps should be executed in order to add the Elastic Defend integration on a Linux System:
36- Go to the Kibana home page and click "Add integrations".
37- In the query bar, search for "Elastic Defend" and select the integration to see more details about it.
38- Click "Add Elastic Defend".
39- Configure the integration name and optionally add a description.
40- Select the type of environment you want to protect, either "Traditional Endpoints" or "Cloud Workloads".
41- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. [Helper guide](https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html).
42- We suggest selecting "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions"
43- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead.
44For more details on Elastic Agent configuration settings, refer to the [helper guide](https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html).
45- Click "Save and Continue".
46- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts.
47For more details on Elastic Defend refer to the [helper guide](https://www.elastic.co/guide/en/security/current/install-endpoint.html).
48"""
49severity = "medium"
50tags = [
51    "Domain: Endpoint",
52    "OS: Linux",
53    "Use Case: Threat Detection",
54    "Tactic: Privilege Escalation",
55    "Data Source: Elastic Defend",
56]
57type = "eql"
58
59query = '''
60sequence by host.id, process.session_leader.entity_id with maxspan=15s
61[ process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and 
62  process.name == "gdb" and process.user.id != "0" and process.group.id != "0" ]
63[ process where host.os.type == "linux" and event.action == "uid_change" and event.type == "change" and 
64  process.name == "sudo" and process.user.id == "0" and process.group.id == "0" ]
65'''
66
67
68[[rule.threat]]
69framework = "MITRE ATT&CK"
70[[rule.threat.technique]]
71id = "T1055"
72name = "Process Injection"
73reference = "https://attack.mitre.org/techniques/T1055/"
74[[rule.threat.technique.subtechnique]]
75id = "T1055.008"
76name = "Ptrace System Calls"
77reference = "https://attack.mitre.org/techniques/T1055/008/"
78
79
80[[rule.threat.technique]]
81id = "T1548"
82name = "Abuse Elevation Control Mechanism"
83reference = "https://attack.mitre.org/techniques/T1548/"
84[[rule.threat.technique.subtechnique]]
85id = "T1548.003"
86name = "Sudo and Sudo Caching"
87reference = "https://attack.mitre.org/techniques/T1548/003/"
88
89
90
91[rule.threat.tactic]
92id = "TA0004"
93name = "Privilege Escalation"
94reference = "https://attack.mitre.org/tactics/TA0004/"