Suspicious Memory grep Activity

 1[metadata]
 2creation_date = "2024/02/05"
 3integration = ["endpoint"]
 4maturity = "production"
 5updated_date = "2024/10/18"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Monitors for grep activity related to memory mapping. The /proc/*/maps file in Linux provides a memory map for a
11specific process, detailing the memory segments, permissions, and what files are mapped to these segments. Attackers may
12read a process's memory map to identify memory addresses for code injection or process hijacking.
13"""
14from = "now-9m"
15index = ["logs-endpoint.events.*", "endgame-*"]
16language = "eql"
17license = "Elastic License v2"
18name = "Suspicious Memory grep Activity"
19references = ["https://github.com/arget13/DDexec"]
20risk_score = 21
21rule_id = "d74d6506-427a-4790-b170-0c2a6ddac799"
22severity = "low"
23tags = [
24    "Domain: Endpoint",
25    "OS: Linux",
26    "Use Case: Threat Detection",
27    "Tactic: Discovery",
28    "Data Source: Elastic Defend",
29    "Data Source: Elastic Endgame",
30]
31timestamp_override = "event.ingested"
32type = "eql"
33query = '''
34process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event") and
35process.name in ("grep", "egrep", "fgrep", "rgrep") and process.args in ("[stack]", "[vdso]", "[heap]")
36'''
37
38[[rule.threat]]
39framework = "MITRE ATT&CK"
40
41[[rule.threat.technique]]
42id = "T1057"
43name = "Process Discovery"
44reference = "https://attack.mitre.org/techniques/T1057/"
45
46[rule.threat.tactic]
47id = "TA0007"
48name = "Discovery"
49reference = "https://attack.mitre.org/tactics/TA0007/"