Potential Remote File Execution via MSIEXEC

Identifies the execution of the built-in Windows Installer, msiexec.exe, to install a remote package. Adversaries may abuse msiexec.exe to launch local or network accessible MSI files.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2023/09/28"
 3integration = ["endpoint"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/01/12"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies the execution of the built-in Windows Installer, msiexec.exe, to install a remote package. Adversaries may abuse
13msiexec.exe to launch local or network accessible MSI files.
14"""
15from = "now-9m"
16index = ["logs-endpoint.events.*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Potential Remote File Execution via MSIEXEC"
20risk_score = 21
21rule_id = "3e441bdb-596c-44fd-8628-2cfdf4516ada"
22severity = "low"
23tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Tactic: Defense Evasion", "Data Source: Elastic Defend"]
24type = "eql"
25
26query = '''
27sequence with maxspan=1m
28 [process where host.os.type == "windows" and event.action == "start" and
29    process.name : "msiexec.exe" and process.args : "/V"] by process.entity_id
30 [network where host.os.type == "windows" and process.name : "msiexec.exe" and
31    event.action == "connection_attempted"] by process.entity_id
32 [process where host.os.type == "windows" and event.action == "start" and
33  process.parent.name : "msiexec.exe" and user.id : ("S-1-5-21-*", "S-1-5-12-1-*") and
34  not process.executable : ("?:\\Windows\\SysWOW64\\msiexec.exe",
35                            "?:\\Windows\\System32\\msiexec.exe",
36                            "?:\\Windows\\System32\\srtasks.exe",
37                            "?:\\Windows\\SysWOW64\\srtasks.exe",
38                            "?:\\Windows\\System32\\taskkill.exe",
39                            "?:\\Windows\\Installer\\MSI*.tmp",
40                            "?:\\Program Files\\*.exe",
41                            "?:\\Program Files (x86)\\*.exe",
42                            "?:\\Windows\\System32\\ie4uinit.exe",
43                            "?:\\Windows\\SysWOW64\\ie4uinit.exe",
44                            "?:\\Windows\\System32\\sc.exe",
45                            "?:\\Windows\\system32\\Wbem\\mofcomp.exe",
46                            "?:\\Windows\\twain_32\\fjscan32\\SOP\\crtdmprc.exe",
47                            "?:\\Windows\\SysWOW64\\taskkill.exe",
48                            "?:\\Windows\\SysWOW64\\schtasks.exe",
49                            "?:\\Windows\\system32\\schtasks.exe",
50                            "?:\\Windows\\System32\\sdbinst.exe") and
51  not (process.code_signature.subject_name == "Citrix Systems, Inc." and process.code_signature.trusted == true) and
52  not (process.name : ("regsvr32.exe", "powershell.exe", "rundll32.exe", "wscript.exe") and
53       process.Ext.token.integrity_level_name == "high" and
54       process.args : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*")) and
55  not (process.executable : ("?:\\Program Files\\*.exe", "?:\\Program Files (x86)\\*.exe") and process.code_signature.trusted == true) and
56  not (process.name : "rundll32.exe" and process.args : "printui.dll,PrintUIEntry")
57  ] by process.parent.entity_id
58'''
59
60[[rule.threat]]
61framework = "MITRE ATT&CK"
62[[rule.threat.technique]]
63id = "T1566"
64name = "Phishing"
65reference = "https://attack.mitre.org/techniques/T1566/"
66[[rule.threat.technique.subtechnique]]
67id = "T1566.002"
68name = "Spearphishing Link"
69reference = "https://attack.mitre.org/techniques/T1566/002/"
70
71[rule.threat.tactic]
72id = "TA0001"
73name = "Initial Access"
74reference = "https://attack.mitre.org/tactics/TA0001/"
75
76[[rule.threat]]
77framework = "MITRE ATT&CK"
78[[rule.threat.technique]]
79id = "T1218"
80name = "System Binary Proxy Execution"
81reference = "https://attack.mitre.org/techniques/T1218/"
82[[rule.threat.technique.subtechnique]]
83id = "T1218.007"
84name = "Msiexec"
85reference = "https://attack.mitre.org/techniques/T1218/007/"
86
87
88
89[rule.threat.tactic]
90id = "TA0005"
91name = "Defense Evasion"
92reference = "https://attack.mitre.org/tactics/TA0005/"

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