Suspicious Managed Code Hosting Process

 1[metadata]
 2creation_date = "2020/08/21"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/03/08"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies a suspicious managed code hosting process which could indicate code injection or other form of suspicious
13code execution.
14"""
15from = "now-9m"
16index = ["winlogbeat-*", "logs-endpoint.events.file-*", "logs-windows.sysmon_operational-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Suspicious Managed Code Hosting Process"
20references = ["http://web.archive.org/web/20230329154538/https://blog.menasec.net/2019/07/interesting-difr-traces-of-net-clr.html"]
21risk_score = 73
22rule_id = "acf738b5-b5b2-4acc-bad9-1e18ee234f40"
23severity = "high"
24tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Defend", "Data Source: Sysmon"]
25timestamp_override = "event.ingested"
26type = "eql"
27
28query = '''
29file where host.os.type == "windows" and event.type != "deletion" and
30  file.name : ("wscript.exe.log",
31               "cscript.exe.log",
32               "mshta.exe.log",
33               "wmic.exe.log",
34               "svchost.exe.log",
35               "dllhost.exe.log",
36               "cmstp.exe.log",
37               "regsvr32.exe.log")
38'''
39
40
41[[rule.threat]]
42framework = "MITRE ATT&CK"
43[[rule.threat.technique]]
44id = "T1055"
45name = "Process Injection"
46reference = "https://attack.mitre.org/techniques/T1055/"
47
48
49[rule.threat.tactic]
50id = "TA0005"
51name = "Defense Evasion"
52reference = "https://attack.mitre.org/tactics/TA0005/"