MsXsl Making Network Connections

 1[metadata]
 2creation_date = "2020/09/02"
 3integration = ["endpoint", "windows"]
 4maturity = "development"
 5updated_date = "2023/06/22"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies MsXsl.exe making outbound network connections. This may indicate adversarial activity as MsXsl is often
11leveraged by adversaries to execute malicious scripts and evade detection.
12"""
13from = "now-9m"
14index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*"]
15language = "eql"
16license = "Elastic License v2"
17name = "MsXsl Making Network Connections"
18risk_score = 47
19rule_id = "870d1753-1078-403e-92d4-735f142edcca"
20severity = "medium"
21tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Defend"]
22type = "eql"
23
24query = '''
25/* duplicate of Network Connection via MsXsl - b86afe07-0d98-4738-b15d-8d7465f95ff5 */
26
27sequence by process.entity_id
28  [process where host.os.type == "windows" and event.type == "start" and process.name : "msxsl.exe"]
29  [network where host.os.type == "windows" and process.name : "msxsl.exe" and network.direction : ("outgoing", "egress")]
30'''
31
32
33[[rule.threat]]
34framework = "MITRE ATT&CK"
35[[rule.threat.technique]]
36id = "T1220"
37name = "XSL Script Processing"
38reference = "https://attack.mitre.org/techniques/T1220/"
39
40
41[rule.threat.tactic]
42id = "TA0005"
43name = "Defense Evasion"
44reference = "https://attack.mitre.org/tactics/TA0005/"