IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Unusual Process Execution Path - Alternate Data Stream Unusual Network Connection via RunDLL32 »

› ›

Unusual Network Connection via DllHost

edit

Unusual Network Connection via DllHost

edit

Identifies unusual instances of dllhost.exe making outbound network connections. This may indicate adversarial Command and Control activity.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion

Version: 104

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

sequence by host.id, process.entity_id with maxspan=1m
  [process where host.os.type == "windows" and event.type == "start" and process.name : "dllhost.exe" and process.args_count == 1]
  [network where host.os.type == "windows" and process.name : "dllhost.exe" and
   not cidrmatch(destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24",
    "192.0.0.0/29", "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24",
    "192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10",
    "192.175.48.0/24", "198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1", "FE80::/10",
    "FF00::/8")]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: System Binary Proxy Execution
- ID: T1218
- Reference URL: https://attack.mitre.org/techniques/T1218/

« Unusual Process Execution Path - Alternate Data Stream Unusual Network Connection via RunDLL32 »