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

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Network Connection via Compiled HTML File

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Network Connection via Compiled HTML File

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Compiled HTML files (.chm) are commonly distributed as part of the Microsoft HTML Help system. Adversaries may conceal malicious code in a CHM file and deliver it to a victim for execution. CHM content is loaded by the HTML Help executable program (hh.exe).

Rule type: eql

Rule indices:

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

Severity: low

Risk score: 21

Runs every: 5 minutes

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

Maximum alerts per execution: 100

References:

https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml

Tags:

Elastic
Host
Windows
Threat Detection
Execution

Version: 8 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.14.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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sequence by process.entity_id [process where process.name : "hh.exe"
and event.type == "start"] [network where process.name : "hh.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")]

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Signed Binary Proxy Execution
- ID: T1218
- Reference URL: https://attack.mitre.org/techniques/T1218/

Rule version history

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Version 8 (7.14.0 release)

Updated query, changed from:

sequence by process.entity_id [process where process.name : "hh.exe"
and event.type == "start"] [network where process.name : "hh.exe"
and not cidrmatch(destination.ip, "10.0.0.0/8", "172.16.0.0/12",
"192.168.0.0/16")]

Version 7 (7.12.0 release)

Formatting only

Version 6 (7.11.0 release)

Formatting only

Version 5 (7.10.0 release)

Updated query, changed from:

event.category:network and event.type:connection and
process.name:hh.exe and not destination.ip:(10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16)

Version 4 (7.9.1 release)

Formatting only

Version 3 (7.9.0 release)

Updated query, changed from:

process.name:hh.exe and event.action:"Network connection detected
(rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16)

Version 2 (7.7.0 release)

Updated query, changed from:

process.name:hh.exe and event.action:"Network connection detected
(rule: NetworkConnect)" and not destination.ip:10.0.0.0/8 and not
destination.ip:172.16.0.0/12 and not destination.ip:192.168.0.0/16

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