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Microsoft IIS Service Account Password Dumped

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Microsoft IIS Service Account Password Dumped

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Identifies the Internet Information Services (IIS) command-line tool, AppCmd, being used to list passwords. An attacker with IIS web server access via a web shell can decrypt and dump the IIS AppPool service account password using AppCmd.

Rule type: eql

Rule indices:

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

Severity: high

Risk score: 73

Runs every: 5m

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

Maximum alerts per execution: 33

References:

https://blog.netspi.com/decrypting-iis-passwords-to-break-out-of-the-dmz-part-1/

Tags:

Elastic
Host
Windows
Threat Detection
Credential Access

Version: 7

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where event.type in ("start", "process_started") and
   (process.name : "appcmd.exe" or process.pe.original_file_name == "appcmd.exe") and
   process.args : "/list" and process.args : "/text*password"

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/

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