mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
pyth0n1c
93 lines
3.2 KiB
YAML
93 lines
3.2 KiB
YAML
name: Windows InstallUtil Credential Theft
|
|
id: ccfeddec-43ec-11ec-b494-acde48001122
|
|
version: 3
|
|
date: '2022-08-25'
|
|
author: Michael Haag, Mauricio Velazo, Splunk
|
|
type: TTP
|
|
datamodel:
|
|
- Endpoint
|
|
description: 'The following analytic identifies the Windows InstallUtil.exe binary
|
|
loading `vaultcli.dll` and Samlib.dll`. This technique may be used to execute code
|
|
to bypassing application control and capture credentials by utilizing a tool like
|
|
MimiKatz. \
|
|
|
|
When `InstallUtil.exe` is used in a malicous manner, the path to an executable on
|
|
the filesystem is typically specified. Take note of the parent process. In a suspicious
|
|
instance, this will be spawned from a non-standard process like `Cmd.exe`, `PowerShell.exe`
|
|
or `Explorer.exe`. \
|
|
|
|
If used by a developer, typically this will be found with multiple command-line
|
|
switches/arguments and spawn from Visual Studio. \
|
|
|
|
During triage review resulting network connections, file modifications, and parallel
|
|
processes. Capture any artifacts and review further.'
|
|
search: '`sysmon` EventCode=7 parent_process_name=installutil.exe ImageLoaded IN ("*\\samlib.dll",
|
|
"*\\vaultcli.dll") | stats count min(_time) as firstTime max(_time) as lastTime
|
|
by Computer, parent_process_name, ImageLoaded, OriginalFileName, ProcessId | rename Computer
|
|
as dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
|
|
| `windows_installutil_credential_theft_filter`'
|
|
how_to_implement: To successfully implement this search, you need to be ingesting
|
|
logs with the process name, parent process, and module loads from your endpoints.
|
|
If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
|
|
known_false_positives: Typically this will not trigger as by it's very nature InstallUtil
|
|
does not need credentials. Filter as needed.
|
|
references:
|
|
- https://gist.github.com/xorrior/bbac3919ca2aef8d924bdf3b16cce3d0
|
|
tags:
|
|
analytic_story:
|
|
- Signed Binary Proxy Execution InstallUtil
|
|
confidence: 100
|
|
context:
|
|
- Source:Endpoint
|
|
- Stage:Defense Evasion
|
|
dataset:
|
|
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.004/atomic_red_team/windows-sysmon.log
|
|
impact: 80
|
|
kill_chain_phases:
|
|
- Exploitation
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest$ by user $user$ loading samlib.dll and vaultcli.dll to potentially
|
|
capture credentials in memory.
|
|
mitre_attack_id:
|
|
- T1218.004
|
|
- T1218
|
|
observable:
|
|
- name: user
|
|
type: User
|
|
role:
|
|
- Victim
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
- name: parent_process_name
|
|
type: Process
|
|
role:
|
|
- Parent Process
|
|
- name: process_name
|
|
type: Process
|
|
role:
|
|
- Child Process
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- Processes.dest
|
|
- Processes.user
|
|
- Processes.parent_process_name
|
|
- Processes.parent_process
|
|
- Processes.original_file_name
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.process_id
|
|
- Processes.parent_process_path
|
|
- Processes.process_path
|
|
- Processes.parent_process_id
|
|
risk_score: 80
|
|
security_domain: endpoint
|
|
supported_tas:
|
|
- Splunk_TA_microsoft_sysmon
|
|
asset_type: Endpoint
|