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T1574.001 DLL Search Order Hijacking

Adversaries may execute their own malicious payloads by hijacking the search order used to load DLLs. Windows systems use a common method to look for required DLLs to load into a program. 12 Hijacking DLL loads may be for the purpose of establishing persistence as well as elevating privileges and/or evading restrictions on file execution.

There are many ways an adversary can hijack DLL loads. Adversaries may plant trojan dynamic-link library files (DLLs) in a directory that will be searched before the location of a legitimate library that will be requested by a program, causing Windows to load their malicious library when it is called for by the victim program. Adversaries may also perform DLL preloading, also called binary planting attacks, 3 by placing a malicious DLL with the same name as an ambiguously specified DLL in a location that Windows searches before the legitimate DLL. Often this location is the current working directory of the program.4 Remote DLL preloading attacks occur when a program sets its current directory to a remote location such as a Web share before loading a DLL. 5

Adversaries may also directly modify the search order via DLL redirection, which after being enabled (in the Registry and creation of a redirection file) may cause a program to load a different DLL.678

If a search order-vulnerable program is configured to run at a higher privilege level, then the adversary-controlled DLL that is loaded will also be executed at the higher level. In this case, the technique could be used for privilege escalation from user to administrator or SYSTEM or from administrator to SYSTEM, depending on the program. Programs that fall victim to path hijacking may appear to behave normally because malicious DLLs may be configured to also load the legitimate DLLs they were meant to replace.

Item Value
ID T1574.001
Sub-techniques T1574.001, T1574.002, T1574.004, T1574.005, T1574.006, T1574.007, T1574.008, T1574.009, T1574.010, T1574.011, T1574.012, T1574.013
Tactics TA0003, TA0004, TA0005
Platforms Windows
Version 1.1
Created 13 March 2020
Last Modified 30 March 2023

Procedure Examples

ID Name Description
G0096 APT41 APT41 has used search order hijacking to execute malicious payloads, such as Winnti RAT.37
G0143 Aquatic Panda Aquatic Panda has used DLL search-order hijacking to load exe, dll, and dat files into memory.39
S0373 Astaroth Astaroth can launch itself via DLL Search Order Hijacking.18
G0135 BackdoorDiplomacy BackdoorDiplomacy has executed DLL search order hijacking.36
S0415 BOOSTWRITE BOOSTWRITE has exploited the loading of the legitimate Dwrite.dll file by actually loading the gdi library, which then loads the gdiplus library and ultimately loads the local Dwrite dll.20
S1063 Brute Ratel C4 Brute Ratel C4 has used search order hijacking to load a malicious payload DLL as a dependency to a benign application packaged in the same ISO.15
S0631 Chaes Chaes has used search order hijacking to load a malicious DLL.19
S0538 Crutch Crutch can persist via DLL search order hijacking on Google Chrome, Mozilla Firefox, or Microsoft OneDrive.29
S0134 Downdelph Downdelph uses search order hijacking of the Windows executable sysprep.exe to escalate privileges.33
S0363 Empire Empire contains modules that can discover and exploit various DLL hijacking opportunities.14
G0120 Evilnum Evilnum has used the malware variant, TerraTV, to load a malicious DLL placed in the TeamViewer directory, instead of the original Windows DLL located in a system folder.38
S0182 FinFisher A FinFisher variant uses DLL search order hijacking.2122
S0661 FoggyWeb FoggyWeb‘s loader has used DLL Search Order Hijacking to load malicious code instead of the legitimate version.dll during the Microsoft.IdentityServer.ServiceHost.exe execution process.28
S0009 Hikit Hikit has used DLL Search Order Hijacking to load oci.dll as a persistence mechanism.17
S0070 HTTPBrowser HTTPBrowser abuses the Windows DLL load order by using a legitimate Symantec anti-virus binary, VPDN_LU.exe, to load a malicious DLL that mimics a legitimate Symantec DLL, navlu.dll.27
S0260 InvisiMole InvisiMole can be launched by using DLL search order hijacking in which the wrapper DLL is placed in the same folder as explorer.exe and loaded during startup into the Windows Explorer process instead of the legitimate library.24
S0530 Melcoz Melcoz can use DLL hijacking to bypass security controls.18
G0045 menuPass menuPass has used DLL search order hijacking.35
S0280 MirageFox MirageFox is likely loaded via DLL hijacking into a legitimate McAfee binary.23
S0013 PlugX PlugX has the ability to use DLL search order hijacking for installation on targeted systems.32
S0194 PowerSploit PowerSploit contains a collection of Privesc-PowerUp modules that can discover and exploit DLL hijacking opportunities in services and processes.1213
S0113 Prikormka Prikormka uses DLL search order hijacking for persistence by saving itself as ntshrui.dll to the Windows directory so it will load before the legitimate ntshrui.dll saved in the System32 subdirectory.26
S0458 Ramsay Ramsay can hijack outdated Windows application dependencies with malicious versions of its own DLL payload.25
S0153 RedLeaves RedLeaves is launched through use of DLL search order hijacking to load a malicious dll.30
G0048 RTM RTM has used search order hijacking to force TeamViewer to load a malicious DLL.41
G0027 Threat Group-3390 Threat Group-3390 has performed DLL search order hijacking to execute their payload.40
G0131 Tonto Team Tonto Team abuses a legitimate and signed Microsoft executable to launch a malicious DLL.34
S0612 WastedLocker WastedLocker has performed DLL hijacking before execution.16
S0109 WEBC2 Variants of WEBC2 achieve persistence by using DLL search order hijacking, usually by copying the DLL file to %SYSTEMROOT% (C:\WINDOWS\ntshrui.dll).31
G0107 Whitefly Whitefly has used search order hijacking to run the loader Vcrodat.42

Mitigations

ID Mitigation Description
M1047 Audit Use auditing tools capable of detecting DLL search order hijacking opportunities on systems within an enterprise and correct them. Toolkits like the PowerSploit framework contain PowerUp modules that can be used to explore systems for DLL hijacking weaknesses.9
M1038 Execution Prevention Adversaries may use new DLLs to execute this technique. Identify and block potentially malicious software executed through search order hijacking by using application control solutions capable of blocking DLLs loaded by legitimate software.
M1044 Restrict Library Loading Disallow loading of remote DLLs. This is included by default in Windows Server 2012+ and is available by patch for XP+ and Server 2003+.

Detection

ID Data Source Data Component
DS0022 File File Creation
DS0011 Module Module Load

References

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