Trojan.Win32.MIMIKATZ.AEI

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following processes:

• cmd.exe /c %User Temp%\mimikatz.exe privilege::debug sekurlsa::logonpasswords exit >%User Temp%\Pass.txt
• %Windows%\SysWOW64\svchost.exe -k GraphicsPerfSvcsGroup
• %Windows%\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe
• %System%\svchost.exe -k LocalServiceAndNoImpersonation
• %Windows%\Microsoft.NET\Framework64\v4.0.30319\mscorsvw.exe
• %System%\sppsvc.exe
• %System%\svchost.exe -k WerSvcGroup
• "%System Root%\Program Files\Windows Media Player\wmpnetwk.exe"
• %System%\svchost.exe -k NetworkService
• %System%\wsqmcons.exe
• taskhost.exe $(Arg0)
• %System%\svchost.exe
• %User Temp%\mimikatz.exe %User Temp%\mimikatz.exe privilege::debug sekurlsa::logonpasswords exit
• %System%\schtasks.exe /delete /f /TN "Microsoft\Windows\Customer Experience Improvement Program\Uploader"

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\GraphicsPerfSvcs
ImagePath = "%SystemRoot%\System32\svchost.exe -k GraphicsPerfSvcsGroup"

Other System Modifications

This Trojan deletes the following files:

• %Windows%\LastGood.Tmp

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows NT\CurrentVersion\
Svchost
GraphicsPerfSvcsGroup = "\x00"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\GraphicsPerfSvcs
Description = "Graphics performance monitor services."

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\GraphicsPerfSvcs\Parameters
ServiceDll = "%Application Data%\GraphicsPerfSvcs.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
RunExec = "{malware file path and name}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows Defender
DisableAntiSpyware = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\SecurityProviders\WDigest
UseLogonCredential = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Win_Svc
MarkTime = "2020-01-28 04:49"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\GraphicsPerfSvcs
DisplayName = "GraphicsPerfSvcs"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\GraphicsPerfSvcs
Start = "SERVICE_DEMAND_START"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\ShellHWDetection
DependOnService = "\x00\x00"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This Trojan drops the following files:

• %User Temp%\mimikatz.exe
• %Application Data%\graphicsperfsvcs.dllNew
• %User Temp%\Pass.txt
• %Application Data%\graphicsperfsvcs.dll
• %User Temp%\mimidrv.sys
• %User Temp%\mimilib.dll
• %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
• %Application Data%\graphicsperfsvcs.dllbak
• %Application Data%\GraphicsPerfSvcs.dll

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://ssh.{BLOCKED}i.com

This report is generated via an automated analysis system.