TrojanSpy.Win32.EMOTET.TIABOFHV

This Trojan Spy 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 Spy 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 Spy adds the following processes:

• {malware file path and name} --57e76357
• "%Windows%\SysWOW64\groupfill.exe"
• %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 Root%\Program Files\Windows Media Player\wmpnetwk.exe"
• %System%\svchost.exe -k WerSvcGroup
• %System%\svchost.exe -k LocalServiceNetworkRestricted
• %Windows%\SysWOW64\groupfill.exe --846b6c58

(Note: %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.)

It creates the following folders:

• %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft

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

Autostart Technique

This Trojan Spy 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\groupfill
ImagePath = "%Windows%\SysWOW64\groupfill.exe"

Other System Modifications

This Trojan Spy deletes the following files:

• %Windows%\SysWOW64\groupfill.exe:Zone.Identifier
• {malware file path and name}
• %Windows%\SysWOW64\markupcube.exe

(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\Microsoft\
Windows NT\CurrentVersion\NetworkList\
Nla\Cache\Intranet
{89BCDCB3-5725-45A2-94AB-2D6B641209B0} = "\x00PV\xbc\x0f"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\groupfill
Start = "SERVICE_AUTO_START"

Dropping Routine

This Trojan Spy drops the following files:

• %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
• %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
• %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
• %Windows%\SysWOW64\groupfill.exe

(Note: %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).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData 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.)

This report is generated via an automated analysis system.