Trojan.Win32.UPATRE.WLDG

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:

• %User Temp%\7z629C5BB0\thinprobe.exe
• %Windows%\pcawhere\thinprobe.exe
• %Windows%\pcawhere\thinprobe.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%\sc.exe start w32time task_started
• %System%\sdclt.exe /CONFIGNOTIFICATION
• taskhost.exe SYSTEM
• %System%\wsqmcons.exe
• taskhost.exe $(Arg0)
• %System%\svchost.exe -k LocalService
• %System%\svchost.exe -daemon
• %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.)

It creates the following folders:

• %Windows%\pcawhere
• %User Temp%\7z629C5BB0

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

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\pcAnywhere
ImagePath = "%Windows%\pcawhere\thinprobe.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\system-36071479
ImagePath = "%Windows%\pcawhere\thinprobe.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\pcAnywhere
ImagePath = "%Windows%\pcawhere\thinprobe.exe"

Other System Modifications

This Trojan deletes the following files:

• %User Temp%\7z629C5BB0\data.dat
• %User Temp%\7z629C5BB0\config.ini

(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).)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
Type = "272"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
DisplayName = "pcAnywhere Thin Host Probe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
WOW64 = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\pcAnywhere
Description = "pcAnywhere Thin Host Probe Service"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\system-36071479
DeleteFlag = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\system-36071479
Start = "4"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\NetworkList\
Nla\Cache\Intranet
{89BCDCB3-5725-45A2-94AB-2D6B641209B0} = "\x00PV\xbc\x079"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
cval = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\system-36071479
DisplayName = "system-36071479"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\system-36071479
Start = "SERVICE_AUTO_START"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\pcAnywhere
DisplayName = "pcAnywhere Thin Host Probe"

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

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\W32Time
Type = "16"

(Note: The default value data of the said registry entry is 20.)

Dropping Routine

This Trojan drops the following files:

• %User Temp%\7z629C5BB0\thinhostprobedll.dll
• %Windows%\pcawhere\config.ini
• %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
• %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
• {malware file path and name}
• %Windows%\pcawhere\thinhostprobedll.dll
• %User Temp%\7z629C5BB0\thumb.db
• %Windows%\pcawhere\thinprobe.exe
• %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
• %Windows%\pcawhere\thumb.db
• %User Temp%\7z629C5BB0\thinprobe.exe

(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.. %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). . %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:

• {BLOCKED}4.80.86

This report is generated via an automated analysis system.