Trojan.Win32.POWEXEC.AD

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:

• "%System%\cmd.exe" /k echo CreateObject("Wscript.Shell").Run "cmd /c cmd /c cmd /c powershell -ep bypass -f %User Temp%\ZXXDPNVJTEZXXDPNVJTEZXXDPNVJTEZXXDPNVJTEgkdfjoidfgdf.ps1", 0, False > %userprofile%\downloads\ZXXDPNVJTE.vbs& wscript %userprofile%\downloads\ZXXDPNVJTE.vbs& del %userprofile%\downloads\ZXXDPNVJTE.vbs
• wscript %User Profile%\downloads\ZXXDPNVJTE.vbs
• "%System%\cmd.exe" /c cmd /c cmd /c powershell -ep bypass -f %User Temp%\ZXXDPNVJTEZXXDPNVJTEZXXDPNVJTEZXXDPNVJTEgkdfjoidfgdf.ps1
• "%System%\reg.exe" add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ServiceDLL /t REG_SZ /d %Application Data%\OBU1ToYw\presentationhost.exe /f
• %Application Data%\OBU1ToYw\presentationhost.exe
• "%Application Data%\OBU1ToYw\GetUserLang.exe"

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

It creates the following folders:

• %AppDataLocal%\NetSupport\NetSupport Manager
• %User Profile%\AppData
• %System Root%\Users
• %AppDataLocal%\NetSupport
• %Application Data%\OBU1ToYw

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

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ServiceDLL = "%Application Data%\OBU1ToYw\presentationhost.exe"

Other System Modifications

This Trojan deletes the following folders:

• %User Temp%\nsa257B.tmp

(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).)

Dropping Routine

This Trojan drops the following files:

• %Application Data%\OBU1ToYw\presentationhost.exe
• %Application Data%\OBU1ToYw\NSM.ini
• %Application Data%\OBU1ToYw\NSM.lic
• %Application Data%\OBU1ToYw\TCCTL32.DLL
• %Application Data%\OBU1ToYw\pcicapi.dll
• %Application Data%\OBU1ToYw\nskbfltr.inf
• %User Profile%\downloads\ZXXDPNVJTE.vbs
• %User Temp%\ZXXDPNVJTEZXXDPNVJTEZXXDPNVJTEZXXDPNVJTEgkdfjoidfgdf.ps1
• %Application Data%\OBU1ToYw\HTCTL32.DLL
• %Application Data%\OBU1ToYw\client32.ini
• %Application Data%\OBU1ToYw\msvcr100.dll
• %Application Data%\OBU1ToYw\remcmdstub.exe
• %Application Data%\OBU1ToYw\PCICL32.DLL
• %Application Data%\OBU1ToYw\PCICHEK.DLL

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

Other Details

This Trojan connects to the following possibly malicious URL:

• http://www.{BLOCKED}oft.com/pki/certs/MicRooCerAut_2010-06-23.crt
• http://{BLOCKED}5.17.234:443/http://{BLOCKED}5.17.234/fakeurl.htm
• http://geo.{BLOCKED}portsoftware.com/location/loca.asp
• http://{BLOCKED}supdateservices.com

This report is generated via an automated analysis system.