Backdoor.Win32.PTERODO.A

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

It deletes itself after execution.

Arrival Details

This Backdoor 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 Backdoor adds the following processes:

• ua.cmd
• %User Temp%\7ZSfx000.cmd
• taskkill /f /im Harvesterx64.exe
• ua.rar.exe -pe,k.lrbgbyljcjdcrbt;hbntufdyj
• "Harvesterx64.exe"
• %System%\PING.EXE ping 8.8.8.8
• %System%\DllHost.exe /Processid:{F9717507-6651-4EDB-BFF7-AE615179BCCF}
• %System%\svchost.exe -k netsvcs
• %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"
• schtasks /create /sc minute /mo 20 /tn "Google CrashReport update" /tr "%AppDataLocal%\Microsoft\Windows\Explorer\Harvesterx64.exe" /f

(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).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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).)

It creates the following folders:

• %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft
• %AppDataLocal%\Google\Chrome\Default\LocalStorage\USB\1E90000
• %AppDataLocal%\Google\Chrome\Default\LocalStorage
• %AppDataLocal%\Google\Chrome\Default\LocalStorage\USB
• %User Profile%\AppData
• %AppDataLocal%\Google\Chrome
• %AppDataLocal%\Google
• %User Temp%\7ZipSfx.000
• %System Root%\Users
• %AppDataLocal%\Google\Chrome\Default

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

Other System Modifications

This Backdoor deletes the following files:

• %Windows%\Tasks\Google CrashReport update.job

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

It modifies the following registry entries:

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

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

Dropping Routine

This Backdoor drops the following files:

• %All Users Profile%\Microsoft\Network\Downloader\qmgr1.dat
• %AppDataLocal%\Microsoft\Windows\cache32.bins
• %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
• %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
• %AppDataLocal%\Microsoft\Windows\Explorer\Harvesterx64.exe
• %User Temp%\7ZipSfx.000\dux.cmd
• %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
• %User Temp%\7ZipSfx.000\ua.cmd
• %User Temp%\7ZipSfx.000\Harvesterx64.exe
• %User Temp%\7ZipSfx.000\dux.rar
• %All Users Profile%\Microsoft\Network\Downloader\qmgr0.dat
• %User Temp%\7ZipSfx.000\ua.rar
• %User Temp%\7ZSfx000.cmd
• %User Temp%\7ZipSfx.000\ua.rar.exe

(Note: %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).. %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 Backdoor connects to the following possibly malicious URL:

• {BLOCKED}224.6
• {BLOCKED}.23.116
• {BLOCKED}.194.168
• {BLOCKED}.53.63
• {BLOCKED}.20.226

It deletes itself after execution.

This report is generated via an automated analysis system.