MUTOPY

Mutopy (also known as Rodecap) is a malware family of Trojans used to download other malware. It also randomizes the way it drops its copies so that anti-malware products will have difficulty in cleaning the affected system.

Installation

This Trojan drops the following copies of itself into the affected system:

• %AppDataLocal%\{filename}
• %Application Data%\{filename}
• %Application Data%\Microsoft\{filename}
• %ProgramData%\{filename}
• %System Root%\Users\All Users\{filename}
• %System Root%\Users\All Users\Microsoft\{filename}
• %System%\drivers\{filename}
• %User Profile%\AppData\Local\Microsoft\{filename}
• %User Profile%\Local Settings\Application Data\{filename}
• %User Profile%\Local Settings\Application Data\Microsoft\{filename}
• %User Temp%\{filename}
• %Windows%\{filename}
• %Windows%\System\{filename}

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %System Root% is the Windows root folder, where it usually is C:\ 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.. %User Profile% is a user's profile folder, where it usually is C:\Documents and Settings\{user name} on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name} on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops the following non-malicious file:

• %User Temp%\Twain002.Mtx

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

• %User Temp%\~NwcTemp
• %User Temp%\~NwcTemp\conh09

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
{value} = "{dropped copy}"

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
{value} = "{dropped copy}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
{value} = "{dropped copy}"

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
{value} = "{dropped copy}"

HKEY_CURRENT_USER\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Policies\Explorer\Run
{value} = "{dropped copy}"

HKEY_CURRENT_USER\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Policies\Explorer\Run
{value} = "{dropped copy}"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
{value} = "{dropped copy}"

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

Download Routine

This Trojan saves the files it downloads using the following names:

• %User Temp%\~NwcTemp\conh09\conhost.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}al.store-apps.org/d/conh09.jpg

NOTES:

The {filename} mentioned in the dropped copies may be the following:

• cisvc.exe
• clipsrv.exe
• cmstp.exe
• comrepl.exe
• csrss.exe
• dllhost.exe
• dllhst3g.exe
• esentutl.exe
• ieudinit.exe
• logman.exe
• mqtgsvc.exe
• mstinit.exe
• mstsc.exe
• rsvp.exe
• sessmgr.exe
• spoolsv.exe
• wininit.exe
• winlogon.exe

The {value} mentioned in the added registry entries may be the following:

• Cisvc
• ClipSrv
• CmSTP
• ComRepl
• DllHost3g
• DllHst
• Esent Utl
• IEudinit
• Logman
• Microsoft RSVP
• MqtgSVC
• MstInit
• Mstsc
• SessMgr
• Spool
• Spooler
• WinInit
• cisvc
• cisvc
• rsvp
• run