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Backdoor:Win32/Alcope.A

First posted on 30 March 2015.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Alcope.A.

Explanation :

Threat behavior

Installation
This threat can create files on your PC, including:

• %ALLUSERSPROFILE%\start menu\programs\startup\leanp.lnk
• %TEMP%\leanp.exe

It can make various registry changes during its installation, including:

In subkey: HKLM\software\classes\.htm\openwithlist\microsoft office publisher\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\mspub.exe" %1"

In subkey: HKLM\software\classes\.htm\openwithlist\microsoft office word\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\winword.exe" /n /dde"

In subkey: HKLM\software\classes\.mht\openwithlist\microsoft office excel\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\excel.exe" /e"

In subkey: HKLM\software\classes\.htm\openwithlist\microsoft office excel\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\excel.exe" /e"

In subkey: HKLM\software\classes\.mht\openwithlist\microsoft office publisher\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\mspub.exe" %1"

In subkey: HKLM\software\classes\.mht\openwithlist\microsoft office word\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\winword.exe" /n /dde"

In subkey: HKLM\software\classes\odccube.1\html handler\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o1 %1"

In subkey: HKLM\software\classes\odcdatabase.1\html handler\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o1 %1"

In subkey: HKLM\software\classes\powerpoint.slide.8\html handler\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o2 %1"

In subkey: HKLM\software\classes\word.document.8\html handler\shell\edit\command
Sets value: "(default)"
With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o0 %1"



Payload


Allows backdoor access and control

This threat can give a malicious hacker access and control of your PC. They can then perform a number of different actions, such as:

• Deleting files
• Downloading and running files
• Logging your keystrokes or stealing your sensitive data
• Modifying your system settings
• Running or stopping applications
• Spreading malware to other PCs
• Uploading files

Connects to a remote host

We have seen this threat connect to a remote host, including:

• www.d1010318.hosting-sv.jp using port 80

Malware can connect to a remote host to do any of the following:

• Check for an Internet connection
• Download and run files (including updates or other malware)
• Report a new infection to its author
• Receive configuration or other data
• Receive instructions from a malicious hacker
• Search for your PC location
• Upload information taken from your PC
• Validate a digital certificate

Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

• d10ab3dd12f7124d3d2ecc82b41225d2
• Local\Mso97SharedDg19211105606Mutex
• Local\Mso97SharedDg19521105606Mutex
• Local\Mso97SharedDg19531105606Mutex
• Local\Mso97SharedDg20321105606Mutex
• Local\MU_ACBPIDS08
• Local\Mutex_MSOSharedMem
• MSCTF.GCompartListMUTEX.DefaultS-1-5-21-1844237615-2111687655-839522115-500

It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.



This malware description was published using automated analysis of file SHA1 2a9f4a73cc58d62974980186f3c665045eba5070.

Symptoms

The following can indicate that you have this threat on your PC:

• You see a file similar to:
  • %ALLUSERSPROFILE%\start menu\programs\startup\leanp.lnk
  • %TEMP%\leanp.exe

• You see registry modifications such as:
  
  • In subkey: HKLM\software\classes\.htm\openwithlist\microsoft office excel\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\excel.exe" /e"
    
    
  • In subkey: HKLM\software\classes\.htm\openwithlist\microsoft office publisher\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\mspub.exe" %1"
    
    
  • In subkey: HKLM\software\classes\.htm\openwithlist\microsoft office word\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\winword.exe" /n /dde"
    
    
  • In subkey: HKLM\software\classes\.mht\openwithlist\microsoft office excel\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\excel.exe" /e"
    
    
  • In subkey: HKLM\software\classes\.mht\openwithlist\microsoft office publisher\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\mspub.exe" %1"
    
    
  • In subkey: HKLM\software\classes\.mht\openwithlist\microsoft office word\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\winword.exe" /n /dde"
    
    
  • In subkey: HKLM\software\classes\access.application.11\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o3 %1"
    
    
  • In subkey: HKLM\software\classes\clsid\{42042206-2d85-11d3-8cff-005004838597}\inprocserver32
    Sets value: "(default)"
    With data: "%ProgramFiles%\microsoft office\office11\msohev.dll"
    
    
  • In subkey: HKLM\software\classes\excel.sheet.8\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o1 %1"
    
    
  • In subkey: HKLM\software\classes\htmlfile\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" %1"
    
    
  • In subkey: HKLM\software\classes\htmlfile\shell\print\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /p %1"
    
    
  • In subkey: HKLM\software\classes\mhtmlfile\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" %1"
    
    
  • In subkey: HKLM\software\classes\mhtmlfile\shell\print\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /p %1"
    
    
  • In subkey: HKLM\software\classes\odccube.1\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o1 %1"
    
    
  • In subkey: HKLM\software\classes\odcdatabase.1\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o1 %1"
    
    
  • In subkey: HKLM\software\classes\powerpoint.slide.8\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o2 %1"
    
    
  • In subkey: HKLM\software\classes\publisher.document.11\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o5 %1"
    
    
  • In subkey: HKLM\software\classes\word.document.8\html handler\shell\edit\command
    Sets value: "(default)"
    With data: ""%ProgramFiles%\microsoft office\office11\msohtmed.exe" /o0 %1"
    
    

• The presence of a mutex such as:
  • d10ab3dd12f7124d3d2ecc82b41225d2
  • Local\Mso97SharedDg19211105606Mutex
  • Local\Mso97SharedDg19521105606Mutex
  • Local\Mso97SharedDg19531105606Mutex
  • Local\Mso97SharedDg20321105606Mutex
  • Local\MU_ACBPIDS08
  • Local\Mutex_MSOSharedMem
  • MSCTF.GCompartListMUTEX.DefaultS-1-5-21-1844237615-2111687655-839522115-500

Last update 30 March 2015

 

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