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Aliases: Trojan:Win32/Comame(Microsoft)
Malware type: Backdoor
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: No
In the wild: Yes


Infection Channel: Dropped by other malware

This backdoor is the detection for malicious attachments in email messages that spoof the 2013 G20 Summit in Russia. Users with systems affected by this malware may find their personal information stolen and the security of their systems compromised.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system.

It deletes itself after execution.

Technical Details

File size: 41,998 bytes
File type: EXE
Memory resident: Yes
Initial samples received date: 21 Aug 2013
Payload: Steals information, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:



This backdoor drops the following copies of itself into the affected system and executes them:

  • %Application Data%\svchost.exe
  • %ProgramData%\winupsvc.exe (for OS versions Windows Vista and higher)

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This is usually C:\ProgramData in Windows Vista and 7, or C:\Program Files on Windows 2000, XP (32-bit), and Server 2003, or C:\Program Files (x86) on Windows XP (64-bit).)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • c02b5fb4

Autostart Technique

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

Internet Explorer = "%Application Data%\svchost.exe"

Internet Explorer = "%ProgramData%\winupsvc.exe" (for OS versions Windows Vista and higher)

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and install plugin
  • Uninstall itself
  • Log off
  • Restart the system

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.241.110:80
  • {BLOCKED}.{BLOCKED}.153.157:443
  • {BLOCKED}.{BLOCKED}.153.157:8080

Information Theft

This backdoor gathers the following data:

  • Host Name
  • OS Version
  • Local IP Address
  • User Name

Other Details

This backdoor deletes itself after execution.


This backdoor queries the following registry entry to check the installed operating system:



Minimum scan engine: 9.300
First VSAPI Pattern File: 10.230.03
First VSAPI Pattern Release Date: 21 Aug 2013
VSAPI OPR Pattern Version: 10.231.00
VSAPI OPR Pattern Release Date: 22 Aug 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file that dropped/downloaded BKDR_SISPROC.A

Step 3

Restart in Safe Mode

[ Learn more ]

Step 4

Delete this registry value

[ Learn more ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Internet Explorer = "%Application Data%\svchost.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Internet Explorer = "%ProgramData%\winupsvc.exe"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_SISPROC.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

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Analysis By: Rika Joi Gregorio

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