TROJ_MUMUBOY.C

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This Trojan may be dropped by other malware.

It logs a user's keystrokes to steal information.

  TECHNICAL DETAILS

File Size:

20,480 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Mar 2009

Payload:

Terminates processes, Steals information

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_MUMU.B

Installation

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

  • %Windows%\bboy.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It drops the following component file(s):

  • %System%\bboy.dll - same detection

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

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\Run
Kernel = "%Windows%\bboy.exe"

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • kvapfw.exe
  • kvfw.exe
  • DFVSNET.EXE
  • PasswordGuard.exe
  • EGhost.exe
  • Iparmor.exe
  • pfw.exe
  • mu.exe
  • main.exe

Dropping Routine

This Trojan drops the following file(s), which it uses for its keylogging routine:

  • qjinfo.ini

Information Theft

This Trojan logs a user's keystrokes to steal information.

NOTES:

It sends the file qjinfo.ini through an HTTP mail server, http://www.{BLOCKED}9.com using the following email format:

From: baby@{BLOCKED}8.com
To: terminal2000@{BLOCKED}3.com
BCC: cq@{BLOCKED}9.com

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_MUMUBOY.C

     WORM_MUMU.B

Step 3

Terminate the malware/grayware/spyware process:

[ Learn More ]
  • For Windows 98 and ME users, Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  • If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  • If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

    • 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
      • Kernel = "%Windows%\bboy.exe"

    Step 5

    Scan your computer with your Trend Micro product to delete files detected as TROJ_MUMUBOY.C. 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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