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WORM_REBHIP.CM

October 24, 2012
 Modified by: Michael Cabel
 ALIASES:

MICROSOFT (Worm:Win32/Rebhip.A);

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

534,699 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

16 Oct 2012

Payload:

Steals information, Connects to URLs/IPs

Arrival Details

This worm 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 worm drops the following non-malicious files:

  • %User Temp%\UuU.uUu
  • %User Temp%\XxX.xXx

(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, XP, and Server 2003.)

It drops the following copies of itself into the affected system:

  • %System%\Adobe Flash\Update.exe

(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 worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Policies = %System%\Adobe Flash\Update.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = %System%\Adobe Flash\Update.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{AS7B67H0-BT74-553R-G584-6IX3Q7VM5UTR}
StubPath = %System%\Adobe Flash\Update.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Policies = %System%\Adobe Flash\Update.exe

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • task.exe
  • system.exe
  • winbackup.exe
  • windows.exe
  • update.exe

Information Theft

This worm retrieves the following information from the affected system:

  • List of security softwares installed on the system
  • List of running processes
  • List of running services
  • Gather keystrokes

Stolen Information

This worm sends the gathered information via HTTP POST to the following URL:

  • {BLOCKED}y.{BLOCKED}d.me.uk

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.462.05

FIRST VSAPI PATTERN DATE:

16 Oct 2012

VSAPI OPR PATTERN File:

9.463.00

VSAPI OPR PATTERN Date:

16 Oct 2012

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

Terminate a malware/grayware process

[ Learn More ]

*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.

    %System%\Adobe Flash\Update.exe

Step 3

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
    • Policies = %System%\Adobe Flash\Update.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKCU = %System%\Adobe Flash\Update.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{AS7B67H0-BT74-553R-G584-6IX3Q7VM5UTR}
    • StubPath = %System%\Adobe Flash\Update.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • Policies = %System%\Adobe Flash\Update.exe

Step 4

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
%User Temp%\UuU.uUu
%User Temp%\XxX.xXx

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_REBHIP.CM. 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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