Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 1,969,778 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 24 Aug 2010
Payload: Connects to URLs/Ips, Drops files

Arrival Details

This backdoor may be downloaded by other malware/grayware/spyware from remote sites.

It may be unknowingly downloaded by a user while visiting malicious websites.

However, as of this writing, the said sites are inaccessible.

Installation

This backdoor drops the following file(s)/component(s):

  • %User Temp%\{random}.exe - BKDR_REBHIP.A
  • %System%\temp\tempp.exe - BKDR_REBHIP.A

(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.. %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.)

It drops the following non-malicious files:

  • %User Temp%\{User name + random number}
  • %User Temp%\hahahaha.exe
  • %User Temp%\xxxyyyzzz.dat

(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.)

Download Routine

This backdoor accesses the following websites to download files:

  • hxxp://{BLOCKED}eesse.pytalhost.com/bse/sqlite3.dll

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It also attempts to connect to the IP address {BLOCKED}.223.56 on port 35567.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.406.15
VSAPI OPR PATTERN Date: 25 Aug 2010

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 process file/s detected as BKDR_REBHIP.A

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 3

Search and delete these files

[ 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%\{User name + random number}
%User Temp%\hahahaha.exe
%User Temp%\xxxyyyzzz.dat

Step 4

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