Analysis by: Wilbert Vidal
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It deletes itself after execution.

  TECHNICAL DETAILS

Memory Resident: Yes

Arrival Details

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

Dropping Routine

This Backdoor drops the following files:

  • %Program Files%\Common Files\App\Lib\ms{random}.exe
  • %Program Files%\Common Files\App\Lib\{random}sid.dat
  • %Program Files%\Common Files\System\Library\ms{random}.exe
  • %Program Files%\Common Files\System\Library\{random}sid.dat
  • %Program Files%\Common Files\System\ms{random}.exe
  • %System%\ms{random}.exe
  • %System%\{random}sid.dat

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.105.3/rf14c/addr.gif
  • http://{BLOCKED}.{BLOCKED}.105.3/rf14c/gixce.asp
  • http://{BLOCKED}.{BLOCKED}.105.3/rf14c/xnmbb.asp
  • http://{BLOCKED}.{BLOCKED}heya.com/css/fullite/foc.gif
  • http://{BLOCKED}.{BLOCKED}mice.com/image/logom.gif
  • http://{BLOCKED}.{BLOCKED}oala.com/img/addr.gif
  • http://{BLOCKED}.{BLOCKED}ifoum.com/web/images/addr.gif
  • http://{BLOCKED}.{BLOCKED}mice.com/view/addr.gif
  • http://{BLOCKED}.{BLOCKED}dorama.com/dlsearch/skm/addr.gif
  • http://{BLOCKED}.{BLOCKED}dorama.com/index.html
  • http://{BLOCKED}.{BLOCKED}domains.com/images/logo_huge_domains.gif
  • http://{BLOCKED}.{BLOCKED}zoo.com/images/addr.gif
  • http://{BLOCKED}.{BLOCKED}zoo.com/index.html

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 9.850

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete this file

[ Learn More ]
There may be some 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.  
  • %Program Files%\Common Files\App\Lib\ms{random}.exe
  • %Program Files%\Common Files\App\Lib\{random}sid.dat
  • %Program Files%\Common Files\System\Library\ms{random}.exe
  • %Program Files%\Common Files\System\Library\{random}sid.dat
  • %Program Files%\Common Files\System\ms{random}.exe
  • %System%\ms{random}.exe
  • %System%\{random}sid.dat

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_DASERF. 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 the following Trend Micro Support pages for more information:


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