Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

  TECHNICAL DETAILS

File Size: 226,065 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 29 Sep 2010
Payload: Drops files

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Application Data\Microsoft\imipapi.exe - detected as TROJ_AGENTT.DRP
  • %User Temp%\vmreg.dll - detected as BKDR_CHALCOL.BC

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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 executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

Other Details

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

  • %User Temp%\10.2 ‘S‘‘–¯“ˆês“®ˆÄ“à.pdf - non-malicious file

(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 is a zero-day exploit for the following vulnerability:

  • Adobe Reader 9.3.4 and earlier versions for Windows, Macintosh and UNIX (CVE-2010-2883)
  • Adobe Acrobat 9.3.4 and earlier versions for Windows and Macintosh (CVE-2010-2883)

More information on this vulnerability can be found below:

  SOLUTION

Minimum Scan Engine: 8.900

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_PIDIEF.DRP

    TROJ_AGENTT.DRP
    BKDR_CHALCOL.BC

Step 3

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%\10.2 ‘S‘‘–¯“ˆês“®ˆÄ“à.pdf

Step 4

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

Step 5

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

http://www.adobe.com/support/security/bulletins/apsb10-21.html


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