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BKDR_CHALCOL.A

October 09, 2012
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

20,496,384 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

04 Sep 2012

Payload:

Compromises system security, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download files
  • Execute files
  • Get URL to download
  • Perform remote shell
  • Remove itself from the system (delete self and remove autorun registry) and exit
  • Sleep

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://nec.{BLOCKED}4.com/a.php?id={random characters}
  • http://nec.{BLOCKED}4.com/b.php?id={random characters}
  • http://nec.{BLOCKED}4.com/c.php?id={random characters}
  • http://nec.{BLOCKED}4.com/d.php?id={random characters}
  • http://nec.{BLOCKED}4.com/e.php?id={random characters}
  • http://nec.{BLOCKED}4.com/f.php?id={random characters}
  • http://{BLOCKED}.{BLOCKED}.202.197/a.php?id={random characters}
  • http://{BLOCKED}.{BLOCKED}.202.197/b.php?id={random characters}
  • http://{BLOCKED}.{BLOCKED}.202.197/c.php?id={random characters}
  • http://{BLOCKED}.{BLOCKED}.202.197/d.php?id={random characters}
  • http://{BLOCKED}.{BLOCKED}.202.197/e.php?id={random characters}
  • http://{BLOCKED}.{BLOCKED}.202.197/f.php?id={random characters}
  • http://onlinejilu.4pu.com/rc/news1.asp

NOTES:

It saves the command it receives as %User Temp%\temps.ini.

It reports successful infection to its C&C server by sending the following information via HTTP GET:

  • Host name
  • IP address
  • Malware Flag
  • OS information
  • Proxy information
  • Virtual Machine information

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.370.02

FIRST VSAPI PATTERN DATE:

04 Sep 2012

VSAPI OPR PATTERN File:

9.371.00

VSAPI OPR PATTERN Date:

05 Sep 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

Remove the malware/grayware file that dropped/downloaded BKDR_CHALCOL.A

Step 3

Identify and terminate files detected as BKDR_CHALCOL.A

[ Learn More ]
  1. 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.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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%\temps.ini

Step 5

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