Threat Encyclopedia

HKTL_JPGDOWN.A

Malware type: Others

Aliases: VirTool.Win32.MS04-028.a (Kaspersky), HTool-Exp-MS04-028 (McAfee), Hacktool.JPEGDownload (Symantec), KIT/JPEGexploit.A (Avira), Troj/JpegBld-A (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

Low

Description: 

This hack tool creates a JPEG file (detected as EXPL_JPGDOWN.A), which exploits a vulnerability in Windows XP.

For more information about the said vulnerability, visit the following Microsoft Web page:

Complete description and clean instructions for the Trojan (JPEG file) can be found in the following Web site:

Upon execution, this hack tool displays the following dialogue box:

JPEG Downloader By [ATmaCA]

The Trojan dropped by this hack tool attempts to download and execute files from a URL, which a malicious user inputs in the dialogue box.

The default URL in the dialogue box is http://www.y<BLOCKED>rsi.com/sr.exe.

This hack tool also drops the file MYPICTURE.JPG in the current folder.

After execution of this hack tool, the following message is displayed:

"The Jpeg Server, has been created with your settings in the current directory."

The following strings can be found in the malware body:

JPEG Downloader V1.0
With this downloader you can create downloader server with *.jpg
extension.
Based on Buffer Overrun in JPEG Processing (GDI+) Could Allow
Code Execution (833987)
Using Generic win32 http download shellcode
Bug analized by eEye Digital Security (http://www.eeye.com)
Compilied 23/09/04
Copyright
2004 ProGroup Software, Inc.
Coded By ATmaCA
E-Mail:support@prohack.net
Web:http://www.prohack.net

It runs on Windows 95, 98, ME, NT, 2000, and XP.

For additional information about this threat, see:

Description created: Sep. 24, 2004 8:42:13 AM GMT -0800
Description updated: Sep. 24, 2004 9:35:12 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 7,664 Bytes (compressed);
28,672 Bytes (uncompressed)

Initial samples received on: Sep 24, 2004

Related toEXPL_JPGDOWN.A

Details:

This hack tool creates a JPEG file (detected as EXPL_JPGDOWN.A), which exploits a vulnerability in Windows XP.

For more information about the said vulnerability, visit the following Microsoft Web page:

Complete description and clean instructions for the Trojan (JPEG file) can be found in the following Web site:

Upon execution, this hack tool displays the following dialogue box:

JPEG Downloader By [ATmaCA]

The Trojan dropped by this hack tool, attempts to download and execute files from a URL a malicious user inputs in the dialogue box.

The default URL in the dialogue box is http://www.y<BLOCKED>rsi.com/sr.exe.

This hack tool also drops the file MYPICTURE.JPG in the current folder.

After execution of this hack tool, the following message is displayed:

"The Jpeg Server, has been created with your settings in the current directory."

The following strings can be found in the malware body:

JPEG Downloader V1.0
With this downloader you can create downloader server with *.jpg
extension.
Based on Buffer Overrun in JPEG Processing (GDI+) Could Allow
Code Execution (833987)
Using Generic win32 http download shellcode
Bug analized by eEye Digital Security (http://www.eeye.com)
Compilied 23/09/04
Copyright
2004 ProGroup Software, Inc.
Coded By ATmaCA
E-Mail:support@prohack.net
Web:http://www.prohack.net

 
 
 

Analysis by: Juan Cesar Cuevas


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.180.00

Pattern release date: Sep 24, 2004


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure sets.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as HKTL_JPGDOWN.A. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro�s free online virus scanner.


Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.

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