TR/Dldr.Nurech.BG - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Dldr.Nurech.BG
Type:	Trojan
Subtype:	Downloader
In the wild:	Yes
Reported Infections:	High
Distribution Potential:	Medium
Damage Potential:	Low
Static file:	Yes
File size:	23.552 Bytes
MD5 checksum:	041c6826efdea3f72b167ea7a535978c
VDF version:	6.38.00.223 - Tue, 17 Apr 2007 09:44 (GMT+1)
IVDF version:	6.38.00.227 - Tue, 17 Apr 2007 09:44 (GMT+1)

General Method of propagation:
   • No own spreading routine

Alias:
   • Mcafee: Downloader-AAP trojan
   • Kaspersky: Trojan-Downloader.Win32.Nurech.bg
   • TrendMicro: TROJ_DLOADER.HBH
   • F-Secure: Trojan-Downloader.Win32.Nurech.bg
   • Sophos: Troj/Clagger-BB
   • Eset: Win32/TrojanDownloader.Nurech.BG trojan
   • Bitdefender: Trojan.Downloader.Nurech.AI

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads files
   • Downloads a malicious file
   • Registry modification

Files It copies itself to the following location:
   • %SYSDIR%\iisca.exe

The following files are created:

– Non malicious files:
   • %SYSDIR%\DRIVERS\qias.tx
   • %temporary internet files%\im[1].txt

It tries to download a file:

– The location is the following:
   • http://knowledgecentral.co.uk**********/3.exe
It is saved on the local hard drive under: %SYSDIR%\3.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.BZub.IR

Registry The following registry key is added in order to run the process after reboot:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
• "gtydf"="iisca.exe"

See a brief description here.

Description inserted by Viktor Graeber on Tue, 17 Apr 2007 15:42 (GMT+1)
Description updated by Viktor Graeber on Wed, 18 Apr 2007 09:14 (GMT+1)

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