Virus: TR/Dldr.Small.bws Date discovered: 10/01/2006 Type: Trojan Subtype: Downloader In the wild: No Reported Infections: Low Distribution Potential: Low Damage Potential: Low to medium Static file: Yes File size: 3.829 Bytes MD5 checksum: 3bfdf9916546db9a570302286d583af7
General Method of propagation: • No own spreading routine Aliases: • Symantec: Download.Trojan • Kaspersky: Trojan-Downloader.Win32.Small.bws • TrendMicro: TROJ_SMALL.AWD • Bitdefender: Trojan.Downloader.BeHappy.B Platforms / OS: • Windows 95 • Windows 98 • Windows 98 SE • Windows NT • Windows ME • Windows 2000 • Windows XP • Windows 2003 Side effects: • Downloads malicious files Files It tries to download some files: – The location is the following: • http://tool**********.biz/progs/kl.txt It is saved on the local hard drive under: %WINDIR% \kl.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.Small.DG.8 – The location is the following: • http://tool**********.biz/progs/tool2.txt It is saved on the local hard drive under: %WINDIR% \tool2.exe Furthermore this file gets executed after it was fully downloaded. Detected as: TR/Killav.DB.2 – The location is the following: • http://tool**********.biz/progs/toolbar.txt It is saved on the local hard drive under: %WINDIR% \toolbar.exe Furthermore this file gets executed after it was fully downloaded. Detected as: TR/Dldr.Adload.J.14 – The location is the following: • http://tool**********.biz/progs/tool1.txt It is saved on the local hard drive under: %WINDIR% \tool2.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Killav.DB.2 – The location is the following: • http://tool**********.biz/progs/tool3.txt It is saved on the local hard drive under: %WINDIR% \tool3.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Killav.DB.2 – The location is the following: • http://tool**********.biz/progs/tool4.txt It is saved on the local hard drive under: %WINDIR% \tool4.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Killav.DB.2 – The location is the following: • http://tool**********.biz/progs/tool5.txt It is saved on the local hard drive under: %WINDIR% \tool5.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Killav.DB.2 – The location is the following: • http://tool**********.biz/progs/secure32.php It is saved on the local hard drive under: %WINDIR% \secure32.html Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Sma.bfy.5.B – The location is the following: • http://tool**********.biz/progs/paytime.txt It is saved on the local hard drive under: %SYSDIR% \paytime.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/StartPage.adi.5 – The location is the following: • http://tool**********.biz/progs/ms1.txt It is saved on the local hard drive under: %WINDIR% \ms1.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Smal.xk.3.A – The location is the following: • http://tool**********.biz/progs/hosts.txt It is saved on the local hard drive under: %WINDIR% \hosts Furthermore this file gets executed after it was fully downloaded. At the time of writing this file was not online for further investigation. – The location is the following: • http://tool**********.biz/dl/dluniq.php?adv=adv661&code1=%random character string% &code2=%several random digits% It is saved on the local hard drive under: %WINDIR% \uniq Furthermore this file gets executed after it was fully downloaded. At the time of writing this file was not online for further investigation. Registry The following registry key is added: – [HKCU\Software\Microsoft\Windows\CurrentVersion] • "adv661"="adv661" File details Programming language: The malware program was written in MS Visual C++. Runtime packer: In order to aggravate detection and reduce size of the file it is packed with the following runtime packer: • FSG
Description inserted by Iulia Diaconescu on Tuesday, January 10, 2006 Description updated by Iulia Diaconescu on Monday, January 16, 2006
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