Virus:TR/Clicker.Agent.TP
Date discovered:12/03/2008
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:No
File size:~ 70.000 Bytes
IVDF version:7.00.03.22 - Wednesday, March 12, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: Downloader
   •  Kaspersky: Trojan-Clicker.Win32.Agent.tp
   •  F-Secure: Trojan-Clicker.Win32.Agent.tp
   •  Sophos: Troj/Slupim-Gen
   •  Grisoft: Downloader.Agent.AFTW
   •  Eset: Win32/TrojanDownloader.Agent.BER trojan
   •  Bitdefender: Trojan.Agent.AIWV


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


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

 Files The following file is created:

– %SYSDIR%\crypts.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Ag.29696.A




It tries to download a file:

– The location is the following:
   • http://www.deborah2.biz/**********54.exe
Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Agent.120832.C

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\
   crypt]
   • "DLLName"="crypts.dll"
   • "Impersonate"=dword:00000001
   • "Asynchronous"=dword:00000001
   • "StartShell"="Run"

 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:
   • UPX

Description inserted by Thomas Wegele on Wednesday, December 17, 2008
Description updated by Thomas Wegele on Wednesday, December 17, 2008

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