Virus:TR/Drop.Small.bak
Date discovered:21/09/2007
Type:Trojan
Subtype:Dropper
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:12.288 Bytes
MD5 checksum:0D2c61e0a1ebde457615821f0C2923c2
IVDF version:6.39.01.161 - Friday, September 21, 2007

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Dropper.Win32.Small.bak
   •  F-Secure: Trojan:W32/Agent.DNE
   •  Sophos: Troj/Dropper-RK
   •  Grisoft: Downloader.Agent.STR


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


Side effects:
   • Drops a malicious file

 Files It deletes the initially executed copy of itself.



The following file is created:

– %SYSDIR%\down.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Agent.dne




It tries to executes the following file:

– Filename:
   • %SYSDIR%\regsvr32.exe
using the following command line arguments: /s down.dll


– Filename:
   • %SYSDIR%\cmd.exe
using the following command line arguments: /c %malware execution directory%\%executed file% >> NUL
This batch file is used to delete a file.

 File details Programming language:
 The malware program was written in MS Visual C++.

Description inserted by Andrei Gherman on Monday, September 24, 2007
Description updated by Andrei Gherman on Monday, September 24, 2007

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