Virus:BDS/Eggdrop.aam
Date discovered:10/02/2010
Type:Backdoor Server
Subtype:Dropper
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:125.440 Bytes
MD5 checksum:a269788bb676dad9b18755c381da3f5f
IVDF version:7.10.04.20 - Wednesday, February 10, 2010

 General Methods of propagation:
   • Autorun feature
   • Peer to Peer


Aliases:
   •  Mcafee: BackDoor
   •  Bitdefender: Gen:Heur.Krypt.10
   •  Panda: Bck/EggDrop.AL
   •  Eset: Win32/Peerfrag.DR


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


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

 Files It copies itself to the following locations:
   • %drive%\open=usb_run.exe
   • %recycle bin%\%CLSID%\mwau.exe



The following files are created:

– %recycle bin%\%CLSID%\Desktop.ini
– %drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %TEMPDIR%\560.exe



It tries to download a file:

– The location is the following:
   • http://rapidshare.com/files/410900543/**********

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

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Taskman"="%recycle bin%\%CLSID%\mwau.exe"

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:   It retrieves shared folders by querying the following registry keys:
   • Software\BearShare\General
   • Software\iMesh\General
   • Software\Shareaza\Shareaza\Downloads
   • Software\Microsoft\Windows\CurrentVersion\Uninstall\eMule Plus_is1

   It searches for directories that contain the following substring:
   • \Local Settings\Application Data\Ares\My Shared Folder


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Thursday, August 5, 2010
Description updated by Petre Galan on Thursday, August 5, 2010

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