BDS/Glecia.D - Backdoor Server

See also

Summary

Full description

Statistics

Virus:	BDS/Glecia.D
Date discovered:	20/10/2009
Type:	Backdoor Server
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low to medium
Damage Potential:	Medium
Static file:	Yes
File size:	61.440 Bytes
MD5 checksum:	3b2064e0b51f242d1955cb402653201c
IVDF version:	7.01.06.126 - Tue, 20 Oct 2009 08:16 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Kaspersky: Packed.Win32.Krap.x
   • F-Secure: Packed.Win32.Krap.x
   • Eset: Win32/Kryptik.AWF

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

Side effects:
   • Drops malicious files
   • Registry modification

Files – %SYSDIR%\sys.dat Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: BDS/Glecia.A

– %SYSDIR%\bhdvgtueyitf.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: BDS/Glecia.A

– c:\%malware execution directory%\sys.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

Registry The following registry keys are added:

– [HKCR\CLSID\{%CLSID%}]
   • "(Default)"="Microsoft Online Helper!"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{%CLSID%}]
   • "(Default)"="Microsoft Online Helper!"

– [HKCR\CLSID\{%CLSID%}\InProcServer32]
   • "(Default)"=hex(2):%hex values%
   • "ThreadingModel"="Apartment"

The following registry key is changed:

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   New value:
   • ^%\E$@@
   • n%^a&^()%b
   • (^$%l%(^%$e(^& ^%\
   • $%r$$^%o$
   • (%w@$%
   • $s%^^%$e%^(()(*& %
   • E*&^&x$(%%t%$
   • $@e^^%@(n
   • $%s))
   • %i*^o$%$^$^n(&*s(%^&="yes"

Email It doesn't have its own spreading routine but it was spammed out via email. The characteristics are described in the following:

From:
The sender address is spoofed.

Subject:
The following:
   • DHL service. Please get your parcel. Delivery NR.163400

Body:
The body of the email is one of the lines:
   • Hello!
   •
   • The courier company was not able to deliver your parcel by your address.
   • Cause: Error in shipping address.
   •
   • You may pickup the parcel at our post office personaly!
   •
   • Please note!
   • The shipping label is attached to this e-mail.
   • Please print this label to get this package at our post office.
   •
   •
   • Thank you for attention.
   • DHL Global Forwarding Services.

Attachment:
The filename of the attachment is:
   • DHL_package_label_6f1aa.zip

The attachment is an archive containing a copy of the malware itself.

The email looks like the following:

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 a runtime packer.

See a brief description here.

Description inserted by Tobias Gruber on Tue, 20 Oct 2009 10:09 (GMT+1)
Description updated by Philipp Wolf on Tue, 20 Oct 2009 11:53 (GMT+1)

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