Virus:Worm/Locksky.AG.1
Date discovered:20/03/2006
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:28.144 Bytes
MD5 checksum:6e5484357bb2c76edc02cc02176f053c
VDF version:6.34.00.75 - Monday, March 20, 2006
IVDF version:6.34.00.75 - Monday, March 20, 2006

 General Method of propagation:
   • Email


Aliases:
   •  Mcafee: Spam-FiveSec
   •  Kaspersky: Email-Worm.Win32.Locksky.ag
   •  TrendMicro: WORM_LOCKSKY.BC
   •  VirusBuster: Worm.Locksky.BV
   •  Eset: Win32/Locksky.NAA
   •  Bitdefender: Win32.Locksky.AG@mm


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
   • Uses its own Email engine
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %SYSDIR%\spoolsvv.exe




It tries to download a file:

– The location is the following:
   • http://5sec**********/panel/upd1.txt
At the time of writing this file was not online for further investigation.

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "spoolsvv"="%SYSDIR%\spoolsvv.exe"



It creates the following entry in order to bypass the Windows XP firewall:

– HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List
   • "%malware execution directory%\%executed file%
      "="%malware execution directory%\%executed file%
      :*:Enabled:enable"

 Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:


From:
The sender address is spoofed.


To:
– Email addresses found in specific files on the system.
– Email addresses gathered from WAB (Windows Address Book)


Attachment:

The attachment is a copy of the malware itself.

 Mailing Search addresses:
It searches the following file for email addresses:
   • htm


Address generation for FROM field:
To generate addresses it uses the following strings:
   • admin
   • webmaster
   • support


 Backdoor Contact server:
All of the following:
   • http://5sec**********/panel/task.php?
   • http://5sec**********/panel/report.php?
   • http://5sec**********/panel/inst.php?

As a result it may send some information.

Sends information about:
    • IP address
    • Current malware status

 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 Irina Boldea on Wednesday, July 19, 2006
Description updated by Irina Boldea on Monday, July 31, 2006

Back . . . .