Virus:Worm/Hakaglan.B
Date discovered:05/04/2007
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:268.216 Bytes
MD5 checksum:0D94f594bca6d09ab3423b962da0e9df
IVDF version:6.38.00.184 - Thursday, April 5, 2007

 General Methods of propagation:
   • Mapped network drives
   • Messenger


Aliases:
   •  Mcafee: Downloader-FL
   •  F-Secure: Worm.Win32.AutoIt.c
   •  Sophos: W32/SillyFDC-G
   •  Grisoft: Worm/Autoit.X
   •  Eset: Win32/Hakaglan.B
   •  Bitdefender: Win32.Worm.Sohanat.AB


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


Side effects:
   • Lowers security settings
   • Registry modification
   • Third party control

 Files It copies itself to the following locations:
   • %SYSDIR%\RVHOST.exe
   • %WINDIR%\RVHOST.exe
   • %drive%\New Folder.exe



The following file is created:

– %WINDIR%\tasks\At1.job File is a scheduled task that runs the malware at predefined times.

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • Yahoo Messengger = %SYSDIR%\RVHOST.exe



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • Shell = Explorer.exe
   New value:
   • Shell = Explorer.exe RVHOST.exe

– [HKLM\SYSTEM\CurrentControlSet\Services\Schedule]
   New value:
   • AtTaskMaxHours = 0

Disable Regedit and Task Manager:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   New value:
   • DisableTaskMgr = 1
   • DisableRegistryTools = 1

Various Explorer settings:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • NofolderOptions = 1

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\
   WorkgroupCrawler\Shares]
   New value:
   • shared = \\%computer name%\%drive%\New Folder.exe

 Messenger It is spreading via Messenger. The characteristics are described below:

– Yahoo Messenger


To:
All online contacts in the contact list.


Message
The sent message looks like the following:

   • %gathered from the internet%


The received messages may look like the following:




 Backdoor Contact server:
All of the following:
   • http://nhatquanglan2.0catch.com/**********
   • http://nhatquanglan2.0catch.com/**********
   • http://www.freewebs.com/nhattruongquang/**********

As a result remote control capability is provided. The servers answer is written to the file: %SYSDIR%\settings.ini


Remote control capabilities:
    • Download file
    • Execute file
    • Spam related
    • Visit a website

Description inserted by Andrei Gherman on Friday, March 14, 2008
Description updated by Andrei Gherman on Friday, March 14, 2008

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