Worm/Hakaglan.B - Worm

See also

Summary

Full description

Statistics

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 - Thu, 05 Apr 2007 19:39 (GMT+1)

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

See a brief description here.

Description inserted by Andrei Gherman on Fri, 14 Mar 2008 09:02 (GMT+1)
Description updated by Andrei Gherman on Fri, 14 Mar 2008 10:00 (GMT+1)

» About Malware
» About Phishing
» Viruses In the Wild

« back