Published Oct 09, 2009 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: Win32/SillyAutorun.AJH (CA) Trojan-Dropper.Win32.Autoit.y (Kaspersky) AutoIt.BT (Norman) W32/Autoit-EA (Sophos) Trojan.DR.Autoit.WG (VirusBuster) Win32/AutoRun.Autoit.AH (ESET) W32/Autorun.worm.h (McAfee) W32/Sohanat.IW (Panda)


Worm:Win32/Abfewsm.A is a worm that spreads by placing copies of itself in the folder used for files to be written into CDs. It is capable of modifying a variety of system services as well as disabling Control Panel and registry editors. It may also modify some firewall settings.
Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see
Enabling registry editor
This threat may modify the system to prevent Registry Editor from running. To reverse this effect on your system, please do the following:
  1. Run a command prompt. Click Start>Run and type cmd.
  2. In the command prompt, type the following as is and press Enter:
    reg.exe add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
  3. Type exit at the command prompt.
Other recovery instructions
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
322756 How to back up and restore the registry in Windows
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To remove/modify the changes that Worm:Win32/Abfewsm.A has made to your computer, follow these steps:
1) Click Start and then click Run.
2) In the Open box, type regedit and then click OK.
3) Locate and then click on the following registry key:
4) On the right panel, right-click on the following registry entry:
5) Select Delete and then click OK.
6) Locate and then click on the following registry key:
7) Right click on the subkey "Epoch" and select Delete. Select Yes.
8) Locate and click on the following registry key:
9) On the right panel, right-click on the following registry entry:
"<system folder>\KHATRA.exe"
10) Select Delete and then click OK.
11) Close Registry Editor.
This threat may make lasting changes to an affected system’s configuration that will NOT be restored by detecting and removing this threat. For more information on returning an affected system to its pre-infected state, please see the following article/s: 
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