Home Malware Programs Worms Autorun.PL

Autorun.PL

Posted: December 9, 2010

Threat Metric

Threat Level: 5/10
Infected PCs: 70
First Seen: December 9, 2010
Last Seen: May 5, 2020
OS(es) Affected: Windows

Autorun.PL (Worm:Win32/Autorun.PL) is a worm that circulates by adding copies of itself onto removable drives. Autorun.PL also makes changes to the system file 'explorer.exe'. Autorun.PL runs the modified system file 'explorer.exe' every time Windows starts. By replacing the system file with its own copy, Autorun.PL makes sure that it is launched whenever Windows is started. Once installed and executed, Worm:Win32/Autorun.PL makes system changes by dropping potentially malicious files. Worm:Win32/Autorun.PL also makes registry modifications on the compromised PC. Autorun.PL also drops an 'autorun.inf' file in the root directory of removable drives. Such 'autorun.inf' files include instructions for the operating system so that when the removable drive is accessed from another computer, which supports the Autorun feature, Autorun.PL is executed automatically.

Aliases

Application/Downloader [Panda]AdInstaller.D [AVG]Misc/OnlineInstaller [Fortinet]not-a-virus:Downloader.Win32.Agent [Ikarus]Win32/Agent.A!generic [eTrust-Vet]BDS/Gendal.570910 [AntiVir]Trojan.PWS.Siggen.7905 [DrWeb]Heur.Suspicious [Comodo]Backdoor.Generic.570910 [BitDefender]not-a-virus:Downloader.Win32.Agent.dt [Kaspersky]Trojan.Delf-9436 [ClamAV]W32/Dropper.AE.gen!Eldorado [F-Prot]a variant of Win32/SweetIM.A [NOD32]Unwanted-Program [K7AntiVirus]FakeAV.JRX [AVG]
More aliases (58)

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:



64443354333d33c23d12c73ada654b34 File name: 64443354333d33c23d12c73ada654b34
Size: 83.48 KB (83485 bytes)
MD5: 64443354333d33c23d12c73ada654b34
Detection count: 92
Group: Malware file
Last Updated: January 28, 2013
392be78a1079a6381849e16c918b3cd7 File name: 392be78a1079a6381849e16c918b3cd7
Size: 84.67 KB (84672 bytes)
MD5: 392be78a1079a6381849e16c918b3cd7
Detection count: 84
Group: Malware file
Last Updated: January 28, 2013
ede59f72d4f25cbaead4ba0557a45bb6 File name: ede59f72d4f25cbaead4ba0557a45bb6
Size: 84.94 KB (84948 bytes)
MD5: ede59f72d4f25cbaead4ba0557a45bb6
Detection count: 76
Group: Malware file
Last Updated: January 28, 2013
C:\$Recycle.Bin\S-1-5-21-1690734013-1579943970-3066372542-1000\$RMCBLL6.exe File name: $RMCBLL6.exe
Size: 404.48 KB (404480 bytes)
MD5: 301c7b99399cf81c4ebf6ff04242779f
Detection count: 33
File type: Executable File
Mime Type: unknown/exe
Path: C:\$Recycle.Bin\S-1-5-21-1690734013-1579943970-3066372542-1000\$RMCBLL6.exe
Group: Malware file
Last Updated: August 7, 2022
%WINDIR%\Explorer.exe File name: Explorer.exe
Size: 4.26 MB (4269294 bytes)
MD5: 17b28c4dec61a4a22ceb01245edf02a9
Detection count: 7
File type: Executable File
Mime Type: unknown/exe
Path: %WINDIR%
Group: Malware file
Last Updated: December 9, 2010
%windir%\explorer.exe[15 RANDOM DIGITS] File name: %windir%\explorer.exe[15 RANDOM DIGITS]
Mime Type: unknown/exe[15 RANDOM DIGITS]
Group: Malware file
<system folder>\sysanalysis.exe File name: <system folder>\sysanalysis.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
<system folder>\services.exe File name: <system folder>\services.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
<system folder>\explorer.exe[15 RANDOM DIGITS] File name: <system folder>\explorer.exe[15 RANDOM DIGITS]
Mime Type: unknown/exe[15 RANDOM DIGITS]
Group: Malware file
[Chinese characters].exe File name: [Chinese characters].exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
Mourn_Operator.exe File name: Mourn_Operator.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{Value}HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL "ShowSuperHidden" = "0"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced "ShowSuperHidden" = "0"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\HideFileExt "CheckedValue" = "0"HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer "NoFolderOptions" = "1"
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