This worm uses the fact of a known hoax about the jdbgmgr.exe file to spread. This file is normally a windows component, this worm overwrites that file, so all the warnings telling the file is harmless become not true. The icon of Recory worm looks like that:
The information about the hoax can be found:
The worm is programmed in Visual Basic, spreads through IRC modifying the Mirc scripts, and tries to copy itself to the shared folder of several P2P and messaging programs.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
The worm is UPX packed.
Names of the files copied to shared folders of P2P programs are:
- -The Lord of the Rings - The Two Towers (Fast-Downloader).pif
- -007 - Die Another Day (Rocket Downloader).pif
- -Harry Potter and the Chamber of Secrets (Fast-Downloader).pif
- -Britney Spears Wallpaper.pif
- -Harry Potter and the Philosophers Stone (Movie-Downloader).pif
Among the affected programs are:
- -Kazaa Lite
The worm send e-mails with the following text.
Message's text follows:
------------------------------------------------------------------ Hello readers, I have just cleaned my computer from a highly damaging computer virus Which is spreading rapidly through computer networks worldwide. There is one way to check to see if your computer is infected with this virus. Click the "Start" menu at the bottom left of your screen. Click the "Find" or "Search" button. Click the "Files or folders..." option. Then once the search application starts, type "Jdbgmgr.exe" If you have found this file, right-click on it and click the "Properties" tab. If the Properties menu has a picture of a bear on it, your computer is infected with this virus. (Note that the non-infected file picture has a hammer and a screwdriver shown in it) You may delete this file, but this is not the only file that the virus infects, To remove this virus, I have included a virus removal tool in the attachments that will scan all system files and remove any infectious code from them. This virus removal tool is very easy to use. If you have any trouble with this tool, read the help menu that the removal tool supplies. If your computer is infected with this virus, It is strongly recommended that you send this removal tool to as many people as you can to help remove the traces of this virus worldwide.
Of course, opposite as said in the message the bear icon corresponds to the normal version of the jdbgmgr.exe file, the one with the screwdriver is the worm.
It copies itself to the following files:
In the Windows Startup folder:
In the "Windows\System32" folder:
-"MswinRegFiles32.com" -"CheckThis.pif" -"Jdbgmgr.exe" -"Msjpeg32.pif" -"Runsys32.bat" -"Regfiles.bat" -"Winbatch.bat" -"Msjava.pif" -"Filecmd32.com" -"Mswin32.pif" -"Winocx32.pif"
In the "Windows\Java" folder:
-"WinJava32.pif" -"Javatemp.bat" -"JavaStart.com"
In the Windows folder:
-"Jdbgmgr.exe" -"TempFiles.pif" -"WinStartup.pif" -"Msupdater32.pif" -"WinStart32.pif" -"Winupd32.com" -"Regedit32.com" -"Winhlp32.com" -"Charmap.pif"
In "Documents And Settings/[User]/Local Configuration/Temp":
In shared drives as:
It also saves itself with names as of the ones generated for the attachments.
Posible subjects for the message are, it can be preceeded by "Fw:" or "Fwd:"
Computer virus outbreak Computer virus removal About a severe computer virus Severe computer virus alert Virus removal tool Severe alert Attention employees Alert Readme Important Important Information Update your virus scanners Warning Microsoft support Knowledge Database alert Virus warning Virus alert Help with removal Removal tool Urgent news
Possible names for the attachment can be:
RemovalTool FixTool KillVir KillVirus RepairVirus RepairVir Cleaner VirusFix CleanVirus CleanVir VirFix FixVir FixVirus VirusRemoval RemoveVirus WinProtect VirusClean VirusCleaner ScanVir ScanVirus Repair RepairWizard RepairScan Scanner FileScanner ScanFiles FixFiles FileFix RepairTool VirusRepair VirRepair RepairFiles FileRepair AntiVirus AntiVir RemoveVir CleanFiles FileClean FileCleaner FileRepairer CleanTool CleanerTool FixComputer RepairComputer CleanComputer FixComp RepairComp CleanComp FixPC RepairPC CleanPC FixSystem RepairSystem CleanSystem FixSys RepairSys CleanSys SystemFix SystemClean SystemRepair SysFix SysClean SysRepair Recovery
With any extension from the following list (.exe, .pif, .com, ).
The following key is created in the Windows' registry:
Technical Details: Ero Carrera; F-Secure Corp.; January 7th, 2003