The last blog we did was about an IRCBot that was spreading through MSN. This strain of malware has got our attention because of the level of activity surrounding it. They are releasing new variants really quickly, changing IRC servers on every variant.

What's worse is that a lot of people got infected with this malware. Let's make a summary of all variants we've seen.

The malware can come through MSN with one of these messages:

• Regarde les tof de mes vacances en tunisie loool
• Mira cómo Paris Hilton es perdida después de ser encarcelada :(
• Guarda come Paris Hilton sprecato è, dopo che era imprijonata :(
• Kijk hoe erg Paris Hilton er aan toe is na gevangenschap :(
• kAN BA LI XI ER DUN JIN JIANYU HOU SHI DUO ME QIAOCUI :(
• Kolla hur förstörd Paris Hilton är, efter att hon fängslades :(
• bak sana Paris Hilton ne hale gelmis hapiste :(
• Lede hvor spild Paris Hilton er efter hun fik fængsel :(
• Veja como Paris Hilton está acabada depois de ter sido presa :(
• guck wie scheisse Paris Hilton aussieht, seitdem sie wieder aus dem knast ist :(
• Hey please look at me and my pet .. :p
• Toi et moi !!! .... regarde :p
• Usted e yo !!! .... Mira :p
• Tu ed io !!! .... guarda :p
• Jij en Ik !!!! .... kijk :p
• NI HE WO !!! .... QING KAN :p
• Du och jag !! .... Kolla ;)
• Sen ve Ben !!! .... BAK :p
• Jer og Mig !!! ... se :p
• Você e eu !!!! .... Veja :p
• du und ich !!! ....guck :p
• Looking for hot summer pictures ? well here they are !! (h)
• hey stp regarde mes tof !
• Mira mis fotos jejeje :p
• Guardi le mie foto hihi :p
• Kijk eens naar mijn fotos hihi :p
• KAN WO DE ZHAOPIAN :p
• Kolla på min bilder, hihi :p
• Baksana benim fotograflara hihi :p
• Se på min fotos :p
• Veja as minhas fotos hehehe :p
• siehe meine fotos hihi :p
• Look at me and my volleyball team, working our asses offff (h)
• Hey s'il te plait accepte mes photos :o !!
• Ha aceptado mis fotos por favor :o !!
• Mairee photos accept karo :o !!
• HEY !! accepteer mn fotos dan !
• JIESHOU WO DE ZHAO PIAN :o !!
• Hey, acceptera mina bilder, snälla :o
• Hey benim fotolarimi kabul et :o !!
• Hej behage optage min foto :o !!
• Por favor aceite as minhas fotos :o !!
• hey bitte nimm meine fotos an :o !!
• Hey please look at me and my pet .. :p
• Une tof de moi et ...:$ !!
• Una foto con mi mejor amigo e yo :$ !!
• Una foto con me ed il mio amico migliore :$ !!
• met mijn beste vriend op de foto !! :$
• YI ZHANG WO GEN WO PENGYOU ZUI HAO DE ZHAOPIAN :$ !!
• En bild på mig och min bästa vän :$ !!!
• Iyi arkadasimla fotorafdayim :$ !!
• EN foto hos mig og min bedst ven :$ !!
• Uma foto com o meu melhor amigo e eu :$ !!
• ein foto mit meinem besten freund und mir :$ !!
• Psssssst .... just between me and you, please accept :$
• Une tof de moi et ...:$ !!
• Esta soy yo totalmente desnuda :o por favor no envía para nadie
• Questa e me totaly nudo :o prego non trasmette a chiunque
• Dit ben ik naakt op de foto, stuur alsjeblieft niet door.
• ZHE SHI WO DE LUOZHAO :o QING BU YAO FA GEI BIEREN !!
• Detta är jag HELT naken.. :o Skicka inte till någon annan, snälla...
• benim bu ciplak fotoda :o ama baskasina yollama
• denne er mig hele bar behage vage vendlig og sende den ikk til nogle :o
• Esta sou eu totalmente nua :o por favor não mande isso pra ninguém'
• das bin ich total nackt :o bitte sende es niemand anderem
• This is me totaly naked :o please dont send to anyone else
• hihi kijk eens naar mijn geile fotos :$
• hihi look at my horny pictures :$
• salut! accept mes tofs! (H)
• ey alles goed ? accepteer het !! (H
• Sen ve Ben !!! .... BAK :p
• Jer og Mig !!! ... se :p
• Você e eu !!!! .... Veja :p
• hi howdy ? accept it !! (H)
• T'as pas vu mes tof d'été ?? (B)(D)
• look at my great summer pictures (B)(D)
• hey je viens de trouvé tes tof sur net :S
• ik hou van je, daarom stuur ik je dit !!! :o
• i love u thats why i send this !!! :o
• oh mon dieux regarde ca!!
• oh my god kijk eens naar die foto :o wowwww
• oh my god look at this picture :o wowwww
• c moi entrain du boire jus!!
• C'est moi totalement nu :o s'il te plait ne l'envoie a personne d'autre
• this is me drinking some juice !!

The file can be called:

• pictures[numbers]
• photo_album[numbers]
• photos2007_[numbers]
• images[numbers]
• images0[numbers]
• photo[numbers]
• photos0[numbers]
• album[numbers]
• itsME[numbers]
• webcam-photos0[numbers]
• summer[numbers]

File is packed with NTKrnl packer.

After executed, it may copy itself under Windows System directory as:

• msninet.exe
• msn.exe
• intlprinters.exe
• printers.exe

And it may create a dll, which is the main infection vector, usually under Windows System directory with one of these names:

• sysprinters.dll
• libhelps.dll
• libmsns.dll
• libcintle2.dll
• libcintles3.dll
• notiffy.dll
• sysrcvr2.dll
• sysrcvr246.dll

The DLL is registered as CLSID with random value and it's loaded through registry key:

hklm\software\microsoft\windows\currentversion\shellserviceobjectdelayload\

where CLSID registered by malware is loaded with one of these values:

• printers
• drivers
• system32
• syshelps

The dynamic library is responsbile for MSN spread and it may connect to a remote IRC server where remote attacker can command infected PC. IRC servers already seen are:

• www.free4people.net
• john.free4people.net
• www.onlinesciencexxx.com
• games.onlinesciencexxx.com
• https.easypwn.com

This malware is already detected by Prevx as Backdoor.IRCBot.gen and fully removed. Looking at how quickly the team behind this malware is releasing new variants, we expect more variants to be released this week. So the advice for this week is to make sure you know what you are accepting when you accept file transfers over MSN.