ThreatExpert's Statistics for Trojan.Dropper [PC Tools]:

Trojan.Dropper [PC Tools] is also known as:

Threat Alias	Number of Incidents
Trojan.Dropper [Symantec]	2,354
VirTool:WinNT/Koobface.gen!D [Microsoft]	1,568
W32/KoobFa-N [Sophos]	1,568
Worm.Win32.Koobface [Ikarus]	1,568
Trojan-Dropper.Win32.Agent.biin [Kaspersky Lab]	1,536
W32/Koobface.worm.gen.d [McAfee]	1,472
Win32/Koobface.worm.92672 [AhnLab]	1,408
Trojan-Dropper.Agent [Ikarus]	455
Win32/Koobface.worm.75264 [AhnLab]	440
Trojan-Dropper.Win32.Agent.bksq [Kaspersky Lab]	242
Trojan-Dropper.Win32.Agent.blor [Kaspersky Lab]	198
W32/Koobface.worm.gen.r [McAfee]	96
Mal/Generic-A [Sophos]	70
Troj/Virtum-Gen [Sophos]	44
Trojan-Downloader.Win32.Clopack.in [Kaspersky Lab]	40
Mal/Zapchas-A [Sophos]	36
not-a-virus:Client-IRC.Win32.mIRC.603 [Kaspersky Lab]	33
Backdoor.IRC.Zapchast.zwrc [Kaspersky Lab]	32
Trojan:Win32/Vundo.BR [Microsoft]	28
Mal/Behav-112 [Sophos]	18
Infostealer.Gampass [Symantec]	17
BKDR_BIFROSE.DZZ [Trend Micro]	15
New Malware.bl [McAfee]	15
Trojan:Win32/Vundo.gen!AN [Microsoft]	15
Win-Trojan/Agent.11776.KS [AhnLab]	15
Backdoor.IRC.Zapchast [Ikarus]	14
Backdoor-CEP.gen.q [McAfee]	14
VirTool:Win32/Injector.gen!Y [Microsoft]	14
Mal/Gampass-B [Sophos]	13
Troj/Bifrose-XE [Sophos]	13
Trojan-Dropper.Win32.Stabs.aao [Kaspersky Lab]	12
VirTool:Win32/Injector.gen!AG [Microsoft]	12
BackDoor-CEP.gen.am [McAfee]	11
Mal/EncPk-GF [Sophos]	11
Trojan Horse [Symantec]	10
IRC Trojan [Symantec]	9
Trojan.Win32.Pakes.nta [Kaspersky Lab]	9
Trojan.Win32.Scar.aose [Kaspersky Lab]	9
Vundo.dr!a [McAfee]	9
TrojanDropper:Win32/Jadtre.B [Microsoft]	8
Win-Trojan/Xema.variant [AhnLab]	8
TrojanDropper:Win32/Dunik!rts [Microsoft]	7
Trojan-Downloader.Win32.Clopack [Ikarus]	6
Trojan-GameThief.Win32.Magania.bwsr [Kaspersky Lab]	6
Generic Downloader.x!v [McAfee]	5
Generic Dropper.eb [McAfee]	5
Mal/TibsPk-A [Sophos]	5
Troj/Inject-JV [Sophos]	5
Troj/PSW-HE [Sophos]	5
Trojan:Win32/VB [Microsoft]	5
Trojan-Downloader.Win32.VB.rie [Kaspersky Lab]	5
Trojan-GameThief.Win32.OnLineGames.vxfm [Kaspersky Lab]	5
TSPY_ONLINEG.FYU [Trend Micro]	5
Win32/IRCBot.worm.variant [AhnLab]	5
Win-Trojan/Agent.184320.EJ [AhnLab]	5
Win-Trojan/Magania.7034.B [AhnLab]	5
BackDoor-EBI [McAfee]	4
Generic Dropper!bxh [McAfee]	4
Generic.dx!igx [McAfee]	4
Generic.Trojan.Generic [Ikarus]	4
Mal/EncPk-HJ, Mal/EncPk-HJ [Sophos]	4
MultiDropper-TD [McAfee]	4
New Malware.aj [McAfee]	4
Troj/Dropr-BG [Sophos]	4
Trojan.Win32.Agent2.cmhs [Kaspersky Lab]	4
Trojan.Win32.VB.vds [Kaspersky Lab]	4
Trojan.Win32.Vilsel.qia [Kaspersky Lab]	4
Trojan-Downloader.Win32.Agent.cwen [Kaspersky Lab]	4
Trojan-Dropper.Win32.Agent.bjzy [Kaspersky Lab]	4
Trojan-Dropper.Win32.Delf.wj [Kaspersky Lab]	4
VirTool:Win32/CeeInject.gen!AE [Microsoft]	4
Virus.BV.KillAV [Ikarus]	4
Virus.Win32.Rootkit [Ikarus]	4
W32/SillyFDC-DS [Sophos]	4
Win32/Triff.worm.44774 [AhnLab]	4
Win-Trojan/Agent.14336.QJ [AhnLab]	4
Win-Trojan/Buzus.10240.M [AhnLab]	4
Win-Trojan/emGfXkiqjih.80896 [AhnLab]	4
Win-Trojan/Refroso.22016 [AhnLab]	4
Worm.Win32.VBNA.err [Kaspersky Lab]	4
Worm:Win32/Vobfus.B [Microsoft]	4
Backdoor.IRC.Zapchast [Kaspersky Lab]	3
Backdoor.Win32.Bifrose.fqv [Kaspersky Lab]	3
Backdoor.Win32.ProRat.eeh [Kaspersky Lab]	3
Backdoor:Win32/Bifrose.gen!C [Microsoft]	3
BackDoor-CEP.svr [McAfee]	3
Downloader-BZG [McAfee]	3
Generic Dropper [McAfee]	3
Generic VB.i [McAfee]	3
Mal/Vbinder-A [Sophos]	3
New Malware.n [McAfee]	3
Packed.Win32.TDSS.aa [Kaspersky Lab]	3
Packed/Upack [AhnLab]	3
PWS.Win32 [Ikarus]	3
PWS:Win32/OnLineGames.GM [Microsoft]	3
PWS:Win32/OnLineGames.GS [Microsoft]	3
Troj/Bifrose-XZ [Sophos]	3
Troj/MDrop-CJT [Sophos]	3
Trojan.ATRAPS [Ikarus]	3
Trojan.CryptRedol [Ikarus]	3

Trojan.Dropper [PC Tools] has the following possible countries of origin:

Origin		Number of Incidents
	China	134
	Russian Federation	50
	Australia	23
	Japan	4
	Taiwan	4
	Brazil	3
	France	3
	Spain	3
	Germany	2
	Republic of Korea	2
	Italy	1
	Netherlands	1
	Sweden	1
	United Kingdom	1

Trojan.Dropper [PC Tools] is known to be created as:

%CommonAppData%\driver.exe

%FontsDir%\nvcpl.exe

%Profiles%\sys.exe

%ProgramFiles%\bifrost\server.exe

%ProgramFiles%\es2jf1\h2b9la3foph.scr

%ProgramFiles%\es2jf1\t7n65r8.scr

%ProgramFiles%\fn8wu\kv1kbt.scr

%ProgramFiles%\fn8wu\oogf0ei4uo.scr

%ProgramFiles%\msn\msn.exe

%ProgramFiles%\system23\iexplore.exe

%ProgramFiles%\wincrak\payload.exe

%ProgramFiles%\windows updates\winupdate.exe

%System%\bifrost\saret.exe

%System%\bifrost\server.exe

%System%\clientt.exe

%System%\google.dll

%System%\hf0008.exe

%System%\kals.exe

%System%\messenger\msnmsg.exe

%System%\mxd\update.exe

%System%\reader_s.exe

%System%\scvhost.exe

%System%\sdra64.exe

%System%\storm.exe

%System%\twext.exe

%System%\x5ayk9v2b64.exe

%Temp%\_a00f1bf82.exe

%Temp%\_a00f1c281f46.exe

%Temp%\_a00f357d5.exe

%Temp%\_a00f35804.exe

%Temp%\_a00f3598b.exe

%Temp%\_a00f36d42.exe

%Temp%\1.exe

%Temp%\14cd430h896144.exe

%Temp%\2.exe

%Temp%\221625_xeex.exe

%Temp%\992115.exe

%Temp%\ixp000.tmp\obadah.exe

%Temp%\ixp000.tmp\s.exe

%Temp%\keygen..exe

%Temp%\keygen.exe

%Temp%\lightningcrypter.exe

%Temp%\ok.exe

%Temp%\richtx64.exe

%Temp%\server.exe

%Temp%\vbaaaah.exe

%Temp%\xx.exe

%UserProfile%\1.exe

%UserProfile%\reader_s.exe

%Windir%\freddy101.exe

%Windir%\internet explor\internet.exe

%Windir%\rdr_1258596882.exe

%Windir%\rdr_1258596968.exe

%Windir%\rdr_1258679102.exe

%Windir%\rdr_1258679193.exe

%Windir%\rdr_1258845709.exe

%Windir%\rdr_1258845796.exe

%Windir%\rdr_1258927972.exe

%Windir%\rdr_1258928047.exe

%Windir%\rdr_1258962237.exe

%Windir%\rdr_1258962237.exe.exe

%Windir%\rdr_1258995288.exe

%Windir%\rdr_1258995376.exe

%Windir%\rdr_1259008637.exe

%Windir%\rdr_1259008709.exe

%Windir%\rdr_1259113272.exe

%Windir%\rdr_1259113357.exe

%Windir%\rdr_1259136446.exe

%Windir%\rdr_1259136520.exe

%Windir%\rdr_1259136531.exe

%Windir%\rdr_1259166783.exe

%Windir%\rdr_1259166886.exe

%Windir%\rdr_1259172729.exe

%Windir%\rdr_1259172832.exe

%Windir%\rdr_1259233360.exe

%Windir%\rdr_1259233448.exe

%Windir%\rdr_1259269467.exe

%Windir%\rdr_1259269547.exe

%Windir%\rdr_1259311143.exe

%Windir%\rdr_1259311231.exe

%Windir%\rdr_1259356734.exe

%Windir%\rdr_1259356821.exe

%Windir%\rdr_1259465923.exe

%Windir%\rdr_1259465951.exe

%Windir%\rdr_1259465969.exe

%Windir%\rdr_1259465997.exe

%Windir%\rdr_1259466011.exe

%Windir%\rdr_1259466038.exe

%Windir%\rdr_1259466055.exe

%Windir%\rdr_1259466097.exe

%Windir%\rdr_1259595070.exe

%Windir%\rdr_1259595150.exe

%Windir%\rdr_1259621474.exe

%Windir%\rdr_1259621558.exe

%Windir%\rdr_1259621573.exe

%Windir%\rdr_1259622945.exe

%Windir%\rdr_1259623031.exe

%Windir%\rdr_1259679371.exe

%Windir%\rdr_1259679458.exe

%Windir%\rdr_1259711924.exe

Notes:

%CommonAppData% is a variable that refers to the file system directory containing application data for all users. A typical path is C:\Documents and Settings\All Users\Application Data.
%FontsDir% is a variable that refers to a virtual folder containing fonts. A typical path is C:\Windows\Fonts.
%Profiles% is a variable that refers to the file system directory containing user profile folders. A typical path is C:\Documents and Settings.
%ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.
%System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
%Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).
%UserProfile% is a variable that specifies the current user's profile folder. By default, this is C:\Documents and Settings\[UserName] (Windows NT/2000/XP).
%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.