ThreatExpert's awareness of the file "rundll32.exe":

Across all ThreatExpert reports, the file "rundll32.exe" was mostly identified as a threat.

File "rundll32.exe" has the following statistics:

Total number of reports analysed	611,932
Number of cases that involved the file "rundll32.exe"	172
Number of incidents when this file was found to be a threat	135
Statistical volume of cases when "rundll32.exe" was a threat	78%

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Notes:

Please note that the name of the file should NOT be used to define if it is legitimate or not. Such determination can only be made by observing its dynamic behaviour.
In order to check a file, please submit it to ThreatExpert.
For a comprehensive pro-active protection against threats, please consider ThreatFire - our behavioral antivirus solution.

The file "rundll32.exe" is known to be created under the following filenames:

%AppData%\microsoft\rundll32.exe

%AppData%\rundll32.exe

%CommonPrograms%\startup\rundll32.exe

%FontsDir%\rundll32.exe

%InternetCache%\rundll32.exe

%ProgramFiles%\bifrost\rundll32.exe

%ProgramFiles%\common files\x10\common\rundll32.exe

%ProgramFiles%\intel\rundll32.exe

%ProgramFiles%\internet explorer\wmpscfgs.exe

%ProgramFiles%\rundll32.exe

%Programs%\startup\lsass.exe

%Programs%\startup\rundll32.exe

%System%\cmd.com

%System%\dllcache\csrss.exe

%System%\dllcache\rundll32.exe

%System%\dlls\rundll32.exe

%System%\drivers\etc\rundll32.exe

%System%\drivers\rundll32.exe

%System%\dxdiag.com

%System%\explorer.exe

%System%\iexplore.exe

%System%\inetaccess.scr

%System%\instalation-software\rundll32.exe

%System%\mouse\rundll32.exe

%System%\msconfig.com

%System%\oobe\x.exe

%System%\regedit.com

%System%\restore\winchat.exe

%System%\shellext\rundll32.exe

%System%\smss32.exe

%System%\userinit32.exe

%Temp%\0003f33b_rar\rundll32.exe

%Temp%\00058bdc_rar\rundll32.exe

%Temp%\29a01704\rundll32.exe

%Temp%\antivirusplus.exe

%Temp%\ixp000.tmp\rundll32.exe

%Temp%\jd0.exe

%Temp%\jpa00944\rundll32.exe

%Temp%\l050027\microsoft.net\rundll32.exe

%Temp%\oka00764\rundll32.exe

%Temp%\rarsfx0\file2.exe.exe

%Temp%\rundll32.exe

%Temp%\uyrd4e\rundll32.exe

%Temp%\wmpscfgs.exe

%Templates%\rundll32.exe

%UserProfile%\rundll32.exe

%Windir%\antimanele.scr

%Windir%\command\rundll32.exe

%Windir%\config\templates.exe

%Windir%\cursors\rundll32.exe

%Windir%\dll\rundll32.exe

%Windir%\help\rundll32.exe

%Windir%\inf\rundll32.exe

%Windir%\inf\svchost.exe

%Windir%\microsoft.net\framework\doc1.exe

%Windir%\microsoft.net\framework\lsass.exe

%Windir%\microsoft.net\framework\rundll32.exe

%Windir%\microsoft.net\framework\svchost.exe

%Windir%\microsoft.net\framework\windowsxp.exe

%Windir%\rundll32.exe

%Windir%\services.exe

%Windir%\system\rundll32.exe

%Windir%\system\x.exe

%Windir%\system32:lsassa.exe

%Windir%\txp\rundll32.exe

%Windir%\winlogon.exe

c:\autorun.inf\rundll32.exe

c:\recycled\rundll32.exe

c:\rundll32.exe

c:\windows:rundll32.exe

Notes:

%AppData% is a variable that refers to the file system directory that serves as a common repository for application-specific data. A typical path is C:\Documents and Settings\[UserName]\Application Data.
%CommonPrograms% is a variable that refers to the file system directory that contains the directories for the common program groups that appear on the Start menu for all users. A typical path is C:\Documents and Settings\All Users\Start Menu\Programs (Windows NT/2000/XP).
%FontsDir% is a variable that refers to a virtual folder containing fonts. A typical path is C:\Windows\Fonts.
%InternetCache% is a variable that refers to the file system directory that serves as a common repository for temporary Internet files. A typical path is C:\Documents and Settings\[UserName]\Local Settings\Temporary Internet Files.
%ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.
%Programs% is a variable that refers to the file system directory that contains the user's program groups. A typical path is C:\Documents and Settings\[UserName]\Start Menu\Programs.
%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).
%Templates% is a variable that refers to the file system directory that serves as a common repository for document templates. A typical path is C:\Documents and Settings\[UserName]\Templates.
%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.

The file "rundll32.exe" has the following possible countries of origin:

Origin		Number of Incidents
	China	22
	Romania	4
	Brazil	3
	Russian Federation	3
	Spain	2
	Sweden	2
	Turkey	2
	Mexico	1
	Portugal	1
	Ukraine	1

The following threats are known to be associated with the file "rundll32.exe":

Threat Alias	Number of Incidents
Infostealer [Symantec]	78
Generic PWS.y [McAfee]	72
HackTool.Win32.Patcher.A [Ikarus]	64
HideWindow [McAfee]	63
not-a-virus:RiskTool.Win32.HideWindows [Kaspersky Lab]	63
Backdoor.Win32.Agent.afub [Kaspersky Lab]	60
Mal/Generic-A [Sophos]	43
Hacktool.HideWindow [Symantec]	42
HackTool.HideWindows [PC Tools]	35
Hacktool.HideWindows [PC Tools]	28
Downloader-BPA [McAfee]	24
Trojan-Clicker.Win32.Cycler.nop [Kaspersky Lab]	24
TrojanDownloader:Win32/Unruy.C [Microsoft]	24
Trojan Horse [Symantec]	17
Tool:Win32/HideWindows [Microsoft]	14
Backdoor.Agent!sd6 [PC Tools]	12
Trojan:Win32/Bumat!rts [Microsoft]	12
Trojan-Downloader.Win32.Agent.cwya [Kaspersky Lab]	9
Infostealer.Lineage [Symantec]	8
Trojan.Dropper [Symantec]	8
Trojan.PWS.QQPass [Symantec]	8
Trojan-Clicker.Cycler.nop [PC Tools]	8
Generic StartPage [McAfee]	7
Trojan-PSW.Nilage!sd5 [PC Tools]	7
PWS-Lineage [McAfee]	6
W32.Spybot.Worm [Symantec]	6
Generic.dx [McAfee]	5
StartPage-KG [McAfee]	5
TROJ_STARTPA.OQ [Trend Micro]	5
Trojan.DR.IRCBot.Gen.2 [PC Tools]	5
Generic Downloader.x [McAfee]	4
Trojan.PWS!sd6 [PC Tools]	4
Trojan.StartPage [Symantec]	4
Trojan-PSW.Agent!sd5 [PC Tools]	4
Trojan-PSW.Win32.Agent.aq [Kaspersky Lab]	4
Downloader [Symantec]	3
Generic Downloader.x!cdw [McAfee]	3
Infostealer.Refest [Symantec]	3
Mal/VB-G [Sophos]	3
Trojan-Dropper.Agent [Ikarus]	3
Virus.Win32.Sality.aa [Kaspersky Lab]	3
Virus:Win32/Sality.AM [Microsoft]	3
W32.Antiman.F@mm [Symantec]	3
W32.IRCBot [Symantec]	3
W32.Sality.AE [Symantec]	3
W32/Sality.aq [McAfee]	3
W32/Sality-AM [Sophos]	3
W32/Sdbot.worm [McAfee]	3
Adware.Purityscan [Symantec]	2
Backdoor.Agent [PC Tools]	2
Backdoor.IRC.Bot [Symantec]	2
Backdoor.Poison [Ikarus]	2
Backdoor.Trojan [Symantec]	2
Backdoor.Win32.IRCBot.aus [Kaspersky Lab]	2
Backdoor.Win32.Poison [Ikarus]	2
Backdoor.Win32.Poison.riy [Kaspersky Lab]	2
BackDoor-CEP [McAfee]	2
Downloader.gen.a [McAfee]	2
Email-Worm.Win32.Brontok.N [Ikarus]	2
Generic Dropper.ax [McAfee]	2
Hacktool [Symantec]	2
Mal/FakeAV-AA [Sophos]	2
not-a-Virus.Hacktool.Patch.winrarsetup [Ikarus]	2
not-a-virus:FraudTool.Win32.AntivirusPlus.fg [Kaspersky Lab]	2
Rootkit.Win32.Agent.X [Ikarus]	2
Rootkit.Win32.Agent.x [Kaspersky Lab]	2
Troj/Poison-VB [Sophos]	2
Troj/RKFu-B [Sophos]	2
Trojan.Crypt [Ikarus]	2
Trojan-Downloader.Win32.Agent.kwg [Kaspersky Lab]	2
Trojan-PSW.Win32.Nilage.abk [Kaspersky Lab]	2
Trojan-PSW.Win32.Nilage.afr [Kaspersky Lab]	2
Trojan-PSW.Win32.Prostor.a [Kaspersky Lab]	2
Trojan-PWS.Lineage [PC Tools]	2
TSPY_FOLIN.GEN [Trend Micro]	2
VirTool:Win32/Agent.X [Microsoft]	2
Win-Trojan/Siggen.372884 [AhnLab]	2
Win-Trojan/Xema.variant [AhnLab]	2
Backdoor.Bifrose [Symantec]	1
Backdoor.Dvldr [Symantec]	1
Backdoor.IRCBot.XFY [PC Tools]	1
Backdoor.IRCBot.YED [PC Tools]	1
Backdoor.Tsunami [PC Tools]	1
Backdoor.Win32.Assasin.20.p [Kaspersky Lab]	1
Backdoor.Win32.IRCBot.axr [Kaspersky Lab]	1
Backdoor.Win32.Rbot.gen [Kaspersky Lab]	1
Backdoor.Win32.Tsunami [Ikarus]	1
Backdoor.Win32.Tsunami.c [Kaspersky Lab]	1
Backdoor:Win32/Coolvidoor.D [Microsoft]	1
Backdoor:Win32/Pitchfork.A [Microsoft]	1
Backdoor:Win32/Rbot.gen [Microsoft]	1
BackDoor-AGS.gen [McAfee]	1
BKDR_AGENT.MFP [Trend Micro]	1
BKDR_CHANGEMEM.F [Trend Micro]	1
BKDR_CHANGEMEM.Q [Trend Micro]	1
BKDR_IRCBOT.AXI [Trend Micro]	1
BKDR_IRCBOT.AZB [Trend Micro]	1
BKDR_IRCBOT.AZF [Trend Micro]	1
BKDR_IRCBOT.BCY [Trend Micro]	1
BKDR_IRCBOT.ZP [Trend Micro]	1