Trojan.MulDrop5.57829

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\GFUpd.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Rfwstub.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Runiep.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\GuardField.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RsAgent.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RsMain.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwmain.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavStub.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KASARP.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RAV.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\VPTRAY.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ANTIARP.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kavstart.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVPFW.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kwatch.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kmailmon.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\PFW.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\HijackThis.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Trojanwall.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\TrojDie.KXP] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kissvc.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kav32.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AutoRun.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KPfwSvc.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwsrv.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\SREngLdr.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Rsaupd.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwProxy.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\QQDoctor.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\TrojanDetector.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ArSwp.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RSTray.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\CCenter.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavMonD.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Ravservice.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RAVTRAY.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavTask.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rsnetsvr.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ScanFrm.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavMon.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360tray.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360safebox.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360rpt.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360safe.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AVP.COM] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AvMonitor.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\safeboxTray.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AVP.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Mmsk.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Ast.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KRegEx.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Frameworkservice.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AutoRunKiller.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\VPC32.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\WOPTILITIES.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Regedit.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVMonxp.KXP] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVSrvXP.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\IceSword.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Iparmor.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Nod32kui.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\nod32krn.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVWSC.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Navapsvc.EXE] 'debugger' = '<SYSTEM32>\dllcache\spoolsv.exe'

Creates the following files on removable media:

<Drive name for removable media>:\JC.PIF
<Drive name for removable media>:\AUTORUN.INF

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files

Creates and executes the following:

'%PROGRAM_FILES%\dbs.pif'

Executes the following:

'<SYSTEM32>\sc.exe' delete RavTask
'<SYSTEM32>\sc.exe' delete RsScanSrv
'<SYSTEM32>\sc.exe' delete RsRavMon
'<SYSTEM32>\rundll32.exe' c:\ki.dll,RundllTest
'<SYSTEM32>\net1.exe' start server
'<SYSTEM32>\sc.exe' delete RavCCenter

Terminates or attempts to terminate

the following user processes:

360tray.exe
AVP.EXE

Restores hooked functions in System Service Descriptor Table (SSDT).

Modifies file system :

Creates the following files:

%WINDIR%\Fonts\bavs.sys
C:\JC.PIF
%PROGRAM_FILES%\safe.pif
<SYSTEM32>\eds.ini
C:\AUTORUN.INF
C:\ki.dll
%PROGRAM_FILES%\dbs.pif
%TEMP%\dll1.tmp
%WINDIR%\Fonts\mt.fon

Sets the 'hidden' attribute to the following files:

C:\JC.PIF
<Drive name for removable media>:\AUTORUN.INF
<Drive name for removable media>:\JC.PIF
C:\AUTORUN.INF
<Full path to virus>
%PROGRAM_FILES%\dbs.pif
C:\ki.dll

Deletes the following files:

C:\ki.dll
%WINDIR%\Fonts\bavs.sys
%WINDIR%\Fonts\mt.fon
%PROGRAM_FILES%\dbs.pif

Moves the following system files:

from <SYSTEM32>\mfc71.dll to <SYSTEM32>\mfc1.dll

Network activity:

Connects to:

'd.##c8.com':80
'e.##c8.com':80
'localhost':1037

TCP:

HTTP GET requests:

http://d.##c8.com/dd/x.gif
http://e.##c8.com/tt.txt

UDP:

DNS ASK d.##c8.com
DNS ASK e.##c8.com

Miscellaneous:

Searches for the following windows:

ClassName: 'AfxControlBar42s' WindowName: ''

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