Analysis by: Johnlery Triunfante
ALIASES:

Trojan-Downloader.Win32.Todon.u (Kaspersky); Mal/DelpDldr-C (Sophos); TrojanDownloader:Win32/Small (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 25,240 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 10 Mar 2011

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following files:

  • {Drive Letter}:\autorun.inf
  • %Program Files%\{Random filename}.inf

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It drops the following copies of itself into the affected system:

  • %Program Files%\Common Files\System\{Random filename}.exe
  • %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • {Drive Letter}:\{Random filename}.exe
  • %Program Files%\{Random filename}.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = 145

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\wscsvc
Start = 4

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\wuauserv
Start = 4

(Note: The default value data of the said registry entry is 2.)

HKEY_CURRENT_USER\Software\{Random key}
{Random registry value} = %Program Files%\Common Files\System\{Random filename}.exe

HKEY_CURRENT_USER\Software\{Random key}
{Random registry value} = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
AVP =

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue =

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://head.{BLOCKED}ml.biz/update/wow.exe
  • http://head.{BLOCKED}ml.biz/update/zt.exe
  • http://head.{BLOCKED}ml.biz/update/jh.exe
  • http://head.{BLOCKED}ml.biz/update/wm.exe
  • http://head.{BLOCKED}ml.biz/update/tl.exe
  • http://head.{BLOCKED}ml.biz/update/my.exe
  • http://head.{BLOCKED}ml.biz/update/1.exe
  • http://head.{BLOCKED}ml.biz/update/2.exe
  • http://head.{BLOCKED}ml.biz/update/3.exe
  • http://head.{BLOCKED}ml.biz/update/update.txt
  • http://head.{BLOCKED}ml.biz/update/mh.exe

NOTES:

This Trojan creates the following registry entry under this key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{Anti-Virus Program Name} Debugger = %Program Files%\Common Files\Microsoft Shared\{Random File Name}.exe

Note: {Anti-Virus Program Name} can be any of the following

  • 360Safe.exe
  • 360rpt.exe
  • 360tray.exe
  • AST.exe
  • AgentSvr.exe
  • AppSvc32.exe
  • ArSwp.exe
  • AvMonitor.exe
  • CCenter.exe
  • EGHOST.exe
  • FTCleanerShell.exe
  • FYFireWall.exe
  • FileDsty.exe
  • HijackThis.exe
  • IceSword.exe
  • Iparmor.exe
  • KASMain.exe
  • KASTask.exe
  • KAV32.exe
  • KAVDX.exe
  • KAVPF.exe
  • KAVPFW.exe
  • KAVSetup.exe
  • KAVStart.exe
  • KISLnchr.exe
  • KMFilter.exe
  • KMailMon.exe
  • KPFW32.exe
  • KPFW32X.exe
  • KPfwSvc.exe
  • KRegEx.exe
  • KRepair.com
  • KVCenter.kxp
  • KVMonXP.kxp
  • KVMonXP_1.kxp
  • KVScan.kxp
  • KVSrvXP.exe
  • KVStub.kxp
  • KWatch.exe
  • KWatch9x.exe
  • KWatchX.exe
  • KaScrScn.SCR
  • KsLoader.exe
  • KvDetect.exe
  • KvReport.kxp
  • KvXP.kxp
  • KvXP_1.kxp
  • KvfwMcl.exe
  • MagicSet.exe
  • NPFMntor.exe
  • Navapsvc.exe
  • Navapw32.exe
  • PFW.exe
  • PFWLiveUpdate.exe
  • QHSET.exe
  • QQDoctor.exe
  • QQKav.exe
  • Ras.exe
  • Rav.exe
  • RavMon.exe
  • RavMonD.exe
  • RavStub.exe
  • RavTask.exe
  • RegClean.exe
  • RsAgent.exe
  • Rsaupd.exe
  • SREng.EXE
  • SmartUp.exe
  • SysSafe.exe
  • TrojDie.kxp
  • TrojanDetector.exe
  • Trojanwall.exe
  • UIHost.exe
  • USBCleaner.exe
  • UmxAgent.exe
  • UmxAttachment.exe
  • UmxCfg.exe
  • UmxFwHlp.exe
  • UmxPol.exe
  • UpLive.exe
  • WoptiClean.exe
  • adam.exe
  • autoruns.exe
  • avconsol.exe
  • avgrssvc.exe
  • avp.com
  • avp.exe
  • ccSvcHst.exe
  • iparmo.exe
  • isPwdSvc.exe
  • kabaload.exe
  • kvol.exe
  • kvolself.exe
  • kvupload.exe
  • kvwsc.exe
  • loaddll.exe
  • mcconsol.exe
  • mmqczj.exe
  • mmsk.exe
  • nod32.exe
  • nod32krn.exe
  • nod32kui.exe
  • rfwcfg.exe
  • rfwmain.exe
  • rfwsrv.exe
  • rstrui.exe
  • runiep.exe
  • safelive.exe
  • scan32.exe
  • shcfg32.exe
  • symlcsvc.exe
  • upiea.exe
  • vsstat.exe
  • webscanx.exe

  SOLUTION

Minimum Scan Engine: 9.850
VSAPI OPR PATTERN File: 5.883.00
VSAPI OPR PATTERN Date: 08 Apr 2009

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\wuauserv
    • From: Start = 4
      To: Start = 2
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\wscsvc
    • From: Start = 4
      To: Start = 2

Step 5

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoDriveTypeAutoRun = 145
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\USBCleaner.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\autoruns.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KPfwSvc.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KISLnchr.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KASMain.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\symlcsvc.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Iparmor.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UmxAgent.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\TrojDie.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavStub.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avconsol.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\PFWLiveUpdate.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ccSvcHst.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AvMonitor.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\IceSword.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\FYFireWall.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavTask.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MagicSet.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UmxAttachment.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Trojanwall.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360tray.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVMonXP_1.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KWatch9x.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcconsol.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\scan32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\EGHOST.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\upiea.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAV32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kabaload.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UIHost.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KvfwMcl.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\SREng.EXE
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVSetup.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\SysSafe.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\vsstat.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\nod32krn.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kvupload.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVStart.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\QQKav.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\QHSET.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KPFW32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\SmartUp.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KMFilter.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UpLive.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KaScrScn.SCR
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RegClean.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rstrui.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVCenter.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RsAgent.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavMon.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mmqczj.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\adam.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KWatch.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\loaddll.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVPF.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Rav.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kvol.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Rsaupd.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVPFW.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avp.com
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\FTCleanerShell.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UmxCfg.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\shcfg32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avp.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KvXP_1.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mmsk.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwsrv.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVSrvXP.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\QQDoctor.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\TrojanDetector.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KMailMon.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\runiep.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AppSvc32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KsLoader.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Ras.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AST.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\WoptiClean.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Navapw32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVDX.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KASTask.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Navapsvc.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kvolself.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgrssvc.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\webscanx.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kvwsc.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ArSwp.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVScan.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AgentSvr.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KPFW32X.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\safelive.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KvReport.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UmxFwHlp.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KvXP.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVMonXP.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVStub.kxp
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KWatchX.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360rpt.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwcfg.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KRegEx.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\HijackThis.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\FileDsty.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavMonD.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\nod32.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwmain.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\PFW.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\CCenter.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\isPwdSvc.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\iparmo.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KvDetect.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\nod32kui.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KRepair.com
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UmxPol.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360Safe.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\NPFMntor.exe
    • Debugger = %Program Files%\Common Files\Microsoft Shared\{Random filename}.exe

Step 6

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • HKEY_CURRENT_USER\Software\{Random key}
  • HKEY_CURRENT_USER\Software\{Random key}

Step 7

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • {Drive Letter}:\autorun.inf
  • %Program Files%\{Random filename}.inf

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT.UOU. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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