Windows – SvcHost is taking 100% of CPU. It appears to be either DcomLaunch or TermService – virus

cpu usagesvchostviruswindows xp

So my SvcHost is all of a sudden taking 100% of my CPU, and I'd like to figure out which service is responsible for this. Is there any way to differentiate the load being generated by the multiple services running in a single SvcHost?

I have run a virus scan and it came up clean my tool is old and outdated so it found nothing.

I tried stepping through the services, stopping them one by one, but I couldn't find the culprit (note some services also auto restarted and I didn't want to disable them).


Update: I used Process Explorer last night but there were many services, some of which couldn't be stopped, in the offending SvcHost. Today I checked again at heavyd's suggestion and got lucky because only two services are in the offending SvcHost today.

DcomLaunch – DCOM Server Process Launcher

TermService – Terminal Services

Neither of which are stoppable. I am up to date on Windows updates. Going to run another virus scan for the heck of it although nothing turned up last night. Maybe it's time for a fresh start (this install is from sometime in 2004).


Update: Definitely a virus. After the last reboot the CPU usage dropped, but I got some odd "Security Software Installed" messages at boot, oddly named processes running (for example, 555573478785.exe), and suspicious keys added to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run that were not there last night.

Symantec AntiVirus Corporate 8.1.0.825 presented some warnings, but it doesn't seem to be catching everything 🙁


Malwarebytes' Anti-Malware results:

Malwarebytes' Anti-Malware 1.44
Database version: 3763
Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

2/19/2010 12:12:58 PM
mbam-log-2010-02-19 (12-12-58).txt

Scan type: Full Scan (C:\|D:\|)
Objects scanned: 290960
Time elapsed: 1 hour(s), 23 minute(s), 54 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 1
Registry Keys Infected: 25
Registry Values Infected: 1
Registry Data Items Infected: 1
Folders Infected: 1
Files Infected: 6

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
C:\WINDOWS\kbabjtm.dll (Trojan.Hiloti) -> Delete on reboot.

Registry Keys Infected:
HKEY_CLASSES_ROOT\Interface\{2e9937fc-cf2f-4f56-af54-5a6a3dd375cc} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\Interface\{741de825-a6f0-4497-9aa6-8023cf9b0fff} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\Interface\{cf54be1c-9359-4395-8533-1657cf209cfe} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\CLSID\{147a976f-eee1-4377-8ea7-4716e4cdd239} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CLASSES_ROOT\Typelib\{d518921a-4a03-425e-9873-b9a71756821e} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\SearchScopes\{56256a51-b582-467e-b8d4-7786eda79ae0} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{00a6faf1-072e-44cf-8957-5838f569a31d} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{07b18ea1-a523-4961-b6bb-170de4475cca} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{07b18ea9-a523-4961-b6bb-170de4475cca} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{07b18eab-a523-4961-b6bb-170de4475cca} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{1d4db7d2-6ec9-47a3-bd87-1e41684e07bb} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{25560540-9571-4d7b-9389-0f166788785a} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{3dc201fb-e9c9-499c-a11f-23c360d7c3f8} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{63d0ed2c-b45b-4458-8b3b-60c69bbbd83c} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats\{9ff05104-b030-46fc-94b8-81276e4e27df} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Code Store Database\Distribution Units\{1d4db7d2-6ec9-47a3-bd87-1e41684e07bb} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{59c7fc09-1c83-4648-b3e6-003d2bbc7481} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{68af847f-6e91-45dd-9b68-d6a12c30e5d7} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{9170b96c-28d4-4626-8358-27e6caeef907} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{d1a71fa0-ff48-48dd-9b6d-7a13a3e42127} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{ddb1968e-ead6-40fd-8dae-ff14757f60c7} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{f138d901-86f0-4383-99b6-9cdd406036da} (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\SearchScopes\{56256a51-b582-467e-b8d4-7786eda79ae0} (Trojan.Vundo) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Low Rights\RunDll32Policy\f3ScrCtr.dll (Adware.MyWebSearch) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Multimedia\WMPlayer\Schemes\f3pss (Adware.MyWebSearch) -> Quarantined and deleted successfully.

Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\MenuExt\&Search\(default) (Adware.Hotbar) -> Quarantined and deleted successfully.

Registry Data Items Infected:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\LSA\Notification Packages (Trojan.Vundo.H) -> Data: kbabjtm.dll  -> Delete on reboot.

Folders Infected:
C:\Documents and Settings\All Users\Application Data\55533526 (Rogue.Multiple) -> Quarantined and deleted successfully.

Files Infected:
C:\WINDOWS\kbabjtm.dll (Trojan.Vundo.H) -> Delete on reboot.
C:\WINDOWS\Temp\~TM17.tmp (Trojan.Downloader) -> Quarantined and deleted successfully.
C:\WINDOWS\Temp\~TM466.tmp (Trojan.Hiloti) -> Quarantined and deleted successfully.
C:\Documents and Settings\mach\Local Settings\Temporary Internet Files\Content.IE5\2WE7TOVW\load[1].exe (Malware.Packer.Gen) -> Quarantined and deleted successfully.
C:\Documents and Settings\mach\Application Data\avdrn.dat (Malware.Trace) -> Quarantined and deleted successfully.
C:\Documents and Settings\mach\Start Menu\Programs\Startup\monnid32.exe (Trojan.Bredolab) -> Delete on reboot.

Second scan results:

Malwarebytes' Anti-Malware 1.44
Database version: 3763
Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

2/19/2010 1:54:07 PM
mbam-log-2010-02-19 (13-54-07).txt

Scan type: Full Scan (C:\|D:\|)
Objects scanned: 290753
Time elapsed: 1 hour(s), 18 minute(s), 34 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\System Volume Information\_restore{0D9A148D-2E7E-411F-8807-407114206A75}\RP2138\A0129104.dll (Trojan.Hiloti) -> Quarantined and deleted successfully.
C:\System Volume Information\_restore{0D9A148D-2E7E-411F-8807-407114206A75}\RP2138\A0129105.exe (Malware.Packer.Gen) -> Quarantined and deleted successfully.

Update: After a couple more scans it looks like my PC no longer has a virus.

Thanks everyone!

Best Answer

I would suggest grabbing Microsoft/SysInternals Process Explorer. With process explorer you can open the specific svchost process and see which services are being run from that process. You can then use the "Services" tab in the process details to stop individual services to find the culprit.