Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It disables antivirus services. This is done to allow this malware to perform its routines, avoiding removal from the system.

  TECHNICAL DETAILS

File Size: 46,336 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 03 Dec 2009

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_GERAL.AA

Autostart Technique

This Trojan adds the following Image File Execution Options registry entries to automatically execute itself whenever certain applications are run:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{application name}
{application name} = "scvhost.exe"

Other System Modifications

Where {application name} may be any of the following:

  • 360Safebox.exe
  • 360tray.exe
  • AgentSvr.exe
  • CCenter.exe
  • DrUpdate.exe
  • FrameworkService.exe
  • KISSvc.exe
  • KPFW32.exe
  • KPfwSvc.exe
  • KVSrvXP.exe
  • KWatch.exe
  • KavStart.exe
  • MPMon.exe
  • MPSVC.exe
  • MPSVC1.exe
  • MPSVC2.exe
  • McProxy.exe
  • McTray.exe
  • MpfSrv.exe
  • QQDoctor.exe
  • QQDoctorRtp.exe
  • Rav.exe
  • RavMon.exe
  • RavMonD.exe
  • RavStub.exe
  • RavTask.exe
  • RegGuide.exe
  • RsAgent.exe
  • RsTray.exe
  • SHSTAT.exe
  • ScanFrm.exe
  • Uplive.exe
  • antiarp.exe
  • avp.exe
  • bdagent.exe
  • ccEvtMgr.exe
  • ccSetMgr.exe
  • ccSvcHst.exe
  • ccapp.exe
  • defwatch.exe
  • egui.exe
  • ekrn.exe
  • engineserver.exe
  • kmailmon.exe
  • livesrv.exe
  • mcagent.exe
  • mcinsupd.exe
  • mcmscsvc.exe
  • mcnasvc.exe
  • mcshell.exe
  • mcshield.exe
  • mcsysmon.exe
  • mcupdmgr.exe
  • mfeann.exe
  • mfevtps.exe
  • naPrdMgr.exe
  • rfwsrv.exe
  • rsnetsvr.exe
  • rtvscan.exe
  • safeboxTray.exe
  • udaterui.exe
  • vptray.exe
  • vsserv.exe
  • vstskmgr.exe
  • xcommsvr.exe

Process Termination

This Trojan disables antivirus services by terminating the following services if found on the affected system:

  • CCENTER.EXE

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 6.668.04
FIRST VSAPI PATTERN DATE: 03 Dec 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

Remove the malware/grayware file that dropped/downloaded TROJ_KILLAV.RCC

    TROJ_GERAL.AA

Step 3

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.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
    • {application name}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_KILLAV.RCC. 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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