TROJ_KILLAV.ASQ

October 09, 2012
 Analysis by: Rhena Inocencio
 ALIASES:

Trojan.Win32.KillAV (Ikarus)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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, Downloaded from the Internet

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:

38,784 bytes

File Type:

SYS

Memory Resident:

Yes

Initial Samples Received Date:

13 Jul 2012

Payload:

Terminates processes

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.

NOTES:
This Trojan terminates the following antivirus-related processes if found running in the affected system's memory:

  • AYRTSrv.exe (ALYac Anti-virus RealTime Service)
  • AYRTSrv.aye (ALYac Anti-virus RealTime Service)
  • ALYac.aye (Alyac Main Application)
  • AYUpdSrv.exe (ALYac Update Service)
  • AYUpdSrv.aye (ALYac Update Service)
  • AYAgent.exe (ALYac Agent)
  • AYAgent.aye (ALYac Agent)
  • AYUpdate.aye (ALYac Updater)
  • AYServiceNT.aye (ALYac Service NT)
  • Nsavsvc.npc (Naver Anti-virus Realtime Monitor)
  • Nsavsvc.exe (Naver Anti-virus Realtime Monitor)
  • Nsvmon.npc (Naver Anti-Virus Scan Service)
  • Nsvmon.exe (Naver Anti-Virus Scan Service)
  • NVCAgent.npc (Naver Manager)
  • NVCAgent.exe (Naver Manager)
  • NVCUpgrader.exe (Naver Upgrader)
  • NVCUpgrader.npc (Naver Upgrader)
  • NaverAgent.exe (Naver Agent)
  • AvastSvc.exe (AVAST antivirus Service)
  • avsx.exe (AVAST Browser Antispyware)
  • AvastUI.exe (AVAST UI)
  • ashUpd.exe (AVAST Updater)
  • avp.exe (Kaspersky Anti-Virus)
  • sgsvc.exe (AhnLab SiteGuard Service)
  • V3LSvc.exe (AhnLab V3 Service Application)
  • V3LTray.exe (AhnLab V3 Tray)
  • V3Light.exe (AhnLab V3 Light Framework)
  • V3Medic.exe (AhnLab V3 Light Framework)
  • V3LRun.exe (AhnLab V3 Light Framework)
  • MUpdate2.exe (AhnLab Updater)

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.310.04

FIRST VSAPI PATTERN DATE:

13 Jul 2012

VSAPI OPR PATTERN File:

9.311.00

VSAPI OPR PATTERN Date:

14 Jul 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_KILLAV.ASQ

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_KILLAV.ASQ

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_KILLAV.ASQ. 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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