TROJ_GERAL.BN


 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

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.

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

  TECHNICAL DETAILS

File Size:

41,917 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

28 Jul 2010

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 copies of itself into the affected system:

  • %System%\kav.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It creates the following folders:

  • %Program Files%\KAV

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
kav = "%System%\kav.exe"

It 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}
{application} = "svchost.exe"

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

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

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

  • uDongFangYu.exe
  • 360Safebox.exe
  • 360SoftMgrSvc.exe
  • 360delays.exe
  • 360realpro.exe
  • 360rp.exe
  • 360safe.exe
  • 360sd.exe
  • 360tray.exe
  • AgentSvr.exe
  • CCenter.exe
  • DSMain.exe
  • DrUpdate.exe
  • DrvAnti.exe
  • FrameworkService.exe
  • KABackReport.exe
  • KISSvc.exe
  • KPFW32.exe
  • KPfwSvc.exe
  • KSWebShield.exe
  • KVSrvXP.exe
  • KWatch.exe
  • KavStart.exe
  • LiveUpdate360.exe
  • MPMon.exe
  • MPSVC.exe
  • MPSVC1.exe
  • MPSVC2.exe
  • McProxy.exe
  • McTray.exe
  • MpfSrv.exe
  • QQDoctor.exe
  • QQDoctorRtp.exe
  • QQDrNetMon.exe
  • Rav.exe
  • RavMon.exe
  • RavMonD.exe
  • RavStub.exe
  • RavTask.exe
  • RegGuide.exe
  • RsAgent.exe
  • RsTray.exe
  • SHSTAT.exe
  • ScanFrm.exe
  • Uplive.exe
  • XsClient.exe
  • alg.exe
  • antiarp.exe
  • avp.exe
  • bdagent.exe
  • ccEvtMgr.exe
  • ccSetMgr.exe
  • ccSvcHst.exe
  • ccapp.exe
  • defwatch.exe
  • egui.exe
  • ekrn.exe
  • engineserver.exe
  • kaccore.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
  • nbmanti.exe
  • qutmserv.exe
  • rfwsrv.exe
  • rsnetsvr.exe
  • rssafety.exe
  • rtvscan.exe
  • safeboxTray.exe
  • udaterui.exe
  • vptray.exe
  • vsserv.exe
  • vstskmgr.exe
  • xcommsvr.exe

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\{random}.exe
  • %System%\jxgamepacik.pak
  • %System%\drivers\TvPlus.sys

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}sdns.com:18184/c/d.txt
  • http://{BLOCKED}sdns.com:18184/c/host.txt
  • http://{BLOCKED}12tj.com:18888/57/tj.asp?mac={mac address}&ver={version}&os={OS}&dtime={date}

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

7.342.04

FIRST VSAPI PATTERN DATE:

28 Jul 2010

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

Restart in Safe Mode

[ Learn More ]

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}

Step 4

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\Run
    • kav = "%System%\kav.exe"

Step 5

Search and delete these files

[ Learn More ]
There may be some component 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.
%User Temp%\{random}.exe
%System%\jxgamepacik.pak
%System%\drivers\TvPlus.sys

Step 6

Search and delete these folders

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

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_GERAL.BN. 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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