Analysis by: Arianne Grace Dela Cruz
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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: 3,641 bytes
File Type: BAT
Memory Resident: No
Initial Samples Received Date: 31 Jan 2020
Payload: Modifies system registry

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 adds the following processes:

  • "%Program Files%\Malwarebytes' Anti-Malware\unins000.exe" /verysilent /suppressmsgboxes /norestart
  • "%Program Files%\Malwarebytes' Anti-Malware\unins000.exe" /verysilent /suppressmsgboxes /norestart
  • powershell.exe Add-MpPreference -ExclusionPath C:\, C:\Windows

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Paths
C:\ = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Paths
C:\Windows\ = 0

It modifies the following registry entries:

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

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

HKEY_LOCAL_MACHINE\Software\Policies\
Microsoft\Windows Defender
DisableAntiSpyware = 1

(Note: The default value data of the said registry entry is 0.)

Process Termination

This Trojan terminates the following services if found on the affected system:

  • acronisagent
  • acrsch2svc
  • Apache2
  • BackupExecRPCService
  • cbvscservice11
  • cobianbackup 11
  • dcevt32
  • dcstor32
  • firebirdguardiandefaultinstance
  • hMailServer
  • IASJet
  • IBM Domino Diagnostics (CProgramFilesIBMDomino)
  • IBM Domino Server (CProgramFilesIBMDominodata)
  • ibmiasrw
  • IISADMIN
  • klactprx
  • kladminserver
  • klnagent
  • klwebsrv
  • ksnproxy
  • Lotus Domino Server (LotusDominoData)
  • Lotus Notes Single Logon
  • mms
  • mr2kserv
  • MSExchangeADTopology
  • MSExchangeFBA
  • MSExchangeIS
  • MSExchangeSA
  • mssqlfdlauncher
  • MSSQLServerADHelper100
  • omsad
  • PostgreSQL Database Server 8.0
  • QBCFMonitorService
  • QBPOSDBServiceV12
  • QBVSS
  • QuickBooksDB21
  • QuickBooksDB22
  • QuickBooksDB23
  • QuickBooksDB24
  • QuickBooksDB25
  • QuickBooksDB26
  • QuickBooksDB27
  • QuickBooksDB28
  • server Administrator
  • ShadowProtectSvc
  • Simply Accounting Database Connection Manager
  • SPAdminV4
  • SPSearch4
  • SPTimerV4
  • SPTraceV4
  • SPUserCodeV4
  • SPWriterV4
  • SPXService
  • sqlbrowser
  • stc_endpt_svc
  • StorageCraft ImageManager
  • teamviewer
  • VSNAPVSS
  • wbengine
  • WinDefend
  • wrsvc

It terminates the following processes if found running in the affected system's memory:

  • *SQL*
  • agent*
  • apach*
  • avp*
  • avpsus*
  • b1*
  • ba*
  • bd2*
  • be*
  • be*
  • bes10*
  • black*
  • cbservi*
  • cbvscservi*
  • db*
  • hMailServer*
  • IBM*
  • Kaspersky Endpoint Security 10 for Windows*
  • Kaspersky Seamless Update Service*
  • Kaspersky Security Center Network Agent*
  • Kaspersky Security Center Vulnerability Assessment*
  • klnagent*
  • mysql*
  • nservice.exe
  • nslsvice.exe
  • ntrtscan.exe
  • oracle*
  • pg_ctl.exe
  • postg*
  • QB*
  • sage*
  • sap*
  • sql*
  • store.exe
  • team*
  • vapm*
  • vee*
  • veea*
  • wbengine*
  • wrsa.exe

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.654.03
FIRST VSAPI PATTERN DATE: 31 Jan 2020
VSAPI OPR PATTERN File: 15.655.00
VSAPI OPR PATTERN Date: 01 Feb 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

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 Defender\Exclusions\Paths
    • C:\ = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
    • C:\Windows\ = 0

Step 3

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\WinDefend
    • From: Start = "4"
      To: Start = 2
  • In HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender
    • From: DisableAntiSpyware = "0"
      To: DisableAntiSpyware = 1

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.BAT.KILLAV.BD. 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 the following Trend Micro Support pages for more information:


Did this description help? Tell us how we did.