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Trojan.Win64.KILLAV.YXDFGZ

November 21, 2024
 Analysis by: Francesca Villasanta
 ALIASES:

UDS:HackTool.Win64.Agent.a (KASPERSKY); Trojan:Win64/SpyBoy.SA!MTB (MICROSOFT)

 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:

1,291,264 bytes

File Type:

EXE

File Compression:

Varies

Memory Resident:

Yes

Initial Samples Received Date:

07 Jun 2023

Payload:

Drops files, Terminates processes, Displays message/message boxes

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.

Process Termination

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

  • activeconsole
  • anti malware
  • anti-malware
  • antimalware
  • anti virus
  • anti-virus
  • antivirus
  • appsense
  • authtap
  • avast
  • avecto
  • canary
  • carbonblack
  • carbon black
  • cb.exe
  • ciscoamp
  • cisco amp
  • countercept
  • countertack
  • cramtray
  • crssvc
  • crowdstrike
  • csagent
  • csfalcon
  • csshell
  • cybereason
  • cyclorama
  • cylance
  • cyoptics
  • cyupdate
  • cyvera
  • cyserver
  • cytray
  • darktrace
  • defendpoint
  • defender
  • eectrl
  • elastic
  • endgame
  • f-secure
  • forcepoint
  • fireeye
  • groundling
  • GRRservic
  • inspector
  • ivanti
  • kaspersky
  • lacuna
  • logrhythm
  • malware
  • mandiant
  • mcafee
  • morphisec
  • msascuil
  • msmpeng
  • nissrv
  • omni
  • omniagent
  • osquery
  • Palo Alto Networks
  • pgeposervice
  • pgsystemtray
  • privilegeguard
  • procwall
  • protectorservic
  • qradar
  • redcloak
  • secureworks
  • securityhealthservice
  • semlaunchsv
  • sentinel
  • sepliveupdat
  • sisidsservice
  • sisipsservice
  • sisipsutil
  • smc.exe
  • smcgui
  • snac64
  • sophos
  • splunk
  • srtsp
  • symantec
  • symcorpu
  • symefasi
  • sysinternal
  • sysmon
  • tanium
  • tda.exe
  • tdawork
  • tpython
  • vectra
  • wincollect
  • windowssensor
  • wireshark
  • threat
  • xagt.exe
  • xagtnotif.exe

Other Details

This Trojan adds and runs the following services:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Terminator
ImagePath = \??\{Path of File}\Terminator.sys

It does the following:

  • It requires the existence of the following file in the same directory as the malware to be able to proceed to its malicious behavior:
    • Terminator.sys → renamed Zemana Anti-Malware driver
  • It checks for the existence of the following service and starts it if found:
    • Service Name: Terminator

    If the service above is not found, it is then created with the following details and started subsequently:
    • Name: Terminator
    • Display Name: Terminator
    • Type: Driver
    • Start Type: Demand start
    • Binary Path: {Path of File}\Terminator.sys
  • It checks if the service "Terminator" has been successfully executed by obtaining a handle to the device object named:
    • \.\ZemanaAntiMalware
  • It sends a specific control code to the Zemana Anti-Malware driver, along with the current running process ID, to add itself to the driver's trusted list of processes.
  • It sends a specific control code to the Zemana Anti-Malware driver, along with the process ID of the process to be terminated found running in the machine, to terminate it.
  • It displays the following upon execution:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.495.00

FIRST VSAPI PATTERN DATE:

07 Jun 2023

VSAPI OPR PATTERN File:

18.495.00

VSAPI OPR PATTERN Date:

08 Jun 2023

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    Troj.Win32.TRX.XXPE50FFF072

Step 2

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 3

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 4

Restart in Safe Mode, and then 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\SYSTEM\CurrentControlSet\Services\Terminator

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win64.KILLAV.YXDFGZ. 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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