Modified by: Earle Maui Earnshaw
ALIASES:

Trojan-Dropper.Win32.Agent.bjrycv (Kaspersky); Trojan:Win32/Tiggre!rfn (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Worm 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: 7,561,216 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 14 Mar 2020

Arrival Details

This Worm 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 Worm adds the following processes:

  • %All Users Profile%\Application Data\inetinfo.exe
  • rar.exe a -apC -r -ed -tk -m5 -dh -tl -hpThis0nePiece -ta20191110 %All Users Profile%\DOCUME~1\Media\B23315CA.ldf %System Root%\*.doc %System Root%\*.XLSX
  • %User Temp%\kis.exe
  • rar.exe a -apC -r -ed -tk -m5 -dh -tl -hpThis0nePiece -ta20191111 %All Users Profile%\DOCUME~1\Media\B23315CA.ldf %System Root%\*.doc %System Root%\*.XLSX %System Root%\*.XLSX
  • %User Temp%\kis.exe reg
  • %User Temp%\kis.exe abc 1
  • %System%\cmd.exe /c REG ADD "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v winup /t REG_SZ /d "%User Temp%\kis.exe" /f

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • {Removable Drive}:\RECYCLER
  • %All Users Profile%\Documents\Media
  • {Removable Drive:\Backup

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
inet32 = "%All Users Profile%\Application Data\inetinfo.exe"

Other System Modifications

This Worm deletes the following files:

  • {Removable Drive}:\data.exe

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "12"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "13"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
winup = "%User Temp%\kis.exe"

Dropping Routine

This Worm drops the following files:

  • %User Temp%\kis.exe
  • %User Temp%\temp.vih
  • {Removable Drive}:\data.exe
  • %All Users Profile%\Application Data\inetinfo.exe
  • {Removable Drive}:\Backup.exe

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.740.08
FIRST VSAPI PATTERN DATE: 13 Mar 2020
VSAPI OPR PATTERN File: 15.741.00
VSAPI OPR PATTERN Date: 14 Mar 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

Restart in Safe Mode

[ Learn More ]

Step 4

Identify and terminate files detected as Worm.Win32.HILGILD.C

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 5

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • inet32 = %All Users Profile%\Application Data\inetinfo.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = 12
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = 13
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • winup = %User Temp%\kis.exe

Step 6

Search and delete these components

[ Learn More ]
There may be some components 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%\kis.exe
  • %User Temp%\temp.vih
  • {Removable Drive}:\data.exe
  • %All Users Profile%\Application Data\inetinfo.exe
  • {Removable Drive}:\Backup.exe

Step 7

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.
  • {Removable Drive}:\RECYCLER
  • %All Users Profile%\Documents\Media
  • {Removable Drive}:\Backup

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win32.HILGILD.C. 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.

Step 9

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • {Removable Drive}:\data.exe


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