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HKTL_COINMINE
Aliases: W32/Agent.GYWF!tr.dldr(Fortinet), Trojan-Downloader.Agent(Ikarus), variant of Win32/BitCoinMiner.K application(Eset)
Malware type: Hacking Tool
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
In the wild: Yes

This hacking tool arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be manually installed by a user.

It creates folders where it drops its files.


File size: 376,832 bytes
File type: EXE
Memory resident: Yes

Arrival Details

This hacking tool arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be manually installed by a user.

Installation

This hacking tool drops the following file(s)/component(s):

  • %Application Data%\{Variable folder name}\libcurl{random number}.dll
  • %Application Data%\{Variable folder name}\pthreadGC2.dll
  • %Application Data%\{Variable folder name}\{Variable name 1}.vbs
  • %Application Data%\{Variable folder name}\{Variable name 2}.exe - also detected as HKTL_COINMINE

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Variable key name} = "%ApplicationData%\{Variable folder name}\{Variable name 1}.vbs"

NOTES:

This hacking tool requires the existence of %System Root%\Documents to perform its intended routine.

This hacking tool connects to URLs defined in %ApplicationData%\{Variable folder name}\{Variable name 1}.vbs.

Minimum scan engine: 9.300

Step 1

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

Step 2

Restart in Safe Mode

Step 3

Search and delete these folders

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.
%ApplicationData%\{Variable folder name}

Step 4

Delete this registry value

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
    • {Variable key name} = "%ApplicationData%\{Variable folder name}\{Variable name 1}.vbs"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as HKTL_COINMINE. 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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Analysis By: Rika Joi Gregorio
Modified By: Alvin John Nieto