Coinminer.MSIL.MALXMR.THAOODAH
HEUR:Trojan.MSIL.Miner.gen (Kaspersky), MSIL/CoinMiner.AQZ!tr (Fortinet)
Windows
Threat Type: Coinminer
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Coinminer arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages.
TECHNICAL DETAILS
Arrival Details
This Coinminer arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It arrives as a component bundled with malware/grayware packages.
Installation
This Coinminer drops the following files:
- %AppDataLocal%\{Random Characters}\SystemProcess.exe
- %User Temp%\{Random Characters}\{Random Characters}.exe ← Coinminer.Win32.MALXMR.TIBAGB
- %System%\Tasks\{Random Characters}
It adds the following processes:
- schtasks.exe /create /tn {Random Characters} /tr %AppDataLocal%\{Random Characters}\SystemProcess.exe /sc minute /mo 1
- %AppDataLocal%\Temp\{Random Characters}\{Random Characters}.exe -o xmr.pool.{BLOCKED}ate.com:45700 -u datildequeso@{BLOCKED}l.com -p x -a cryptonight -t 3 -x %proxy%
Autostart Technique
This Coinminer adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random Characters} = %AppDataLocal%\{Random Characters}\SystemProcess.exe
Other Details
This Coinminer does the following:
- It uses the following details as part of its coinminer routine:
- o:xmr.pool.{BLOCKED}ate.com:45700
- username:datildequeso@{BLOCKED}l.com
- password:x
- a:cryptonight
- t:3
- x:%proxy%
SOLUTION
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
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
Step 4
Search and delete this file
- %AppDataLocal%\{Random Characters}\SystemProcess.exe
- %User Temp%\{Random Characters}\{Random Characters}.exe
- %System%\Tasks\{Random Characters}
Step 5
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
- {Random Characters} = %AppDataLocal%\{Random Characters}\SystemProcess.exe
- {Random Characters} = %AppDataLocal%\{Random Characters}\SystemProcess.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Coinminer.MSIL.MALXMR.THAOODAH. 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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