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Home Malware

Wannamine (Cryptominer) – Malware

June 30, 2023
Reading Time: 2 mins read
in Malware, Types of Malware
Name Wannamine
Type of Malware Cryptominer
Date of Initial Activity 2017
Motivation Cryptojacking
Attack Vectors Exploitation of EternalBlue via an unpatched SMB server
Targeted System Windows

Overview

WannaMine is a sophisticated Monero crypto-mining worm that spreads the EternalBlue exploit. WannaMine implements a spreading mechanism and persistence techniques by leveraging the Windows Management Instrumentation (WMI) permanent event subscriptions.

Targets

Regular and corporate users.

Tools/ Techniques Used

WannaMine leverages the EternalBlue exploit to spread and compromise vulnerable hosts. It stores the EternalBlue exploit binaries in a directory located in C:\Windows renamed as “NetworkDistribution.” WannaMine will randomly generate a .dll and service name based on a list of hard-coded strings. It does this in order to maintain persistence on the host. An important behavior to note is that WannaMine doesn’t immediately look to force the EternalBlue exploit.

It first uses a tool called MimiKatz to recover logins and passwords from system memory and infiltrate the system once. If that fails, WannaMine turns to the EternalBlue exploit to complete the task and break in.

Due to the file-less nature of this malware, the following modules never touch the disk so traditional antvirus software cannot detect and clean the infection: Malicious WMI scripts, EternalBlue exploitation module, Mimikatz credential harvesting tool.

References

  1. WannaMine Cryptominer that uses EternalBlue still active
  2. Investigate WannaMine – CryptoJacking Worm
  3. Weeding out WannaMine v4.0: Analyzing and Remediating This Mineware Nightmare
Tags: CryptojackingEternalBlueMalwaremalware nameMoneroWannamineWindows
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