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Rewterz Threat Alert – New Monero Cryptominer Discovered

Severity

Medium

Analysis Summary

A new Monero cryptominer has been discovered by Deep Instinct during an incident targeting an Asia-based aviation organization. This miner is persistent, file-less, and leverages the Tor infrastructure. The infection chain begins with a PowerShell command that creates a scheduled task set to run another encoded PowerShell command at system startup. This 2nd encoded PowerShell command, when decoded, reveals the use of a reflective-PE loader that retrieves malicious content stored in the registry and injects it into its own process as run-time compiled C# code.

flow.png

Impact

  • Crypto-Mining malware
  • Sharp spike in CPU usage

Indicators of Compromise

MD5

  • 3866532d537df4795d88f97c38c1c25a
  • 4a7d5d67ce8e6a890f4a272be3f782bd
  • a381ba89d294f120dd76a684bda24276

URL

http[:]//165[.]22[.]50[.]215/functionupdate[.]exe

Remediation

  • Block all threat indicators at your respective controls.
  • Always be suspicious about emails sent by unknown senders.
  • Never click on the links/attachments sent by unknown senders.