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Rewterz Threat Alert – TrickBot Employs Clever New Obfuscation Trick to evade detection

Severity

High

Analysis Summary

On the 100th release of Trickbot, the malware came equipped with new evasion techniques, one capability is to use of an obfuscated batch script launcher to jumpstart malicious executables. TrickBot is a malware infection commonly installed via malicious phishing emails or other malware. When installed, TrickBot will quietly run on a victim’s computer while it downloads other modules to perform different tasks. TrickBot is known to finish an attack by giving access to threat actors who deploy either the Ryuk or Conti ransomware on the compromised network.

scheduled task launching launcher.bat trickbot

Impact

  • Code execution
  • File encryption

Indicators of Compromise

MD5

  • 82e2de0b3b9910fd7f8f88c5c39ef352
  • a5a28b55cd644c7b83b4641c4fdbf3a5
  • ced54af623254201ee2112514270000a
  • 006937f0817a2aa8642097d749208b29

SHA-256

  • ca8ba5d63e096a04a9a2ce76dadf9d33b318235e70d6c0066f1fe36fe1f5bc8a
  • 58c4bea082b2f44f0beab5356ae2bc9bc73c3f13ab0491861bc2ba24690da103
  • 8215816827a07129430ed907b2168748f1f933dbf22865d6fa4da430f2e6728e
  • 6300bfed92e420fd678bdfa83cde8e57b5d3ae99f84915a0e18ef5d25b6d2cba

SHA1

  • 84205724dbca914858dfe5b95d2198e1f87040b3
  • 772851debc5ef85a750577ebbae3cf3592c0b3ce
  • 594f6011422af739b98f503da8d4bc13cc99e85e
  • 1a4d62a326e955f558e81c184080c670e92acf56

Remediation

  • Block all threat indicators at your respective controls.
  • Search for IOCs in your enbironment.