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Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs

Severity

Medium

Analysis Summary

Since 2019, Guloader has been in operation as a downloader. GuLoader spreads through spam campaigns with malicious archived attachments. GuLoader downloads the bulk of malware, with the most frequent being AgentTesla, FormBook, and NanoCore. The encrypted payloads of this downloader are usually saved on Google Drive. It also got its payloads from Microsoft OneDrive and websites that were controlled by an attacker. GuLoader can avoid network-based detection by using genuine file-sharing websites, which aren’t often filtered or inspected in corporate contexts.

Impact

  • Information Theft
  • Security Bypass

Indicators of Compromise

MD5

  • 7e5f7597208acf6ff5ece4b5ebf93f74

SHA-256

  • ad33454375e29e06f6a4756f177a73a0f89759953912f22d31ed18ede9f26f7a

SHA-1

  • 69cf573e05266aeb9a81b9a44f3a42976d7356b9

Remediation

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