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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

  • 27058a268edac551c33098581d44d5c3

SHA-256

  • 650e7d880c7e2658ab75bdc57d1061bc29f0c077e8d0fba29869c0655af839d0

SHA-1

  • a1fbd5e7fba002158a55a7f846e5a14896680643

Remediation

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