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Severity
Medium
Analysis Summary
GuLoader is currently being distributed via spam email campaigns with archived attachments that contain the malware. The majority of malware downloaded by GuLoader is commodity malware, with AgentTesla, FormBook, and NanoCore being the most predominant. This downloader typically stores its encrypted payloads on Google Drive. It has also downloaded its payloads from Microsoft OneDrive and also from compromised or attacker-controlled websites. By utilizing legitimate file-sharing websites, GuLoader can evade network-based detection, as these services are not generally filtered or inspected in corporate environments. Usually, the downloaded payloads are encrypted with a hard-coded XOR key embedded in the malware, making it difficult for file-sharing service providers to identify the payload as malicious. This time, GuLoader Shellcode injector is being distributed via a file named “EXTERNAL RFPPAN India Epoxy/PU 2021”. The scope of this campaign so far seems to be global.
Impact
- Malware installation
- Detection evasion
- Information theft
Indicators of Compromise
MD5
- 2d43c9fc5eee0658f1ebdef9d2e4c184
- 6186f5b324b817103f8b2fe202221da2
SHA-256
- c5615a2ab19a2bcd8d33b5a721f04d09218103cfaa4005ee044fe3c583f09d68
- 1c0d93b0cf7a58a0cc6431c0aa5da4a88cbb9522c616006c30c747bd306da191
- 0a6cf16e375fcdee8d7bd236070a75418d777112f54d55b35876733aa579759f
- 5e41dbb4b4494c282396b7a327076ffb498978fc070b3ac7bc0cbcf57e2eba78
SHA1
- a3b96cd35708c5555363e365a1ab14f0de5f355c
- c70e70bb97405c71303694f265b53786d41b73b2
Remediation
- Block all threat indicators at your respective controls.
- Do not download files attached in untrusted emails.
- Do not download files from untrusted sources on the internet.
- Search for IOCs in your environment.