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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, the 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
- Information Theft
- Security Bypass
Indicators of Compromise
MD5
- cfb7bb1e45e00bf507136153347bd085
- 6f22fdd19b3d98a06e7a5ec9ba86f7c3
- cfb7bb1e45e00bf507136153347bd085
- 6f22fdd19b3d98a06e7a5ec9ba86f7c3
SHA-256
- 354da6fb77b3ee3bdb54e8c160fd24f542ff0f4a3aff092c19df3058c4228277
- aaded4fcee9176fe04085b40b5c11861cfbcdf76eea26f508b119eda00ada941
- 354da6fb77b3ee3bdb54e8c160fd24f542ff0f4a3aff092c19df3058c4228277
- aaded4fcee9176fe04085b40b5c11861cfbcdf76eea26f508b119eda00ada941
SHA-1
- b0e6667f0c9bd2c504cf8f932386b7f6c86371ce
- 0b401f224b554921cf864264081565332fee388f
- b0e6667f0c9bd2c504cf8f932386b7f6c86371ce
- 0b401f224b554921cf864264081565332fee388f
Remediation
- Search for IOCs in your environment.
- Block all the threat indicators in their respective controls.
- Do not download files attached in untrusted emails.
- Do not download files from untrusted sources on the internet.