Rewterz Threat Alert – FormBook Malware – Active IOCs
August 21, 2022Rewterz Threat Advisory – CVE-2022-30190: Follina Vulnerability (MSDT) – Active IOCs
August 21, 2022Rewterz Threat Alert – FormBook Malware – Active IOCs
August 21, 2022Rewterz Threat Advisory – CVE-2022-30190: Follina Vulnerability (MSDT) – Active IOCs
August 21, 2022Severity
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
- Malware installation
- detection evation
- Information theft
Indicators of Compromise
MD5
- 8637eea28bcab56e074bd95f3d0d4d62
SHA-256
- 4bbcfb3efb53369512bb0d02f2f1f543050f4fdccd874174aa5a7e2e965c5399
SHA-1
- 4a3757748c469af9462b2cb0dcc1749e08c91ce7
Remediation
- Block the threat indicators at their respective controls.
- Search for IOCs in your environment.