Rewterz Threat Alert – Ursnif Banking Trojan – Active IOCs
September 24, 2021Rewterz Threat Alert – NJRAT – Active IOCs
September 24, 2021Rewterz Threat Alert – Ursnif Banking Trojan – Active IOCs
September 24, 2021Rewterz Threat Alert – NJRAT – Active IOCs
September 24, 2021Severity
High
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
- ff7cda5f1f8d4bd3163b5fe02731529d
- 83c12d2c11d79a56cf541d34ebcc17df
SHA-256
- f36f8e7c9cfbd9fff857f66c65fa2780a0081f5339ebc18c664b26961ff1b5e8
- e7c8915458db610ddac09dd87b544b70a2aaa9f17024ee359ee4a8f39096f3b0
SHA-1
- 27539d75daf7c36a1dc118bb695d00a7897116c4
- 04f73a82fba11a1f3eb4207e1ab39344b785a72c
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.