Rewterz Threat Alert – Gootkit Trojan – Active IOCs
August 17, 2021Rewterz Threat Alert – FormBook Malware – Active IOCs
August 17, 2021Severity
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 evasion
- Information theft
Indicators of Compromise
MD5
- 8056c1da01723959661caf103a001271
- a999f70ef203107555ad230346b89c80
- cef00aaa5b2889b6d9ae4d77298c9559
SHA-256
- b05b832ba690f4fee5cb0c810f9a329592ef5736a01f77d2190d7d7d24fe9a0c
- 63349f5e1cb7e662593709d14ed76838362d5b81fd3efedf1b7b307f343fe377
- a3a5266a7acb1335d9e5a4afc026046ccdd824f6c484f3ae1d5d11030ccf65d8
SHA-1
- 94b3b830fa2cdbef62306d497e90a381625b795b
- 2eee21bb0c57c8542b7e0518b662a9a07f47c821
- 09fe3291a0e0f76580874808be00694458297136
Remediation
- Block the threat indicators at their 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.