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
- Malware installation
- detection evation
- Information theft
Indicators of Compromise
MD5
- d0188a804697df3aac629a81f29d8e5d
- d9a67c184649c62be8c3c510d93189f2
- a58681098fb8c073468be72f50c58c4a
- a68ce2ef5b72e391d18a7c8ea823d7fa
- 2b14baa457601b21232eba2e1087973a
- 50a5c906bd0e9dc14ba29525a26ae0fb
SHA-256
- 1f71e60811cd4ae7fa325f13c12e22ac816784d0d5f9a860676e89fc00207dd7
- 508f3034a53963641fcc236e9b4c53952a2e3998c4fe63c860e1537c67475170
- 7d85a2f584b28394a1927b2582db6f92492452c6c716d6d7d774726df769c033
- 953c4425b18b27b736b5cb0e4f15858cff2629f92c1ff51ce248fe6d6cf939bc
- 0c9242b3fbcc69a8ff083e8e3ba039b5a91885f97c06ffbe1f7f1101031e986f
- 837cf2d46ec64ca1470462e54bc5339998cc04f32fe47c4151370df687cdd117
SHA-1
- 77251e09505350b61d26ccfd72be30b1b695920c
- 2e66a2da8cc652f6bdbec74379fcc6fd4b527011
- ec61223e70c44adb79a6cd1f6bddb9b2dab92f71
- 1a7317f6e5ff1105802125633b1962f9c132a9e8
- db7df0b956ad51f0a52707ffd61426c842da64b7
- 3845d7b8e97369e32acfe08c48a9de0cb58731da
Remediation
- Block the threat indicators at their respective controls.
- Search for IOCs in your environment.