GuLoader
Description
(Proofpoint) Proofpoint researchers have observed a new downloader in the wild that we and other researchers are calling “GuLoader.” Our researchers first observed GuLoader in late December 2019 being used to deliver Parallax RAT, which itself had recently been released. While we regularly observe new loaders, GuLoader has gained popularity quickly and is in active use by multiple threat actors. GuLoader is a downloader, written partly in VB6, which typically stores its encrypted payloads on Google Drive or Microsoft OneDrive (underscoring that threat actors continue to adopt the cloud just like legitimate businesses are).
GuLoader is a portable executable (PE) file that is often observed embedded in a container file such as an .iso or .rar file. We have also observed it being downloaded directly from various cloud hosting platforms. GuLoader is used predominantly to download remote access Trojans (RATs) and information stealers such as Agent Tesla/Origin Logger, Formbook, NanoCore RAT, NetWire RC, RemcosRAT, Ave Maria/Warzone RAT and Parallax RAT.
Names
| Name |
|---|
| GuLoader |
| vbdropper |
| CloudEyE |
Category
Malware
Type
- Loader
Information
- https://www.proofpoint.com/us/threat-insight/post/guloader-popular-new-vb6-downloader-abuses-cloud-services
- https://blog.malwarebytes.com/threat-analysis/2020/07/malspam-campaign-caught-using-guloader-after-service-relaunch/
- https://www.deepinstinct.com/blog/-down-loaded-by-guloader-malware
- https://unit42.paloaltonetworks.com/guloader-variant-anti-analysis/
- https://www.crowdstrike.com/blog/guloader-dissection-reveals-new-anti-analysis-techniques-and-code-injection-redundancy/
- https://www.trellix.com/en-us/about/newsroom/stories/research/guloader-the-nsis-vantage-point.html
- https://www.esentire.com/blog/guloader-targeting-the-financial-sector-using-a-tax-themed-phishing-lure
- https://www.malwarebytes.com/blog/news/2023/04/guloader-returns-with-a-rotten-shipment
- https://www.mcafee.com/blogs/other-blogs/mcafee-labs/guloader-campaigns-a-deep-dive-analysis-of-a-highly-evasive-shellcode-based-loader/
- https://blog.morphisec.com/guloader-campaign-targets-law-firms-in-the-us
- https://asec.ahnlab.com/en/55978/
- https://www.elastic.co/security-labs/getting-gooey-with-guloader-downloader
- https://unit42.paloaltonetworks.com/malware-configuration-extraction-techniques-guloader-redline-stealer/
- https://www.mcafee.com/blogs/other-blogs/mcafee-labs/guloader-unmasked-decrypting-the-threat-of-malicious-svg-files/
- https://www.cadosecurity.com/blog/guloader-targeting-european-industrial-companies
Mitre Attack
Malpedia
- https://malpedia.caad.fkie.fraunhofer.de/details/win.cloudeye
- https://malpedia.caad.fkie.fraunhofer.de/details/win.guloader
Alienvault Otx
Other Information
Uuid
835729de-277b-4407-a4a6-4f6ad64b853f
Last Card Change
2024-12-26