Modiloader From Obfuscated Batch File

Tags

External References

• https://isc.sans.edu/
• https://otx.alienvault.com/

Description

An investigation of a file named 'Albertsons_payment.GZ' revealed a sophisticated malware delivery chain. The file, initially disguised as an image, was actually a Windows Cabinet file containing an obfuscated batch script. This script employed string slicing techniques to reconstruct commands and used LOLbins like extrac32.exe to evade detection. The payload, identified as Modiloader, a Delphi-based malware, was extracted using certutil.exe. The final stage attempted to fetch additional content from a URL, but failed in the analysis environment. This attack demonstrates the use of complex obfuscation and living-off-the-land techniques to deliver malware.

Date