IronTiger APT campaign: New HyperBro and SysUpdate samples

 
Community Feature - @BushidoToken

A Curated Intelligence staff member - BushidoToken - recently uncovered new samples of the HyperBro and SysUpdate backdoor, connected to the IronTiger APT group (also known as LuckyMouse or APT27).

https://twitter.com/Cyjax_Ltd/status/1456926491569176576

Just as before, the group uses multiple components: a genuine loader typically with signed certification (here CyberArk Viewfinity); malicious DLL loader loaded from the former component via DLL hijacking; encrypted and compressed blob (thumb.dat) that decrypts to PE-based payload with C2 information (config.ini) hardcoded.

Analysis of the code-signing certificates (Thumbprint: E5F7F5449C22F0A01DCFAC634732E2197AFCDD4C) used by IronTiger revealed that the group used a certificate from Cheetah Mobile, a Chinese mobile Internet company headquartered in Beijing.

Indicators of compromise (IOCs) are available on OTX Alienvault here.


Curated Intel Community Features are sourced using our Member Content channel on Discord. If you have recently produced a noteworthy piece of writing, a project, a podcast, an infographic or other CTI content let us know!