General

  • Target
    https://switchromz.com/zelda-skyward-sword-hd-switch-rom/
  • Sample260912-vmcamattcv

Malware Config

Extracted

Family
  • acrstealer

Version
  • 4.3.8-alpha2

C2
  • imap.brightloop.cc

Decoy
  • azureedge.net

Attributes
  • ddrs

    app-api.clearflux.cc

  • guids

    4d0bf37a-3180-4974-a873-a6ec4d4dc9f9

  • user_agent

    Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.2.6187.130 Safari/537.36

xor.hex

Targets

    • Target
      https://switchromz.com/zelda-skyward-sword-hd-switch-rom/
    • Detects ACRStealer V4.x

    • Family: ACR stealer,GrMsk

      ACR stealer (aka GrMsk stealer) is an infostealer written in C++.

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Executes dropped EXE

    • Indirect Command Execution

      Adversaries may abuse utilities that allow for command execution to bypass security restrictions that limit the use of command-line interpreters.

    • Loads dropped DLL

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v16

Tasks