General

  • Target

    FortniteExternal.exe

  • Size

    39KB

  • Sample

    241221-xgr51awnds

  • MD5

    cffb27bf1ba05391482df627dc8504e4

  • SHA1

    c7deb87c21a1bb2b97e3ded00edf56578acf3aac

  • SHA256

    a9a90a7ba273affb69647f2eabb614e4dcd2c6acbb82c2b1bb3cb4b936e5fffe

  • SHA512

    9132d00fadc97bca3a6246f86bfc745d18227928ecd8a66e2495e788ce628df41b3eaf5270a25f2c7818aef41765a18a3ecb09c2aed3ac47d9d02894098ac1ee

  • SSDEEP

    768:xldEjfYrbTQA+mzUMDmNwS9yVSErxnXneI6zDf9BQj0/nyc3v:xld8mzJmPqSExgzDft/nFv

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Runtime Broker

C2

92.221.125.55:49868

Mutex

73f0bf3a-83f3-424b-b7a1-a8200df3e317

Attributes
  • encryption_key

    5CB2755608EFDB1313EF4F2ACEA101833F5AEE2B

  • install_name

    Runtime Broker.exe

  • log_directory

    Logs

  • reconnect_delay

    100

  • startup_key

    System

  • subdirectory

    SubDir

Targets

    • Target

      FortniteExternal.exe

    • Size

      39KB

    • MD5

      cffb27bf1ba05391482df627dc8504e4

    • SHA1

      c7deb87c21a1bb2b97e3ded00edf56578acf3aac

    • SHA256

      a9a90a7ba273affb69647f2eabb614e4dcd2c6acbb82c2b1bb3cb4b936e5fffe

    • SHA512

      9132d00fadc97bca3a6246f86bfc745d18227928ecd8a66e2495e788ce628df41b3eaf5270a25f2c7818aef41765a18a3ecb09c2aed3ac47d9d02894098ac1ee

    • SSDEEP

      768:xldEjfYrbTQA+mzUMDmNwS9yVSErxnXneI6zDf9BQj0/nyc3v:xld8mzJmPqSExgzDft/nFv

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar family

    • Quasar payload

    • Xmrig family

    • xmrig

      XMRig is a high performance, open source, cross platform CPU/GPU miner.

    • XMRig Miner payload

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Downloads MZ/PE file

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Adds Run key to start application

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

MITRE ATT&CK Enterprise v15

Tasks