General

  • Target

    SolaraBootstrapper.exe

  • Size

    3.1MB

  • Sample

    240722-h497rsvfpq

  • MD5

    bbbb22e8acf9122b4f0ced4a7b8f02fb

  • SHA1

    56e3e71ba4cc2bef9b2dc78a6b20eab5312237e9

  • SHA256

    cf928d66dd4e9deffeffdec3dab6d3f17aa7d3bfa40b31ed69f3d750ec63574b

  • SHA512

    9a5b66248d9d4188be92084b0e35811e94d20f38fc4cac7ad322bdcfeb5f17d32f3e68c357c1c47a7febae4d858c96a29d981baeae9bb607be0f9050f74d0388

  • SSDEEP

    49152:KvyI22SsaNYfdPBldt698dBcjHafM30ar7LoGdNYTHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHN3l9

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.254.166:4782

Mutex

d6b04272-e4a0-454d-92f8-0e055434ec16

Attributes
  • encryption_key

    65428E984B25214BF6CCB9AD2C330DA60A548220

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Targets

    • Target

      SolaraBootstrapper.exe

    • Size

      3.1MB

    • MD5

      bbbb22e8acf9122b4f0ced4a7b8f02fb

    • SHA1

      56e3e71ba4cc2bef9b2dc78a6b20eab5312237e9

    • SHA256

      cf928d66dd4e9deffeffdec3dab6d3f17aa7d3bfa40b31ed69f3d750ec63574b

    • SHA512

      9a5b66248d9d4188be92084b0e35811e94d20f38fc4cac7ad322bdcfeb5f17d32f3e68c357c1c47a7febae4d858c96a29d981baeae9bb607be0f9050f74d0388

    • SSDEEP

      49152:KvyI22SsaNYfdPBldt698dBcjHafM30ar7LoGdNYTHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHN3l9

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • Executes dropped EXE

    • Loads dropped DLL

    • Blocklisted process makes network request

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks