General

  • Target

    af1082c667a09a0f1f6adb041ca37d34.bin

  • Size

    3.5MB

  • Sample

    240425-cc56vadd71

  • MD5

    28be0836816774784af40770ab4c116c

  • SHA1

    9834884f8a4dfb5fd734141a3bf6ad6f2e452471

  • SHA256

    112de62c8a7b20a27314379380e197da5d4469d1fd3385bc6c8db0d0dd377027

  • SHA512

    4a2c835ece78722ea42d1367adca46e541bc83db75e941bd3bf0bd58414b02d09bf66b40bb2328cd0cd0358fc1eef5cdb06119e59500f3c912ec91757822b660

  • SSDEEP

    98304:2QQl1IPU5XwGMfSiEgaMA8y5IWJ/1M7RRwFNC66ha8C:2QcIPawGMfSibaMA8y5IGMF0CH08C

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Slave

C2

157.20.182.46:4782

Mutex

a5764ae9-1c39-4533-95ca-a5d90dae860a

Attributes
  • encryption_key

    BA20F732417E96C201B42F315FAD6CF773D77589

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Client

  • subdirectory

    SubDir

Targets

    • Target

      28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe

    • Size

      3.5MB

    • MD5

      af1082c667a09a0f1f6adb041ca37d34

    • SHA1

      ccb770b00596a1d2fa0d9d7d3dbe9451734a30f9

    • SHA256

      28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6

    • SHA512

      4d1c50b42077ec0a8f0060410e75201e920b951f299e8d9a247fb4ba3c920ef5d16f7b30e2decef5323d88e28e3daeee60ae3fcd1e00de36e0185336b1582404

    • SSDEEP

      98304:p99xyD6/xKyfNf6wZsi/0+zqEsf+JQgWq:rXIc7fNf6Y4EsWxR

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • UAC bypass

    • Windows security bypass

    • Looks for VirtualBox Guest Additions in registry

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Windows security modification

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Maps connected drives based on registry

      Disk information is often read in order to detect sandboxing environments.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v13

Execution

Scheduled Task/Job

1
T1053

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Scheduled Task/Job

1
T1053

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Scheduled Task/Job

1
T1053

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

3
T1562

Disable or Modify Tools

3
T1562.001

Modify Registry

5
T1112

Virtualization/Sandbox Evasion

2
T1497

Discovery

Query Registry

6
T1012

Virtualization/Sandbox Evasion

2
T1497

System Information Discovery

5
T1082

Peripheral Device Discovery

1
T1120

Tasks