Analysis

  • max time kernel
    150s
  • max time network
    171s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    25-11-2022 08:43

General

  • Target

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe

  • Size

    2.8MB

  • MD5

    fcf74d4566afb934f07dd834f808c91a

  • SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

  • SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

  • SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • SSDEEP

    6144:De40VFabAt0nvrzCy1GdWEufANJoXiEmJARab8rK5AzVvjn/qK/k8eEJaQXHIQJG:De3Fab

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Retards

C2

192.227.223.11:7707

Mutex

QSR_MUTEX_f16UjmYVpgK3aDIQD0

Attributes
  • encryption_key

    76BTYMCCLlIx8oiGPHIG

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    WindowsWMI

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 7 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 6 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 14 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 1 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 50 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
    "C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe"
    1⤵
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1012
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout 1
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1752
      • C:\Windows\SysWOW64\timeout.exe
        timeout 1
        3⤵
        • Delays execution with timeout.exe
        PID:860
    • C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
      "C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1228
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "WindowsWMI" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:624
      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1068
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c timeout 1
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1604
          • C:\Windows\SysWOW64\timeout.exe
            timeout 1
            5⤵
            • Delays execution with timeout.exe
            PID:1348
        • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
          "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:916
          • C:\Windows\SysWOW64\schtasks.exe
            "schtasks" /create /tn "WindowsWMI" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:1916
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1068 -s 840
          4⤵
          • Loads dropped DLL
          • Program crash
          PID:668

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • \Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • \Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • \Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • \Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • \Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • \Users\Admin\AppData\Roaming\SubDir\Client.exe
    Filesize

    2.8MB

    MD5

    fcf74d4566afb934f07dd834f808c91a

    SHA1

    40ca32e4a614421f6af5afadf51d1cce1a0c64d3

    SHA256

    4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

    SHA512

    54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

  • memory/624-119-0x0000000000000000-mapping.dmp
  • memory/668-142-0x0000000000000000-mapping.dmp
  • memory/860-57-0x0000000000000000-mapping.dmp
  • memory/916-135-0x000000000045818E-mapping.dmp
  • memory/1012-54-0x0000000000930000-0x0000000000C0A000-memory.dmp
    Filesize

    2.9MB

  • memory/1012-69-0x0000000000490000-0x00000000004A0000-memory.dmp
    Filesize

    64KB

  • memory/1012-55-0x00000000020C0000-0x000000000212C000-memory.dmp
    Filesize

    432KB

  • memory/1068-125-0x0000000000B60000-0x0000000000E3A000-memory.dmp
    Filesize

    2.9MB

  • memory/1068-122-0x0000000000000000-mapping.dmp
  • memory/1228-62-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1228-84-0x00000000763F1000-0x00000000763F3000-memory.dmp
    Filesize

    8KB

  • memory/1228-66-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1228-68-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1228-64-0x000000000045818E-mapping.dmp
  • memory/1228-63-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1228-61-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1228-59-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1228-58-0x0000000000400000-0x000000000045E000-memory.dmp
    Filesize

    376KB

  • memory/1348-127-0x0000000000000000-mapping.dmp
  • memory/1604-126-0x0000000000000000-mapping.dmp
  • memory/1752-56-0x0000000000000000-mapping.dmp
  • memory/1916-146-0x0000000000000000-mapping.dmp