Resubmissions

28/03/2024, 18:55

240328-xk1xbade8v

28/03/2024, 18:55

240328-xkvejaee53

28/03/2024, 18:45

240328-xd9kwadd4t10

Analysis

  • max time kernel
    154s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/03/2024, 18:45

General

  • Target
    Quasar.exe
  • Size 8.0MB
  • Sample240328-xd9kwadd4t
  • SHA256 6acec4a4a735297616310dfbe21f95510ce4eccab39c778ec1a628ec6b905255
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • v0.1

C2
  • serveo.net:11453

Mutex
  • abff0131-e47c-48a9-acbf-670ddd76b7c2

Attributes
  • encryption_key

    86DD7DA02996F71324EA9A66B712B0F1735056E7

  • install_name

    APF.exe

  • log_directory

    ms_ess

  • reconnect_delay

    3000

  • startup_key

    Microsoft application

  • subdirectory

    ms_essentials

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 6 IoCs
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 15 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Quasar.exe
    "C:\Users\Admin\AppData\Local\Temp\Quasar.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3912
    • C:\Users\Admin\AppData\Local\Temp\Quasar.exe
      "C:\Users\Admin\AppData\Local\Temp\Quasar.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:3168
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "v.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:492
        • C:\Users\Admin\AppData\Local\Temp\v.exe
          v.exe
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1440
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks" /create /tn "Microsoft application" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\ms_essentials\APF.exe" /rl HIGHEST /f
            5⤵
            • Creates scheduled task(s)
            PID:1104
          • C:\Users\Admin\AppData\Roaming\ms_essentials\APF.exe
            "C:\Users\Admin\AppData\Roaming\ms_essentials\APF.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:2808
            • C:\Windows\SYSTEM32\schtasks.exe
              "schtasks" /create /tn "Microsoft application" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\ms_essentials\APF.exe" /rl HIGHEST /f
              6⤵
              • Creates scheduled task(s)
              PID:3004
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "Quasar.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1544
        • C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\Quasar.exe
          Quasar.exe
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          PID:2816

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        Quasar.Common.dll

        • Path C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\Quasar.Common.dll
        • Size 62KB
        • SHA256 de930a748e4dc08c851ba0a22afce8dcfd0f15f23b291f9306c8ef6ccd7460a2
        • MD5 SHA1 SHA512 SSDEEP

        Quasar.exe

        • Path C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\Quasar.exe
        • Size 1.2MB
        • SHA256 43315abb9c8be9a39782bd8694a7ea9f16a867500dc804454d04b8bf2c15c51e
        • MD5 SHA1 SHA512 SSDEEP

        Quasar.exe.config

        • Path C:\Users\Admin\AppData\Local\Temp\Quasar v1.4.1\Quasar.exe.config
        • Size 176B
        • SHA256 b44739eeff82db2b575a45b668893e2fe8fdd24a709cbf0554732fd3520b2190
        • MD5 SHA1 SHA512

        VCRUNTIME140.dll

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\VCRUNTIME140.dll
        • Size 116KB
        • SHA256 4d292623516f65c80482081e62d5dadb759dc16e851de5db24c3cbb57b87db83
        • MD5 SHA1 SHA512 SSDEEP

        _bz2.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_bz2.pyd
        • Size 82KB
        • SHA256 bd8621fcc901fa1de3961d93184f61ea71068c436794af2a4449738ccf949946
        • MD5 SHA1 SHA512 SSDEEP

        _decimal.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_decimal.pyd
        • Size 247KB
        • SHA256 d4ae192bbd4627fc9487a2c1cd9869d1b461c20cfd338194e87f5cf882bbed12
        • MD5 SHA1 SHA512 SSDEEP

        _hashlib.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_hashlib.pyd
        • Size 64KB
        • SHA256 6c50c9801a5caf0bb52b384f9a0d5a4aa182ca835f293a39e8999cf6edf2f087
        • MD5 SHA1 SHA512 SSDEEP

        _lzma.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_lzma.pyd
        • Size 155KB
        • SHA256 22d10e2d6ad3e3ed3c49eb79ab69a81aaa9d16aeca7f948da2fe80877f106c16
        • MD5 SHA1 SHA512 SSDEEP

        _queue.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_queue.pyd
        • Size 31KB
        • SHA256 d43dca0e00c3c11329b68177e967cf5240495c4786f5afa76ac4f267c3a5cdb9
        • MD5 SHA1 SHA512 SSDEEP

        _socket.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_socket.pyd
        • Size 81KB
        • SHA256 24017d664af20ee3b89514539345caac83eca34825fcf066a23e8a4c99f73e6d
        • MD5 SHA1 SHA512 SSDEEP

        _ssl.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\_ssl.pyd
        • Size 173KB
        • SHA256 2b6f1b1ac47cb7878b62e8d6bb587052f86ca8145b05a261e855305b9ca3d36c
        • MD5 SHA1 SHA512 SSDEEP

        base_library.zip

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\base_library.zip
        • Size 1.3MB
        • SHA256 6af8511d62e7e7ed1805a07edd05a7fa83a728f0d24f92e7ed498ae01a0b92f2
        • MD5 SHA1 SHA512 SSDEEP

        cacert.pem

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\certifi\cacert.pem
        • Size 285KB
        • SHA256 7a347ca8fef6e29f82b6e4785355a6635c17fa755e0940f65f15aa8fc7bd7f92
        • MD5 SHA1 SHA512 SSDEEP

        md.cp312-win_amd64.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\charset_normalizer\md.cp312-win_amd64.pyd
        • Size 10KB
        • SHA256 ecf12e2c0a00c0ed4e2343ea956d78eed55e5a36ba49773633b2dfe7b04335c0
        • MD5 SHA1 SHA512 SSDEEP

        md__mypyc.cp312-win_amd64.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\charset_normalizer\md__mypyc.cp312-win_amd64.pyd
        • Size 120KB
        • SHA256 4107b1d6f11d842074a9f21323290bbe97e8eed4aa778fbc348ee09cc4fa4637
        • MD5 SHA1 SHA512 SSDEEP

        libcrypto-3.dll

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\libcrypto-3.dll
        • Size 4.9MB
        • SHA256 2a234b5aa20c3faecf725bbb54fb33f3d94543f78fa7045408e905593e49960a
        • MD5 SHA1 SHA512 SSDEEP

        libssl-3.dll

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\libssl-3.dll
        • Size 771KB
        • SHA256 41ad1a04ca27a7959579e87fbbda87c93099616a64a0e66260c983381c5570d1
        • MD5 SHA1 SHA512 SSDEEP

        python312.dll

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\python312.dll
        • Size 6.7MB
        • SHA256 0cc4e557972488eb99ea4aeb3d29f3ade974ef3bcd47c211911489a189a0b6f2
        • MD5 SHA1 SHA512 SSDEEP

        select.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\select.pyd
        • Size 29KB
        • SHA256 74cca85600e7c17ea6532b54842e26d3cae9181287cdf5a4a3c50af4dab785e5
        • MD5 SHA1 SHA512 SSDEEP

        unicodedata.pyd

        • Path C:\Users\Admin\AppData\Local\Temp\_MEI39122\unicodedata.pyd
        • Size 1.1MB
        • SHA256 2a50d629895a05b10a262acf333e7a4a31db5cb035b70d14d1a4be1c3e27d309
        • MD5 SHA1 SHA512 SSDEEP

        v.exe

        • Path C:\Users\Admin\AppData\Local\Temp\v.exe
        • Size 3.1MB
        • SHA256 9f01ab687c4a917094f721ea2c496ecd567c0705c36ad74c4ca465ab130bda00
        • MD5 SHA1 SHA512 SSDEEP

        memory/1440-53-0x00000000000C0000-0x00000000003E4000-memory.dmp

        memory/1440-55-0x000000001B170000-0x000000001B180000-memory.dmp

        memory/1440-63-0x00007FFDFA3A0000-0x00007FFDFAE61000-memory.dmp

        memory/1440-54-0x00007FFDFA3A0000-0x00007FFDFAE61000-memory.dmp

        memory/2808-101-0x00007FFDFA3A0000-0x00007FFDFAE61000-memory.dmp

        memory/2808-89-0x000000001C980000-0x000000001CA32000-memory.dmp

        memory/2808-88-0x000000001C870000-0x000000001C8C0000-memory.dmp

        memory/2808-62-0x00007FFDFA3A0000-0x00007FFDFAE61000-memory.dmp

        memory/2816-99-0x00000268F6CE0000-0x00000268F6CF0000-memory.dmp

        memory/2816-98-0x00000268DE3D0000-0x00000268DE3E6000-memory.dmp

        memory/2816-96-0x00000268F6CE0000-0x00000268F6CF0000-memory.dmp

        memory/2816-95-0x00007FFDFA3A0000-0x00007FFDFAE61000-memory.dmp

        memory/2816-100-0x00000268F6CE0000-0x00000268F6CF0000-memory.dmp

        memory/2816-94-0x00000268DC700000-0x00000268DC838000-memory.dmp

        memory/2816-102-0x00007FFDFA3A0000-0x00007FFDFAE61000-memory.dmp

        memory/2816-103-0x00000268F6CE0000-0x00000268F6CF0000-memory.dmp

        memory/2816-104-0x00000268F6CE0000-0x00000268F6CF0000-memory.dmp

        memory/2816-105-0x00000268F6CE0000-0x00000268F6CF0000-memory.dmp