Analysis

  • max time kernel
    146s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-04-2024 08:15

General

  • Target

    Client.exe

  • Size

    3.1MB

  • MD5

    06c48b0057d41710e891201feb25782a

  • SHA1

    1910dedf7da045aa142c2606ee4aa55729241178

  • SHA256

    5a0c1f8c117e97ea489329daaf64834554dcabd0263480675c6277b17f70f4f4

  • SHA512

    818a46ce9fabaa244d74cffe435ea2e2740bf1e20da49402b3bb1147b994f979cf89e06ee0d3302a8c4fa33d4cfc2dc7f9eeb612125478cef4da9e4899ea9bed

  • SSDEEP

    49152:fvnI22SsaNYfdPBldt698dBcjHPCZ1JTLoGdgDfTHHB72eh2NT:fvI22SsaNYfdPBldt6+dBcjHPC5w

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.178.113:4782

Mutex

3caeec85-698d-4fb5-8dcc-d8a134c7032a

Attributes
  • encryption_key

    84878E668DB7327880C001BFC6CE91226EBE60EF

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 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\Client.exe
    "C:\Users\Admin\AppData\Local\Temp\Client.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5052
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:3496
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3032
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4764

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log

    Filesize

    1KB

    MD5

    baf55b95da4a601229647f25dad12878

    SHA1

    abc16954ebfd213733c4493fc1910164d825cac8

    SHA256

    ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

    SHA512

    24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

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

    Filesize

    3.1MB

    MD5

    06c48b0057d41710e891201feb25782a

    SHA1

    1910dedf7da045aa142c2606ee4aa55729241178

    SHA256

    5a0c1f8c117e97ea489329daaf64834554dcabd0263480675c6277b17f70f4f4

    SHA512

    818a46ce9fabaa244d74cffe435ea2e2740bf1e20da49402b3bb1147b994f979cf89e06ee0d3302a8c4fa33d4cfc2dc7f9eeb612125478cef4da9e4899ea9bed

  • memory/3032-11-0x00007FF80A380000-0x00007FF80AE41000-memory.dmp

    Filesize

    10.8MB

  • memory/3032-12-0x000000001B1C0000-0x000000001B1D0000-memory.dmp

    Filesize

    64KB

  • memory/3032-13-0x000000001BE20000-0x000000001BE70000-memory.dmp

    Filesize

    320KB

  • memory/3032-14-0x000000001BF30000-0x000000001BFE2000-memory.dmp

    Filesize

    712KB

  • memory/3032-15-0x00007FF80A380000-0x00007FF80AE41000-memory.dmp

    Filesize

    10.8MB

  • memory/3032-16-0x000000001B1C0000-0x000000001B1D0000-memory.dmp

    Filesize

    64KB

  • memory/5052-0-0x0000000000E40000-0x0000000001164000-memory.dmp

    Filesize

    3.1MB

  • memory/5052-1-0x00007FF80A380000-0x00007FF80AE41000-memory.dmp

    Filesize

    10.8MB

  • memory/5052-2-0x000000001BE70000-0x000000001BE80000-memory.dmp

    Filesize

    64KB

  • memory/5052-10-0x00007FF80A380000-0x00007FF80AE41000-memory.dmp

    Filesize

    10.8MB