Analysis

  • max time kernel
    79s
  • max time network
    84s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    07-04-2024 17:49

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    145193333e64b74823c421d26f035480

  • SHA1

    f9919b3e81793fc5ccfb48dff30606c08523361c

  • SHA256

    d57cd430c390790a495769b537242d522c25dbec4b01acf7f47b992882c37bfa

  • SHA512

    353b4e0f96f95b0ba553aaecb4b27e53c6d9fe9625547e2d614820aecd4a5103fb1b7a42d0e4eac055404c384e00ee7d046167f86f6743c374a2a9f5813aaf0a

  • SSDEEP

    49152:KvjI22SsaNYfdPBldt698dBcjH361lpoGdVnTHHB72eh2NT:Kvc22SsaNYfdPBldt6+dBcjH361/F

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

2.tcp.eu.ngrok.io:16096

Mutex

755f883f-4d58-4349-bc9e-f21c4e163b6f

Attributes
  • encryption_key

    EE65D8F2E429F4900E3A17963595716D863A2455

  • 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 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Drops file in System32 directory 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 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 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-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2176
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2960
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2612
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2600

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    145193333e64b74823c421d26f035480

    SHA1

    f9919b3e81793fc5ccfb48dff30606c08523361c

    SHA256

    d57cd430c390790a495769b537242d522c25dbec4b01acf7f47b992882c37bfa

    SHA512

    353b4e0f96f95b0ba553aaecb4b27e53c6d9fe9625547e2d614820aecd4a5103fb1b7a42d0e4eac055404c384e00ee7d046167f86f6743c374a2a9f5813aaf0a

  • memory/2176-0-0x00000000013B0000-0x00000000016D4000-memory.dmp

    Filesize

    3.1MB

  • memory/2176-1-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

    Filesize

    9.9MB

  • memory/2176-2-0x000000001B310000-0x000000001B390000-memory.dmp

    Filesize

    512KB

  • memory/2176-8-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

    Filesize

    9.9MB

  • memory/2612-7-0x0000000000870000-0x0000000000B94000-memory.dmp

    Filesize

    3.1MB

  • memory/2612-9-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

    Filesize

    9.9MB

  • memory/2612-10-0x000000001AF20000-0x000000001AFA0000-memory.dmp

    Filesize

    512KB

  • memory/2612-11-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

    Filesize

    9.9MB

  • memory/2612-12-0x000000001AF20000-0x000000001AFA0000-memory.dmp

    Filesize

    512KB