Analysis

  • max time kernel
    59s
  • max time network
    61s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260911-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    11/11/2026, 06:35

General

  • Target
    ko66 final.exe
  • Size 3.1MB
  • Sample261111-hca9csfa98
  • SHA256 79f9ea4763751f7a7613fd8fd2c72a8834c8f1a7cda2984ef18c0705ba79a074
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • OK365 Client

C2
  • ko66.asia:8080

  • api.ko66.asia:8080

  • app.ko66.asia:8080

  • www.ko66.asia:8080

  • c2.ko66.asia:8080

  • malware.ko66.asia:8080

  • backdoor.ko66.asia:8080

Mutex
  • 3cb6f7ce-f521-4677-b078-01e1d892b28d

Attributes
  • encryption_key

    71514463CA895B84E7E6B4A4FC68A8243476E095

  • install_name

    Client.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    100

  • startup_key

    dkmm

  • subdirectory

    SubDir

Signatures

  • Family: Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Checks computer location settings 2 TTPs 6 IoCs

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

  • Executes dropped EXE 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 6 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • Reads the TCP/IP host and domain name from the registry 1 TTPs 12 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 6 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 6 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 29 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\ko66 final.exe
    "C:\Users\Admin\AppData\Local\Temp\ko66 final.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1800
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4684
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Reads the TCP/IP host and domain name from the registry
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1124
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2872
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\8dFPcX7lHsLG.bat" "
        3⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:4360
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:3612
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:3396
          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
            4⤵
            • Checks computer location settings
            • Executes dropped EXE
            • Reads the TCP/IP host and domain name from the registry
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:5068
            • C:\Windows\SYSTEM32\schtasks.exe
              "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
              5⤵
              • Scheduled Task/Job: Scheduled Task
              PID:876
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\gk0V03udX9ef.bat" "
              5⤵
              • Executes a command shell one-liner
              • Suspicious use of WriteProcessMemory
              PID:3224
              • C:\Windows\system32\chcp.com
                chcp 65001
                6⤵
                  PID:4516
                • C:\Windows\system32\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:4880
                • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                  6⤵
                  • Checks computer location settings
                  • Executes dropped EXE
                  • Reads the TCP/IP host and domain name from the registry
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of SetWindowsHookEx
                  • Suspicious use of WriteProcessMemory
                  PID:4576
                  • C:\Windows\SYSTEM32\schtasks.exe
                    "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                    7⤵
                    • Scheduled Task/Job: Scheduled Task
                    PID:4844
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\SYi1HKneDxG7.bat" "
                    7⤵
                    • Executes a command shell one-liner
                    • Suspicious use of WriteProcessMemory
                    PID:2800
                    • C:\Windows\system32\chcp.com
                      chcp 65001
                      8⤵
                        PID:1692
                      • C:\Windows\system32\PING.EXE
                        ping -n 10 localhost
                        8⤵
                        • System Network Configuration Discovery: Internet Connection Discovery
                        • Runs ping.exe
                        PID:816
                      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                        8⤵
                        • Checks computer location settings
                        • Executes dropped EXE
                        • Reads the TCP/IP host and domain name from the registry
                        • Suspicious use of AdjustPrivilegeToken
                        • Suspicious use of SetWindowsHookEx
                        • Suspicious use of WriteProcessMemory
                        PID:1420
                        • C:\Windows\SYSTEM32\schtasks.exe
                          "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                          9⤵
                          • Scheduled Task/Job: Scheduled Task
                          PID:4980
                        • C:\Windows\system32\cmd.exe
                          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RmACAvx5PiEp.bat" "
                          9⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:4156
                          • C:\Windows\system32\chcp.com
                            chcp 65001
                            10⤵
                              PID:4020
                            • C:\Windows\system32\PING.EXE
                              ping -n 10 localhost
                              10⤵
                              • System Network Configuration Discovery: Internet Connection Discovery
                              • Runs ping.exe
                              PID:4548
                            • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                              "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                              10⤵
                              • Checks computer location settings
                              • Executes dropped EXE
                              • Reads the TCP/IP host and domain name from the registry
                              • Suspicious use of AdjustPrivilegeToken
                              • Suspicious use of SetWindowsHookEx
                              • Suspicious use of WriteProcessMemory
                              PID:3524
                              • C:\Windows\SYSTEM32\schtasks.exe
                                "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                11⤵
                                • Scheduled Task/Job: Scheduled Task
                                PID:1324
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\dw5buMC6XJRr.bat" "
                                11⤵
                                • Executes a command shell one-liner
                                • Suspicious use of WriteProcessMemory
                                PID:2308
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  12⤵
                                    PID:4140
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    12⤵
                                    • System Network Configuration Discovery: Internet Connection Discovery
                                    • Runs ping.exe
                                    PID:1680
                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                    12⤵
                                    • Checks computer location settings
                                    • Executes dropped EXE
                                    • Reads the TCP/IP host and domain name from the registry
                                    • Suspicious use of AdjustPrivilegeToken
                                    • Suspicious use of SetWindowsHookEx
                                    • Suspicious use of WriteProcessMemory
                                    PID:3024
                                    • C:\Windows\SYSTEM32\schtasks.exe
                                      "schtasks" /create /tn "dkmm" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                      13⤵
                                      • Scheduled Task/Job: Scheduled Task
                                      PID:4420
                                    • C:\Windows\system32\cmd.exe
                                      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\8GF6xNuteHV0.bat" "
                                      13⤵
                                      • Executes a command shell one-liner
                                      PID:3692
                                      • C:\Windows\system32\chcp.com
                                        chcp 65001
                                        14⤵
                                          PID:5108
                                        • C:\Windows\system32\PING.EXE
                                          ping -n 10 localhost
                                          14⤵
                                          • System Network Configuration Discovery: Internet Connection Discovery
                                          • Runs ping.exe
                                          PID:3860
              • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                1⤵
                • Executes dropped EXE
                • Suspicious use of AdjustPrivilegeToken
                PID:3812

              Network

                    MITRE ATT&CK Enterprise v16

                    Replay Monitor

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                    Downloads

                    Client.exe.log

                    • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
                    • Size 1KB
                    • SHA256 cc9248a177495f45ec70b86c34fc5746c56730af36ace98ac7eb365dbafda674
                    • MD5 SHA1 SHA512 TLSH

                    8GF6xNuteHV0.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\8GF6xNuteHV0.bat
                    • Size 207B
                    • SHA256 725bffda9befb2117fa8bd8fcc93094e2d20afefa7362c23e26fbefaa72d8b2d
                    • MD5 SHA1 SHA512 TLSH

                    8dFPcX7lHsLG.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\8dFPcX7lHsLG.bat
                    • Size 207B
                    • SHA256 ceb689c2684b3ba7921a664e185be64b98a39d2f3785b3a674570cf663caae4f
                    • MD5 SHA1 SHA512 TLSH

                    RmACAvx5PiEp.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\RmACAvx5PiEp.bat
                    • Size 207B
                    • SHA256 b055364c1110e76cb430cf7e8e53357d5f7a4e1cdd6d27830b95884a83f1c739
                    • MD5 SHA1 SHA512 TLSH

                    SYi1HKneDxG7.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\SYi1HKneDxG7.bat
                    • Size 207B
                    • SHA256 2fcd55aaea8f4ada51994de9a33b5677da8ef1feb55cb8f1fd0cce4c82e05d03
                    • MD5 SHA1 SHA512 TLSH

                    dw5buMC6XJRr.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\dw5buMC6XJRr.bat
                    • Size 207B
                    • SHA256 ea4578c8008222b80db7bd44bdcd0ad55847a789f7e453ad409311713bfb933f
                    • MD5 SHA1 SHA512 TLSH

                    gk0V03udX9ef.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\gk0V03udX9ef.bat
                    • Size 207B
                    • SHA256 054a718da7b026cdf9945106328c3b0d997fd10ddad0a54485cab9eb425d6b69
                    • MD5 SHA1 SHA512 TLSH

                    Client.exe

                    • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                    • Size 3.1MB
                    • SHA256 79f9ea4763751f7a7613fd8fd2c72a8834c8f1a7cda2984ef18c0705ba79a074
                    • MD5 SHA1 SHA512 SSDEEP TLSH

                    memory/1124-11-0x000000001D100000-0x000000001D1B2000-memory.dmp

                    memory/1124-10-0x00000000033D0000-0x0000000003420000-memory.dmp

                    memory/1124-8-0x000000001C1F0000-0x000000001C200000-memory.dmp

                    memory/1800-0-0x0000000000790000-0x0000000000AB4000-memory.dmp

                    memory/1800-1-0x000000001B7D0000-0x000000001B7E0000-memory.dmp