Analysis

  • user interaction
    yes
  • max time kernel
    60s
  • max time network
    61s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-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 5 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 5 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 5 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 5 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 28 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:4628
    • 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:2240
    • 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:812
      • 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:2400
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\7h4uThzxpMlJ.bat" "
        3⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:3932
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:4596
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:2160
          • 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:1412
            • 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:2556
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\nMFML2ZhM3lc.bat" "
              5⤵
              • Executes a command shell one-liner
              • Suspicious use of WriteProcessMemory
              PID:892
              • C:\Windows\system32\chcp.com
                chcp 65001
                6⤵
                  PID:1588
                • C:\Windows\system32\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:2696
                • 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:2596
                  • 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:2664
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\0gWoqnKaumTT.bat" "
                    7⤵
                    • Executes a command shell one-liner
                    • Suspicious use of WriteProcessMemory
                    PID:3332
                    • C:\Windows\system32\chcp.com
                      chcp 65001
                      8⤵
                        PID:4588
                      • C:\Windows\system32\PING.EXE
                        ping -n 10 localhost
                        8⤵
                        • System Network Configuration Discovery: Internet Connection Discovery
                        • Runs ping.exe
                        PID:2580
                      • 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:4608
                        • 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:408
                        • C:\Windows\system32\cmd.exe
                          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\TDq356IGKkFe.bat" "
                          9⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:4776
                          • C:\Windows\system32\chcp.com
                            chcp 65001
                            10⤵
                              PID:4684
                            • C:\Windows\system32\PING.EXE
                              ping -n 10 localhost
                              10⤵
                              • System Network Configuration Discovery: Internet Connection Discovery
                              • Runs ping.exe
                              PID:2392
                            • 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:2768
                              • 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:4832
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\C5UiuHTPemur.bat" "
                                11⤵
                                • Executes a command shell one-liner
                                • Suspicious use of WriteProcessMemory
                                PID:3896
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  12⤵
                                    PID:1784
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    12⤵
                                    • System Network Configuration Discovery: Internet Connection Discovery
                                    • Runs ping.exe
                                    PID:4412
                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                    12⤵
                                    • 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:4152
                                    • 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:5064
            • 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:2336

            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 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
                  • MD5 SHA1 SHA512 TLSH

                  0gWoqnKaumTT.bat

                  • Path C:\Users\Admin\AppData\Local\Temp\0gWoqnKaumTT.bat
                  • Size 207B
                  • SHA256 e210af51bdf1fbc832608337272379d6623d6b23909213491bc4bddd57165135
                  • MD5 SHA1 SHA512 TLSH

                  7h4uThzxpMlJ.bat

                  • Path C:\Users\Admin\AppData\Local\Temp\7h4uThzxpMlJ.bat
                  • Size 207B
                  • SHA256 6c5726580af482c582fb6db1917c498e526b94cc9bff1c778faf34a9e91da3d7
                  • MD5 SHA1 SHA512 TLSH

                  C5UiuHTPemur.bat

                  • Path C:\Users\Admin\AppData\Local\Temp\C5UiuHTPemur.bat
                  • Size 207B
                  • SHA256 ffad333ca4e714988f558e2fb31d22602de0de8aaded834f0204f09890302dcc
                  • MD5 SHA1 SHA512 TLSH

                  TDq356IGKkFe.bat

                  • Path C:\Users\Admin\AppData\Local\Temp\TDq356IGKkFe.bat
                  • Size 207B
                  • SHA256 b877e3d59eb91f08e597624f6e7a0e9e61e03b6754d024a51fcd38726c0b4cf3
                  • MD5 SHA1 SHA512 TLSH

                  nMFML2ZhM3lc.bat

                  • Path C:\Users\Admin\AppData\Local\Temp\nMFML2ZhM3lc.bat
                  • Size 207B
                  • SHA256 2d6e7f79b86be146c0f36374a7198a0f3c29ea44f792dedf7620e9f08f4cb6d1
                  • 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/812-8-0x000000001B250000-0x000000001B260000-memory.dmp

                  memory/812-11-0x000000001C630000-0x000000001C6E2000-memory.dmp

                  memory/812-10-0x000000001B1D0000-0x000000001B220000-memory.dmp

                  memory/4628-0-0x0000000000930000-0x0000000000C54000-memory.dmp

                  memory/4628-1-0x000000001B8E0000-0x000000001B8F0000-memory.dmp