Analysis

  • max time kernel
    59s
  • max time network
    61s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260911-en
  • resource tags

    arch:x64arch:x86image:win11-20260911-enlocale:en-usos:windows11-21h2-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
  • 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 31 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:1772
    • 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:4164
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • 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:1732
      • 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:2484
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\JKwbGmRUAAsn.bat" "
        3⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:3548
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:5028
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:2416
          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
            4⤵
            • 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:2772
            • 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:2368
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\HXQ446DQqUAI.bat" "
              5⤵
              • Executes a command shell one-liner
              • Suspicious use of WriteProcessMemory
              PID:5020
              • C:\Windows\system32\chcp.com
                chcp 65001
                6⤵
                  PID:2076
                • C:\Windows\system32\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:1116
                • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                  6⤵
                  • 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:4648
                  • 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:4252
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\pd00HiF6WPC9.bat" "
                    7⤵
                    • Executes a command shell one-liner
                    • Suspicious use of WriteProcessMemory
                    PID:4620
                    • C:\Windows\system32\chcp.com
                      chcp 65001
                      8⤵
                        PID:5072
                      • C:\Windows\system32\PING.EXE
                        ping -n 10 localhost
                        8⤵
                        • System Network Configuration Discovery: Internet Connection Discovery
                        • Runs ping.exe
                        PID:336
                      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                        8⤵
                        • 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:5060
                        • 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:4112
                        • C:\Windows\system32\cmd.exe
                          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ky244bAxAcym.bat" "
                          9⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:3572
                          • C:\Windows\system32\chcp.com
                            chcp 65001
                            10⤵
                              PID:492
                            • C:\Windows\system32\PING.EXE
                              ping -n 10 localhost
                              10⤵
                              • System Network Configuration Discovery: Internet Connection Discovery
                              • Runs ping.exe
                              PID:1676
                            • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                              "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                              10⤵
                              • 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:2424
                              • 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:2676
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\i7wQp57ommKo.bat" "
                                11⤵
                                • Executes a command shell one-liner
                                • Suspicious use of WriteProcessMemory
                                PID:3332
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  12⤵
                                    PID:3200
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    12⤵
                                    • System Network Configuration Discovery: Internet Connection Discovery
                                    • Runs ping.exe
                                    PID:840
                                  • 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:2380
                                    • 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:4540
                                    • C:\Windows\system32\cmd.exe
                                      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\41Jqg9aMlJxX.bat" "
                                      13⤵
                                      • Executes a command shell one-liner
                                      • Suspicious use of WriteProcessMemory
                                      PID:4296
                                      • C:\Windows\system32\chcp.com
                                        chcp 65001
                                        14⤵
                                          PID:1224
                                        • C:\Windows\system32\PING.EXE
                                          ping -n 10 localhost
                                          14⤵
                                          • System Network Configuration Discovery: Internet Connection Discovery
                                          • Runs ping.exe
                                          PID:2532
              • 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:4420

              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 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
                    • MD5 SHA1 SHA512 TLSH

                    41Jqg9aMlJxX.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\41Jqg9aMlJxX.bat
                    • Size 207B
                    • SHA256 cc983bbaefe0baeee4a8834032c386c43c3c75110229b3565e5233c8bbacce3d
                    • MD5 SHA1 SHA512 TLSH

                    HXQ446DQqUAI.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\HXQ446DQqUAI.bat
                    • Size 207B
                    • SHA256 04f69d1d08ffeda5a57d6c969388a642636e5f1e282b9eb2187c58b7e6cca823
                    • MD5 SHA1 SHA512 TLSH

                    JKwbGmRUAAsn.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\JKwbGmRUAAsn.bat
                    • Size 207B
                    • SHA256 df42a5d3e4db73e04c7cf1ffa5616db8a7fda94011757348879a55485356d337
                    • MD5 SHA1 SHA512 TLSH

                    i7wQp57ommKo.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\i7wQp57ommKo.bat
                    • Size 207B
                    • SHA256 be83088f15a2dbc454889dd367a00478eb2f9c57814ecfabc976d77cb0166e3b
                    • MD5 SHA1 SHA512 TLSH

                    ky244bAxAcym.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\ky244bAxAcym.bat
                    • Size 207B
                    • SHA256 854f8d6502185602ec63ad53383bd8cf6d6962244349dd2fc55c916470c15304
                    • MD5 SHA1 SHA512 TLSH

                    pd00HiF6WPC9.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\pd00HiF6WPC9.bat
                    • Size 207B
                    • SHA256 2b82987f709f11e6ddbbc44a8bceec61a97cfe6ad7f58838584524437ce3976b
                    • 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/1732-10-0x000000001D200000-0x000000001D250000-memory.dmp

                    memory/1732-11-0x000000001D310000-0x000000001D3C2000-memory.dmp

                    memory/1732-8-0x000000001C650000-0x000000001C660000-memory.dmp

                    memory/1772-0-0x0000000000DE0000-0x0000000001104000-memory.dmp

                    memory/1772-1-0x00000000033B0000-0x00000000033C0000-memory.dmp