Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260911-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    12/09/2026, 08:31

General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample260912-ke7fpasdja
  • SHA256 cddf8ed8ce548c2c1254ee53dbb92cb70bc5ddf1ab314185dc72de672818bbbc
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • ratu88hoki.com:443

  • malware.ratu88hoki.com:443

Mutex
  • 113a1acf-eae6-48f6-993c-1b6f95dce078

Attributes
  • encryption_key

    F099FC50E900CAA52299FD44FD3089CF7142A9BF

  • install_name

    Client.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Family: Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Checks computer location settings 2 TTPs 10 IoCs

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

  • Executes dropped EXE 11 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 10 IoCs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 10 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of FindShellTrayWindow 11 IoCs
  • Suspicious use of SendNotifyMessage 11 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4524
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:4600
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\INJPjphnrupQ.bat" "
        3⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:2380
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:5904
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:4740
          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
            4⤵
            • Checks computer location settings
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of FindShellTrayWindow
            • Suspicious use of SendNotifyMessage
            • Suspicious use of WriteProcessMemory
            PID:4704
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\FSLL48mE1sos.bat" "
              5⤵
              • Executes a command shell one-liner
              • Suspicious use of WriteProcessMemory
              PID:4788
              • C:\Windows\system32\chcp.com
                chcp 65001
                6⤵
                  PID:5452
                • C:\Windows\system32\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:5980
                • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                  6⤵
                  • Checks computer location settings
                  • Executes dropped EXE
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of FindShellTrayWindow
                  • Suspicious use of SendNotifyMessage
                  • Suspicious use of WriteProcessMemory
                  PID:5828
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\naTpfG8vVF0G.bat" "
                    7⤵
                    • Executes a command shell one-liner
                    • Suspicious use of WriteProcessMemory
                    PID:2836
                    • C:\Windows\system32\chcp.com
                      chcp 65001
                      8⤵
                        PID:3292
                      • C:\Windows\system32\PING.EXE
                        ping -n 10 localhost
                        8⤵
                        • System Network Configuration Discovery: Internet Connection Discovery
                        • Runs ping.exe
                        PID:1776
                      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                        8⤵
                        • Checks computer location settings
                        • Executes dropped EXE
                        • Suspicious use of AdjustPrivilegeToken
                        • Suspicious use of FindShellTrayWindow
                        • Suspicious use of SendNotifyMessage
                        • Suspicious use of WriteProcessMemory
                        PID:1932
                        • C:\Windows\system32\cmd.exe
                          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\24fVBgbEUEtO.bat" "
                          9⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:3892
                          • C:\Windows\system32\chcp.com
                            chcp 65001
                            10⤵
                              PID:1556
                            • C:\Windows\system32\PING.EXE
                              ping -n 10 localhost
                              10⤵
                              • System Network Configuration Discovery: Internet Connection Discovery
                              • Runs ping.exe
                              PID:2424
                            • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                              "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                              10⤵
                              • Checks computer location settings
                              • Executes dropped EXE
                              • Suspicious use of AdjustPrivilegeToken
                              • Suspicious use of FindShellTrayWindow
                              • Suspicious use of SendNotifyMessage
                              • Suspicious use of WriteProcessMemory
                              PID:1788
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\MSBhtmUcyGmT.bat" "
                                11⤵
                                • Executes a command shell one-liner
                                • Suspicious use of WriteProcessMemory
                                PID:4268
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  12⤵
                                    PID:2924
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    12⤵
                                    • System Network Configuration Discovery: Internet Connection Discovery
                                    • Runs ping.exe
                                    PID:1548
                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                    12⤵
                                    • Checks computer location settings
                                    • Executes dropped EXE
                                    • Suspicious use of AdjustPrivilegeToken
                                    • Suspicious use of FindShellTrayWindow
                                    • Suspicious use of SendNotifyMessage
                                    • Suspicious use of WriteProcessMemory
                                    PID:3628
                                    • C:\Windows\system32\cmd.exe
                                      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Njwo0HFibE51.bat" "
                                      13⤵
                                      • Executes a command shell one-liner
                                      • Suspicious use of WriteProcessMemory
                                      PID:3856
                                      • C:\Windows\system32\chcp.com
                                        chcp 65001
                                        14⤵
                                          PID:3984
                                        • C:\Windows\system32\PING.EXE
                                          ping -n 10 localhost
                                          14⤵
                                          • System Network Configuration Discovery: Internet Connection Discovery
                                          • Runs ping.exe
                                          PID:4008
                                        • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                          "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                          14⤵
                                          • Checks computer location settings
                                          • Executes dropped EXE
                                          • Suspicious use of AdjustPrivilegeToken
                                          • Suspicious use of FindShellTrayWindow
                                          • Suspicious use of SendNotifyMessage
                                          • Suspicious use of WriteProcessMemory
                                          PID:1320
                                          • C:\Windows\system32\cmd.exe
                                            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\pd2GBxbpQr9l.bat" "
                                            15⤵
                                            • Executes a command shell one-liner
                                            • Suspicious use of WriteProcessMemory
                                            PID:6052
                                            • C:\Windows\system32\chcp.com
                                              chcp 65001
                                              16⤵
                                                PID:6000
                                              • C:\Windows\system32\PING.EXE
                                                ping -n 10 localhost
                                                16⤵
                                                • System Network Configuration Discovery: Internet Connection Discovery
                                                • Runs ping.exe
                                                PID:636
                                              • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                16⤵
                                                • Checks computer location settings
                                                • Executes dropped EXE
                                                • Suspicious use of AdjustPrivilegeToken
                                                • Suspicious use of FindShellTrayWindow
                                                • Suspicious use of SendNotifyMessage
                                                • Suspicious use of WriteProcessMemory
                                                PID:5652
                                                • C:\Windows\system32\cmd.exe
                                                  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\k6sGzW4vf1jr.bat" "
                                                  17⤵
                                                  • Executes a command shell one-liner
                                                  • Suspicious use of WriteProcessMemory
                                                  PID:3928
                                                  • C:\Windows\system32\chcp.com
                                                    chcp 65001
                                                    18⤵
                                                      PID:2468
                                                    • C:\Windows\system32\PING.EXE
                                                      ping -n 10 localhost
                                                      18⤵
                                                      • System Network Configuration Discovery: Internet Connection Discovery
                                                      • Runs ping.exe
                                                      PID:712
                                                    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                      18⤵
                                                      • Checks computer location settings
                                                      • Executes dropped EXE
                                                      • Suspicious use of AdjustPrivilegeToken
                                                      • Suspicious use of FindShellTrayWindow
                                                      • Suspicious use of SendNotifyMessage
                                                      • Suspicious use of WriteProcessMemory
                                                      PID:4068
                                                      • C:\Windows\system32\cmd.exe
                                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\7J0EEcQ4Y5zR.bat" "
                                                        19⤵
                                                        • Executes a command shell one-liner
                                                        • Suspicious use of WriteProcessMemory
                                                        PID:5176
                                                        • C:\Windows\system32\chcp.com
                                                          chcp 65001
                                                          20⤵
                                                            PID:476
                                                          • C:\Windows\system32\PING.EXE
                                                            ping -n 10 localhost
                                                            20⤵
                                                            • System Network Configuration Discovery: Internet Connection Discovery
                                                            • Runs ping.exe
                                                            PID:5836
                                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                            20⤵
                                                            • Checks computer location settings
                                                            • Executes dropped EXE
                                                            • Suspicious use of AdjustPrivilegeToken
                                                            • Suspicious use of FindShellTrayWindow
                                                            • Suspicious use of SendNotifyMessage
                                                            • Suspicious use of WriteProcessMemory
                                                            PID:4120
                                                            • C:\Windows\system32\cmd.exe
                                                              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RpCFq6rUoGaR.bat" "
                                                              21⤵
                                                              • Executes a command shell one-liner
                                                              • Suspicious use of WriteProcessMemory
                                                              PID:5664
                                                              • C:\Windows\system32\chcp.com
                                                                chcp 65001
                                                                22⤵
                                                                  PID:2532
                                                                • C:\Windows\system32\PING.EXE
                                                                  ping -n 10 localhost
                                                                  22⤵
                                                                  • System Network Configuration Discovery: Internet Connection Discovery
                                                                  • Runs ping.exe
                                                                  PID:3320
                                                                • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                                  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                                  22⤵
                                                                  • Executes dropped EXE
                                                                  • Suspicious use of AdjustPrivilegeToken
                                                                  • Suspicious use of FindShellTrayWindow
                                                                  • Suspicious use of SendNotifyMessage
                                                                  PID:1016

                      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 2KB
                            • SHA256 c339149818fa8f9e5af4627715c3afe4f42bc1267df17d77a278d4c811ed8df1
                            • MD5 SHA1 SHA512 TLSH

                            24fVBgbEUEtO.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\24fVBgbEUEtO.bat
                            • Size 207B
                            • SHA256 abab805e2203e3907831b248d7822693cd2d35637508e137eddd33d1fdc877c5
                            • MD5 SHA1 SHA512 TLSH

                            7J0EEcQ4Y5zR.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\7J0EEcQ4Y5zR.bat
                            • Size 207B
                            • SHA256 73f386b933423cfc11c713ae252c9a14f28c7f5c247b2aa2ddd6368b587e02e9
                            • MD5 SHA1 SHA512 TLSH

                            FSLL48mE1sos.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\FSLL48mE1sos.bat
                            • Size 207B
                            • SHA256 4659aa0ba5a8cd46271d7e31bc5eebe11d928eea8a42d7dc03ec6ce12f703a91
                            • MD5 SHA1 SHA512 TLSH

                            INJPjphnrupQ.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\INJPjphnrupQ.bat
                            • Size 207B
                            • SHA256 861d9b9623dbd3a8534e8c06f5e273650b18300d4fcd8b72096ef34340ff6dd5
                            • MD5 SHA1 SHA512 TLSH

                            MSBhtmUcyGmT.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\MSBhtmUcyGmT.bat
                            • Size 207B
                            • SHA256 850b103b762274c3416e530e4a663ed5da9629eec9095e7c4d7375f6f8b9e346
                            • MD5 SHA1 SHA512 TLSH

                            Njwo0HFibE51.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\Njwo0HFibE51.bat
                            • Size 207B
                            • SHA256 29258dbf7ef8bdb00b460bde48417706707c836b933a036f1fed65a36ca0e936
                            • MD5 SHA1 SHA512 TLSH

                            RpCFq6rUoGaR.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\RpCFq6rUoGaR.bat
                            • Size 207B
                            • SHA256 379f4d0f253a007ea06d199edd35931ff19cad4d88485c89beb241a606159911
                            • MD5 SHA1 SHA512 TLSH

                            k6sGzW4vf1jr.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\k6sGzW4vf1jr.bat
                            • Size 207B
                            • SHA256 8389194240d0b2d616c5863a18aa44059ec5ec446c9090990d20076d374802b4
                            • MD5 SHA1 SHA512 TLSH

                            naTpfG8vVF0G.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\naTpfG8vVF0G.bat
                            • Size 207B
                            • SHA256 6304526e9085d6e0879491cf2664c4361abef0257f07848c20d6ff2bdca3fb21
                            • MD5 SHA1 SHA512 TLSH

                            pd2GBxbpQr9l.bat

                            • Path C:\Users\Admin\AppData\Local\Temp\pd2GBxbpQr9l.bat
                            • Size 207B
                            • SHA256 b437cd316f248fa5781342340ef1514bcf65a4206ab676846d520aa8cf06c842
                            • MD5 SHA1 SHA512 TLSH

                            Client.exe

                            • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                            • Size 3.1MB
                            • SHA256 cddf8ed8ce548c2c1254ee53dbb92cb70bc5ddf1ab314185dc72de672818bbbc
                            • MD5 SHA1 SHA512 SSDEEP TLSH

                            memory/4524-0-0x0000000000470000-0x0000000000794000-memory.dmp

                            memory/4524-1-0x0000000000F50000-0x0000000000F60000-memory.dmp

                            memory/4600-6-0x000000001D7F0000-0x000000001D8A2000-memory.dmp

                            memory/4600-5-0x000000001D6E0000-0x000000001D730000-memory.dmp

                            memory/4600-4-0x000000001B7F0000-0x000000001B800000-memory.dmp