Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    02/08/2026, 15:22

General

  • Target
    viet69i.exe
  • Size 3.1MB
  • Sample260802-sr2pzack4w
  • SHA256 a86e50a4d39aad3b9f5ebbe545bfcc2b05abd6bc60c272031084bc43f82b1522
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • viet69i.com:443

  • www.viet69i.com:443

  • viet69i.com:80

  • www.viet69i.com:80

Mutex
  • 780c6f19-4008-48ab-9a02-ab2de50ec339

Attributes
  • encryption_key

    ED3227F773701D05083B11A65776F95F93EEEF5E

  • 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
  • Executes dropped EXE 2 IoCs
  • Executes a command shell one-liner 1 TTPs 9 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 9 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 9 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 11 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 3 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\viet69i.exe
    "C:\Users\Admin\AppData\Local\Temp\viet69i.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1160
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4116
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4912
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1852
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\5FaLAGRTATUb.bat" "
        3⤵
        • Executes a command shell one-liner
        PID:920
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:2760
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:1320
          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
            4⤵
              PID:5780
              • C:\Windows\SYSTEM32\schtasks.exe
                "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                5⤵
                • Scheduled Task/Job: Scheduled Task
                PID:4620
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\GV5Im9FOtuGW.bat" "
                5⤵
                • Executes a command shell one-liner
                PID:2424
                • C:\Windows\system32\chcp.com
                  chcp 65001
                  6⤵
                    PID:4300
                  • C:\Windows\system32\PING.EXE
                    ping -n 10 localhost
                    6⤵
                    • System Network Configuration Discovery: Internet Connection Discovery
                    • Runs ping.exe
                    PID:4940
                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                    6⤵
                      PID:1532
                      • C:\Windows\SYSTEM32\schtasks.exe
                        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                        7⤵
                        • Scheduled Task/Job: Scheduled Task
                        PID:1948
                      • C:\Windows\system32\cmd.exe
                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\f7dkFdoHnZzs.bat" "
                        7⤵
                        • Executes a command shell one-liner
                        PID:4504
                        • C:\Windows\system32\chcp.com
                          chcp 65001
                          8⤵
                            PID:1372
                          • C:\Windows\system32\PING.EXE
                            ping -n 10 localhost
                            8⤵
                            • System Network Configuration Discovery: Internet Connection Discovery
                            • Runs ping.exe
                            PID:1884
                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                            8⤵
                              PID:5620
                              • C:\Windows\SYSTEM32\schtasks.exe
                                "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                9⤵
                                • Scheduled Task/Job: Scheduled Task
                                PID:1456
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\gVE561YG57pi.bat" "
                                9⤵
                                • Executes a command shell one-liner
                                PID:1364
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  10⤵
                                    PID:2096
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    10⤵
                                    • System Network Configuration Discovery: Internet Connection Discovery
                                    • Runs ping.exe
                                    PID:2456
                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                    10⤵
                                      PID:5980
                                      • C:\Windows\SYSTEM32\schtasks.exe
                                        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                        11⤵
                                        • Scheduled Task/Job: Scheduled Task
                                        PID:3424
                                      • C:\Windows\system32\cmd.exe
                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\vszJMV7gzz9Z.bat" "
                                        11⤵
                                        • Executes a command shell one-liner
                                        PID:2160
                                        • C:\Windows\system32\chcp.com
                                          chcp 65001
                                          12⤵
                                            PID:3780
                                          • C:\Windows\system32\PING.EXE
                                            ping -n 10 localhost
                                            12⤵
                                            • System Network Configuration Discovery: Internet Connection Discovery
                                            • Runs ping.exe
                                            PID:1912
                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                            12⤵
                                              PID:3060
                                              • C:\Windows\SYSTEM32\schtasks.exe
                                                "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                13⤵
                                                • Scheduled Task/Job: Scheduled Task
                                                PID:2772
                                              • C:\Windows\system32\cmd.exe
                                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\j1TlV1LzjcB8.bat" "
                                                13⤵
                                                • Executes a command shell one-liner
                                                PID:4308
                                                • C:\Windows\system32\chcp.com
                                                  chcp 65001
                                                  14⤵
                                                    PID:2164
                                                  • C:\Windows\system32\PING.EXE
                                                    ping -n 10 localhost
                                                    14⤵
                                                    • System Network Configuration Discovery: Internet Connection Discovery
                                                    • Runs ping.exe
                                                    PID:5096
                                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                    14⤵
                                                      PID:724
                                                      • C:\Windows\SYSTEM32\schtasks.exe
                                                        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                        15⤵
                                                        • Scheduled Task/Job: Scheduled Task
                                                        PID:5600
                                                      • C:\Windows\system32\cmd.exe
                                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\13hPq0GQDfDZ.bat" "
                                                        15⤵
                                                        • Executes a command shell one-liner
                                                        PID:4440
                                                        • C:\Windows\system32\chcp.com
                                                          chcp 65001
                                                          16⤵
                                                            PID:3016
                                                          • C:\Windows\system32\PING.EXE
                                                            ping -n 10 localhost
                                                            16⤵
                                                            • System Network Configuration Discovery: Internet Connection Discovery
                                                            • Runs ping.exe
                                                            PID:2840
                                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                            16⤵
                                                              PID:3028
                                                              • C:\Windows\SYSTEM32\schtasks.exe
                                                                "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                                17⤵
                                                                • Scheduled Task/Job: Scheduled Task
                                                                PID:864
                                                              • C:\Windows\system32\cmd.exe
                                                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\9JaePx8xuGwO.bat" "
                                                                17⤵
                                                                • Executes a command shell one-liner
                                                                PID:3940
                                                                • C:\Windows\system32\chcp.com
                                                                  chcp 65001
                                                                  18⤵
                                                                    PID:4548
                                                                  • C:\Windows\system32\PING.EXE
                                                                    ping -n 10 localhost
                                                                    18⤵
                                                                    • System Network Configuration Discovery: Internet Connection Discovery
                                                                    • Runs ping.exe
                                                                    PID:4560
                                                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                                    18⤵
                                                                      PID:4900
                                                                      • C:\Windows\SYSTEM32\schtasks.exe
                                                                        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                                        19⤵
                                                                        • Scheduled Task/Job: Scheduled Task
                                                                        PID:4652
                                                                      • C:\Windows\system32\cmd.exe
                                                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\kJwNro2yYJ9Z.bat" "
                                                                        19⤵
                                                                        • Executes a command shell one-liner
                                                                        PID:2580
                                                                        • C:\Windows\system32\chcp.com
                                                                          chcp 65001
                                                                          20⤵
                                                                            PID:2100
                                                                          • C:\Windows\system32\PING.EXE
                                                                            ping -n 10 localhost
                                                                            20⤵
                                                                            • System Network Configuration Discovery: Internet Connection Discovery
                                                                            • Runs ping.exe
                                                                            PID:5856
                                                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                                            20⤵
                                                                              PID:3476
                                                                              • C:\Windows\SYSTEM32\schtasks.exe
                                                                                "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                                                21⤵
                                                                                • Scheduled Task/Job: Scheduled Task
                                                                                PID:1980
                                      • 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:2020

                                      Network

                                            MITRE ATT&CK Enterprise v16

                                            Replay Monitor

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                                            Downloads

                                            13hPq0GQDfDZ.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\13hPq0GQDfDZ.bat
                                            • Size 207B
                                            • SHA256 a067721d8310694fb7f703121dbd8dcdf8f6fb1ad2c172abc251ab0662bf7639
                                            • MD5 SHA1 SHA512 TLSH

                                            5FaLAGRTATUb.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\5FaLAGRTATUb.bat
                                            • Size 207B
                                            • SHA256 fd11918f62e75ee3cc06583a0acc3332ecacc5bd841df6f661c7838e0f141a6c
                                            • MD5 SHA1 SHA512 TLSH

                                            9JaePx8xuGwO.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\9JaePx8xuGwO.bat
                                            • Size 207B
                                            • SHA256 0054c18bee341b798cca8ddbe83264f17516d631a29115308a66107e033528f3
                                            • MD5 SHA1 SHA512 TLSH

                                            GV5Im9FOtuGW.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\GV5Im9FOtuGW.bat
                                            • Size 207B
                                            • SHA256 21c94af9938dc5cc2ec172e164124ae9db52bd7a2bc802f396accfeb8245c467
                                            • MD5 SHA1 SHA512 TLSH

                                            f7dkFdoHnZzs.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\f7dkFdoHnZzs.bat
                                            • Size 207B
                                            • SHA256 52a0e0fc8a2f1ccc1eeeedb879c975a73d40d17bdbfee083976941bad5e99ec8
                                            • MD5 SHA1 SHA512 TLSH

                                            gVE561YG57pi.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\gVE561YG57pi.bat
                                            • Size 207B
                                            • SHA256 f226cf0a977cf79176c2a5110307f1f7b8097bb6bf11571e968a92ebb574c696
                                            • MD5 SHA1 SHA512 TLSH

                                            j1TlV1LzjcB8.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\j1TlV1LzjcB8.bat
                                            • Size 207B
                                            • SHA256 d296adaaacacc7460f8bdd52e4ad9e0d009c8f82ced966573ec86af87733c70c
                                            • MD5 SHA1 SHA512 TLSH

                                            kJwNro2yYJ9Z.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\kJwNro2yYJ9Z.bat
                                            • Size 207B
                                            • SHA256 cec79d54d94bb5728f448c09a2b857688325bceff39dce8da881d1a506863786
                                            • MD5 SHA1 SHA512 TLSH

                                            vszJMV7gzz9Z.bat

                                            • Path C:\Users\Admin\AppData\Local\Temp\vszJMV7gzz9Z.bat
                                            • Size 207B
                                            • SHA256 9d67674f5d70218e689defe76203deef9562b42599c5c8d2118a112b164a1c85
                                            • MD5 SHA1 SHA512 TLSH

                                            Client.exe

                                            • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                            • Size 3.1MB
                                            • SHA256 a86e50a4d39aad3b9f5ebbe545bfcc2b05abd6bc60c272031084bc43f82b1522
                                            • MD5 SHA1 SHA512 SSDEEP TLSH

                                            memory/1160-6-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-8-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-12-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-13-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-14-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-10-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-9-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-11-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-7-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-5-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-0-0x00007FFC45D7F000-0x00007FFC45D80000-memory.dmp

                                            memory/1160-4-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-23-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-3-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-2-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/1160-1-0x0000000000080000-0x00000000003A4000-memory.dmp

                                            memory/4912-20-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-27-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-28-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-29-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-30-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-32-0x000000001CA90000-0x000000001CAE0000-memory.dmp

                                            memory/4912-33-0x000000001CBA0000-0x000000001CC52000-memory.dmp

                                            memory/4912-26-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-40-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-25-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-24-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-22-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-21-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-19-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-18-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-17-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp

                                            memory/4912-16-0x00007FFC45BF0000-0x00007FFC46594000-memory.dmp