Analysis

  • max time kernel
    5s
  • max time network
    148s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    13/11/2026, 11:19

General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample261113-neyqbsty4l
  • SHA256 c9a1a10f3b4a86c9779021e6d7744794b7815991f4d9e7bbc6249990d9edf75c
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • cat.coinium.org:443

  • www.cat.coinium.org:443

  • cat.coinium.org:80

  • www.cat.coinium.org:80

Mutex
  • 4f137fa5-913b-44d0-9988-f058d27cff9f

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 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
  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3556
    • 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:4252
    • 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 FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:4996
      • 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:2440
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\504VcEZkHqG3.bat" "
        3⤵
        • Executes a command shell one-liner
        PID:4328
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:1744
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:4244
          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
            4⤵
              PID:2572
              • 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:2860
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\uX6hXR3hg7Wz.bat" "
                5⤵
                • Executes a command shell one-liner
                PID:5032
                • C:\Windows\system32\chcp.com
                  chcp 65001
                  6⤵
                    PID:1856
                  • C:\Windows\system32\PING.EXE
                    ping -n 10 localhost
                    6⤵
                    • System Network Configuration Discovery: Internet Connection Discovery
                    • Runs ping.exe
                    PID:5456
                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                    6⤵
                      PID:1824
                      • 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:676
                      • C:\Windows\system32\cmd.exe
                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\jSw1PDKHb9rh.bat" "
                        7⤵
                        • Executes a command shell one-liner
                        PID:1812
                        • C:\Windows\system32\chcp.com
                          chcp 65001
                          8⤵
                            PID:832
                          • C:\Windows\system32\PING.EXE
                            ping -n 10 localhost
                            8⤵
                            • System Network Configuration Discovery: Internet Connection Discovery
                            • Runs ping.exe
                            PID:4852
                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                            8⤵
                              PID:4344
                              • 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:3452
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\bDs4INSUVar4.bat" "
                                9⤵
                                • Executes a command shell one-liner
                                PID:3884
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  10⤵
                                    PID:1508
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    10⤵
                                    • 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"
                                    10⤵
                                      PID:2864
                                      • 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:1124
                                      • C:\Windows\system32\cmd.exe
                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\gTMDUSNPlQ3a.bat" "
                                        11⤵
                                        • Executes a command shell one-liner
                                        PID:1988
                                        • C:\Windows\system32\chcp.com
                                          chcp 65001
                                          12⤵
                                            PID:2652
                                          • C:\Windows\system32\PING.EXE
                                            ping -n 10 localhost
                                            12⤵
                                            • System Network Configuration Discovery: Internet Connection Discovery
                                            • Runs ping.exe
                                            PID:5468
                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                            12⤵
                                              PID:4736
                                              • 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:4348
                                              • C:\Windows\system32\cmd.exe
                                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ecfEC4Fg43kW.bat" "
                                                13⤵
                                                • Executes a command shell one-liner
                                                PID:4116
                                                • C:\Windows\system32\chcp.com
                                                  chcp 65001
                                                  14⤵
                                                    PID:2964
                                                  • C:\Windows\system32\PING.EXE
                                                    ping -n 10 localhost
                                                    14⤵
                                                    • System Network Configuration Discovery: Internet Connection Discovery
                                                    • Runs ping.exe
                                                    PID:1736
                                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                    14⤵
                                                      PID:1136
                                                      • 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:4876
                                                      • C:\Windows\system32\cmd.exe
                                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\qXmyiwJAE0kK.bat" "
                                                        15⤵
                                                        • Executes a command shell one-liner
                                                        PID:5888
                                                        • C:\Windows\system32\chcp.com
                                                          chcp 65001
                                                          16⤵
                                                            PID:4880
                                                          • C:\Windows\system32\PING.EXE
                                                            ping -n 10 localhost
                                                            16⤵
                                                            • System Network Configuration Discovery: Internet Connection Discovery
                                                            • Runs ping.exe
                                                            PID:2336
                                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                            16⤵
                                                              PID:4192
                                                              • 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:4008
                                                              • C:\Windows\system32\cmd.exe
                                                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\OU7VftYQfmof.bat" "
                                                                17⤵
                                                                • Executes a command shell one-liner
                                                                PID:2840
                                                                • C:\Windows\system32\chcp.com
                                                                  chcp 65001
                                                                  18⤵
                                                                    PID:4952
                                                                  • C:\Windows\system32\PING.EXE
                                                                    ping -n 10 localhost
                                                                    18⤵
                                                                    • System Network Configuration Discovery: Internet Connection Discovery
                                                                    • Runs ping.exe
                                                                    PID:4712
                                                                  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                                    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                                    18⤵
                                                                      PID:5784
                                                                      • 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:408
                                                                      • C:\Windows\system32\cmd.exe
                                                                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\VmD6GanG1sTO.bat" "
                                                                        19⤵
                                                                        • Executes a command shell one-liner
                                                                        PID:5812
                                                                        • C:\Windows\system32\chcp.com
                                                                          chcp 65001
                                                                          20⤵
                                                                            PID:3520
                                                                          • C:\Windows\system32\PING.EXE
                                                                            ping -n 10 localhost
                                                                            20⤵
                                                                            • System Network Configuration Discovery: Internet Connection Discovery
                                                                            • Runs ping.exe
                                                                            PID:6048
                                                                          • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                                            "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                                            20⤵
                                                                              PID:1116
                                                                              • 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:1628
                                                                              • C:\Windows\system32\cmd.exe
                                                                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\g0vOCfJQvBYf.bat" "
                                                                                21⤵
                                                                                • Executes a command shell one-liner
                                                                                PID:3332
                                                                                • C:\Windows\system32\chcp.com
                                                                                  chcp 65001
                                                                                  22⤵
                                                                                    PID:5988
                                                                                  • C:\Windows\system32\PING.EXE
                                                                                    ping -n 10 localhost
                                                                                    22⤵
                                                                                    • System Network Configuration Discovery: Internet Connection Discovery
                                                                                    • Runs ping.exe
                                                                                    PID:5876
                                        • 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:5720

                                        Network

                                              MITRE ATT&CK Enterprise v16

                                              Replay Monitor

                                              Loading Replay Monitor...

                                              Downloads

                                              504VcEZkHqG3.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\504VcEZkHqG3.bat
                                              • Size 207B
                                              • SHA256 164be7c6ab8aeb721fa63a48fb2eeed534caab4156b7ff8253ebd6ed2ec2bd73
                                              • MD5 SHA1 SHA512 TLSH

                                              OU7VftYQfmof.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\OU7VftYQfmof.bat
                                              • Size 207B
                                              • SHA256 c11c37edd0e9e0aa2d8b9e00efbe308750f17e220fb94130b42526f8a165cc26
                                              • MD5 SHA1 SHA512 TLSH

                                              VmD6GanG1sTO.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\VmD6GanG1sTO.bat
                                              • Size 207B
                                              • SHA256 219f93a1147e4b3e0f460e0ab9bea432cbe952e071e0ad25176cf5421cb5700e
                                              • MD5 SHA1 SHA512 TLSH

                                              bDs4INSUVar4.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\bDs4INSUVar4.bat
                                              • Size 207B
                                              • SHA256 3836bfce5f47972ffcd860c56b47ddbc50550e5d2ef21bfbb2a3a659e151e5fc
                                              • MD5 SHA1 SHA512 TLSH

                                              ecfEC4Fg43kW.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\ecfEC4Fg43kW.bat
                                              • Size 207B
                                              • SHA256 539ad387bc56061dd3f6eb6ad08fe7ee4e93e1d6e1df88ab2968fbe09e48a030
                                              • MD5 SHA1 SHA512 TLSH

                                              g0vOCfJQvBYf.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\g0vOCfJQvBYf.bat
                                              • Size 207B
                                              • SHA256 a5bba3a7c2e942adaa018cb9ce085190e494ad14b51fd3477d4c0091b4a1efe1
                                              • MD5 SHA1 SHA512 TLSH

                                              gTMDUSNPlQ3a.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\gTMDUSNPlQ3a.bat
                                              • Size 207B
                                              • SHA256 37d0f1e37601920fe940a6cc56930abd597502041f166ff5baeef0d22e8c1ddd
                                              • MD5 SHA1 SHA512 TLSH

                                              jSw1PDKHb9rh.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\jSw1PDKHb9rh.bat
                                              • Size 207B
                                              • SHA256 3393bebd76fb38ccce422cdd88e033e0e67716b56ff08ff99c5038519ad32a7f
                                              • MD5 SHA1 SHA512 TLSH

                                              qXmyiwJAE0kK.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\qXmyiwJAE0kK.bat
                                              • Size 207B
                                              • SHA256 89d22bac6c079ed1dfa1e58a0280cf0f282c2010858e411519fe9a1c36036471
                                              • MD5 SHA1 SHA512 TLSH

                                              uX6hXR3hg7Wz.bat

                                              • Path C:\Users\Admin\AppData\Local\Temp\uX6hXR3hg7Wz.bat
                                              • Size 207B
                                              • SHA256 9674f3c137e5ec0c7741318c646f8bb1ac4e933cc03e9e08b40f58d10b359744
                                              • MD5 SHA1 SHA512 TLSH

                                              Client.exe

                                              • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                              • Size 3.1MB
                                              • SHA256 c9a1a10f3b4a86c9779021e6d7744794b7815991f4d9e7bbc6249990d9edf75c
                                              • MD5 SHA1 SHA512 SSDEEP TLSH

                                              memory/3556-12-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-10-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-13-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-14-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-0-0x00007FFEB13DF000-0x00007FFEB13E0000-memory.dmp

                                              memory/3556-21-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-1-0x0000000000FB0000-0x00000000012D4000-memory.dmp

                                              memory/3556-2-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-3-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-11-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-4-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-5-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-6-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-7-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-8-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/3556-9-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-23-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-29-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-33-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-34-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-36-0x000000001D580000-0x000000001D5D0000-memory.dmp

                                              memory/4996-37-0x000000001D690000-0x000000001D742000-memory.dmp

                                              memory/4996-31-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-45-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-30-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-32-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-28-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-27-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-26-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-25-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-24-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-22-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp

                                              memory/4996-20-0x00007FFEB1250000-0x00007FFEB1BF4000-memory.dmp