Analysis

  • max time kernel
    147s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/06/2024, 16:49

General

  • Target
    4833f6e7b2beb3821ccd544a936f3d6db6403ee58c05038f15f2d1544f2acd3c.exe
  • Size 3.1MB
  • Sample240617-vb2q5szfmk
  • SHA256 4833f6e7b2beb3821ccd544a936f3d6db6403ee58c05038f15f2d1544f2acd3c
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • hvhkcutuoujbobu672-22209.portmap.host:22209

Mutex
  • 979a24d1-1ef3-4416-baf8-bf96d2280aed

Attributes
  • encryption_key

    E634ECEC5FEC379E441CB9B04C771BAC550131B0

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    service 32

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Checks computer location settings 2 TTPs 9 IoCs

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

  • Executes dropped EXE 10 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 11 IoCs

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

  • Runs ping.exe 1 TTPs 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 11 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 64 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\4833f6e7b2beb3821ccd544a936f3d6db6403ee58c05038f15f2d1544f2acd3c.exe
    "C:\Users\Admin\AppData\Local\Temp\4833f6e7b2beb3821ccd544a936f3d6db6403ee58c05038f15f2d1544f2acd3c.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3432
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4592
    • 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 SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4808
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2368
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\DJ7hBtI02Tfb.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2800
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:2076
          • C:\Windows\system32\PING.EXE
            ping -n 10 localhost
            4⤵
            • Runs ping.exe
            PID:2696
          • 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 WriteProcessMemory
            PID:4396
            • C:\Windows\SYSTEM32\schtasks.exe
              "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
              5⤵
              • Creates scheduled task(s)
              PID:1296
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\vtk5x93wg5vu.bat" "
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:876
              • C:\Windows\system32\chcp.com
                chcp 65001
                6⤵
                  PID:3928
                • C:\Windows\system32\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • Runs ping.exe
                  PID:1408
                • 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 WriteProcessMemory
                  PID:3152
                  • C:\Windows\SYSTEM32\schtasks.exe
                    "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                    7⤵
                    • Creates scheduled task(s)
                    PID:2016
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\lA7twf9p5Qth.bat" "
                    7⤵
                    • Suspicious use of WriteProcessMemory
                    PID:4688
                    • C:\Windows\system32\chcp.com
                      chcp 65001
                      8⤵
                        PID:1924
                      • C:\Windows\system32\PING.EXE
                        ping -n 10 localhost
                        8⤵
                        • Runs ping.exe
                        PID:3096
                      • 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 WriteProcessMemory
                        PID:856
                        • C:\Windows\SYSTEM32\schtasks.exe
                          "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                          9⤵
                          • Creates scheduled task(s)
                          PID:3052
                        • C:\Windows\system32\cmd.exe
                          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Aey2QCrCwriU.bat" "
                          9⤵
                          • Suspicious use of WriteProcessMemory
                          PID:1320
                          • C:\Windows\system32\chcp.com
                            chcp 65001
                            10⤵
                              PID:1872
                            • C:\Windows\system32\PING.EXE
                              ping -n 10 localhost
                              10⤵
                              • Runs ping.exe
                              PID:4532
                            • 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 WriteProcessMemory
                              PID:2444
                              • C:\Windows\SYSTEM32\schtasks.exe
                                "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                11⤵
                                • Creates scheduled task(s)
                                PID:4924
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\yNBzVCGynMrQ.bat" "
                                11⤵
                                • Suspicious use of WriteProcessMemory
                                PID:4340
                                • C:\Windows\system32\chcp.com
                                  chcp 65001
                                  12⤵
                                    PID:4640
                                  • C:\Windows\system32\PING.EXE
                                    ping -n 10 localhost
                                    12⤵
                                    • Runs ping.exe
                                    PID:2280
                                  • 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 SetWindowsHookEx
                                    • Suspicious use of WriteProcessMemory
                                    PID:2644
                                    • C:\Windows\SYSTEM32\schtasks.exe
                                      "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                      13⤵
                                      • Creates scheduled task(s)
                                      PID:1724
                                    • C:\Windows\system32\cmd.exe
                                      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\EjSbw0xwjxi4.bat" "
                                      13⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:2556
                                      • C:\Windows\system32\chcp.com
                                        chcp 65001
                                        14⤵
                                          PID:4132
                                        • C:\Windows\system32\PING.EXE
                                          ping -n 10 localhost
                                          14⤵
                                          • Runs ping.exe
                                          PID:3980
                                        • 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 SetWindowsHookEx
                                          PID:672
                                          • C:\Windows\SYSTEM32\schtasks.exe
                                            "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                            15⤵
                                            • Creates scheduled task(s)
                                            PID:2840
                                          • C:\Windows\system32\cmd.exe
                                            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\y0s73wb6u9e4.bat" "
                                            15⤵
                                              PID:4468
                                              • C:\Windows\system32\chcp.com
                                                chcp 65001
                                                16⤵
                                                  PID:4324
                                                • C:\Windows\system32\PING.EXE
                                                  ping -n 10 localhost
                                                  16⤵
                                                  • Runs ping.exe
                                                  PID:2568
                                                • 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 SetWindowsHookEx
                                                  PID:4588
                                                  • C:\Windows\SYSTEM32\schtasks.exe
                                                    "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                    17⤵
                                                    • Creates scheduled task(s)
                                                    PID:2332
                                                  • C:\Windows\system32\cmd.exe
                                                    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\oiUN5yoj3wPk.bat" "
                                                    17⤵
                                                      PID:2016
                                                      • C:\Windows\system32\chcp.com
                                                        chcp 65001
                                                        18⤵
                                                          PID:2688
                                                        • C:\Windows\system32\PING.EXE
                                                          ping -n 10 localhost
                                                          18⤵
                                                          • Runs ping.exe
                                                          PID:2028
                                                        • 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 SetWindowsHookEx
                                                          PID:3312
                                                          • C:\Windows\SYSTEM32\schtasks.exe
                                                            "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                            19⤵
                                                            • Creates scheduled task(s)
                                                            PID:4836
                                                          • C:\Windows\system32\cmd.exe
                                                            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RzqOTdakS4As.bat" "
                                                            19⤵
                                                              PID:4504
                                                              • C:\Windows\system32\chcp.com
                                                                chcp 65001
                                                                20⤵
                                                                  PID:4944
                                                                • C:\Windows\system32\PING.EXE
                                                                  ping -n 10 localhost
                                                                  20⤵
                                                                  • Runs ping.exe
                                                                  PID:4140
                                                                • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                                                  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
                                                                  20⤵
                                                                  • Executes dropped EXE
                                                                  • Suspicious use of AdjustPrivilegeToken
                                                                  • Suspicious use of SetWindowsHookEx
                                                                  PID:2576
                                                                  • C:\Windows\SYSTEM32\schtasks.exe
                                                                    "schtasks" /create /tn "service 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
                                                                    21⤵
                                                                    • Creates scheduled task(s)
                                                                    PID:3684

                          Network

                                MITRE ATT&CK Enterprise v15

                                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 da740d78ae00b72cb3710d1a1256dc6431550965d20afaa65e5d5860a4748e8c
                                • MD5 SHA1 SHA512

                                Aey2QCrCwriU.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\Aey2QCrCwriU.bat
                                • Size 207B
                                • SHA256 58f0daef023c56d0c186451cd1b7efd376622223b0c34a89c8c71a302f244525
                                • MD5 SHA1 SHA512

                                DJ7hBtI02Tfb.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\DJ7hBtI02Tfb.bat
                                • Size 207B
                                • SHA256 42efcb3cca4e45c15a718d57fc489075420a59f6fba8441a6917f061e5f20f7f
                                • MD5 SHA1 SHA512

                                EjSbw0xwjxi4.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\EjSbw0xwjxi4.bat
                                • Size 207B
                                • SHA256 74f87f38314607170b04a273fd823404a57decdf49513b3525bfa80b08444cbd
                                • MD5 SHA1 SHA512

                                RzqOTdakS4As.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\RzqOTdakS4As.bat
                                • Size 207B
                                • SHA256 5a382c51fa8279c5b47686414fe08ccf9d497c137de69d020b89d3b43034e5a2
                                • MD5 SHA1 SHA512

                                lA7twf9p5Qth.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\lA7twf9p5Qth.bat
                                • Size 207B
                                • SHA256 8c658d6db7c413c124017429002d0366ec0b2ba71062debed4ecae7ac5ca8243
                                • MD5 SHA1 SHA512

                                oiUN5yoj3wPk.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\oiUN5yoj3wPk.bat
                                • Size 207B
                                • SHA256 6a3db3c983eedf8fca656dccc618278d858eb08ef0bd719892afcc86964681ba
                                • MD5 SHA1 SHA512

                                vtk5x93wg5vu.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\vtk5x93wg5vu.bat
                                • Size 207B
                                • SHA256 f20a4e273c126b1dab7e50f4e49f04ab326160ae10c368c2988ba961570e5bdc
                                • MD5 SHA1 SHA512

                                y0s73wb6u9e4.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\y0s73wb6u9e4.bat
                                • Size 207B
                                • SHA256 3ac6627b9e3c02a71240ee2a596a727aceeb95390905360c12c23a5bc962a6ec
                                • MD5 SHA1 SHA512

                                yNBzVCGynMrQ.bat

                                • Path C:\Users\Admin\AppData\Local\Temp\yNBzVCGynMrQ.bat
                                • Size 207B
                                • SHA256 4c78a3971f131a3763f4a7da0346c327d7cf56abe72f6cc9e536d1d19577c471
                                • MD5 SHA1 SHA512

                                Client.exe

                                • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                • Size 3.1MB
                                • SHA256 4833f6e7b2beb3821ccd544a936f3d6db6403ee58c05038f15f2d1544f2acd3c
                                • MD5 SHA1 SHA512 SSDEEP

                                memory/3432-9-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

                                memory/3432-0-0x00007FFF5E983000-0x00007FFF5E985000-memory.dmp

                                memory/3432-2-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

                                memory/3432-1-0x0000000000590000-0x00000000008B4000-memory.dmp

                                memory/4808-18-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

                                memory/4808-13-0x000000001D090000-0x000000001D142000-memory.dmp

                                memory/4808-12-0x000000001CF80000-0x000000001CFD0000-memory.dmp

                                memory/4808-11-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

                                memory/4808-10-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp