Analysis

  • max time kernel
    89s
  • max time network
    94s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/05/2024, 19:42

General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample240508-yemceaca6y
  • SHA256 0b61005e0c958ff41b0adced2ebf35b7a35593f1afd324b5c6e5d8d6221e2c06
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • 192.168.1.38:4782

Mutex
  • b664c8e7-d02c-4ac6-bf2d-b7ace8e02be0

Attributes
  • encryption_key

    4DEEA92004D89D0EA15995F87A9D3C8EBF339128

  • install_name

    bf7d283291cd02894s.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 52 IoCs
  • Suspicious use of SendNotifyMessage 48 IoCs
  • Suspicious use of SetWindowsHookEx 1 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4092
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\bf7d283291cd02894s.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1616
    • C:\Users\Admin\AppData\Roaming\SubDir\bf7d283291cd02894s.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\bf7d283291cd02894s.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2552
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\bf7d283291cd02894s.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3552
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4320,i,13879737908471496610,15335851594401413307,262144 --variations-seed-version --mojo-platform-channel-handle=1416 /prefetch:8
    1⤵
      PID:3340
    • C:\Program Files\Google\Chrome\Application\chrome.exe
      "C:\Program Files\Google\Chrome\Application\chrome.exe"
      1⤵
      • Enumerates system info in registry
      • Modifies data under HKEY_USERS
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:4820
      • C:\Program Files\Google\Chrome\Application\chrome.exe
        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=110.0.5481.104 --initial-client-data=0x11c,0x120,0x124,0xf8,0x128,0x7ff83d7eab58,0x7ff83d7eab68,0x7ff83d7eab78
        2⤵
          PID:4640
        • C:\Program Files\Google\Chrome\Application\chrome.exe
          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1744 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:2
          2⤵
            PID:1248
          • C:\Program Files\Google\Chrome\Application\chrome.exe
            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2160 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
            2⤵
              PID:3580
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=2220 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
              2⤵
                PID:2656
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2940 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:1
                2⤵
                  PID:992
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2948 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:1
                  2⤵
                    PID:3096
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=7 --mojo-platform-channel-handle=4364 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:1
                    2⤵
                      PID:4564
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=4316 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
                      2⤵
                        PID:5028
                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=4628 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
                        2⤵
                          PID:1772
                        • C:\Program Files\Google\Chrome\Application\chrome.exe
                          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.ProcessorMetrics --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=4844 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
                          2⤵
                            PID:2616
                          • C:\Program Files\Google\Chrome\Application\chrome.exe
                            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=4912 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
                            2⤵
                              PID:3288
                            • C:\Program Files\Google\Chrome\Application\chrome.exe
                              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=4780 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:8
                              2⤵
                                PID:828
                              • C:\Program Files\Google\Chrome\Application\chrome.exe
                                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=13 --mojo-platform-channel-handle=2632 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:1
                                2⤵
                                  PID:5084
                                • C:\Program Files\Google\Chrome\Application\chrome.exe
                                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=14 --mojo-platform-channel-handle=3640 --field-trial-handle=1824,i,14046811719877515411,956095314859010277,131072 /prefetch:1
                                  2⤵
                                    PID:3776
                                • C:\Program Files\Google\Chrome\Application\110.0.5481.104\elevation_service.exe
                                  "C:\Program Files\Google\Chrome\Application\110.0.5481.104\elevation_service.exe"
                                  1⤵
                                    PID:2184

                                  Network

                                        MITRE ATT&CK Enterprise v15

                                        Replay Monitor

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                                        Downloads

                                        the-real-index

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Code Cache\js\index-dir\the-real-index
                                        • Size 72B
                                        • SHA256 410116e832de288603f3e0415ddc37f061a83f780d3e293fef55c8173ccdd881
                                        • MD5 SHA1 SHA512

                                        SCT Auditing Pending Reports

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\SCT Auditing Pending Reports
                                        • Size 2B
                                        • SHA256 4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945
                                        • MD5 SHA1 SHA512

                                        TransportSecurity

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\TransportSecurity
                                        • Size 352B
                                        • SHA256 bee57728170ca145c2ae0e0a7b9854ca27debc9f71f12dee5598850516001313
                                        • MD5 SHA1 SHA512

                                        TransportSecurity

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\TransportSecurity
                                        • Size 352B
                                        • SHA256 c34ca5b8225579d59db7962a5c89993efe161ccc0b4b3dc1ba6b4c3251733d92
                                        • MD5 SHA1 SHA512

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 6KB
                                        • SHA256 1f372c2853d0ae3b0194f9ba011517cf0e92a6d1a88e38e59fbda1bc2dbb2f1c
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 7KB
                                        • SHA256 21eb392dd538f692f9fef5fcddb7eacbab94b3d657640f3a7ec0bfc878efc805
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 255KB
                                        • SHA256 8312c8c5d3920ac12ff975c23fcd944e7896c8ac56e4911a067e64007095c043
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 255KB
                                        • SHA256 eefa9d561d3be3ca1c991e49006e5ca499bd49b0bc1e0d40ca64b34d6765337c
                                        • MD5 SHA1 SHA512 SSDEEP

                                        bf7d283291cd02894s.exe

                                        • Path C:\Users\Admin\AppData\Roaming\SubDir\bf7d283291cd02894s.exe
                                        • Size 3.1MB
                                        • SHA256 0b61005e0c958ff41b0adced2ebf35b7a35593f1afd324b5c6e5d8d6221e2c06
                                        • MD5 SHA1 SHA512 SSDEEP

                                        memory/2552-13-0x000000001C490000-0x000000001C542000-memory.dmp

                                        memory/2552-29-0x00007FF842860000-0x00007FF843321000-memory.dmp

                                        memory/2552-39-0x000000001CDC0000-0x000000001D2E8000-memory.dmp

                                        memory/2552-12-0x0000000003270000-0x00000000032C0000-memory.dmp

                                        memory/2552-11-0x00007FF842860000-0x00007FF843321000-memory.dmp

                                        memory/2552-10-0x00007FF842860000-0x00007FF843321000-memory.dmp

                                        memory/4092-9-0x00007FF842860000-0x00007FF843321000-memory.dmp

                                        memory/4092-0-0x00007FF842863000-0x00007FF842865000-memory.dmp

                                        memory/4092-2-0x00007FF842860000-0x00007FF843321000-memory.dmp

                                        memory/4092-1-0x0000000000CD0000-0x0000000000FF4000-memory.dmp