Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/08/2024, 19:10

General

  • Target
    yolo.exe
  • Size 5.7MB
  • Sample240802-xvscxs1erc
  • SHA256 3b3fd08f825e24a763ed8abd79dcec933dfd2e3e104f21e5a2bb4a7aa3d3c244
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • 192.168.0.174:4782

Mutex
  • 1ddaef8c-bff6-41cf-ab7c-88ced4b0af76

Attributes
  • encryption_key

    D5F1E515D26F03AD6621A5237F6E935EF48F2FD8

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 6 IoCs
  • Checks BIOS information in registry 2 TTPs 12 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Executes dropped EXE 6 IoCs
  • Themida packer 17 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Adds Run key to start application 2 TTPs 4 IoCs
  • Checks whether UAC is enabled 1 TTPs 6 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs
  • Drops file in Windows directory 5 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 27 IoCs
  • Suspicious use of SendNotifyMessage 25 IoCs
  • Suspicious use of SetWindowsHookEx 12 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\yolo.exe
    "C:\Users\Admin\AppData\Local\Temp\yolo.exe"
    1⤵
    • Identifies VirtualBox via ACPI registry values (likely anti-VM)
    • Checks BIOS information in registry
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1388
    • \??\c:\users\admin\appdata\local\temp\yolo.exe 
      c:\users\admin\appdata\local\temp\yolo.exe 
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:1744
    • C:\Windows\Resources\Themes\icsys.icn.exe
      C:\Windows\Resources\Themes\icsys.icn.exe
      2⤵
      • Identifies VirtualBox via ACPI registry values (likely anti-VM)
      • Checks BIOS information in registry
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2268
      • \??\c:\windows\resources\themes\explorer.exe
        c:\windows\resources\themes\explorer.exe
        3⤵
        • Modifies visiblity of hidden/system files in Explorer
        • Identifies VirtualBox via ACPI registry values (likely anti-VM)
        • Checks BIOS information in registry
        • Executes dropped EXE
        • Adds Run key to start application
        • Checks whether UAC is enabled
        • Drops file in System32 directory
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Drops file in Windows directory
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1188
        • \??\c:\windows\resources\spoolsv.exe
          c:\windows\resources\spoolsv.exe SE
          4⤵
          • Identifies VirtualBox via ACPI registry values (likely anti-VM)
          • Checks BIOS information in registry
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2168
          • \??\c:\windows\resources\svchost.exe
            c:\windows\resources\svchost.exe
            5⤵
            • Modifies visiblity of hidden/system files in Explorer
            • Identifies VirtualBox via ACPI registry values (likely anti-VM)
            • Checks BIOS information in registry
            • Executes dropped EXE
            • Adds Run key to start application
            • Checks whether UAC is enabled
            • Drops file in System32 directory
            • Suspicious use of NtSetInformationThreadHideFromDebugger
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:2364
            • \??\c:\windows\resources\spoolsv.exe
              c:\windows\resources\spoolsv.exe PR
              6⤵
              • Identifies VirtualBox via ACPI registry values (likely anti-VM)
              • Checks BIOS information in registry
              • Executes dropped EXE
              • Checks whether UAC is enabled
              • Suspicious use of NtSetInformationThreadHideFromDebugger
              • System Location Discovery: System Language Discovery
              • Suspicious use of SetWindowsHookEx
              PID:1820
  • 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: NtCreateUserProcessBlockNonMicrosoftBinary
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:3248
    • 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:4 --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=123.0.6312.123 --initial-client-data=0x118,0x11c,0x120,0xf4,0x124,0x7ffa98aacc40,0x7ffa98aacc4c,0x7ffa98aacc58
      2⤵
        PID:4344
      • C:\Program Files\Google\Chrome\Application\chrome.exe
        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --no-appcompat-clear --gpu-preferences=WAAAAAAAAADgAAAMAAAAAAAAAAAAAAAAAABgAAEAAAA4AAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGAAAAAAAAAAYAAAAAAAAAAgAAAAAAAAACAAAAAAAAAAIAAAAAAAAAA== --field-trial-handle=1928,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=1924 /prefetch:2
        2⤵
          PID:4144
        • 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 --no-appcompat-clear --field-trial-handle=2192,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=2256 /prefetch:3
          2⤵
            PID:3604
          • 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 --no-appcompat-clear --field-trial-handle=2260,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=2456 /prefetch:8
            2⤵
              PID:3348
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --field-trial-handle=3180,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=3200 /prefetch:1
              2⤵
                PID:2284
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --field-trial-handle=3440,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=3444 /prefetch:1
                2⤵
                  PID:2548
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=7 --field-trial-handle=4072,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=4560 /prefetch:1
                  2⤵
                    PID:1804
                  • 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 --no-appcompat-clear --field-trial-handle=4820,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=4828 /prefetch:8
                    2⤵
                      PID:2504
                    • 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 --no-appcompat-clear --field-trial-handle=4860,i,6863119100921603548,2536652537248049785,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=4852 /prefetch:8
                      2⤵
                        PID:1604
                    • C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe
                      "C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe"
                      1⤵
                        PID:568
                      • C:\Windows\system32\svchost.exe
                        C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s NgcSvc
                        1⤵
                          PID:2480

                        Network

                              MITRE ATT&CK Enterprise v15

                              Replay Monitor

                              Loading Replay Monitor...

                              Downloads

                              Network Persistent State

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\Network Persistent State
                              • Size 1KB
                              • SHA256 c58075677410d03436c53bae9d7d21534e5649a7afb325869f7e802835586b88
                              • 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 356B
                              • SHA256 2f0508462cf72b6c5fa299f82ee088477964d40657253d315c5184da1172914b
                              • MD5 SHA1 SHA512

                              Preferences

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                              • Size 7KB
                              • SHA256 db3d3a2bad5eeaa79f7a0667e7c2e3d24e8f85d0c72a05fb0b5ce652e1fb3451
                              • MD5 SHA1 SHA512 SSDEEP

                              Preferences

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                              • Size 8KB
                              • SHA256 ba79ec650f0d923019941b9b575331126412d1b9e5f6d7e79b143dfaa26fcd69
                              • MD5 SHA1 SHA512 SSDEEP

                              Preferences

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                              • Size 7KB
                              • SHA256 4c304bf6176f211ab4486e7de3545013c8acd6a277a6c67ab6aeb643757530d8
                              • MD5 SHA1 SHA512 SSDEEP

                              Preferences

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                              • Size 8KB
                              • SHA256 def880417759a09d48242ed045bd2b6dd5863a80adafe5e559614bf840182a5c
                              • MD5 SHA1 SHA512 SSDEEP

                              Preferences

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                              • Size 8KB
                              • SHA256 f2be7a8c5e8a85fccd112bb1712dfac0ab795f0bf0df1df840f87b1bc7e73cd4
                              • MD5 SHA1 SHA512 SSDEEP

                              Preferences

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                              • Size 8KB
                              • SHA256 6ceae124070ce194aaeedf3d8f92fa8c698b1b584253bed9db519fc61b03e24f
                              • MD5 SHA1 SHA512 SSDEEP

                              Local State

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                              • Size 195KB
                              • SHA256 74f297391e3ff787ecc458db64701cda46794d705bf45b11bdd38b0b7c53ad9c
                              • MD5 SHA1 SHA512 SSDEEP

                              Local State

                              • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                              • Size 195KB
                              • SHA256 aad4c6390a4fddc507fbd7eaf231de32a357ded69e24739c40702c34b799256d
                              • MD5 SHA1 SHA512 SSDEEP

                              yolo.exe 

                              • Path C:\Users\Admin\AppData\Local\Temp\yolo.exe 
                              • Size 3.1MB
                              • SHA256 490d0fa62c63a60a0ff149623221126351a547933c8a2b3d61cbf9dcdff14dee
                              • MD5 SHA1 SHA512 SSDEEP

                              explorer.exe

                              • Path C:\Windows\Resources\Themes\explorer.exe
                              • Size 2.6MB
                              • SHA256 ab88476e35b80bb351530437b3059230f44e4f90c0adfee07fa090655f2d7064
                              • MD5 SHA1 SHA512 SSDEEP

                              icsys.icn.exe

                              • Path C:\Windows\Resources\Themes\icsys.icn.exe
                              • Size 2.6MB
                              • SHA256 0080690a22eb34bd46d9e6ae9acdf9edf46e1a2c77fc838b9647bd8fcc20aa84
                              • MD5 SHA1 SHA512 SSDEEP

                              spoolsv.exe

                              • Path C:\Windows\Resources\spoolsv.exe
                              • Size 2.6MB
                              • SHA256 49b371cedbb4fb19ca2b0bc4612f3d1c06572bc4c2c3486b93cb85023440ea6b
                              • MD5 SHA1 SHA512 SSDEEP

                              svchost.exe

                              • Path C:\Windows\Resources\svchost.exe
                              • Size 2.6MB
                              • SHA256 f6b9b08731f137d3beb1bad363108ce81afe51e58646c921cd1ac8a00581ea8f
                              • MD5 SHA1 SHA512 SSDEEP

                              memory/1188-100-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/1188-26-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/1188-60-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/1388-1-0x0000000077CB4000-0x0000000077CB6000-memory.dmp

                              memory/1388-0-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/1388-58-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/1744-59-0x00007FFA9F5F3000-0x00007FFA9F5F5000-memory.dmp

                              memory/1744-62-0x00007FFA9F5F0000-0x00007FFAA00B1000-memory.dmp

                              memory/1744-10-0x00007FFA9F5F3000-0x00007FFA9F5F5000-memory.dmp

                              memory/1744-11-0x0000000000C90000-0x0000000000FB4000-memory.dmp

                              memory/1744-12-0x00007FFA9F5F0000-0x00007FFAA00B1000-memory.dmp

                              memory/1744-13-0x000000001C590000-0x000000001C5E0000-memory.dmp

                              memory/1744-14-0x000000001C6A0000-0x000000001C752000-memory.dmp

                              memory/1820-53-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2168-35-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2168-56-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2268-57-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2364-44-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2364-70-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2364-66-0x0000000000400000-0x0000000000A16000-memory.dmp

                              memory/2364-61-0x0000000000400000-0x0000000000A16000-memory.dmp