Analysis

  • max time kernel
    57s
  • max time network
    58s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-12-2024 21:33

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    adc809b75572fa46fda9f842728dd9fb

  • SHA1

    8bfb4918f551b2f04551504b6047539d673e30f6

  • SHA256

    4b1dfcbfe76d3b2778598bf41e3873665d0bdfae115735ca1332bed8aa50e2df

  • SHA512

    2041fa4fbd8948f05658a205d4a2a702cf6865f6982e08f37c0fd2f4d207c69199699678cf4fce18dc6fa25f41269720a00f8fbd5e0d00456b849d644246a465

  • SSDEEP

    49152:avAt62XlaSFNWPjljiFa2RoUYIEgRJ63bR3LoGd+THHB72eh2NT:avs62XlaSFNWPjljiFXRoUYIEgRJ6J

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.31.68:4782

Mutex

05ee7805-26a7-4761-b21c-d55dcaa31857

Attributes
  • encryption_key

    B444CC22137E58A588D9597C46888B34DA3BD016

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Client

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in Program Files directory 5 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 24 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 15 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 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⤵
    • Drops file in Program Files directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3944
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Client" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4348
    • C:\Program Files\SubDir\Client.exe
      "C:\Program Files\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3564
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Client" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3804
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4120
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:2340
    • 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:1224
      • 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,0x120,0xf8,0x124,0x7ff84c89cc40,0x7ff84c89cc4c,0x7ff84c89cc58
        2⤵
          PID:3168
        • 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=1804,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=1816 /prefetch:2
          2⤵
            PID:2212
          • 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=1932,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=2060 /prefetch:3
            2⤵
              PID:3732
            • 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=2272,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=2476 /prefetch:8
              2⤵
                PID:4500
              • 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=3160,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=3180 /prefetch:1
                2⤵
                  PID:312
                • 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=3200,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=3228 /prefetch:1
                  2⤵
                    PID:224
                  • 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=3724,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=4464 /prefetch:1
                    2⤵
                      PID:3104
                    • 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=4844,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=4840 /prefetch:8
                      2⤵
                        PID:3712
                      • 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=4900,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=4840 /prefetch:8
                        2⤵
                          PID:3036
                        • C:\Program Files\Google\Chrome\Application\chrome.exe
                          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=unzip.mojom.Unzipper --lang=en-US --service-sandbox-type=service --no-appcompat-clear --field-trial-handle=5024,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=4840 /prefetch:8
                          2⤵
                            PID:5024
                          • 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=5076,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=5176 /prefetch:8
                            2⤵
                              PID:4696
                            • C:\Program Files\Google\Chrome\Application\chrome.exe
                              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=unzip.mojom.Unzipper --lang=en-US --service-sandbox-type=service --no-appcompat-clear --field-trial-handle=5196,i,5362583055464121951,480424811924195892,262144 --variations-seed-version=20241006-180150.222000 --mojo-platform-channel-handle=5112 /prefetch:8
                              2⤵
                                PID:4960
                            • 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:2668
                              • C:\Windows\system32\svchost.exe
                                C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s NgcSvc
                                1⤵
                                  PID:2964

                                Network

                                MITRE ATT&CK Enterprise v15

                                Replay Monitor

                                Loading Replay Monitor...

                                Downloads

                                • C:\Program Files\SubDir\Client.exe

                                  Filesize

                                  3.1MB

                                  MD5

                                  adc809b75572fa46fda9f842728dd9fb

                                  SHA1

                                  8bfb4918f551b2f04551504b6047539d673e30f6

                                  SHA256

                                  4b1dfcbfe76d3b2778598bf41e3873665d0bdfae115735ca1332bed8aa50e2df

                                  SHA512

                                  2041fa4fbd8948f05658a205d4a2a702cf6865f6982e08f37c0fd2f4d207c69199699678cf4fce18dc6fa25f41269720a00f8fbd5e0d00456b849d644246a465

                                • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\SCT Auditing Pending Reports

                                  Filesize

                                  2B

                                  MD5

                                  d751713988987e9331980363e24189ce

                                  SHA1

                                  97d170e1550eee4afc0af065b78cda302a97674c

                                  SHA256

                                  4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945

                                  SHA512

                                  b25b294cb4deb69ea00a4c3cf3113904801b6015e5956bd019a8570b1fe1d6040e944ef3cdee16d0a46503ca6e659a25f21cf9ceddc13f352a3c98138c15d6af

                                • C:\Users\Admin\AppData\Local\Temp\scoped_dir1224_1197058954\acb55d7f-864f-4850-adcf-d20d9c28da2d.tmp

                                  Filesize

                                  150KB

                                  MD5

                                  14937b985303ecce4196154a24fc369a

                                  SHA1

                                  ecfe89e11a8d08ce0c8745ff5735d5edad683730

                                  SHA256

                                  71006a5311819fef45c659428944897184880bcdb571bf68c52b3d6ee97682ff

                                  SHA512

                                  1d03c75e4d2cd57eee7b0e93e2de293b41f280c415fb2446ac234fc5afd11fe2f2fcc8ab9843db0847c2ce6bd7df7213fcf249ea71896fbf6c0696e3f5aee46c

                                • memory/2340-22-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-23-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-21-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-24-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-25-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-26-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-15-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-16-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-17-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2340-27-0x000001DC5FE70000-0x000001DC5FE71000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/3564-14-0x00007FF849A40000-0x00007FF84A501000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/3564-13-0x000000001DA00000-0x000000001DAB2000-memory.dmp

                                  Filesize

                                  712KB

                                • memory/3564-12-0x000000001B980000-0x000000001B9D0000-memory.dmp

                                  Filesize

                                  320KB

                                • memory/3564-11-0x00007FF849A40000-0x00007FF84A501000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/3564-28-0x00007FF849A40000-0x00007FF84A501000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/3564-9-0x00007FF849A40000-0x00007FF84A501000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/3944-10-0x00007FF849A40000-0x00007FF84A501000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/3944-0-0x00007FF849A43000-0x00007FF849A45000-memory.dmp

                                  Filesize

                                  8KB

                                • memory/3944-2-0x00007FF849A40000-0x00007FF84A501000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/3944-1-0x0000000000250000-0x0000000000574000-memory.dmp

                                  Filesize

                                  3.1MB