Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240910-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240910-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/09/2024, 01:40

General

  • Target
    element4.exe
  • Size 3.1MB
  • Sample240918-b33b7swcrf
  • SHA256 4839b5c66226453fa0483645cc8a824964e906c560fa5b2c3804508b1e6e4aa4
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • 192.168.1.87:4782

Mutex
  • 98cb7988-a5b2-4ffc-908d-cf481d1236e4

Attributes
  • encryption_key

    48510D41BE835FBFFEDFA315D99E98B86B57AEDA

  • install_name

    Client.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
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 2 IoCs
  • Modifies registry class 1 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 4 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 26 IoCs
  • Suspicious use of SendNotifyMessage 24 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\element4.exe
    "C:\Users\Admin\AppData\Local\Temp\element4.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3400
    • 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:640
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      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
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4508
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:1304
    • 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:2800
      • 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,0x120,0xf4,0x124,0x7ff9d4cbcc40,0x7ff9d4cbcc4c,0x7ff9d4cbcc58
        2⤵
          PID:1600
        • 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=1980,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=1976 /prefetch:2
          2⤵
            PID:1632
          • 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=2108,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=2176 /prefetch:3
            2⤵
              PID:5104
            • 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=2308,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=2324 /prefetch:8
              2⤵
                PID:1616
              • 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=3188,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=3208 /prefetch:1
                2⤵
                  PID:2508
                • 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=3368,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=3352 /prefetch:1
                  2⤵
                    PID:760
                  • 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=4640,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=3740 /prefetch:1
                    2⤵
                      PID:4768
                    • 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=4860,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=4868 /prefetch:8
                      2⤵
                        PID:768
                      • 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=4980,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=4992 /prefetch:8
                        2⤵
                          PID:2292
                        • 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 --no-appcompat-clear --field-trial-handle=4408,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=5116 /prefetch:8
                          2⤵
                            PID:4892
                          • 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 --no-appcompat-clear --field-trial-handle=5064,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=5020 /prefetch:8
                            2⤵
                              PID:2920
                            • 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 --no-appcompat-clear --field-trial-handle=4820,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=4900 /prefetch:8
                              2⤵
                              • Modifies registry class
                              PID:3704
                            • 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=13 --field-trial-handle=240,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=5116 /prefetch:1
                              2⤵
                                PID:4816
                              • 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=14 --field-trial-handle=5100,i,11872754292306899762,4802276314961597003,262144 --variations-seed-version=20240909-180142.416000 --mojo-platform-channel-handle=5264 /prefetch:1
                                2⤵
                                  PID:3480
                              • 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:2164
                                • C:\Windows\system32\svchost.exe
                                  C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s NgcSvc
                                  1⤵
                                    PID:1192

                                  Network

                                        MITRE ATT&CK Enterprise v15

                                        Replay Monitor

                                        Loading Replay Monitor...

                                        Downloads

                                        BrowsingTopicsState

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\BrowsingTopicsState
                                        • Size 649B
                                        • SHA256 451672d8216d34b62b3ee80bd8fd6faeaa7fe86f1e71bddf68b5d7d1dba80e84
                                        • MD5 SHA1 SHA512

                                        Network Persistent State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\Network Persistent State
                                        • Size 1KB
                                        • SHA256 6b37d9ebb66b30fd19213353ee22c67d49b67d38693c9e817ee7d94002fb1225
                                        • 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 0546babb5ef3b1de120fd057005816614877c8b6367c854c8b30bf6a40352f43
                                        • MD5 SHA1 SHA512

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 8KB
                                        • SHA256 667a1bae0cc3640ca6895a518a57a35686b87ae9ef0c9d9dc74f5e7a228cc688
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 9KB
                                        • SHA256 9189a6b7a9fc7a349c8f6184380129028e296624dbffe39284ec0dbfed79855e
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 9KB
                                        • SHA256 71460fb8527e0484c8bf76024fbe66c72069f174a1db2e9505694cabd659fab1
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 9KB
                                        • SHA256 ac7af94e00ee56bd68e3414526d72dbedaca5824a146b7fd710f6544ad3a5bf3
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 9KB
                                        • SHA256 56fd5979423ba774a412081655db4b8607eedc83f81d134d3f72099974e467ed
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 9KB
                                        • SHA256 ef539cb6404835775e4d11faf8e4be48fd372d9a334f4eb7ca0ee2488a74ebf3
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                        • Size 9KB
                                        • SHA256 23fecf48b950cc57d028c053b57fd1e59fc346d753edc58fa214795f581ab1d4
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Secure Preferences

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Secure Preferences
                                        • Size 15KB
                                        • SHA256 9c1b37c17a170a3f9c8388bcc4580aaf94c5012ba90d724785794563b863d540
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 112KB
                                        • SHA256 bbaf96cc4108847b118eae8966325af898770d4cf0ec1b063ec1c16bc9174ee8
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 222KB
                                        • SHA256 a637b6d6f7d461344679782ce4f450f74fe7cc4786ba7e5fa0585e46bd018186
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 222KB
                                        • SHA256 b82503f4b280182fbd98e10cc2a07ba470f70a51e2bd5f177a6567994fcbcfef
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 256KB
                                        • SHA256 480cff5041942adf566b7db2a6f425d86ef3e3a09f221ea99f930f264b85524e
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Local State

                                        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                        • Size 222KB
                                        • SHA256 c23d212b95e96eb54cacfdd78d530f91409a242708f9006c96d0ec9f41d79416
                                        • MD5 SHA1 SHA512 SSDEEP

                                        Client.exe

                                        • Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
                                        • Size 3.1MB
                                        • SHA256 4839b5c66226453fa0483645cc8a824964e906c560fa5b2c3804508b1e6e4aa4
                                        • MD5 SHA1 SHA512 SSDEEP

                                        memory/1116-12-0x000000001B230000-0x000000001B280000-memory.dmp

                                        memory/1116-52-0x000000001C2A0000-0x000000001C7C8000-memory.dmp

                                        memory/1116-14-0x00007FF9DC840000-0x00007FF9DD301000-memory.dmp

                                        memory/1116-13-0x000000001B970000-0x000000001BA22000-memory.dmp

                                        memory/1116-11-0x00007FF9DC840000-0x00007FF9DD301000-memory.dmp

                                        memory/1116-9-0x00007FF9DC840000-0x00007FF9DD301000-memory.dmp

                                        memory/3400-0-0x00007FF9DC843000-0x00007FF9DC845000-memory.dmp

                                        memory/3400-10-0x00007FF9DC840000-0x00007FF9DD301000-memory.dmp

                                        memory/3400-2-0x00007FF9DC840000-0x00007FF9DD301000-memory.dmp

                                        memory/3400-1-0x0000000000CA0000-0x0000000000FC4000-memory.dmp