Analysis

  • max time kernel
    44s
  • max time network
    41s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241023-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    06-11-2024 07:39

General

  • Target

    Probemos.exe

  • Size

    3.1MB

  • MD5

    b4710cbc23ac3cca2e21b2d28e7c91c7

  • SHA1

    0fdfaa530d55fab75c9dbb4452ace1c1f31deda0

  • SHA256

    48d94bfa639ca4fd947e3fda203ccc16e3bb85761e11a0428f563753374de0ff

  • SHA512

    c6663f8dca6cf42364b7ba711355b714423ee52635754a5ab8f8973cf6edefb0e2fcd9ed83299dc036fa4b6514ec4233a52c887b98b1c9bbbf0c837a258f7535

  • SSDEEP

    49152:Dv+lL26AaNeWgPhlmVqvMQ7XSKWMYoybRALoGdeXTHHB72eh2NT:DvuL26AaNeWgPhlmVqkQ7XSKWXoNu

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

AdanFlores3912-54860.portmap.host:54860

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes
  • encryption_key

    AEA258EF65BF1786F0F767C0BE2497ECC304C46F

  • 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 family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in Windows directory 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
  • 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 2 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 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\Probemos.exe
    "C:\Users\Admin\AppData\Local\Temp\Probemos.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1020
    • 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:900
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1136
      • 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:1044
  • C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe"
    1⤵
    • Drops file in Windows directory
    • 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:3420
    • 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=0x224,0x228,0x22c,0x200,0x230,0x7ffaafc0cc40,0x7ffaafc0cc4c,0x7ffaafc0cc58
      2⤵
        PID:1828
      • 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=1968,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=1964 /prefetch:2
        2⤵
          PID:1140
        • 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=1564,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=2144 /prefetch:3
          2⤵
            PID:2340
          • 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=2204,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=2404 /prefetch:8
            2⤵
              PID:1532
            • 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=3128,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=3192 /prefetch:1
              2⤵
                PID:1400
              • 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=3136,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=3428 /prefetch:1
                2⤵
                  PID:2952
                • 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=3696,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=4480 /prefetch:1
                  2⤵
                    PID:4092
                  • 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=4560,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=4624 /prefetch:8
                    2⤵
                      PID:3184
                    • 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=4728,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=4820 /prefetch:8
                      2⤵
                        PID:2772
                      • 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=4904,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=4880 /prefetch:8
                        2⤵
                          PID:4240
                        • 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=4732,i,13987740824950451401,2083499328188756277,262144 --variations-seed-version=20241022-180310.361000 --mojo-platform-channel-handle=5000 /prefetch:8
                          2⤵
                            PID:4688
                        • 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:1720
                          • C:\Windows\system32\svchost.exe
                            C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s NgcSvc
                            1⤵
                              PID:4532

                            Network

                            MITRE ATT&CK Enterprise v15

                            Replay Monitor

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                            Downloads

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\BrowsingTopicsState

                              Filesize

                              649B

                              MD5

                              13d162b0f89c36f218ecd18c43a73b35

                              SHA1

                              dc90934c138787c9c02bc2bcf5b68f232a5b3da1

                              SHA256

                              bae6c3472981b03a3939e0da53d1be94eef431d0978f81967f57dbd5f1598322

                              SHA512

                              d368245d8900fbdc8edb621d0ec90e601455b31b5b18dc0c4623f30b58f41a4b037ac59d6e24b97dddebeb98a17a38c87ac0b91501650cb5dae4b7251302ff6b

                            • 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\Google\Chrome\User Data\Default\Network\TransportSecurity

                              Filesize

                              356B

                              MD5

                              5d96757d92e44216bf94f7f1035dc0c8

                              SHA1

                              0575498878f7fb61dde5a0c861d2914c4a641e6b

                              SHA256

                              65380fa8761a1e34db41aa7ea692e8cfb96e85d4393b0f230993f753fe2661ca

                              SHA512

                              b39cf73ada570023b07519106af6b7c10ca13d42eb92ee5c6b01322ddb038c84690f9d50f8895ae85910c9dfbab93257044096a724a36d8eedd80ecce9b43f3f

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                              Filesize

                              8KB

                              MD5

                              1a7520b237ed6274340ff5a08f48e7f3

                              SHA1

                              db1d808b95444524e97311ff03e51074175e5ed2

                              SHA256

                              0100b31b4089551c70a2fc06764d1001e7d1e326e62b5c2b7406a89a57d82fc8

                              SHA512

                              c4b98f4a433a783d30b7cb608b80f0f0c0e0182300299e73e8ecee10ef89d4ca9a00f715429aa4148263095e7804d08a6928f9f53e4702b7fab7ba1489f33a68

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Secure Preferences

                              Filesize

                              15KB

                              MD5

                              7f3a57f99e91379abb39842f6d8f326e

                              SHA1

                              29126a359fe5b0245990c26e4dc206e993b15f52

                              SHA256

                              199f37f9beeccaff02fb3830efd11b91c327cb72bcf9a5785ee0e6ecf60e2669

                              SHA512

                              a413d40d04860150975ff412572248b97ac131b4186164cb83703849ac8be3af2d3205e1d344fc411405df7396663a41c44f3c37c71cd53c1c8b152d129a15d1

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

                              Filesize

                              120KB

                              MD5

                              48e7dc21a9f3a074a2e1daf1efe3295b

                              SHA1

                              d2733e2a07534c534fe6118e4e5d21f084a83ba1

                              SHA256

                              1f77f3782ac63ef0839c4046c6db471366effe0deacf8cbb7a416a216e514815

                              SHA512

                              80eae3c117880edc850d6cbf4e1a9e36d35260477c9bbb1552ab6911ab3c2c2eea60542324a2f1037897ae056ede4025ba9aebe1ab9916c09ea1facecb4e29e4

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

                              Filesize

                              235KB

                              MD5

                              d3c0f3965f6bdb5dc61cfe8ca470d437

                              SHA1

                              2724ad5f52f0c172042e56d53eb37901d0964aa8

                              SHA256

                              90af1d3b9a2201158cfd44687dab333a0de3778c1114c13320cf4f6093582b33

                              SHA512

                              c2539a150ad4d8bd6bb55aafcdf2b6e9d3f1f817f0856a89f68f8438f8d6ef6094301d99472392724d79249878e16a9f45a731408eb080bfe9cec8a746b65a62

                            • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

                              Filesize

                              3.1MB

                              MD5

                              b4710cbc23ac3cca2e21b2d28e7c91c7

                              SHA1

                              0fdfaa530d55fab75c9dbb4452ace1c1f31deda0

                              SHA256

                              48d94bfa639ca4fd947e3fda203ccc16e3bb85761e11a0428f563753374de0ff

                              SHA512

                              c6663f8dca6cf42364b7ba711355b714423ee52635754a5ab8f8973cf6edefb0e2fcd9ed83299dc036fa4b6514ec4233a52c887b98b1c9bbbf0c837a258f7535

                            • \??\pipe\crashpad_3420_LUBEZXDAJXICMRJI

                              MD5

                              d41d8cd98f00b204e9800998ecf8427e

                              SHA1

                              da39a3ee5e6b4b0d3255bfef95601890afd80709

                              SHA256

                              e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                              SHA512

                              cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                            • memory/1020-0-0x00007FFAB5FD3000-0x00007FFAB5FD5000-memory.dmp

                              Filesize

                              8KB

                            • memory/1020-5-0x00007FFAB5FD0000-0x00007FFAB6A92000-memory.dmp

                              Filesize

                              10.8MB

                            • memory/1020-2-0x00007FFAB5FD0000-0x00007FFAB6A92000-memory.dmp

                              Filesize

                              10.8MB

                            • memory/1020-1-0x0000000000830000-0x0000000000B54000-memory.dmp

                              Filesize

                              3.1MB

                            • memory/1136-6-0x00007FFAB5FD0000-0x00007FFAB6A92000-memory.dmp

                              Filesize

                              10.8MB

                            • memory/1136-14-0x00007FFAB5FD0000-0x00007FFAB6A92000-memory.dmp

                              Filesize

                              10.8MB

                            • memory/1136-13-0x000000001C6F0000-0x000000001C72C000-memory.dmp

                              Filesize

                              240KB

                            • memory/1136-12-0x000000001B180000-0x000000001B192000-memory.dmp

                              Filesize

                              72KB

                            • memory/1136-9-0x000000001C770000-0x000000001C822000-memory.dmp

                              Filesize

                              712KB

                            • memory/1136-8-0x000000001B0D0000-0x000000001B120000-memory.dmp

                              Filesize

                              320KB

                            • memory/1136-7-0x00007FFAB5FD0000-0x00007FFAB6A92000-memory.dmp

                              Filesize

                              10.8MB