Resubmissions

04/12/2023, 23:29

231204-3gsz7agb7z10

22/11/2023, 01:10

231122-bjkcaaac8w10

13/06/2023, 19:34

230613-x94phabc4410

13/06/2023, 17:37

230613-v7hm5shf8310

Analysis

  • max time kernel
    139s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/11/2023, 01:10

General

  • Target
    http://51.79.49.73/crc/
  • Sample231122-bjkcaaac8w

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • 192.168.109.1:1800

Mutex
  • 551312a4-69e2-49ef-a9fc-324282122b52

Attributes
  • encryption_key

    2C8CD3E5B94023D4196F46D6FC4A100DF5B725FE

  • 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 5 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 2 IoCs
  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 56 IoCs
  • Suspicious use of SendNotifyMessage 25 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe" --disable-background-networking --disable-component-update --simulate-outdated-no-au='Tue, 31 Dec 2099 23:59:59 GMT' --single-argument http://51.79.49.73/crc/
    1⤵
    • Enumerates system info in registry
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:3736
    • 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=106.0.5249.119 --initial-client-data=0xfc,0x100,0x104,0xd8,0x108,0x7ffdf2799758,0x7ffdf2799768,0x7ffdf2799778
      2⤵
        PID:1284
      • 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=1724 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:2
        2⤵
          PID:836
        • 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=2152 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
          2⤵
            PID:1780
          • 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=utility --mojo-platform-channel-handle=2224 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
            2⤵
              PID:2372
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --enable-chrome-cart --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2800 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:1
              2⤵
                PID:3068
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --enable-chrome-cart --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=2792 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /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 --mojo-platform-channel-handle=4760 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                  2⤵
                    PID:3856
                  • 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=4880 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                    2⤵
                      PID:4488
                    • 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=4948 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                      2⤵
                        PID:3768
                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5236 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                        2⤵
                          PID:1960
                        • C:\Program Files\Google\Chrome\Application\chrome.exe
                          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilReadIcon --lang=en-US --service-sandbox-type=icon_reader --mojo-platform-channel-handle=5412 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                          2⤵
                            PID:1360
                          • C:\Program Files\Google\Chrome\Application\chrome.exe
                            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilReadIcon --lang=en-US --service-sandbox-type=icon_reader --mojo-platform-channel-handle=5396 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                            2⤵
                              PID:3352
                            • C:\Program Files\Google\Chrome\Application\chrome.exe
                              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5500 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                              2⤵
                                PID:4420
                              • C:\Program Files\Google\Chrome\Application\chrome.exe
                                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilReadIcon --lang=en-US --service-sandbox-type=icon_reader --mojo-platform-channel-handle=5380 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                                2⤵
                                  PID:1276
                                • C:\Program Files\Google\Chrome\Application\chrome.exe
                                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilReadIcon --lang=en-US --service-sandbox-type=icon_reader --mojo-platform-channel-handle=5508 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                                  2⤵
                                    PID:5072
                                  • C:\Users\Admin\Downloads\local.exe
                                    "C:\Users\Admin\Downloads\local.exe"
                                    2⤵
                                    • Executes dropped EXE
                                    • Suspicious use of AdjustPrivilegeToken
                                    • Suspicious use of FindShellTrayWindow
                                    • Suspicious use of SendNotifyMessage
                                    PID:2384
                                  • 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=5264 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                                    2⤵
                                      PID:3448
                                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5432 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:8
                                      2⤵
                                        PID:496
                                      • C:\Users\Admin\Downloads\local.exe
                                        "C:\Users\Admin\Downloads\local.exe"
                                        2⤵
                                        • Executes dropped EXE
                                        PID:1864
                                      • C:\Windows\system32\NOTEPAD.EXE
                                        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Downloads\rem.txt
                                        2⤵
                                        • Opens file in notepad (likely ransom note)
                                        PID:2852
                                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --disable-gpu-sandbox --use-gl=disabled --gpu-vendor-id=4318 --gpu-device-id=140 --gpu-sub-system-id=0 --gpu-revision=0 --gpu-driver-version=10.0.19041.546 --gpu-preferences=UAAAAAAAAADoAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAACQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1860 --field-trial-handle=1876,i,14499189861465516122,2140678412607982819,131072 /prefetch:2
                                        2⤵
                                        • Suspicious behavior: EnumeratesProcesses
                                        PID:1564
                                    • C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
                                      "C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
                                      1⤵
                                        PID:1832

                                      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 823B
                                            • SHA256 2446b7e2e6196a82b97979fdad1cb753e1980ea6377c4a7dd08a8d75a072a377
                                            • MD5 SHA1 SHA512

                                            Preferences

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                            • Size 6KB
                                            • SHA256 08f6b27b8c723fb8f6502748e11128ef8f2d011d68315c9a45a132b63747f2e8
                                            • MD5 SHA1 SHA512 SSDEEP

                                            Preferences

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                            • Size 6KB
                                            • SHA256 b48ad8c9d44d45f6902a4f64e30eba9708891e7a024bb328492827d53c35816b
                                            • MD5 SHA1 SHA512 SSDEEP

                                            Preferences

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
                                            • Size 6KB
                                            • SHA256 d0528ca6d4554197c14c7c059be9c680db334aa196afec4046a4fd6375a92b05
                                            • MD5 SHA1 SHA512 SSDEEP

                                            cf905712-3705-4426-8554-4d7542a3bfde.tmp

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\cf905712-3705-4426-8554-4d7542a3bfde.tmp
                                            • Size 6KB
                                            • SHA256 c07b6107f95192dcce7f12b8451d4669c34d61e0496c6bb88df449a108c3ee3f
                                            • MD5 SHA1 SHA512 SSDEEP

                                            Local State

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State
                                            • Size 109KB
                                            • SHA256 0eb184db5fd3e248c7c790c007818d7d67f69b1b624ededaf1c4ec67ff8bfb7d
                                            • MD5 SHA1 SHA512 SSDEEP

                                            Module Info Cache

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Module Info Cache
                                            • Size 103KB
                                            • SHA256 58e09fa94aee0729f1be27dd9eefe7d70c748a6aa2ff2583f4d39a7785e15553
                                            • MD5 SHA1 SHA512 SSDEEP

                                            Module Info Cache

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Module Info Cache
                                            • Size 110KB
                                            • SHA256 de8fabe921242e2f3db283a08ea4f76b75532e9e4ea2a295b7a1abd4eb220a77
                                            • MD5 SHA1 SHA512 SSDEEP

                                            Module Info Cache~RFe5837c4.TMP

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Module Info Cache~RFe5837c4.TMP
                                            • Size 97KB
                                            • SHA256 26ea572db6dfe2228fb4a12734e3f6eea8ae0e36c73224f13707c84169e77696
                                            • MD5 SHA1 SHA512 SSDEEP

                                            persisted_first_party_sets.json

                                            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\persisted_first_party_sets.json
                                            • Size 2B
                                            • SHA256 44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a
                                            • MD5 SHA1 SHA512

                                            local.exe

                                            • Path C:\Users\Admin\Downloads\local.exe
                                            • Size 3.1MB
                                            • SHA256 58e825e9ba90117d194b592dca90ec50ca4cd171457b9afc69e210fd6e48bfe2
                                            • MD5 SHA1 SHA512 SSDEEP

                                            local.exe

                                            • Path C:\Users\Admin\Downloads\local.exe
                                            • Size 3.1MB
                                            • SHA256 58e825e9ba90117d194b592dca90ec50ca4cd171457b9afc69e210fd6e48bfe2
                                            • MD5 SHA1 SHA512 SSDEEP

                                            local.exe

                                            • Path C:\Users\Admin\Downloads\local.exe
                                            • Size 3.1MB
                                            • SHA256 58e825e9ba90117d194b592dca90ec50ca4cd171457b9afc69e210fd6e48bfe2
                                            • MD5 SHA1 SHA512 SSDEEP

                                            local.exe

                                            • Path C:\Users\Admin\Downloads\local.exe
                                            • Size 3.1MB
                                            • SHA256 58e825e9ba90117d194b592dca90ec50ca4cd171457b9afc69e210fd6e48bfe2
                                            • MD5 SHA1 SHA512 SSDEEP

                                            rem.txt

                                            • Path C:\Users\Admin\Downloads\rem.txt
                                            • Size 430KB
                                            • SHA256 d670ba9371ef60b5110813f593c9296b05bb8be9fdd9e0e51ef52045f42ca19e
                                            • MD5 SHA1 SHA512 SSDEEP

                                            rem.txt.crdownload

                                            • Path C:\Users\Admin\Downloads\rem.txt.crdownload
                                            • Size 430KB
                                            • SHA256 d670ba9371ef60b5110813f593c9296b05bb8be9fdd9e0e51ef52045f42ca19e
                                            • MD5 SHA1 SHA512 SSDEEP

                                            memory/1864-123-0x000000001B5D0000-0x000000001B5E0000-memory.dmp

                                            memory/1864-121-0x00007FFDDEE30000-0x00007FFDDF8F1000-memory.dmp

                                            memory/1864-125-0x00007FFDDEE30000-0x00007FFDDF8F1000-memory.dmp

                                            memory/2384-87-0x0000000000ED0000-0x00000000011F4000-memory.dmp

                                            memory/2384-122-0x00007FFDDEE30000-0x00007FFDDF8F1000-memory.dmp

                                            memory/2384-88-0x00007FFDDEE30000-0x00007FFDDF8F1000-memory.dmp

                                            memory/2384-128-0x000000001BD80000-0x000000001BD90000-memory.dmp

                                            memory/2384-91-0x000000001C920000-0x000000001C9D2000-memory.dmp

                                            memory/2384-90-0x000000001C810000-0x000000001C860000-memory.dmp

                                            memory/2384-89-0x000000001BD80000-0x000000001BD90000-memory.dmp