Analysis

  • max time kernel
    50s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 15:24

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    eb8790c82d5096b84022449c2298c62a

  • SHA1

    12030a6f4988fb744328bc1963c7017207e40276

  • SHA256

    5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82

  • SHA512

    d4d7ac397e023e6c08dfd6681e802d4c52d56a45a4e66acd53bc0138d3ed45f3930ef0d90cdeaafcf478d08ecab28cae61ffe5c571fa4c37be39497f16891464

  • SSDEEP

    49152:WvIt62XlaSFNWPjljiFa2RoUYIruW+dpfYoGdizZDTHHB72eh2NT:WvE62XlaSFNWPjljiFXRoUYI6W9

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.240:4782

Mutex

fcdb4cfb-dc40-4f51-b2c7-f723b5404e35

Attributes
  • encryption_key

    1074AFFC8845D6B93DCAD37B9C170AE9CD58D08A

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windowsstartup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 34 IoCs
  • Suspicious use of SendNotifyMessage 32 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⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1704
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2560
    • 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:2496
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1264
  • C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    1⤵
      PID:2836
    • C:\Program Files\Google\Chrome\Application\chrome.exe
      "C:\Program Files\Google\Chrome\Application\chrome.exe"
      1⤵
      • Enumerates system info in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:964
      • 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=0xc0,0xc4,0xc8,0x94,0xcc,0x7fef1f49758,0x7fef1f49768,0x7fef1f49778
        2⤵
          PID:1960
        • 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=1124 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:2
          2⤵
            PID:1168
          • 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=1512 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:8
            2⤵
              PID:952
            • 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=1564 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:8
              2⤵
                PID:812
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --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=2308 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:1
                2⤵
                  PID:2716
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2316 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:1
                  2⤵
                    PID:2080
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --use-gl=angle --use-angle=swiftshader-webgl --mojo-platform-channel-handle=1388 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:2
                    2⤵
                      PID:1672
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --mojo-platform-channel-handle=3364 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:1
                      2⤵
                        PID:1728
                      • 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 --mojo-platform-channel-handle=3204 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:8
                        2⤵
                          PID:2960
                        • 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 --mojo-platform-channel-handle=3588 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:8
                          2⤵
                            PID:844
                          • 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=3940 --field-trial-handle=1308,i,7009118905232476703,3616224341990017264,131072 /prefetch:8
                            2⤵
                              PID:2552
                          • 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:1744

                            Network

                            MITRE ATT&CK Enterprise v15

                            Replay Monitor

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                            Downloads

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GPUCache\data_1

                              Filesize

                              264KB

                              MD5

                              f50f89a0a91564d0b8a211f8921aa7de

                              SHA1

                              112403a17dd69d5b9018b8cede023cb3b54eab7d

                              SHA256

                              b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                              SHA512

                              bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

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

                              Filesize

                              4KB

                              MD5

                              cf9f6ed139e499c9bbadfd3929e1f655

                              SHA1

                              549882f113639662ecafe8b454b4be6ed0e8b48d

                              SHA256

                              d7888071001eaf4c88f946eeacf61344d96353c90c58fe1536216b3c5fb51c01

                              SHA512

                              d008b1284c6ee4be294b60bc13284395b1c5c0cdfece77c0471f5c454b1211bce85be4c716fdd6334744fdb929c539b7d9f8e1b20567c9a4ff55a10e73d0dd32

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

                              Filesize

                              4KB

                              MD5

                              d874f01e5ddc0b2a6eda8412de64e8be

                              SHA1

                              355f3e887a3e56051743b804d1b0d679eb5073e3

                              SHA256

                              25cdd99a781c654cdf113dbc069cd327ae0bcd812f0cb569c9add26274f6335f

                              SHA512

                              be23487a2b91a1bab4d614b3c2c9cd02da299e4cbe23a583542a8bd6b32a7440c1775612b3aa2c2e5230134897b39b569092638332d932b3dcf2cfa3b2d962db

                            • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Site Characteristics Database\000007.dbtmp

                              Filesize

                              16B

                              MD5

                              18e723571b00fb1694a3bad6c78e4054

                              SHA1

                              afcc0ef32d46fe59e0483f9a3c891d3034d12f32

                              SHA256

                              8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa

                              SHA512

                              43bb0af7d3984012d2d67ca6b71f0201e5b948e6fe26a899641c4c6f066c59906d468ddf7f1df5ea5fa33c2bc5ea8219c0f2c82e0a5c365ad7581b898a8859e2

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

                              Filesize

                              3.1MB

                              MD5

                              eb8790c82d5096b84022449c2298c62a

                              SHA1

                              12030a6f4988fb744328bc1963c7017207e40276

                              SHA256

                              5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82

                              SHA512

                              d4d7ac397e023e6c08dfd6681e802d4c52d56a45a4e66acd53bc0138d3ed45f3930ef0d90cdeaafcf478d08ecab28cae61ffe5c571fa4c37be39497f16891464

                            • \??\pipe\crashpad_964_LFNCIOOCWSPJOLOX

                              MD5

                              d41d8cd98f00b204e9800998ecf8427e

                              SHA1

                              da39a3ee5e6b4b0d3255bfef95601890afd80709

                              SHA256

                              e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                              SHA512

                              cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                            • memory/1704-9-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/1704-0-0x0000000000830000-0x0000000000B54000-memory.dmp

                              Filesize

                              3.1MB

                            • memory/1704-2-0x000000001B360000-0x000000001B3E0000-memory.dmp

                              Filesize

                              512KB

                            • memory/1704-1-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/2496-8-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/2496-10-0x000000001B040000-0x000000001B0C0000-memory.dmp

                              Filesize

                              512KB

                            • memory/2496-7-0x0000000001330000-0x0000000001654000-memory.dmp

                              Filesize

                              3.1MB

                            • memory/2496-91-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/2496-92-0x000000001B040000-0x000000001B0C0000-memory.dmp

                              Filesize

                              512KB