Analysis

  • max time kernel
    109s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240611-en
  • resource tags

    arch:x64arch:x86image:win7-20240611-enlocale:en-usos:windows7-x64system
  • submitted
    23-06-2024 14:31

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    e010924db36ba5093382221cdf0c89df

  • SHA1

    09e2ab5a296e5500001cee9481b8a066b1f400e5

  • SHA256

    a72f77cddbd993e606115287c8806adbd6b08e3217a6c6ea9a8f31fdca56c317

  • SHA512

    1c3bf5fd4a36438376416ba7c7758929403a74d37805ff283aede3586bbd2e4aa2b41bc5aa9e79523e1940bdeafcb60d15c74a88d7de82a5f21dbd507591a0f0

  • SSDEEP

    49152:3vHI22SsaNYfdPBldt698dBcjHDJSC1J6loGdsTHHB72eh2NT:3vo22SsaNYfdPBldt6+dBcjHDJSv

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.26.243:4782

Mutex

51d612b2-dcb5-4477-9ee7-748df2f891d3

Attributes
  • encryption_key

    D7CE15708C398D1F0A3B43032DE529C00B9A8B5F

  • install_name

    windowsupdater.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    msedge.exe

  • subdirectory

    Win64

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • Enumerates system info in registry 2 TTPs 3 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 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⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2164
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "msedge.exe" /sc ONLOGON /tr "C:\Windows\system32\Win64\windowsupdater.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2044
    • C:\Windows\system32\Win64\windowsupdater.exe
      "C:\Windows\system32\Win64\windowsupdater.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2620
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "msedge.exe" /sc ONLOGON /tr "C:\Windows\system32\Win64\windowsupdater.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2760
  • 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:2528
    • 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,0x7fef0029758,0x7fef0029768,0x7fef0029778
      2⤵
        PID:2544
      • 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=1140 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:2
        2⤵
          PID:1060
        • 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=1508 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:8
          2⤵
            PID:2392
          • 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=1604 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:8
            2⤵
              PID:2972
            • 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=2296 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:1
              2⤵
                PID:1488
              • 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=2304 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:1
                2⤵
                  PID:1296
                • 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=1176 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:2
                  2⤵
                    PID:2496
                  • 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=2188 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:2
                    2⤵
                      PID:1536
                    • 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=9 --mojo-platform-channel-handle=3252 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:1
                      2⤵
                        PID:2196
                      • 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=1204 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:8
                        2⤵
                          PID:1692
                        • 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=3584 --field-trial-handle=1172,i,2925016970387883880,17335261689899861797,131072 /prefetch:8
                          2⤵
                            PID:772
                        • 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:2432

                          Network

                          MITRE ATT&CK Matrix ATT&CK v13

                          Execution

                          Scheduled Task/Job

                          1
                          T1053

                          Scheduled Task

                          1
                          T1053.005

                          Persistence

                          Scheduled Task/Job

                          1
                          T1053

                          Scheduled Task

                          1
                          T1053.005

                          Privilege Escalation

                          Scheduled Task/Job

                          1
                          T1053

                          Scheduled Task

                          1
                          T1053.005

                          Discovery

                          Query Registry

                          2
                          T1012

                          System Information Discovery

                          1
                          T1082

                          Replay Monitor

                          Loading Replay Monitor...

                          Downloads

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

                            5KB

                            MD5

                            41ddcb39c7da3285f8168613d3228a9f

                            SHA1

                            99ef6c41848d03b88f6f20a21f2748f080813fc6

                            SHA256

                            9f80255a37879cd785a7e7e346f7b4a0644813a2d690f77067c66a37f968ea2f

                            SHA512

                            8511702a0323fa7a6168f93370dbf04195ad78c5a01f9b4fcf939f9d66368c59713ccadd82a365f9b0431234721435604165d1a1560f8a61b4e15329569cd0fd

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

                            5KB

                            MD5

                            4576c1ea305b1519e17339b586a5b82a

                            SHA1

                            aee92e489714ca1d8e35756f293a13b44ad0bd51

                            SHA256

                            01643441deb8c38de5c1c9b83f3668dc5eb3c70bfbc0392157250944f7b52eee

                            SHA512

                            71e72c15d86e849de48eb1ea215302abbac4597c7626fb512d03a2f3b72807b35b148d029a8d282a4a5c6fdd1ca129ac5a4537f861a4f65df5441f35c41556a6

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Sync Data\LevelDB\000007.dbtmp
                            Filesize

                            16B

                            MD5

                            18e723571b00fb1694a3bad6c78e4054

                            SHA1

                            afcc0ef32d46fe59e0483f9a3c891d3034d12f32

                            SHA256

                            8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa

                            SHA512

                            43bb0af7d3984012d2d67ca6b71f0201e5b948e6fe26a899641c4c6f066c59906d468ddf7f1df5ea5fa33c2bc5ea8219c0f2c82e0a5c365ad7581b898a8859e2

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\ShaderCache\data_1
                            Filesize

                            264KB

                            MD5

                            f50f89a0a91564d0b8a211f8921aa7de

                            SHA1

                            112403a17dd69d5b9018b8cede023cb3b54eab7d

                            SHA256

                            b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                            SHA512

                            bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

                          • C:\Windows\System32\Win64\windowsupdater.exe
                            Filesize

                            3.1MB

                            MD5

                            e010924db36ba5093382221cdf0c89df

                            SHA1

                            09e2ab5a296e5500001cee9481b8a066b1f400e5

                            SHA256

                            a72f77cddbd993e606115287c8806adbd6b08e3217a6c6ea9a8f31fdca56c317

                            SHA512

                            1c3bf5fd4a36438376416ba7c7758929403a74d37805ff283aede3586bbd2e4aa2b41bc5aa9e79523e1940bdeafcb60d15c74a88d7de82a5f21dbd507591a0f0

                          • \??\PIPE\samr
                            MD5

                            d41d8cd98f00b204e9800998ecf8427e

                            SHA1

                            da39a3ee5e6b4b0d3255bfef95601890afd80709

                            SHA256

                            e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                            SHA512

                            cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                          • memory/2164-10-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
                            Filesize

                            9.9MB

                          • memory/2164-0-0x000007FEF5703000-0x000007FEF5704000-memory.dmp
                            Filesize

                            4KB

                          • memory/2164-2-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
                            Filesize

                            9.9MB

                          • memory/2164-1-0x0000000000880000-0x0000000000BA4000-memory.dmp
                            Filesize

                            3.1MB

                          • memory/2620-11-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
                            Filesize

                            9.9MB

                          • memory/2620-12-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
                            Filesize

                            9.9MB

                          • memory/2620-13-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
                            Filesize

                            9.9MB

                          • memory/2620-9-0x0000000000F20000-0x0000000001244000-memory.dmp
                            Filesize

                            3.1MB

                          • memory/2620-8-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
                            Filesize

                            9.9MB