Analysis

  • max time kernel
    89s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    19-01-2025 04:24

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    e84825f20d531199cefcdf8f0ac0a5bf

  • SHA1

    e016a14c992c56ef916da2465211ebbfee8502c1

  • SHA256

    9c881a05c58c18e795f9f687804c8a4f13244744bbcd0b1bd07856cbd42a378d

  • SHA512

    d9b719ec9853d8c9aaeb8e597082cb69c9a338d4f5dd3685e49841dc93f03e63f67e4f21ec59fa10b561c412cbde124d589f7b1cff1525002f3b78eaf4995fab

  • SSDEEP

    49152:SvyI22SsaNYfdPBldt698dBcjHEYhBbRjPLoGdzkTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHEYh7Tj

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.2.19:4782

Mutex

112650ca-1287-418e-b9d3-1664d22cb8f1

Attributes
  • encryption_key

    CA3612A22558F9AC4A3F0665F4EF083FB1D45393

  • 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 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • 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⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2176
    • 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:3036
    • 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:2040
      • 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:2128
  • C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    1⤵
      PID:2712
    • 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:2340
      • 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,0x7fef1049758,0x7fef1049768,0x7fef1049778
        2⤵
          PID:2656
        • 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=1200 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:2
          2⤵
            PID:1936
          • 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=1552 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /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=storage.mojom.StorageService --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=1664 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:8
              2⤵
                PID:2912
              • 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=2236 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:1
                2⤵
                  PID:376
                • 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=2252 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:1
                  2⤵
                    PID:2332
                  • 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=1420 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:2
                    2⤵
                      PID:2264
                    • 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=1500 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:1
                      2⤵
                        PID:880
                      • 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=3116 --field-trial-handle=1416,i,16832627920919156721,5411874245691013749,131072 /prefetch:8
                        2⤵
                          PID:532
                      • 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:348

                        Network

                        MITRE ATT&CK Enterprise v15

                        Replay Monitor

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                        Downloads

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

                          Filesize

                          264KB

                          MD5

                          f50f89a0a91564d0b8a211f8921aa7de

                          SHA1

                          112403a17dd69d5b9018b8cede023cb3b54eab7d

                          SHA256

                          b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                          SHA512

                          bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

                        • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GCM Store\Encryption\000006.dbtmp

                          Filesize

                          16B

                          MD5

                          aefd77f47fb84fae5ea194496b44c67a

                          SHA1

                          dcfbb6a5b8d05662c4858664f81693bb7f803b82

                          SHA256

                          4166bf17b2da789b0d0cc5c74203041d98005f5d4ef88c27e8281e00148cd611

                          SHA512

                          b733d502138821948267a8b27401d7c0751e590e1298fda1428e663ccd02f55d0d2446ff4bc265bdcdc61f952d13c01524a5341bc86afc3c2cde1d8589b2e1c3

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

                          Filesize

                          5KB

                          MD5

                          058bcb65b5bd338b7885648287c74718

                          SHA1

                          651affe4d42a542092de79e9354d19a6374c2cae

                          SHA256

                          06cb3dbbcbf83247956cd19c77493cf92ef4063f81fe14bb6d03a1abb2501add

                          SHA512

                          f4c3c71d08b837d8bbc9f5ebedbeaedebebbdd54290b4686143bed079722f8bec307108d0c00f69fca04b78edbb12f4c12d661ef3ea41c6ec4ec425f18737798

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

                          Filesize

                          5KB

                          MD5

                          fa01e3a3a5df91fddf49b0e09ceefc3b

                          SHA1

                          b82ddcce2cfca3b940b24be9dde20aa8ecf09990

                          SHA256

                          fcb93e32dcc29cf13c51308fb2c2e93d151ee72a1a9dfbfa004aba9411c2b930

                          SHA512

                          9e34e2964a5559ed4d147387df1d33f44a6287bc84b9fd21fcfee9353af32b0bff793dfcdae1bfe3bd381ce4e2635b55c47629164ecdf8dca2dead0d450cb19b

                        • 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

                          e84825f20d531199cefcdf8f0ac0a5bf

                          SHA1

                          e016a14c992c56ef916da2465211ebbfee8502c1

                          SHA256

                          9c881a05c58c18e795f9f687804c8a4f13244744bbcd0b1bd07856cbd42a378d

                          SHA512

                          d9b719ec9853d8c9aaeb8e597082cb69c9a338d4f5dd3685e49841dc93f03e63f67e4f21ec59fa10b561c412cbde124d589f7b1cff1525002f3b78eaf4995fab

                        • memory/2040-11-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

                          Filesize

                          9.9MB

                        • memory/2040-12-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

                          Filesize

                          9.9MB

                        • memory/2040-9-0x0000000001230000-0x0000000001554000-memory.dmp

                          Filesize

                          3.1MB

                        • memory/2040-10-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

                          Filesize

                          9.9MB

                        • memory/2176-0-0x000007FEF5B43000-0x000007FEF5B44000-memory.dmp

                          Filesize

                          4KB

                        • memory/2176-8-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

                          Filesize

                          9.9MB

                        • memory/2176-2-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

                          Filesize

                          9.9MB

                        • memory/2176-1-0x0000000001350000-0x0000000001674000-memory.dmp

                          Filesize

                          3.1MB