Analysis

  • max time kernel
    151s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-03-2024 21:21

General

  • Target

    Gruel.exe

  • Size

    100KB

  • MD5

    b0feccddd78039aed7f1d68dae4d73d3

  • SHA1

    8fcffb3ae7af33b9b83af4c5acbb044f888eeabf

  • SHA256

    5714efd4746f7796bbc52a272f8e354f67edfb50129d5fdaa1396e920956d0d6

  • SHA512

    b02b9476eeb9c43fcfef56949f867c1c88f152d65f3961a2838b8bff02df2383945aefb9a8c517ac78d79b5a9163c7677f5b6238f4624b1966994c9c09eb428d

  • SSDEEP

    1536:ThBfyxwMz14BSSQGRwmkwmGDAzGC6TaPAlbv/g:1BKxwMz14wSQGGUDAATaPAlbv/g

Score
7/10

Malware Config

Signatures

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies system executable filetype association 2 TTPs 5 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Enumerates connected drives 3 TTPs 1 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Control Panel 2 IoCs
  • Modifies Internet Explorer settings 1 TTPs 3 IoCs
  • Modifies registry class 37 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Gruel.exe
    "C:\Users\Admin\AppData\Local\Temp\Gruel.exe"
    1⤵
    • Modifies system executable filetype association
    • Adds Run key to start application
    • Enumerates connected drives
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4912
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe shell32.dll,Control_RunDLL mmsys.cpl @1
      2⤵
        PID:3984
      • C:\Windows\SysWOW64\rundll32.exe
        rundll32.exe shell32.dll,Control_RunDLL netcpl.cpl
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4376
        • C:\Windows\system32\RunDll32.exe
          C:\Windows\system32\RunDll32.exe Shell32.dll,Control_RunDLL netcpl.cpl
          3⤵
            PID:3092
        • C:\Windows\SysWOW64\rundll32.exe
          rundll32.exe shell32.dll,Control_RunDLL mmsys.cpl,,0
          2⤵
            PID:4052
          • C:\Windows\SysWOW64\rundll32.exe
            rundll32.exe shell32.dll,Control_RunDLL main.cpl @0
            2⤵
              PID:3380
            • C:\Windows\SysWOW64\rundll32.exe
              rundll32.exe shell32.dll,Control_RunDLL modem.cpl
              2⤵
              • Checks computer location settings
              • Modifies registry class
              • Suspicious use of WriteProcessMemory
              PID:2568
              • C:\Users\Admin\AppData\Local\Temp\Gruel.exe
                "C:\Users\Admin\AppData\Local\Temp\Gruel.exe" C:\Windows\system32\rundll32.exe
                3⤵
                • Modifies registry class
                • Suspicious use of SetWindowsHookEx
                PID:1340
            • C:\Windows\SysWOW64\rundll32.exe
              rundll32.exe shell32.dll,Control_RunDLL main.cpl @1
              2⤵
                PID:2368
              • C:\Windows\SysWOW64\rundll32.exe
                rundll32.exe shell32.dll,Control_RunDLL sysdm.cpl @1
                2⤵
                • Checks computer location settings
                • Modifies registry class
                • Suspicious use of WriteProcessMemory
                PID:1372
                • C:\Users\Admin\AppData\Local\Temp\Gruel.exe
                  "C:\Users\Admin\AppData\Local\Temp\Gruel.exe" C:\Windows\System32\SystemPropertiesComputerName.exe
                  3⤵
                  • Modifies registry class
                  • Suspicious use of SetWindowsHookEx
                  PID:368
              • C:\Windows\SysWOW64\rundll32.exe
                rundll32.exe shell32.dll,Control_RunDLL appwiz.cpl,,1
                2⤵
                • Modifies registry class
                PID:4772
              • C:\Windows\SysWOW64\rundll32.exe
                rundll32.exe shell32.dll,Control_RunDLL timedate.cpl
                2⤵
                  PID:3180
                • C:\Windows\SysWOW64\rundll32.exe
                  rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,0
                  2⤵
                  • Modifies Control Panel
                  PID:1364
                • C:\Windows\SysWOW64\rundll32.exe
                  rundll32.exe shell32.dll,Control_RunDLL inetcpl.cpl,,0
                  2⤵
                    PID:4588
                • C:\Windows\explorer.exe
                  C:\Windows\explorer.exe /factory,{5BD95610-9434-43C2-886C-57852CC8A120} -Embedding
                  1⤵
                  • Modifies Internet Explorer settings
                  • Modifies registry class
                  • Suspicious behavior: AddClipboardFormatListener
                  • Suspicious use of FindShellTrayWindow
                  PID:5552
                • C:\Windows\system32\AUDIODG.EXE
                  C:\Windows\system32\AUDIODG.EXE 0x504 0x308
                  1⤵
                  • Suspicious use of AdjustPrivilegeToken
                  PID:5624
                • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1420 --field-trial-handle=2272,i,4858140932023865871,5726683989663339295,262144 --variations-seed-version /prefetch:8
                  1⤵
                    PID:5736

                  Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  • C:\Rundll32.exe

                    Filesize

                    100KB

                    MD5

                    b0feccddd78039aed7f1d68dae4d73d3

                    SHA1

                    8fcffb3ae7af33b9b83af4c5acbb044f888eeabf

                    SHA256

                    5714efd4746f7796bbc52a272f8e354f67edfb50129d5fdaa1396e920956d0d6

                    SHA512

                    b02b9476eeb9c43fcfef56949f867c1c88f152d65f3961a2838b8bff02df2383945aefb9a8c517ac78d79b5a9163c7677f5b6238f4624b1966994c9c09eb428d

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    b4c8d7be19433b9f4aeb288df6e0ea06

                    SHA1

                    e6628922a84d47ff6f8ed18ef18a004cfe6791b9

                    SHA256

                    0ed40a0dd05c1c443ec61699a44d9e6718248373aaf3a8eb9e47b922177f8955

                    SHA512

                    a10ca80513fb1a99a378c65a3ad4dc34e69948e90ef90033ed6cd0c1c8e22d2be8d75e13fbd11d331ab881d62d83f1fd8007e85a6fe838bc5ccd96329533e6a0

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    1348e4e8fc451e8021f935f4b1376c95

                    SHA1

                    c6fecb47e09a1a255cbe9a9f03d91d2100cd1737

                    SHA256

                    cdf0440a375c4d4a180a358ea3c87448482622fbc71833bc797ec1410e54bb01

                    SHA512

                    ef23469825048d1fdc7f693a9efce5a1bdb8472743917288fa06244c7172d933347d8403440598a9f4062b3514ee313462655e21bc1c1a8dde78cfb607796703

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    7fb79143306c366914491bbb65e8eabc

                    SHA1

                    2310332215257e55238ae07cf019fa8990be237f

                    SHA256

                    f0b7c4243f9018c22a71e24650d5a1693130be7c2c1a1f2f9ac37e5325c82eee

                    SHA512

                    e51c303463af7bf9e477bd7e544509052587a1abddef99fc400e8884697d4c4243ea96363978b9fc4a37474eabf9516e41282462bac2a76222464f4fe110921a

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    1904c638ead423cbe9814ce2d0e474d4

                    SHA1

                    885e8819399fdebd2673d10d2cc57ea27d98b640

                    SHA256

                    ef539db1b430291058e1ad07086484301848498956788b0923f50757c5b643bc

                    SHA512

                    d3124091b978a14b47a90892c306fde8823d4322b8fa5ed3be7bd7ef22a008b2e7de79322aa7f26047fbaa406bd09305bf9825ab4b53136cb8fe3cebeb52d2e3

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    c7a664c21d6981ded6354109242814e4

                    SHA1

                    bb0d89e31821ced06ffd2a758e98628ce9971bf7

                    SHA256

                    9a487bd0555f7ec3bc34c05a512fb734190cfbcedc7578332b346a210b3237d9

                    SHA512

                    d24f442ccc7d48163e0a8b424aecac1bb2ead46df648981f8df47bd5d4d2ba1ce51dcbd57980c8a322897f64763c7e87f36b856a59e0a72ec6476359522e4042

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    ad280b492678a8635ad65784ce8fb6ac

                    SHA1

                    2cb04e1023526e72306c064f594be74a6b5a0d7f

                    SHA256

                    212003d7f4f3030f0a9d1c0c63ea4efa3ee6441cdb1050d97caca1dccd4f9ee8

                    SHA512

                    62227f793e23078465175bba7e4592a7450fa064b857c011eb7a4513ad71bdcd121ab33ca5e1d4bccf255e65d12a27e882842697db895990b863a32ae76d12af