Resubmissions

31/05/2024, 16:58

240531-vgt89aef31 8

31/05/2024, 16:54

240531-veg6xaee61 8

Analysis

  • max time kernel
    91s
  • max time network
    92s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    31/05/2024, 16:58

General

  • Target

    https://cdn.discordapp.com/attachments/1022877139856535783/1246144433896820786/MesterMC.exe?ex=665b51f1&is=665a0071&hm=a5550b2faa1b769bee849a4ffdcca64405e9461686129584b147667a050d9247&

Score
8/10

Malware Config

Signatures

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Modifies file permissions 1 TTPs 1 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
  • NTFS ADS 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 7 IoCs
  • Suspicious use of FindShellTrayWindow 36 IoCs
  • Suspicious use of SendNotifyMessage 12 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --single-argument https://cdn.discordapp.com/attachments/1022877139856535783/1246144433896820786/MesterMC.exe?ex=665b51f1&is=665a0071&hm=a5550b2faa1b769bee849a4ffdcca64405e9461686129584b147667a050d9247&
    1⤵
    • Enumerates system info in registry
    • NTFS ADS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:2372
    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=90.0.4430.212 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --annotation=plat=Win64 "--annotation=prod=Microsoft Edge" --annotation=ver=90.0.818.66 --initial-client-data=0x100,0x104,0x108,0xdc,0x10c,0x7ffb954f3cb8,0x7ffb954f3cc8,0x7ffb954f3cd8
      2⤵
        PID:4456
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --gpu-preferences=SAAAAAAAAADgAAAwAAAAAAAAAAAAAAAAAABgAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB4AAAAAAAAAHgAAAAAAAAAKAAAAAQAAAAgAAAAAAAAACgAAAAAAAAAMAAAAAAAAAA4AAAAAAAAABAAAAAAAAAAAAAAAAUAAAAQAAAAAAAAAAAAAAAGAAAAEAAAAAAAAAABAAAABQAAABAAAAAAAAAAAQAAAAYAAAAIAAAAAAAAAAgAAAAAAAAA --mojo-platform-channel-handle=1940 /prefetch:2
        2⤵
          PID:3408
        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2336 /prefetch:3
          2⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:3380
        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2628 /prefetch:8
          2⤵
            PID:3112
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3240 /prefetch:1
            2⤵
              PID:1192
            • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
              "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3372 /prefetch:1
              2⤵
                PID:2052
              • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=4660 /prefetch:1
                2⤵
                  PID:2152
                • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=chrome.mojom.UtilReadIcon --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --service-sandbox-type=icon_reader --mojo-platform-channel-handle=5424 /prefetch:8
                  2⤵
                    PID:1788
                  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5108 /prefetch:8
                    2⤵
                    • Suspicious behavior: EnumeratesProcesses
                    PID:2796
                  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=11 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=4976 /prefetch:1
                    2⤵
                      PID:3052
                    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --instant-process --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=12 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5984 /prefetch:1
                      2⤵
                        PID:5112
                      • C:\Program Files (x86)\Microsoft\Edge\Application\90.0.818.66\identity_helper.exe
                        "C:\Program Files (x86)\Microsoft\Edge\Application\90.0.818.66\identity_helper.exe" --type=utility --utility-sub-type=winrt_app_id.mojom.WinrtAppIdService --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5604 /prefetch:8
                        2⤵
                        • Suspicious behavior: EnumeratesProcesses
                        PID:240
                      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=14 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5940 /prefetch:1
                        2⤵
                          PID:1236
                        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --disable-client-side-phishing-detection --instant-process --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=15 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=5728 /prefetch:1
                          2⤵
                            PID:1524
                          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --field-trial-handle=1420,8541351632868524199,16967875430549717499,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=5140 /prefetch:8
                            2⤵
                            • NTFS ADS
                            • Suspicious behavior: EnumeratesProcesses
                            PID:2496
                        • C:\Windows\System32\CompPkgSrv.exe
                          C:\Windows\System32\CompPkgSrv.exe -Embedding
                          1⤵
                            PID:4056
                          • C:\Windows\System32\CompPkgSrv.exe
                            C:\Windows\System32\CompPkgSrv.exe -Embedding
                            1⤵
                              PID:4768
                            • C:\Windows\System32\rundll32.exe
                              C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
                              1⤵
                                PID:2152
                              • C:\Users\Admin\Downloads\MesterMC.exe
                                "C:\Users\Admin\Downloads\MesterMC.exe"
                                1⤵
                                • Executes dropped EXE
                                PID:4624
                                • C:\Windows\SysWOW64\cmd.exe
                                  C:\Windows\system32\cmd.exe /c java -version 2>java-version.txt
                                  2⤵
                                    PID:5024
                                    • C:\Program Files (x86)\Common Files\Oracle\Java\javapath\java.exe
                                      java -version
                                      3⤵
                                        PID:3540
                                        • C:\Windows\system32\icacls.exe
                                          C:\Windows\system32\icacls.exe C:\ProgramData\Oracle\Java\.oracle_jre_usage /grant "everyone":(OI)(CI)M
                                          4⤵
                                          • Modifies file permissions
                                          PID:460

                                  Network

                                  MITRE ATT&CK Enterprise v15

                                  Replay Monitor

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                                  Downloads

                                  • C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp

                                    Filesize

                                    46B

                                    MD5

                                    a192bb05d69fe059cd1d8c80c43ac5a6

                                    SHA1

                                    8e97dbcd3574e83cc1d65b6e67c779651be0e00d

                                    SHA256

                                    2750d293dd899652b32d5eb28e0c093ea55ccb02b401e1964724bbe3494a8db2

                                    SHA512

                                    1c1e388abf1e00e1199b9e1254f6b2bad1948d258653869034548d61c06172c8c5b318330036b233122ee8be4f742bba1f3d1edac8d01c9911700bf5ebb8fa46

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat

                                    Filesize

                                    152B

                                    MD5

                                    de47c3995ae35661b0c60c1f1d30f0ab

                                    SHA1

                                    6634569b803dc681dc068de3a3794053fa68c0ca

                                    SHA256

                                    4d063bb78bd4fa86cee3d393dd31a08cab05e3539d31ca9f0a294df754cd00c7

                                    SHA512

                                    852a9580564fd4c53a9982ddf36a5679dbdce55d445b979001b4d97d60a9a688e532821403322c88acc42f6b7fa9cc5e964a79cbe142a96cbe0f5612fe1d61cb

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat

                                    Filesize

                                    152B

                                    MD5

                                    704d4cabea796e63d81497ab24b05379

                                    SHA1

                                    b4d01216a6985559bd4b6d193ed1ec0f93b15ff8

                                    SHA256

                                    3db2f8ac0fb3889fcf383209199e35ac8380cf1b78714fc5900df247ba324d26

                                    SHA512

                                    0f4803b7b7396a29d43d40f971701fd1af12d82f559dcfd25e0ca9cc8868a182acba7b28987142c1f003efd7dd22e474ac4c8f01fe73725b3618a7bf3e77801d

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network Persistent State

                                    Filesize

                                    186B

                                    MD5

                                    094ab275342c45551894b7940ae9ad0d

                                    SHA1

                                    2e7ce26fe2eb9be641ae929d0c9cc0dfa26c018e

                                    SHA256

                                    ef1739b833a1048ee1bd55dcbac5b1397396faca1ad771f4d6c2fe58899495a3

                                    SHA512

                                    19d0c688dc1121569247111e45de732b2ab86c71aecdde34b157cfd1b25c53473ed3ade49a97f8cb2ddc4711be78fa26c9330887094e031e9a71bb5c29080b0d

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

                                    Filesize

                                    5KB

                                    MD5

                                    40db7629ddedd226d3fab1b0ecbcde19

                                    SHA1

                                    877b387670ee0bad06bb450e336d8cac95baf762

                                    SHA256

                                    50be5ec807c1954fa28e6eaeceda7df17d275cb94043d21e94aa65e5f8e7ef17

                                    SHA512

                                    d2bcb051fca0f9f811a585dcfcb583296be4aeea71a3a6b1fcb5bcaccf89a21b1b88d45aad67038d9f6b743a65341c0b784bd7f5e4c4b8d4c4fcf93a603ea38d

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

                                    Filesize

                                    5KB

                                    MD5

                                    894bd938ff45bdf4eebb322fef97ec5b

                                    SHA1

                                    b3e2a0257986b4baa712ef10d7003c059f0a9ea5

                                    SHA256

                                    bed7db9e53424b4795eb534075810dd7c0f4e585d3b8f5609568d78480c2d3cd

                                    SHA512

                                    199df9dcfc80dc7e6f9444adaaa4f989540263a100d06891512e5513839c09ad52c59cc90cabe0be1428a74bfc3824b8931e3ad7899ea5b93b241c2576ff6983

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

                                    Filesize

                                    5KB

                                    MD5

                                    a74b1bd5f35326955e7e39dbfcfbdbbd

                                    SHA1

                                    d29b512c9ce5c871cc35f0c92b681575899bbebc

                                    SHA256

                                    c95d69b45d6fe2931ecd5fca6b4cff6824b730bb6ea81cb55bc9b5a9d815fb80

                                    SHA512

                                    44271f8df9255cbf722eefc6ef7e06990ffb3b5ae28f58b57058a4a2c147b43794fe4057a62440dc1b1e274ab2a4e638c1d111a7a4d09a838d1a43c631732265

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\data_reduction_proxy_leveldb\CURRENT

                                    Filesize

                                    16B

                                    MD5

                                    46295cac801e5d4857d09837238a6394

                                    SHA1

                                    44e0fa1b517dbf802b18faf0785eeea6ac51594b

                                    SHA256

                                    0f1bad70c7bd1e0a69562853ec529355462fcd0423263a3d39d6d0d70b780443

                                    SHA512

                                    8969402593f927350e2ceb4b5bc2a277f3754697c1961e3d6237da322257fbab42909e1a742e22223447f3a4805f8d8ef525432a7c3515a549e984d3eff72b23

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\data_reduction_proxy_leveldb\CURRENT

                                    Filesize

                                    16B

                                    MD5

                                    206702161f94c5cd39fadd03f4014d98

                                    SHA1

                                    bd8bfc144fb5326d21bd1531523d9fb50e1b600a

                                    SHA256

                                    1005a525006f148c86efcbfb36c6eac091b311532448010f70f7de9a68007167

                                    SHA512

                                    0af09f26941b11991c750d1a2b525c39a8970900e98cba96fd1b55dbf93fee79e18b8aab258f48b4f7bda40d059629bc7770d84371235cdb1352a4f17f80e145

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Local State

                                    Filesize

                                    10KB

                                    MD5

                                    54d18d0a1dbc8f16e5d73eada5a7a3f8

                                    SHA1

                                    03c263e5b1ce0c084df023244b7f9861676c5a06

                                    SHA256

                                    85df03e615b018d85dfc16e5c93cb9415a9e8de5e843f99c6f06eb574cf8f539

                                    SHA512

                                    da55bc95f2e3dfb3cea016c33e19624848e2a924c73716eebe8187da1030b6496ab2af74cccb0893a57e5824579fb665f8cffb36563c751a99977a5600e40b08

                                  • C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Local State

                                    Filesize

                                    11KB

                                    MD5

                                    959f90ad50ae9c3bf0745481430f3240

                                    SHA1

                                    93c2a892b7b45d46b8be5f6160f265d27296c3aa

                                    SHA256

                                    60b1eea8d1f1eceb8c74bf45c91147a4c61f8b3fe645448b2e27b2b09e1f3634

                                    SHA512

                                    3c42f467423c8b6693a4d1b5509b243f68d950eeed284983d2a4addc475a122c84ba694040f982051f4dd861e372a925321464e9d3555e9e973d2e2b9534f368

                                  • C:\Users\Admin\Downloads\MesterMC.exe:Zone.Identifier

                                    Filesize

                                    220B

                                    MD5

                                    b7ffc722851587302148e77c7c9edd53

                                    SHA1

                                    2c3fefbd9cfef06f5825a8d1a7b55aa2cccdec8f

                                    SHA256

                                    5a8be96fcee9fe75956b9856410b2daf178e02ecc3e809ae2c7718e48aaef647

                                    SHA512

                                    a5f1bb9ab4afae8846f4c2e3f857e582aaa78c6467d92afe90d09855e81a6d0ea39901edf4c22feb373671c1f9bca866b88500987fa5148fa5317e7c1c7e745f

                                  • C:\Users\Admin\Downloads\Unconfirmed 371400.crdownload

                                    Filesize

                                    622KB

                                    MD5

                                    ae87665288c23826dc42936c88b5c601

                                    SHA1

                                    3d1852603a86f3846cb056bd5ff908dbc1b68d09

                                    SHA256

                                    212f5b38d07976823d2ba1ce3acdb85c1bf2d46361e352af56c05f333d5c8694

                                    SHA512

                                    5e9868a7241264d6bf290a58e71ba360353c7adebfbfee597632928bc683555e0f90e29ae4c4927348f551401fc6047518e9240ca2fd6402cc427febf80d4d6f

                                  • C:\Users\Admin\Downloads\java-version.txt

                                    Filesize

                                    147B

                                    MD5

                                    faf2f8b188047379978915849af13d28

                                    SHA1

                                    42ecb6f269f3dc3183d3b72b4216010f106d3317

                                    SHA256

                                    4ebfda517657bcc9f2b2e3c3cd13e58e9adef320c0ca1a8ac9aee888d4e1ef8e

                                    SHA512

                                    85c3afedfda0aa63edab3b1c5ed7ef8b06e392d387ea3c16bd28c66a54f72c7cbdd14b8af9428168402313f8a4d203be7e5f8a6732d0d8d52d46fe3963ebde79

                                  • memory/3540-197-0x0000017C3B320000-0x0000017C3B321000-memory.dmp

                                    Filesize

                                    4KB

                                  • memory/4624-201-0x0000000000400000-0x00000000004A7000-memory.dmp

                                    Filesize

                                    668KB

                                  • memory/4624-204-0x0000000000400000-0x00000000004A7000-memory.dmp

                                    Filesize

                                    668KB