Analysis

  • max time kernel
    148s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/01/2024, 00:06

General

  • Target

    7e5bdca7a9de1721844c83a9736f4247.exe

  • Size

    532KB

  • MD5

    7e5bdca7a9de1721844c83a9736f4247

  • SHA1

    46275c285cb45b0c86027e70f46efd5bee8de520

  • SHA256

    cd7a63b7832ec167c20e80bfa0e5868b76a783fe0ccfd94f9a0c451aa6071848

  • SHA512

    d94dba5101b7b1bdf70fcd1d22acb7322a035bcc82696f591f58d95784062e7c4c655674b2c1efdf64e072c339239384a876ca7e94764f1322c057d66dbc9751

  • SSDEEP

    12288:hDu9km32xPExY8th3idkuAgul3a9xvqBFHkadO4ceNw3c6RHRkfWdDH:tRm3YP+tRSnAgu89wmadO4ceJ0R5L

Malware Config

Signatures

  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 33 IoCs
  • Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Writes to the Master Boot Record (MBR) 1 TTPs 3 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in System32 directory 18 IoCs
  • Drops file in Windows directory 13 IoCs
  • Modifies registry class 47 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7e5bdca7a9de1721844c83a9736f4247.exe
    "C:\Users\Admin\AppData\Local\Temp\7e5bdca7a9de1721844c83a9736f4247.exe"
    1⤵
    • Writes to the Master Boot Record (MBR)
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:368
    • C:\Windows\SysWOW64\regsvr32.exe
      C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\a1l8.dll"
      2⤵
        PID:1696
      • C:\Windows\SysWOW64\regsvr32.exe
        C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\b4cb.dll"
        2⤵
          PID:3312
        • C:\Windows\SysWOW64\regsvr32.exe
          C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\4f3r.dll"
          2⤵
            PID:5044
          • C:\Windows\SysWOW64\regsvr32.exe
            C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\8b4o.dll"
            2⤵
              PID:4864
            • C:\Windows\SysWOW64\bffd.exe
              C:\Windows\system32\bffd.exe -i
              2⤵
              • Executes dropped EXE
              PID:1076
            • C:\Windows\SysWOW64\regsvr32.exe
              C:\Windows\system32\regsvr32.exe /s "C:\Windows\system32\8b4o.dll"
              2⤵
              • Loads dropped DLL
              • Installs/modifies Browser Helper Object
              • Modifies registry class
              PID:4712
            • C:\Windows\SysWOW64\bffd.exe
              C:\Windows\system32\bffd.exe -s
              2⤵
              • Executes dropped EXE
              PID:1020
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32 C:\Windows\system32\841e.dll, Always
              2⤵
              • Loads dropped DLL
              PID:2880
          • C:\Windows\SysWOW64\bffd.exe
            C:\Windows\SysWOW64\bffd.exe
            1⤵
            • Drops file in Drivers directory
            • Executes dropped EXE
            • Loads dropped DLL
            • Writes to the Master Boot Record (MBR)
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of WriteProcessMemory
            PID:2156
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32 C:\Windows\system32\841e.dll,Always
              2⤵
              • Loads dropped DLL
              • Writes to the Master Boot Record (MBR)
              • Drops file in System32 directory
              PID:4836

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\b.dll

                  Filesize

                  144KB

                  MD5

                  3ad9d67366ba7950c0c70a5d0cc18310

                  SHA1

                  f481dca0f6885956038c8998985a7107ef82be4d

                  SHA256

                  e50d155a5e24b20d5c44055d80b675cca88ed722b7d717e337cb4c60e3c6e856

                  SHA512

                  520489ea6973deb0148247a32c25df4fc8548f99660e31b37c20897299d25fb5841ca7a125dae1ea26694f1a6d9316a5809a46ec397cec96478918129bae0c2a

                • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\p.dll

                  Filesize

                  361KB

                  MD5

                  f745274c0ad4b3014d25ef4595b56f60

                  SHA1

                  d482c7cbb23f37ad15f2ee419ad014085063028a

                  SHA256

                  8b8ab05a1d8f50ca820985b037c0ec8cfd864ff092fe1a43af1b0aff2bac48a7

                  SHA512

                  f68027778cecf433159d45e0ee8f0d029cb4ef7db9fa1bb022c81bc7ff6ec7387b9d2c1b1f98fae260c28325e5a5bf299fbc72d85861b7443df2de49baa0d367

                • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\s.exe

                  Filesize

                  149KB

                  MD5

                  edb62ecd3d31b43e8194996982dce53c

                  SHA1

                  924624deb4210e94471b7ba464343aec98c03b59

                  SHA256

                  666df739eb0396c86a0a73fdf779954faf7821558dd50428cf1db6578ea3afcc

                  SHA512

                  7ca762b79923781922df2d68790923114b6792114e202e143d816ab7d968c617adf53d179d16dd2d84dabf740aab942e2876da4dedf7bf8ade9a488348572c7d

                • C:\Windows\SysWOW64\841e.dll

                  Filesize

                  391KB

                  MD5

                  182e8ceeefe888f219a5b07ff9b6601a

                  SHA1

                  4129e8c2390df93545c813067a6fe9f27aa83a4f

                  SHA256

                  a8f3d28d09e941c789c08a759ba61830db9a796626d5eff2e17d23468b4a58cf

                  SHA512

                  3e5a7967051696d158be9c717b896fea75758ec65ff985915815070185c1b8917a14733cef744267d1bd5cc8c36fcb7afca54ed1905bdb7fb8d5a220e5509ab5

                • C:\Windows\SysWOW64\841e.dll

                  Filesize

                  341KB

                  MD5

                  0eb3bbb0fcda70825c3b4392c074a571

                  SHA1

                  54151f28bf78af7f1d94ba0621ee848f3e4ea6a7

                  SHA256

                  d679e257c160520841f5ffe8eec5f576fc1133ca81233e27e61dac77a2d39c92

                  SHA512

                  aa12d8a2d02031b438393bbc2f8d24bb65efd0a55204b99c6d67465d962be213743536691be7adf1564e438d35d577aefecab41ebe8bd421554a903e3b900601

                • C:\Windows\SysWOW64\841e.dll

                  Filesize

                  471KB

                  MD5

                  161fd0d34aecccd90606bf2232225efa

                  SHA1

                  7496575b9277184db4146925c87c14cc59384bc6

                  SHA256

                  92068f77b170042b969dd8fd3bd79979ab9c8177c9854f8f7010786b4f086fb9

                  SHA512

                  2257a9fddfaffac0e13f1f41b087936845f35fc4570de38cf83e0420d37c68a19742a8115601df6e1398d2bb8ac8b5c19d5e4c6d07f412dffc46e810529daea7

                • C:\Windows\SysWOW64\8b4o.dll

                  Filesize

                  130KB

                  MD5

                  87d5d4fa92a6d267616e1c7e973a9578

                  SHA1

                  04e3baf0e07c521d2afac84c5470bb0563eaae0e

                  SHA256

                  ab1f8f215a291f6d0bdf716fd80b63fb245561c971a5d22902bc6a6f1ef12789

                  SHA512

                  bff6a76db2acb134489812db8a2730f10de8b2f4e82292fe5721f9e6d53b15805a13138109f5cccf5b03a6d217fc2074d738bd6f0539bd492adff193b501c3df

                • C:\Windows\SysWOW64\8b4o.dll

                  Filesize

                  66KB

                  MD5

                  bb29d099643c35485c6048e5d78eadf7

                  SHA1

                  9dc4a76f99ccd1cc09c1899ca699c9719eb8a809

                  SHA256

                  2da7f8acb5e4ac41c9bd910961bd562f92c589b212bf7d1021fc42c1a2670bba

                  SHA512

                  1cd2119a2b82f6f1861285642680ab2c6fb5074a7ab3d261ac949bcebfd520be5221515a343369b6cd05c88b9e51a7f296aab75de78c12bc120180cfe85bd802

                • C:\Windows\SysWOW64\8b4o.dll

                  Filesize

                  57KB

                  MD5

                  40793bbe80c10cb72bf5bf096a17dafa

                  SHA1

                  e8955e67885e370d0e74597358f8023694e9b40a

                  SHA256

                  3836f9d53189aa7774c03d0b6e628d4e7207befa2ddd4e960bee3f7a4d04baac

                  SHA512

                  4e60e378d2e37dbb71c21e6d2070f3afda4e60210ef8188587b157b93c004f574ce1c0de403564885b2d4d182ccd8b6a359a9708ea22f3eced262f0add2047b6

                • C:\Windows\SysWOW64\8b4o.dll

                  Filesize

                  92KB

                  MD5

                  282b469c534e41acb8ba17cfb671b528

                  SHA1

                  73ef88842755c8eb9dc8fa8fd2fd4ca254b7951b

                  SHA256

                  c355b027b0a6668d981cab7ffab621e4639b4f046bb60a5c01348ac8d46352b3

                  SHA512

                  1c715e387c6a830ddcb9e216deb97388a8e2f432d9610c0aec735ed109c693118ad2f79f224484e102e7f66412f1ecc06c53cf162cf950ada987ee0ad376e536

                • C:\Windows\SysWOW64\8b4o.dll

                  Filesize

                  1KB

                  MD5

                  a9c09f6ffee3a407d779a39e114fdaea

                  SHA1

                  b280019ba0f0ff1b6cebf5cf2a0f9345a639eb55

                  SHA256

                  eaf3d63f1f1a7c3ce32fe296e28f964995d3a7c967f9f186302a2cf4415c8d65

                  SHA512

                  079727a974986744fcf5d625d9026b38bc25458b3dbcf9862677f5a589f321ec79e4717afbd1b7d966608ea7f3e1c741513faca667f17badca86879d19806d9c

                • C:\Windows\SysWOW64\8b4o.dll

                  Filesize

                  90KB

                  MD5

                  31fff0c4a84f3c1a0a52fa6df0250f39

                  SHA1

                  25c800aa4f0b7a3ddc2dc261b5140c9cd1935aa8

                  SHA256

                  d57349a2bce03564278fd3c0f098f0f7ab609eba70ac9ef0f4978aacb0ab9f93

                  SHA512

                  aefc9d7ad6f9d24da99aaeceea6f5fc8134653eb89426a7c60c48fcdc985be9158f98638b1e52298452aea60f49d3b7ecb1d8ff07fab26a186166c3e593befd3

                • C:\Windows\SysWOW64\bffd.exe

                  Filesize

                  129KB

                  MD5

                  ed5f92e9c8b0290cfd0ea5a13cf60ff2

                  SHA1

                  58c5a35d9d5b361ac569249652c07bcdb73de748

                  SHA256

                  8f43e235396bd586a016303700faacc1fbbd060d0c033b27170765a054d2babd

                  SHA512

                  fd3739649bb95d520a2af4fa842158c3375975a706768a7a16e93e6192fbabd96fcc3565c8cc7d006ab246bbf532dfcebe2ce9f6a07d084e437be557a22fc8e6

                • C:\Windows\SysWOW64\bffd.exe

                  Filesize

                  220KB

                  MD5

                  7fb1fb643ad9be21dbabf59ea454a798

                  SHA1

                  e46e3efbce759905fcf4d1dffd5bd0bfff97ced1

                  SHA256

                  fe3ce8549c72bd76836efbe0d7b01ffee4806803e0b4185e7679c4f8f5b6a4ed

                  SHA512

                  ec20e16aaa81b0ef7d26900cc7ecc7dd12d39f887e476d86713ddcac11cd1b4fbea3c7153ea5c7086cf769d955975aa5341cbdbb457198ed468de553a134cf62

                • C:\Windows\SysWOW64\bffd.exe

                  Filesize

                  216KB

                  MD5

                  4d2287e73849ffaf81d3314d8e682115

                  SHA1

                  beceb37eeb6a049586841393036cd941bf0b9bad

                  SHA256

                  48c3b9ee37e0ff57af6b811f468fe6cd2ecc2b2c0e04745436acbb00a773bad5

                  SHA512

                  aa083804317452884404dc39c7d30f27718c78cce516e3f8209baea3a3f8059433b47efe8d474eedd996049542cb2c9b84aa0d4414ff64f07c2ce63ff6d32b87

                • C:\Windows\SysWOW64\bffd.exe

                  Filesize

                  200KB

                  MD5

                  4fb03f1e2e80b7a8ca6f64e605cf4e98

                  SHA1

                  1b13776fb5a51fcc6397aa309dbc586cb10e0516

                  SHA256

                  8590460ba14ca4d069888412a82dbc9a058604c405e217bfe2096f967afeed78

                  SHA512

                  16d47402a95ed8c5b1c9e5973622be589a442ff93741fd0d02d9cbdbc39b52f13bd735e96cfa632876342bd80b2459a0dcf2f4729d3907f66a1dc26a4b5504a0