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Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231127-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/12/2023, 15:51

General

  • Target

    tuc4.exe

  • Size

    6.9MB

  • MD5

    8414fe2ac1247650f33d24c59a1e810c

  • SHA1

    85efb140e6a8ea7d5de2d66f6e48423e52253154

  • SHA256

    85d5367d4e844cbd05e5d81acdddabe8b43227d29fe92848d01562786289cf1f

  • SHA512

    9bf0bdaeb30d2b5d398ba143f91bafc0d6835281119a14cec9d23c9096a0692c1bfca4c32ff05946e977787eade74cc3471e5f49878971a46ce39fde3d6f8de8

  • SSDEEP

    196608:RDoG3bFqjpLC0TSMLsn33HR83v9i8l7INzj:RDyNLCWZ2HS9iQ7INzj

Score
7/10

Malware Config

Signatures

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 3 IoCs
  • Unexpected DNS network traffic destination 2 IoCs

    Network traffic to other servers than the configured DNS servers was detected on the DNS port.

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Drops file in Program Files directory 63 IoCs
  • Runs net.exe
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\tuc4.exe
    "C:\Users\Admin\AppData\Local\Temp\tuc4.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:708
    • C:\Users\Admin\AppData\Local\Temp\is-DU59T.tmp\tuc4.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-DU59T.tmp\tuc4.tmp" /SL5="$D005C,6971036,68096,C:\Users\Admin\AppData\Local\Temp\tuc4.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:4996
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\system32\schtasks.exe" /Query
        3⤵
          PID:2880
        • C:\Program Files (x86)\ConvertWMA\wmaconvert.exe
          "C:\Program Files (x86)\ConvertWMA\wmaconvert.exe" -i
          3⤵
          • Executes dropped EXE
          PID:1160
        • C:\Program Files (x86)\ConvertWMA\wmaconvert.exe
          "C:\Program Files (x86)\ConvertWMA\wmaconvert.exe" -s
          3⤵
          • Executes dropped EXE
          PID:2412
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\system32\net.exe" helpmsg 11
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4752
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 helpmsg 11
            4⤵
              PID:4476

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Program Files (x86)\ConvertWMA\wmaconvert.exe

        Filesize

        1.8MB

        MD5

        9810b60c49cadedbd695bf93043e605d

        SHA1

        a0854d5cabc61d346d4d5e63c69db0624e841f4e

        SHA256

        f2db4b1f32427bac368e6107689ed91b415a6fb7704eefc0977cbbb083fca60c

        SHA512

        2b98cac6609a3a708c43a596c836901b6133c7f187e36367cc58cd9e11f5874de113a9bd8a71d710d57f26a840cf52402b5bfa020c6d543c0171d14858695fe7

      • C:\Program Files (x86)\ConvertWMA\wmaconvert.exe

        Filesize

        1.6MB

        MD5

        b106c8f4dca680c17cd51f60c764c863

        SHA1

        9083cbad4e61f9e58712da82fc8c1b3a0f2404e1

        SHA256

        ba08454ecf9f1169ba5515968df3a8344c69cf4bbc466f6bff2b4ac90945c692

        SHA512

        971b872a1270c766767a2bdb3ede8eb7f65d03a5cf5d3046db87f335c3b738e61cac579bb35c37ef75ac04e722ddd89ffb96f34925d5fee9fc767486e29bef87

      • C:\Program Files (x86)\ConvertWMA\wmaconvert.exe

        Filesize

        534KB

        MD5

        0db1e6394f3f21a539bf72510efd3f38

        SHA1

        54ac676a568d6a56e218cc07e188bff6a5120089

        SHA256

        335c11e35ee5b30656813598af0092d0cec330b7d6ed38ae37373344d4b08e49

        SHA512

        acb1e855ae246c11ce02f937186820d7238c79dc7f858b0d95bee72076e167730d36371f128567a776b34d57ca45937d2baf79fe3448da01dee8bab94f4b79dc

      • C:\Users\Admin\AppData\Local\Temp\is-4O9VM.tmp\_isetup\_iscrypt.dll

        Filesize

        2KB

        MD5

        a69559718ab506675e907fe49deb71e9

        SHA1

        bc8f404ffdb1960b50c12ff9413c893b56f2e36f

        SHA256

        2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

        SHA512

        e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

      • C:\Users\Admin\AppData\Local\Temp\is-4O9VM.tmp\_isetup\_isdecmp.dll

        Filesize

        19KB

        MD5

        3adaa386b671c2df3bae5b39dc093008

        SHA1

        067cf95fbdb922d81db58432c46930f86d23dded

        SHA256

        71cd2f5bc6e13b8349a7c98697c6d2e3fcdeea92699cedd591875bea869fae38

        SHA512

        bbe4187758d1a69f75a8cca6b3184e0c20cf8701b16531b55ed4987497934b3c9ef66ecd5e6b83c7357f69734f1c8301b9f82f0a024bb693b732a2d5760fd303

      • C:\Users\Admin\AppData\Local\Temp\is-DU59T.tmp\tuc4.tmp

        Filesize

        687KB

        MD5

        f448d7f4b76e5c9c3a4eaff16a8b9b73

        SHA1

        31808f1ffa84c954376975b7cdb0007e6b762488

        SHA256

        7233b85eb0f8b3aa5cae3811d727aa8742fec4d1091c120a0fe15006f424cc49

        SHA512

        f8197458cd2764c0b852dac34f9bf361110a7dc86903024a97c7bcd3f77b148342bf45e3c2b60f6af8198ae3b83938dbaad5e007d71a0f88006f3a0618cf36f4

      • memory/708-0-0x0000000000400000-0x0000000000418000-memory.dmp

        Filesize

        96KB

      • memory/708-160-0x0000000000400000-0x0000000000418000-memory.dmp

        Filesize

        96KB

      • memory/708-2-0x0000000000400000-0x0000000000418000-memory.dmp

        Filesize

        96KB

      • memory/1160-152-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/1160-151-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/1160-154-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/1160-155-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-179-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-193-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-157-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-209-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-162-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-205-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-166-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-167-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-170-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-173-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-176-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-202-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-181-0x0000000000710000-0x00000000007AE000-memory.dmp

        Filesize

        632KB

      • memory/2412-186-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-189-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-190-0x0000000000710000-0x00000000007AE000-memory.dmp

        Filesize

        632KB

      • memory/2412-159-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-196-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/2412-199-0x0000000000400000-0x00000000005CF000-memory.dmp

        Filesize

        1.8MB

      • memory/4996-7-0x00000000005D0000-0x00000000005D1000-memory.dmp

        Filesize

        4KB

      • memory/4996-163-0x00000000005D0000-0x00000000005D1000-memory.dmp

        Filesize

        4KB

      • memory/4996-161-0x0000000000400000-0x00000000004BC000-memory.dmp

        Filesize

        752KB