Analysis

  • max time kernel
    149s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    25-01-2024 17:27

General

  • Target

    duisc.exe

  • Size

    262KB

  • MD5

    28199122b75f244cd44d2dfc0107dc03

  • SHA1

    5a8b0ad0cdd4864d421916f5034a6913035750c1

  • SHA256

    a345cbd37c52c9926d789826a82f1d1a17986d1833e21ffc97afed70e1a0a4e1

  • SHA512

    331755f64a8d41332e59787b628f26c526340bc73eb7acbecf1fe6ac461710d6b97fa524556ac53a23118f2e0f4649659701ca018d47e9749c3901c2f71aebe5

  • SSDEEP

    3072:XHYR8jkJ5y+wLjOKWeKI9hyqfDydmfPmbAT2V1p9p7/Wg8gV6tZy4co28kd+06bb:oEXueBjyAGkqV1pPWVw4BEe5uqmGv

Malware Config

Signatures

  • Blocklisted process makes network request 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 19 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

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

  • Drops file in System32 directory 21 IoCs
  • Modifies registry class 51 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 35 IoCs

Processes

  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k DcomLaunch
    1⤵
      PID:592
    • C:\Windows\Explorer.EXE
      C:\Windows\Explorer.EXE
      1⤵
        PID:1340
        • C:\Users\Admin\AppData\Local\Temp\duisc.exe
          "C:\Users\Admin\AppData\Local\Temp\duisc.exe"
          2⤵
          • Loads dropped DLL
          • Adds Run key to start application
          • Drops file in System32 directory
          • Suspicious use of WriteProcessMemory
          PID:2948
          • C:\Windows\SysWOW64\msibm\CFSQdll.exe
            C:\Windows\system32\msibm\CFSQdll.exe 20
            3⤵
            • Executes dropped EXE
            • Loads dropped DLL
            PID:1444
          • C:\Windows\SysWOW64\Rundll32.exe
            Rundll32.exe C:\Windows\system32\msibm\cfsbho.dll,firstGenGuid
            3⤵
            • Loads dropped DLL
            • Drops file in System32 directory
            PID:2284
          • C:\Windows\SysWOW64\RunDll32.exe
            RunDll32.exe C:\Windows\system32\msibm\cfsbho.dll,regUser
            3⤵
            • Blocklisted process makes network request
            • Loads dropped DLL
            • Installs/modifies Browser Helper Object
            • Modifies registry class
            PID:1076
          • C:\Windows\SysWOW64\RunDll32.exe
            RunDll32.exe C:\Windows\system32\msibm\cfsys.DLL,cfs
            3⤵
            • Blocklisted process makes network request
            • Loads dropped DLL
            • Drops file in System32 directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:2288

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Windows\SysWOW64\ibmuuid_.dll

        Filesize

        36B

        MD5

        08a16329aa2f741cecfaa68648d64fea

        SHA1

        ebd2cb24160f5071669cdd7991c55ad454a3afc5

        SHA256

        bfe156c8ce561dc0322d9595cfdbf00547630fa867c1b455246dfaeb852f4e84

        SHA512

        b45d000ae8496557cfc52d5ecbbb2685ccb3771adaed4e5843b06ebcf3957cfb6cd6fa06da58e0451bb89f321e09a815fd86821fbc2dcbb0d07becd15b400c33

      • C:\Windows\SysWOW64\ibmvdr_.dll

        Filesize

        6B

        MD5

        67235f0ee23bb5d9bfe272daec727c3a

        SHA1

        2020834bddfd82c85922ba6293277dd4047ec127

        SHA256

        4c31b850b9373f1a31705b3327cc8b0ac529a6a7aa5c86979c51b422d6a1afcc

        SHA512

        18e0adde1f8d4f9f5c51e74cbbb7c71c6843870f3e99f2e6ce81f92d3c1bd83a35116ba1f99b6582aae0c4dde83f616b5490cc12871e5cd3e54222e0ec219017

      • C:\Windows\SysWOW64\msibm\cfsbho.dll

        Filesize

        108KB

        MD5

        bbd57beecd1b6ad25e0999c4a282ce5b

        SHA1

        113868e00c2453208aacc597a3a92025c365a982

        SHA256

        8af777f8f08b7429a54500a5cd67ec2e3ef03d5f9cd54fdd5c7ed0d71ac0562e

        SHA512

        53e5e14f8c191227a7c047632a71cb2c676ecd4b70b6c93bdcede4c8681a9c30d9fe13a439e056bcf7a127d85915a9672625d001201c565b8b7a6db3e844830d

      • C:\Windows\SysWOW64\msibm\cfsupd.dll

        Filesize

        38KB

        MD5

        3aa48085d85a531f5e4db131704b246c

        SHA1

        9232b4ae722d157eee5ff2eadb7221519a3de5b8

        SHA256

        2041d2c62945abcb2bb8be0267e728f6bfd8d35b437726e67ca685713f74eec4

        SHA512

        e866809293b9c3f6127d5a1beb747853d4132a5b19289cd722550e101bdf09055b030a7a803bdacc60a5ad9c7973bca426c861871c0703575d14de90b6bcbb74

      • C:\Windows\SysWOW64\msibm\cfsys.DLL

        Filesize

        187KB

        MD5

        6d7a20743ac066b025c09a4499448264

        SHA1

        5c15f4ae14c6c80c98ab97d2b98284598b9c3a21

        SHA256

        6331da561903d8d7fe6eca059899f85956a69786f43d01dfd96c19c85b181473

        SHA512

        1e8f0dc039838ee809403336a031f1b2940e90c531e170b3d42a189491766df182b2d40d7f238cfd2ce5d6c1949a403c590d258c5cb2fd8004e0c2aebac1949d

      • C:\Windows\SysWOW64\msibm\intro.tpl

        Filesize

        161B

        MD5

        e0782089e9f016369e89a4ec36474355

        SHA1

        a364f107081a899aea66ed73403dfc19041ea3f5

        SHA256

        c09efa49ecdb14dbd0dae118f3ba4ac30ecb4fe2db9e5bfe2874403733e99d46

        SHA512

        fff1a002e575ecf1f43573e2278f246ee72d007ac008f81717ecd0a9a003e969d2e91a28019e29912ed4741f1f3d9bed43adc14bfa48d80bd471df47825b9cfe

      • C:\Windows\SysWOW64\msibm\post.tpl

        Filesize

        160B

        MD5

        7ba5508ca1abca116183c1dcdbcf31d2

        SHA1

        c006df723e7ce851387345efe880c2fb7796d330

        SHA256

        0057b6b6acd17a102867a24e4927cdc487db31930c8769ad5271497757546e3e

        SHA512

        31dae4340d02815a0529cabe88fcad6a1e127776076d6172a1d7a76ed54cd0ecb86fec9aede5db9bf37278b47de857bc4c738d2fa30bfb635181492f8a8bd21b

      • \Windows\SysWOW64\msibm\CFSQdll.exe

        Filesize

        22KB

        MD5

        445bf68113cac1d07e9a516b7ed830f0

        SHA1

        1598230ef36de04c49dd2e686f900945e9cb7fe1

        SHA256

        bf1c8e186191be9fc93626424b834982b7fa1fde7e8f659fbb72982991746f90

        SHA512

        3919c36ecf075d35051e185b8254acbeeed54a1c76004dae5ba3f09fab4bec50e6c29622269c1c892e927e52cff8dd8a5f7851e780d9a67d58b369bbff194184

      • \Windows\SysWOW64\msibm\cfs7zd.DLL

        Filesize

        14KB

        MD5

        379f4f2560c2d11838676ffcabeee8dd

        SHA1

        b88999a424f7306eb2000955f5d8f1424160d1b2

        SHA256

        65aaaad675bda642ae296a89a6a4da29693ed094c5db200470f32637164820c3

        SHA512

        4861bb5ad9d1eacc6d92ec8554b81c25c5be3544d93c1200b7784cf2aaa2ea32247d13cfebdecfbc8bd637959643e5808922cf2b57685057f36cdaf3a196f22d

      • \Windows\SysWOW64\msibm\cfsbho.dll

        Filesize

        89KB

        MD5

        36d567bc063d7e4f8eaa3f3d38ba3bc9

        SHA1

        6876ed4adab518904edc4adf6e94ed033413411a

        SHA256

        ec7fd2972d318e78a3209fde3baa560fd4e9946401363d6d603c505e840b16eb

        SHA512

        dbcc0c769d115b399e40303adbcb5bd31d6eee4a16232068a923b541dcdcae727ebe4b039b1c43886cdfdb18a2e965f67fc684a06c1bddaea771fb6cec1b70df

      • \Windows\SysWOW64\msibm\cfsbho.dll

        Filesize

        62KB

        MD5

        2acfc45ab6aef48f55b1955ec58b5ef9

        SHA1

        81d526a1973a7825b76573f173f61762e8e09c28

        SHA256

        9674305517a054c1aa2f8758c030595831f1684965e5eb72b217e8878cdec475

        SHA512

        4697b7ad75d10d547c1b96cbbd42f0a351f055ea54eb16a356eaf6d3f8006af8c97ee9c6b63c166f7843543b961a63e0cdf32a751b4564d8cafc7002d9c03381

      • \Windows\SysWOW64\msibm\cfsbho.dll

        Filesize

        130KB

        MD5

        f967f2d1ae78ae5b5008dc6de13682b7

        SHA1

        16ce4cba1d7fc76365952b14292671e47b1d1e4e

        SHA256

        ce884173c8d8a900ab2b1cb1926b0ea87a74263be6065a4cb38a374682e0b260

        SHA512

        73e5257cc94efee13805ea2565ce7b5999dca52ace55562bdae656d73a1b5b839fc80f4939369540a65c50bd09d0a3061085ec12fea1f7da7c1a77ca279d5e3e

      • \Windows\SysWOW64\msibm\lowlvl.dll

        Filesize

        44KB

        MD5

        5ad7b028f0431453d05d5bedcdee3574

        SHA1

        c9f14c3530391461b74a4da359e1d0b7fdffad12

        SHA256

        d6a2fdaebae37652ae308a0103285eefc266081cda2114873cdba0d159f0159f

        SHA512

        22fd3a8e1fc8dedc8062905d4a81d3806c62eb10ce15468f6ec835dd8d6b6295dd17300a38fc02b6d1f7feef46045aea6d1bbbf334507bb34779ea7dd0aeaf9c

      • memory/1340-47-0x0000000002D70000-0x0000000002D71000-memory.dmp

        Filesize

        4KB