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Analysis

  • max time kernel
    117s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    30/09/2022, 23:13

General

  • Target

    file.exe

  • Size

    233KB

  • MD5

    66434467c3e517ff2b658695389ad049

  • SHA1

    f057b1e4617eaccb9b10c41f1c5684f577df2a77

  • SHA256

    7875a44f2882e5189ee7a3196bca5384fa63f7a5d157432dcc0e289df76e50f6

  • SHA512

    58728baf12ee29af0a666bff19a2750e7153b641ace00681c133f61bc7af959cac5e84d227f7f9ecd18c1a04843cb2fbe88965fe4977fb8f0cc613bd8f4c3055

  • SSDEEP

    3072:7IAUyweDLPRt0dxETp67eptLMuf4P27lhHnAdnwOx1Tm2whPTm1w/a8K+YdAFd:+eD3dCIQV2BhHnAdwOxohPow/CAFd

Score
10/10

Malware Config

Extracted

Family

nymaim

C2

208.67.104.97

85.31.46.167

Signatures

  • NyMaim

    NyMaim is a malware with various capabilities written in C++ and first seen in 2013.

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 19 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:740
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c start /I "" "C:\Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Cleaner.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:1604
      • C:\Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Cleaner.exe
        "C:\Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Cleaner.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:620
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 620 -s 1152
          4⤵
          • Program crash
          PID:1664
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "file.exe" /f & erase "C:\Users\Admin\AppData\Local\Temp\file.exe" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2044
      • C:\Windows\SysWOW64\taskkill.exe
        taskkill /im "file.exe" /f
        3⤵
        • Kills process with taskkill
        • Suspicious use of AdjustPrivilegeToken
        PID:1140

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Bunifu_UI_v1.5.3.dll

    Filesize

    236KB

    MD5

    2ecb51ab00c5f340380ecf849291dbcf

    SHA1

    1a4dffbce2a4ce65495ed79eab42a4da3b660931

    SHA256

    f1b3e0f2750a9103e46a6a4a34f1cf9d17779725f98042cc2475ec66484801cf

    SHA512

    e241a48eafcaf99187035f0870d24d74ae97fe84aaadd2591cceea9f64b8223d77cfb17a038a58eadd3b822c5201a6f7494f26eea6f77d95f77f6c668d088e6b

  • C:\Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Cleaner.exe

    Filesize

    4.0MB

    MD5

    a1a19faf0af29841daeeaad999d899bd

    SHA1

    f67b9afdab167d5bcc544358b0e7fd2858784508

    SHA256

    f349739486dcb45f7cd39440784224c66a5d2c4bd2a47c48606e2f481a0fabe7

    SHA512

    a66ec486262e797bafd4fa032a719e499217993479fa78938e43db13289fe6fefc0ef3c3359e3cacb6223134396852be7cc9122c46ae74db3e9842d7f4fe65a8

  • C:\Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Cleaner.exe

    Filesize

    4.0MB

    MD5

    a1a19faf0af29841daeeaad999d899bd

    SHA1

    f67b9afdab167d5bcc544358b0e7fd2858784508

    SHA256

    f349739486dcb45f7cd39440784224c66a5d2c4bd2a47c48606e2f481a0fabe7

    SHA512

    a66ec486262e797bafd4fa032a719e499217993479fa78938e43db13289fe6fefc0ef3c3359e3cacb6223134396852be7cc9122c46ae74db3e9842d7f4fe65a8

  • \Users\Admin\AppData\Local\Temp\fBOp9sDLUasmnYPr9qiq7q6I\Cleaner.exe

    Filesize

    4.0MB

    MD5

    a1a19faf0af29841daeeaad999d899bd

    SHA1

    f67b9afdab167d5bcc544358b0e7fd2858784508

    SHA256

    f349739486dcb45f7cd39440784224c66a5d2c4bd2a47c48606e2f481a0fabe7

    SHA512

    a66ec486262e797bafd4fa032a719e499217993479fa78938e43db13289fe6fefc0ef3c3359e3cacb6223134396852be7cc9122c46ae74db3e9842d7f4fe65a8

  • memory/620-64-0x000007FEFB9B1000-0x000007FEFB9B3000-memory.dmp

    Filesize

    8KB

  • memory/620-66-0x0000000000500000-0x0000000000542000-memory.dmp

    Filesize

    264KB

  • memory/620-63-0x0000000001030000-0x0000000001188000-memory.dmp

    Filesize

    1.3MB

  • memory/740-56-0x0000000000220000-0x000000000025F000-memory.dmp

    Filesize

    252KB

  • memory/740-57-0x0000000000400000-0x0000000000597000-memory.dmp

    Filesize

    1.6MB

  • memory/740-54-0x0000000075A81000-0x0000000075A83000-memory.dmp

    Filesize

    8KB

  • memory/740-55-0x00000000006BD000-0x00000000006E4000-memory.dmp

    Filesize

    156KB

  • memory/740-67-0x00000000006BD000-0x00000000006E4000-memory.dmp

    Filesize

    156KB

  • memory/740-68-0x0000000000400000-0x0000000000597000-memory.dmp

    Filesize

    1.6MB

  • memory/740-70-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/740-75-0x0000000000400000-0x0000000000597000-memory.dmp

    Filesize

    1.6MB