Analysis

  • max time kernel
    93s
  • max time network
    81s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    14-11-2022 08:52

General

  • Target

    RFQ # 2075873.xls

  • Size

    511KB

  • MD5

    97e3a7667e8059ea5ab1a490fd143e59

  • SHA1

    1fd7e6aa7c2e4b3b712e8fda94c7193ef4a67dc9

  • SHA256

    a651e0f35126e939ac640191f047ae61ce3730fc6cf7cd8e62227e41125f79c6

  • SHA512

    9b17b3f9daf5322a39377866f95876ccd7947761ae761e60ba82da7add73e4a7922df5c4db40b3e0084450e252515bc1f833b3149962b37b322d923abd1e6e33

  • SSDEEP

    12288:pdNqrDx7XXXXXXXXXXXXUXXXXXXXrXXXXXXXXEmYQTm/TmIguOkIceSRsq2Za:gr5XXXXXXXXXXXXUXXXXXXXrXXXXXXXw

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5450700540:AAEJyEEV8BKgYUKmnCPZxp19kD9GVSRup5M/sendMessage?chat_id=5422342474

Signatures

  • BluStealer

    A Modular information stealer written in Visual Basic.

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde "C:\Users\Admin\AppData\Local\Temp\RFQ # 2075873.xls"
    1⤵
    • Enumerates system info in registry
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:1048
  • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
    "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
    1⤵
    • Blocklisted process makes network request
    • Loads dropped DLL
    • Launches Equation Editor
    • Suspicious use of WriteProcessMemory
    PID:1440
    • C:\Users\Public\vbc.exe
      "C:\Users\Public\vbc.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:1604
      • C:\Users\Public\vbc.exe
        "C:\Users\Public\vbc.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1556
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
          C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
          4⤵
          • Accesses Microsoft Outlook profiles
          • outlook_office_path
          • outlook_win_path
          PID:1728

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Public\vbc.exe

    Filesize

    852KB

    MD5

    573b0103956eb1c9f12e2a2adcc77846

    SHA1

    50e9fd321b9b1f39b6430b01941562ba924e40c0

    SHA256

    6c912191a6853ca9717c37053a4ab7014d6980e48d846a8c777e7ee056cf4a56

    SHA512

    ab26ac29ae7135cd6dcc5e95e6f9af290fadad9ab9afc87af60f38615a210a1a1d908d34e8796fe18108847b02cb51c1f6eb8f886237d1b0c8838edb5f4f9ef4

  • C:\Users\Public\vbc.exe

    Filesize

    852KB

    MD5

    573b0103956eb1c9f12e2a2adcc77846

    SHA1

    50e9fd321b9b1f39b6430b01941562ba924e40c0

    SHA256

    6c912191a6853ca9717c37053a4ab7014d6980e48d846a8c777e7ee056cf4a56

    SHA512

    ab26ac29ae7135cd6dcc5e95e6f9af290fadad9ab9afc87af60f38615a210a1a1d908d34e8796fe18108847b02cb51c1f6eb8f886237d1b0c8838edb5f4f9ef4

  • C:\Users\Public\vbc.exe

    Filesize

    852KB

    MD5

    573b0103956eb1c9f12e2a2adcc77846

    SHA1

    50e9fd321b9b1f39b6430b01941562ba924e40c0

    SHA256

    6c912191a6853ca9717c37053a4ab7014d6980e48d846a8c777e7ee056cf4a56

    SHA512

    ab26ac29ae7135cd6dcc5e95e6f9af290fadad9ab9afc87af60f38615a210a1a1d908d34e8796fe18108847b02cb51c1f6eb8f886237d1b0c8838edb5f4f9ef4

  • \Users\Public\vbc.exe

    Filesize

    852KB

    MD5

    573b0103956eb1c9f12e2a2adcc77846

    SHA1

    50e9fd321b9b1f39b6430b01941562ba924e40c0

    SHA256

    6c912191a6853ca9717c37053a4ab7014d6980e48d846a8c777e7ee056cf4a56

    SHA512

    ab26ac29ae7135cd6dcc5e95e6f9af290fadad9ab9afc87af60f38615a210a1a1d908d34e8796fe18108847b02cb51c1f6eb8f886237d1b0c8838edb5f4f9ef4

  • \Users\Public\vbc.exe

    Filesize

    852KB

    MD5

    573b0103956eb1c9f12e2a2adcc77846

    SHA1

    50e9fd321b9b1f39b6430b01941562ba924e40c0

    SHA256

    6c912191a6853ca9717c37053a4ab7014d6980e48d846a8c777e7ee056cf4a56

    SHA512

    ab26ac29ae7135cd6dcc5e95e6f9af290fadad9ab9afc87af60f38615a210a1a1d908d34e8796fe18108847b02cb51c1f6eb8f886237d1b0c8838edb5f4f9ef4

  • memory/1048-58-0x0000000076171000-0x0000000076173000-memory.dmp

    Filesize

    8KB

  • memory/1048-68-0x0000000072A5D000-0x0000000072A68000-memory.dmp

    Filesize

    44KB

  • memory/1048-54-0x000000002FC31000-0x000000002FC34000-memory.dmp

    Filesize

    12KB

  • memory/1048-57-0x0000000072A5D000-0x0000000072A68000-memory.dmp

    Filesize

    44KB

  • memory/1048-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1048-55-0x0000000071A71000-0x0000000071A73000-memory.dmp

    Filesize

    8KB

  • memory/1556-95-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1556-77-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1556-81-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1556-96-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1556-72-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1556-73-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1556-75-0x0000000000400000-0x000000000046E000-memory.dmp

    Filesize

    440KB

  • memory/1604-71-0x0000000005120000-0x00000000051A4000-memory.dmp

    Filesize

    528KB

  • memory/1604-70-0x0000000007EC0000-0x0000000007F7A000-memory.dmp

    Filesize

    744KB

  • memory/1604-69-0x00000000004D0000-0x00000000004DC000-memory.dmp

    Filesize

    48KB

  • memory/1604-67-0x00000000004F0000-0x0000000000508000-memory.dmp

    Filesize

    96KB

  • memory/1604-65-0x0000000001340000-0x000000000141C000-memory.dmp

    Filesize

    880KB

  • memory/1728-85-0x0000000000270000-0x00000000002D6000-memory.dmp

    Filesize

    408KB

  • memory/1728-87-0x0000000000270000-0x00000000002D6000-memory.dmp

    Filesize

    408KB

  • memory/1728-90-0x0000000000270000-0x00000000002D6000-memory.dmp

    Filesize

    408KB

  • memory/1728-92-0x0000000000270000-0x00000000002D6000-memory.dmp

    Filesize

    408KB

  • memory/1728-94-0x00000000048B0000-0x000000000496C000-memory.dmp

    Filesize

    752KB