Analysis

  • max time kernel
    102s
  • max time network
    50s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    03-10-2022 07:12

General

  • Target

    REVISED INVOICE.xlsx

  • Size

    180KB

  • MD5

    4f12f3d51d9d16c64b0a4b826bbc5b11

  • SHA1

    f1e8d4ac587fc56e83fff309b7e4684298e3d8c0

  • SHA256

    29013957f0c83fb4e8b4c8e8461b17987fa66101fc438c07d0e89c42aa3db4e2

  • SHA512

    e1cbe000d390c3a276a7b067fabdb25814aea2b96c06375171a72d8c65992c46e12806a5fc77272034ec1be5ef0653c980f5d2e5546cea8d64895d128e58a0ee

  • SSDEEP

    3072:OuLGZNKq0qSv+tiKx9RT8FhaWAbVnXLxZryxVsE3h3SY2W8U+6oEgVPAsW+mS:4ZNwVv0GtA9XdxyYER3d2W8hFEgRAr+P

Malware Config

Extracted

Family

agenttesla

C2

https://api.telegram.org/bot2134979594:AAFk4QkrlHlt2a-q-EhIoHZBbzxSH0QxiBI/sendDocument

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • AgentTesla payload 6 IoCs
  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Suspicious use of SetThreadContext 1 IoCs
  • 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 behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 16 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\REVISED INVOICE.xlsx"
    1⤵
    • Enumerates system info in registry
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:1324
  • 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:1304
    • C:\Users\Public\vbc.exe
      "C:\Users\Public\vbc.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:328
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
        "{path}"
        3⤵
        • Drops file in Drivers directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:332

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Public\vbc.exe

    Filesize

    563KB

    MD5

    227c17af92250eb0bdf0699aa960da49

    SHA1

    d61972c27c1c527e4045b8ae02bee2cecc1f0e1c

    SHA256

    0c62abe574a6b360a940fc43ecae0993eb52715bac6208ea56e2de5e1bc5892b

    SHA512

    2f63af39b7f4c6e262f4ce6fa41392dcc81746562f0d3f2624ec51528450a337be02739d046dd9062e0bc81a4c1bcbecee7adecdb434b119ad708aab07acf017

  • C:\Users\Public\vbc.exe

    Filesize

    563KB

    MD5

    227c17af92250eb0bdf0699aa960da49

    SHA1

    d61972c27c1c527e4045b8ae02bee2cecc1f0e1c

    SHA256

    0c62abe574a6b360a940fc43ecae0993eb52715bac6208ea56e2de5e1bc5892b

    SHA512

    2f63af39b7f4c6e262f4ce6fa41392dcc81746562f0d3f2624ec51528450a337be02739d046dd9062e0bc81a4c1bcbecee7adecdb434b119ad708aab07acf017

  • \Users\Public\vbc.exe

    Filesize

    563KB

    MD5

    227c17af92250eb0bdf0699aa960da49

    SHA1

    d61972c27c1c527e4045b8ae02bee2cecc1f0e1c

    SHA256

    0c62abe574a6b360a940fc43ecae0993eb52715bac6208ea56e2de5e1bc5892b

    SHA512

    2f63af39b7f4c6e262f4ce6fa41392dcc81746562f0d3f2624ec51528450a337be02739d046dd9062e0bc81a4c1bcbecee7adecdb434b119ad708aab07acf017

  • memory/328-68-0x00000000057C0000-0x0000000005842000-memory.dmp

    Filesize

    520KB

  • memory/328-64-0x0000000000090000-0x0000000000122000-memory.dmp

    Filesize

    584KB

  • memory/328-69-0x0000000002000000-0x000000000203C000-memory.dmp

    Filesize

    240KB

  • memory/328-66-0x0000000000440000-0x0000000000460000-memory.dmp

    Filesize

    128KB

  • memory/332-70-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/332-75-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/332-80-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/332-78-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/332-74-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/332-73-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/332-71-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/1324-58-0x0000000075AC1000-0x0000000075AC3000-memory.dmp

    Filesize

    8KB

  • memory/1324-57-0x00000000727DD000-0x00000000727E8000-memory.dmp

    Filesize

    44KB

  • memory/1324-55-0x00000000717F1000-0x00000000717F3000-memory.dmp

    Filesize

    8KB

  • memory/1324-54-0x000000002F111000-0x000000002F114000-memory.dmp

    Filesize

    12KB

  • memory/1324-67-0x00000000727DD000-0x00000000727E8000-memory.dmp

    Filesize

    44KB

  • memory/1324-56-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1324-82-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1324-83-0x00000000727DD000-0x00000000727E8000-memory.dmp

    Filesize

    44KB