Analysis

  • max time kernel
    130s
  • max time network
    50s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    03-10-2022 08:21

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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 23 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:780
  • 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:1964
    • C:\Users\Public\vbc.exe
      "C:\Users\Public\vbc.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1220
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
        "{path}"
        3⤵
          PID:380
        • 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:740

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scripting

    1
    T1064

    Exploitation for Client Execution

    1
    T1203

    Defense Evasion

    Scripting

    1
    T1064

    Modify Registry

    1
    T1112

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    1
    T1082

    Replay Monitor

    Loading Replay Monitor...

    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/740-70-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/740-80-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/740-78-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/740-76-0x000000000043779E-mapping.dmp
    • memory/740-75-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/740-74-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/740-73-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/740-71-0x0000000000400000-0x000000000043C000-memory.dmp
      Filesize

      240KB

    • memory/780-60-0x00000000723BD000-0x00000000723C8000-memory.dmp
      Filesize

      44KB

    • memory/780-54-0x000000002FEA1000-0x000000002FEA4000-memory.dmp
      Filesize

      12KB

    • memory/780-58-0x0000000076121000-0x0000000076123000-memory.dmp
      Filesize

      8KB

    • memory/780-57-0x00000000723BD000-0x00000000723C8000-memory.dmp
      Filesize

      44KB

    • memory/780-56-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/780-55-0x00000000713D1000-0x00000000713D3000-memory.dmp
      Filesize

      8KB

    • memory/1220-68-0x0000000005470000-0x00000000054F2000-memory.dmp
      Filesize

      520KB

    • memory/1220-69-0x0000000000B60000-0x0000000000B9C000-memory.dmp
      Filesize

      240KB

    • memory/1220-67-0x0000000000430000-0x0000000000450000-memory.dmp
      Filesize

      128KB

    • memory/1220-65-0x0000000000E90000-0x0000000000F22000-memory.dmp
      Filesize

      584KB

    • memory/1220-62-0x0000000000000000-mapping.dmp