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Analysis

  • max time kernel
    57s
  • max time network
    32s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    20/04/2023, 10:11

General

  • Target

    175.xls

  • Size

    1.1MB

  • MD5

    4985d88abcec551ec55f1cbd62fee464

  • SHA1

    59ca04cbc3ba18bea8aa9f5bf42f77650076063d

  • SHA256

    854a52693609fa9e77cc388d175429f1d4dff68fdcd69ca17a754d7583cf962d

  • SHA512

    b105f9666470effeebb3ccc3ab043953aaa0c7c6dba6804586b93c74dcd64ff4b82e685b5532dcbcd0a1e94ed702f9338220d73b241321d0e36d9ff983a28532

  • SSDEEP

    24576:Zu9V+muDLwBk0ZDLwBk5iCtsIc2y7czeftNA3v1J:ZuN+4htvfLANA/1

Malware Config

Extracted

Family

agenttesla

Credentials

Signatures

  • AgentTesla

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

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Uses the VBS compiler for execution 1 TTPs
  • Accesses Microsoft Outlook profiles 1 TTPs 3 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 use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 4 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\175.xls
    1⤵
    • Enumerates system info in registry
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:1984
  • 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:1008
    • C:\Users\Public\vbc.exe
      "C:\Users\Public\vbc.exe"
      2⤵
      • Executes dropped EXE
      • Accesses Microsoft Outlook profiles
      • Suspicious use of AdjustPrivilegeToken
      • outlook_office_path
      • outlook_win_path
      PID:1288

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Public\vbc.exe

    Filesize

    164KB

    MD5

    e583bfa8be3822408b2833b2354bbdfd

    SHA1

    2684aee17c73c68c9c62d06fa74a43380e55e327

    SHA256

    3c28f352025778417e3afc79aec19c5a25096fc69b895c4dcc6337982c6ae681

    SHA512

    1f4eaac460a5b7f5cd3cb16bf9ccd1b0965d8d611a3f35379ea432249d6148be45a740ac8fa56b2d1eb65a88035188f341e50b22082b0193c037408219a3deb0

  • C:\Users\Public\vbc.exe

    Filesize

    164KB

    MD5

    e583bfa8be3822408b2833b2354bbdfd

    SHA1

    2684aee17c73c68c9c62d06fa74a43380e55e327

    SHA256

    3c28f352025778417e3afc79aec19c5a25096fc69b895c4dcc6337982c6ae681

    SHA512

    1f4eaac460a5b7f5cd3cb16bf9ccd1b0965d8d611a3f35379ea432249d6148be45a740ac8fa56b2d1eb65a88035188f341e50b22082b0193c037408219a3deb0

  • C:\Users\Public\vbc.exe

    Filesize

    164KB

    MD5

    e583bfa8be3822408b2833b2354bbdfd

    SHA1

    2684aee17c73c68c9c62d06fa74a43380e55e327

    SHA256

    3c28f352025778417e3afc79aec19c5a25096fc69b895c4dcc6337982c6ae681

    SHA512

    1f4eaac460a5b7f5cd3cb16bf9ccd1b0965d8d611a3f35379ea432249d6148be45a740ac8fa56b2d1eb65a88035188f341e50b22082b0193c037408219a3deb0

  • \Users\Public\vbc.exe

    Filesize

    164KB

    MD5

    e583bfa8be3822408b2833b2354bbdfd

    SHA1

    2684aee17c73c68c9c62d06fa74a43380e55e327

    SHA256

    3c28f352025778417e3afc79aec19c5a25096fc69b895c4dcc6337982c6ae681

    SHA512

    1f4eaac460a5b7f5cd3cb16bf9ccd1b0965d8d611a3f35379ea432249d6148be45a740ac8fa56b2d1eb65a88035188f341e50b22082b0193c037408219a3deb0

  • memory/1288-70-0x0000000000F70000-0x0000000000FA0000-memory.dmp

    Filesize

    192KB

  • memory/1288-71-0x0000000004CF0000-0x0000000004D30000-memory.dmp

    Filesize

    256KB

  • memory/1288-72-0x0000000004CF0000-0x0000000004D30000-memory.dmp

    Filesize

    256KB

  • memory/1984-54-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB