Analysis

  • max time kernel
    119s
  • max time network
    130s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    13-03-2024 05:57

General

  • Target

    4b8d9718182adc5a816e871c94e893c8.rtf

  • Size

    61KB

  • MD5

    4b8d9718182adc5a816e871c94e893c8

  • SHA1

    b4738338f23c754a889f88a3de30fa7341b2de76

  • SHA256

    3b89a9f5f315f37ec110ec2e59c40e9635841115a73bb031edcbe7d059904ae2

  • SHA512

    34462edf91d8ac3bff28e1a5099e5f73329aa0d542f034a2e6d723780a356a1f9c48db5e6dbf8e45f6e21a80a3cff3ea241acac02b63ee32a5402a7e9b1a7afe

  • SSDEEP

    1536:hBJJZKasmStEcl7WT3aXStTCR1HFjaBA1YpspLCEP:hBjZ5spiTcUTIzwvpspLC+

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 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • 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.

  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Windows directory 1 IoCs
  • Office loads VBA resources, possible macro or embedded object present
  • 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 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\4b8d9718182adc5a816e871c94e893c8.rtf"
    1⤵
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1548
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:684
    • 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:2608
      • C:\Users\Admin\AppData\Roaming\NSS.exe
        "C:\Users\Admin\AppData\Roaming\NSS.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2540
        • C:\Users\Admin\AppData\Roaming\NSS.exe
          "C:\Users\Admin\AppData\Roaming\NSS.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2832

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\Microsoft\Templates\Normal.dotm

      Filesize

      20KB

      MD5

      2f75c0995f7d4db33ee83a5c5447104a

      SHA1

      3811256407a82bda6e752de61d0b9aec6ac9c2eb

      SHA256

      1211cfb38130f844b66ff87ca8a481604d8aac671eb5eebd3c2a02a3c31ce774

      SHA512

      4a777e1234c0234c2571cf26d35ba0bb03fff2a9f74fc77255ed338bbc6fced5a1e957e23eb75b24941c89574f990805c8616f81c2002199e0c0b049c7aeb4ad

    • C:\Users\Admin\AppData\Roaming\NSS.exe

      Filesize

      642KB

      MD5

      876db5122f5ecb90acc915cec4c89810

      SHA1

      4dcedd113292812c0ef832640f3e964eec73c289

      SHA256

      d04380b79524da697074a01b0af3809f881d0fb09a68364083aeb7a1be021249

      SHA512

      f2813727b0f813cad1638d58aedc03caff7c649f4da5af7ef8161c2826e0a5d9526cf30fb19d94e982dae8d66615ef5f735f691d0f23cf1a601bbc87a9eaf2b8

    • memory/1548-65-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1548-1-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1548-2-0x0000000070B8D000-0x0000000070B98000-memory.dmp

      Filesize

      44KB

    • memory/1548-45-0x0000000070B8D000-0x0000000070B98000-memory.dmp

      Filesize

      44KB

    • memory/1548-0-0x000000002F941000-0x000000002F942000-memory.dmp

      Filesize

      4KB

    • memory/2540-18-0x0000000000900000-0x0000000000940000-memory.dmp

      Filesize

      256KB

    • memory/2540-25-0x0000000000860000-0x000000000086C000-memory.dmp

      Filesize

      48KB

    • memory/2540-26-0x00000000008B0000-0x00000000008BE000-memory.dmp

      Filesize

      56KB

    • memory/2540-27-0x0000000005290000-0x0000000005312000-memory.dmp

      Filesize

      520KB

    • memory/2540-23-0x00000000004F0000-0x000000000050C000-memory.dmp

      Filesize

      112KB

    • memory/2540-43-0x000000006AD00000-0x000000006B3EE000-memory.dmp

      Filesize

      6.9MB

    • memory/2540-17-0x000000006AD00000-0x000000006B3EE000-memory.dmp

      Filesize

      6.9MB

    • memory/2540-15-0x0000000001120000-0x00000000011C6000-memory.dmp

      Filesize

      664KB

    • memory/2832-30-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB

    • memory/2832-38-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB

    • memory/2832-36-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2832-41-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB

    • memory/2832-44-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB

    • memory/2832-34-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB

    • memory/2832-46-0x000000006A470000-0x000000006AB5E000-memory.dmp

      Filesize

      6.9MB

    • memory/2832-47-0x000000006A470000-0x000000006AB5E000-memory.dmp

      Filesize

      6.9MB

    • memory/2832-32-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB

    • memory/2832-28-0x0000000000400000-0x0000000000440000-memory.dmp

      Filesize

      256KB