Analysis

  • max time kernel
    121s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20231130-en
  • resource tags

    arch:x64arch:x86image:win7-20231130-enlocale:en-usos:windows7-x64system
  • submitted
    08-12-2023 01:33

General

  • Target

    05b7c1f979758ed0928e004c8b086eb42b85478872b71ae7918bdec0729643a8.rtf

  • Size

    250KB

  • MD5

    11223a51b16b9da0f59f190feb0a17f6

  • SHA1

    112e82074909f413be9d8bd1c82592cb5e34c259

  • SHA256

    05b7c1f979758ed0928e004c8b086eb42b85478872b71ae7918bdec0729643a8

  • SHA512

    50ffd7915d5e640afba2a7720105c31d8664ba4b4ab269dc89f7ec806235f652399a0ab05fdfec685fec1222cf4e84cae8488e6ed2144fe32cae4c9cebbf713d

  • SSDEEP

    768:CwAbZSibMX9gRWjtwAbZSibMX9gRWjGu/wzM+MlGqItSIWBjqVlSnRVpdYW:CwAlRkwAlRGYzM+VcjilQDOW

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 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 3 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\05b7c1f979758ed0928e004c8b086eb42b85478872b71ae7918bdec0729643a8.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:3004
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:2480
    • 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:2324
      • C:\Users\Admin\AppData\Roaming\obich239461.exe
        "C:\Users\Admin\AppData\Roaming\obich239461.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2672
        • C:\Users\Admin\AppData\Roaming\obich239461.exe
          "C:\Users\Admin\AppData\Roaming\obich239461.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:3032

    Network

    MITRE ATT&CK Matrix ATT&CK v13

    Execution

    Exploitation for Client Execution

    1
    T1203

    Defense Evasion

    Modify Registry

    1
    T1112

    Credential Access

    Unsecured Credentials

    3
    T1552

    Credentials In Files

    3
    T1552.001

    Collection

    Data from Local System

    3
    T1005

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      20KB

      MD5

      7f48937dd7c55e4339a835d9842aef15

      SHA1

      cf33c997b430477566a5a7915a747e7438a0d04a

      SHA256

      9c16f9e541b92f4c368248f39c0f414a31ffca0c0a1f8f6cecc259de35cdac83

      SHA512

      84446477dd76bb8e693c49f1e005256e426d46f1facc105bb9732fe1d33c48ffc4a5e7b45f18208fd9991da5c6d9cb85694de2ce5c03750499763b2161f8fd8e

    • C:\Users\Admin\AppData\Roaming\obich239461.exe
      Filesize

      658KB

      MD5

      37d15999173d91a0a29db83c6962912d

      SHA1

      1100641ebfc52ecd245d9fd303074f8051dc8ac7

      SHA256

      2214a1536f1997efda81e136d845661f0178b44a6b104f72d7f73628e6158d08

      SHA512

      32ca859b827ccabe15fa443d4bcf62e9adfe511ec5ab3ca9983224db256dfbb9783904c6a38056b5b9b584458eed33acd4a2c1ad009aabfe1cba632dc3d9efba

    • C:\Users\Admin\AppData\Roaming\obich239461.exe
      Filesize

      658KB

      MD5

      37d15999173d91a0a29db83c6962912d

      SHA1

      1100641ebfc52ecd245d9fd303074f8051dc8ac7

      SHA256

      2214a1536f1997efda81e136d845661f0178b44a6b104f72d7f73628e6158d08

      SHA512

      32ca859b827ccabe15fa443d4bcf62e9adfe511ec5ab3ca9983224db256dfbb9783904c6a38056b5b9b584458eed33acd4a2c1ad009aabfe1cba632dc3d9efba

    • C:\Users\Admin\AppData\Roaming\obich239461.exe
      Filesize

      658KB

      MD5

      37d15999173d91a0a29db83c6962912d

      SHA1

      1100641ebfc52ecd245d9fd303074f8051dc8ac7

      SHA256

      2214a1536f1997efda81e136d845661f0178b44a6b104f72d7f73628e6158d08

      SHA512

      32ca859b827ccabe15fa443d4bcf62e9adfe511ec5ab3ca9983224db256dfbb9783904c6a38056b5b9b584458eed33acd4a2c1ad009aabfe1cba632dc3d9efba

    • C:\Users\Admin\AppData\Roaming\obich239461.exe
      Filesize

      658KB

      MD5

      37d15999173d91a0a29db83c6962912d

      SHA1

      1100641ebfc52ecd245d9fd303074f8051dc8ac7

      SHA256

      2214a1536f1997efda81e136d845661f0178b44a6b104f72d7f73628e6158d08

      SHA512

      32ca859b827ccabe15fa443d4bcf62e9adfe511ec5ab3ca9983224db256dfbb9783904c6a38056b5b9b584458eed33acd4a2c1ad009aabfe1cba632dc3d9efba

    • \Users\Admin\AppData\Roaming\obich239461.exe
      Filesize

      658KB

      MD5

      37d15999173d91a0a29db83c6962912d

      SHA1

      1100641ebfc52ecd245d9fd303074f8051dc8ac7

      SHA256

      2214a1536f1997efda81e136d845661f0178b44a6b104f72d7f73628e6158d08

      SHA512

      32ca859b827ccabe15fa443d4bcf62e9adfe511ec5ab3ca9983224db256dfbb9783904c6a38056b5b9b584458eed33acd4a2c1ad009aabfe1cba632dc3d9efba

    • memory/2672-22-0x00000000002F0000-0x000000000030A000-memory.dmp
      Filesize

      104KB

    • memory/2672-42-0x000000006AE40000-0x000000006B52E000-memory.dmp
      Filesize

      6.9MB

    • memory/2672-16-0x000000006AE40000-0x000000006B52E000-memory.dmp
      Filesize

      6.9MB

    • memory/2672-17-0x0000000004970000-0x00000000049B0000-memory.dmp
      Filesize

      256KB

    • memory/2672-15-0x0000000000BA0000-0x0000000000C4A000-memory.dmp
      Filesize

      680KB

    • memory/2672-24-0x0000000000250000-0x0000000000258000-memory.dmp
      Filesize

      32KB

    • memory/2672-25-0x0000000000310000-0x000000000031A000-memory.dmp
      Filesize

      40KB

    • memory/2672-26-0x00000000053E0000-0x000000000545E000-memory.dmp
      Filesize

      504KB

    • memory/3004-2-0x0000000070C8D000-0x0000000070C98000-memory.dmp
      Filesize

      44KB

    • memory/3004-67-0x0000000070C8D000-0x0000000070C98000-memory.dmp
      Filesize

      44KB

    • memory/3004-66-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/3004-1-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/3004-0-0x000000002F981000-0x000000002F982000-memory.dmp
      Filesize

      4KB

    • memory/3004-41-0x0000000070C8D000-0x0000000070C98000-memory.dmp
      Filesize

      44KB

    • memory/3032-27-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB

    • memory/3032-40-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB

    • memory/3032-38-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB

    • memory/3032-35-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB

    • memory/3032-33-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
      Filesize

      4KB

    • memory/3032-43-0x000000006AE40000-0x000000006B52E000-memory.dmp
      Filesize

      6.9MB

    • memory/3032-44-0x00000000020F0000-0x0000000002130000-memory.dmp
      Filesize

      256KB

    • memory/3032-45-0x000000006AE40000-0x000000006B52E000-memory.dmp
      Filesize

      6.9MB

    • memory/3032-31-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB

    • memory/3032-29-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB

    • memory/3032-28-0x0000000000400000-0x0000000000440000-memory.dmp
      Filesize

      256KB