Analysis

  • max time kernel
    52s
  • max time network
    114s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    13/01/2023, 15:00

General

  • Target

    Vietcombank_Ban Sao Thanh Toan_Pdf.exe

  • Size

    23KB

  • MD5

    357dc7fc40a74f7db969a2bd89188d6d

  • SHA1

    4afed0569b36c95f96bac367232cae88eb201e64

  • SHA256

    bc6b7187bcc579a4fd0e7ffc54bb1a5fb9fa47a3d781bce55a8c4d9ba4df0139

  • SHA512

    da23f8e01dfd78874bd274ae7cca8593ca7be0c12d3de0061630e6c737cbc87433451536ed992491568221b82548eff353bc19c7e3e6383a49d3e6a0ae261c8a

  • SSDEEP

    96:P99U6k5sBsdf2XLGMRE7ng2deOFVkAwGuTFKfEPfPNAgARricsGb7kvrBzNt:Pb6KLGMWkOMAluTFCEvNesG+D

Malware Config

Extracted

Family

purecrypter

C2

http://savory.com.bd/sav/Ezxucmj.bmp

Signatures

  • PureCrypter

    PureCrypter is a .NET malware loader first seen in early 2021.

  • 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.

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:960
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:568
    • C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe
      "C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"
      2⤵
        PID:1564
      • C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe
        "C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"
        2⤵
          PID:1272
        • C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe
          "C:\Users\Admin\AppData\Local\Temp\Vietcombank_Ban Sao Thanh Toan_Pdf.exe"
          2⤵
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • outlook_office_path
          • outlook_win_path
          PID:1112

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            • memory/568-63-0x000000006E180000-0x000000006E72B000-memory.dmp

              Filesize

              5.7MB

            • memory/568-62-0x000000006E180000-0x000000006E72B000-memory.dmp

              Filesize

              5.7MB

            • memory/568-61-0x000000006E180000-0x000000006E72B000-memory.dmp

              Filesize

              5.7MB

            • memory/960-58-0x0000000005760000-0x00000000057F2000-memory.dmp

              Filesize

              584KB

            • memory/960-54-0x0000000001190000-0x000000000119C000-memory.dmp

              Filesize

              48KB

            • memory/960-57-0x0000000004B50000-0x0000000004BA2000-memory.dmp

              Filesize

              328KB

            • memory/960-56-0x0000000005BA0000-0x0000000005C7C000-memory.dmp

              Filesize

              880KB

            • memory/960-55-0x00000000757C1000-0x00000000757C3000-memory.dmp

              Filesize

              8KB

            • memory/1112-64-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB

            • memory/1112-65-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB

            • memory/1112-67-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB

            • memory/1112-68-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB

            • memory/1112-69-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB

            • memory/1112-72-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB

            • memory/1112-74-0x0000000000400000-0x0000000000430000-memory.dmp

              Filesize

              192KB