Analysis

  • max time kernel
    136s
  • max time network
    102s
  • platform
    windows7_x64
  • resource
    win7
  • submitted
    07/07/2020, 08:41

General

  • Target

    HALKBANK.exe

  • Size

    1.9MB

  • MD5

    50c28ec3b4d36ef6d94c9ee44669d5c6

  • SHA1

    e1fa59975732f319ee3543721946c9bdbddcdd7d

  • SHA256

    8424b5a86327251f934d4e4526de3d48b942c0953a866f84de2d7bb19a5fbc04

  • SHA512

    f6bd95acce6103f8111f3b510c64de731733b0e5ccde6313ba55193667d22a0cc5f076672b25ea30fc58e50e164ab8149541dd0a79ece6e26c54d27272b6cdc1

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.bunsadokum.com
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    posta38Bunsa

Signatures

  • AgentTesla

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

  • AgentTesla Payload 13 IoCs
  • Executes dropped EXE 5 IoCs
  • Loads dropped DLL 12 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.

  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\HALKBANK.exe
    "C:\Users\Admin\AppData\Local\Temp\HALKBANK.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1424
    • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
      "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1608
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v firefoxx /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1808
        • C:\Windows\SysWOW64\reg.exe
          REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v firefoxx /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
          4⤵
          • Adds Run key to start application
          PID:1356
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1576
        • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
          "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1636
          • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
            "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
            5⤵
            • Executes dropped EXE
            • Loads dropped DLL
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1888
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1576 -s 732
          4⤵
          • Loads dropped DLL
          • Program crash
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2024
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v firefoxx /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1076
      • C:\Windows\SysWOW64\reg.exe
        REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v firefoxx /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
        3⤵
        • Adds Run key to start application
        PID:1688
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\firefoxx.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1900

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • memory/1608-7-0x0000000000400000-0x00000000004B6000-memory.dmp

          Filesize

          728KB

        • memory/1608-8-0x0000000000400000-0x00000000004B6000-memory.dmp

          Filesize

          728KB

        • memory/1608-4-0x0000000000400000-0x00000000004B6000-memory.dmp

          Filesize

          728KB

        • memory/1888-56-0x0000000000400000-0x000000000044C000-memory.dmp

          Filesize

          304KB

        • memory/1888-59-0x0000000000400000-0x000000000044C000-memory.dmp

          Filesize

          304KB

        • memory/1888-60-0x0000000000400000-0x000000000044C000-memory.dmp

          Filesize

          304KB

        • memory/2024-55-0x00000000025D0000-0x00000000025E1000-memory.dmp

          Filesize

          68KB

        • memory/2024-38-0x0000000001E20000-0x0000000001E31000-memory.dmp

          Filesize

          68KB