Analysis

  • max time kernel
    149s
  • max time network
    75s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    23-08-2021 09:00

General

  • Target

    SO#5933772-00,xlsx.exe

  • Size

    1.0MB

  • MD5

    3dbc477725b5a88f511f1b4e3bcc38fc

  • SHA1

    a81ed8a5aed97fb6efa956e5c485f2aad8467e9f

  • SHA256

    8742189aa8e9303ed7ce67da39348d2bb6628a6c5243c6e9a968499098f42178

  • SHA512

    60de5350d98658ab152bd361e5a7fe6c5c3f294ced8067a8ea1a3e98004759723457a9e9e36a6cc01c5a35474ab4db06695111a0143972ffb0fdfe55c97da517

Malware Config

Signatures

  • A310logger

    A310 Logger is a .NET stealer/logger targeting passwords from browsers and email clients.

  • A310logger Executable 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads local data of messenger clients 2 TTPs

    Infostealers often target stored data of messaging applications, which can include saved credentials and account information.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\SO#5933772-00,xlsx.exe
    "C:\Users\Admin\AppData\Local\Temp\SO#5933772-00,xlsx.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1728
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\VqTEFYQXsiQibk" /XML "C:\Users\Admin\AppData\Local\Temp\tmpE11E.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:4012
    • C:\Users\Admin\AppData\Local\Temp\SO#5933772-00,xlsx.exe
      "C:\Users\Admin\AppData\Local\Temp\SO#5933772-00,xlsx.exe"
      2⤵
        PID:1656
      • C:\Users\Admin\AppData\Local\Temp\SO#5933772-00,xlsx.exe
        "C:\Users\Admin\AppData\Local\Temp\SO#5933772-00,xlsx.exe"
        2⤵
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1200
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\NET4\Fox.exe
          C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\NET4\Fox.exe
          3⤵
          • Executes dropped EXE
          PID:220
        • C:\Program Files (x86)\Windows Mail\WinMail.exe
          "C:\Program Files (x86)\Windows Mail\WinMail" OCInstallUserConfigOE
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2376
          • C:\Program Files\Windows Mail\WinMail.exe
            "C:\Program Files\Windows Mail\WinMail" OCInstallUserConfigOE
            4⤵
              PID:2384

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • memory/220-136-0x000000001BBF0000-0x000000001BBF2000-memory.dmp

        Filesize

        8KB

      • memory/220-134-0x0000000000EB0000-0x0000000000EB1000-memory.dmp

        Filesize

        4KB

      • memory/1200-127-0x0000000000400000-0x0000000000456000-memory.dmp

        Filesize

        344KB

      • memory/1728-120-0x0000000005970000-0x0000000005971000-memory.dmp

        Filesize

        4KB

      • memory/1728-124-0x000000000A490000-0x000000000A4F1000-memory.dmp

        Filesize

        388KB

      • memory/1728-123-0x0000000007D70000-0x0000000007E3E000-memory.dmp

        Filesize

        824KB

      • memory/1728-122-0x0000000005760000-0x0000000005C5E000-memory.dmp

        Filesize

        5.0MB

      • memory/1728-121-0x0000000005AD0000-0x0000000005AE1000-memory.dmp

        Filesize

        68KB

      • memory/1728-114-0x0000000000D40000-0x0000000000D41000-memory.dmp

        Filesize

        4KB

      • memory/1728-119-0x0000000005700000-0x0000000005701000-memory.dmp

        Filesize

        4KB

      • memory/1728-118-0x0000000005800000-0x0000000005801000-memory.dmp

        Filesize

        4KB

      • memory/1728-117-0x0000000005C60000-0x0000000005C61000-memory.dmp

        Filesize

        4KB

      • memory/1728-116-0x0000000005620000-0x0000000005621000-memory.dmp

        Filesize

        4KB