Analysis

  • max time kernel
    150s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19-10-2022 06:32

General

  • Target

    Wssimt.exe

  • Size

    21KB

  • MD5

    fbc7a87a40a4f8b9ebc461f02b62a2f7

  • SHA1

    e9311cd1e01e75eee53867c23ab3feb9ab9185ad

  • SHA256

    08aa117c4795f93fdbee891121a2cd5e3adc46d9528967ec63ab325243fc7de2

  • SHA512

    05c3a41e76d5dad9dd43e52f49cd218dd027364ef905607eef8e12664488af5ae648a51d9c476962541ac1c91191d184db7bcca0725e7298ede4cfb1df28095d

  • SSDEEP

    192:yjjfdiDqXanIXkKQUngD33jI1MBSAitI6TxBQ:6daq4PUngpFoTn

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5583812995:AAFKzjSLC2-pDvMQ8X47-80XjrRiWrDtxA/sendMessage?chat_id=5434600361

Signatures

  • BluStealer

    A Modular information stealer written in Visual Basic.

  • StormKitty

    StormKitty is an open source info stealer written in C#.

  • StormKitty payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
    "C:\Users\Admin\AppData\Local\Temp\Wssimt.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3728
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AGEAcgB0AC0AUwBsAGUAZQBwACAALQBTAGUAYwBvAG4AZABzACAAMQAwAA==
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2860
    • C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
      C:\Users\Admin\AppData\Local\Temp\Wssimt.exe
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1912
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
        3⤵
        • Accesses Microsoft Outlook profiles
        • Checks processor information in registry
        • Suspicious use of AdjustPrivilegeToken
        • outlook_office_path
        • outlook_win_path
        PID:4604

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1912-151-0x0000000000400000-0x0000000000422000-memory.dmp

    Filesize

    136KB

  • memory/1912-145-0x0000000000400000-0x0000000000422000-memory.dmp

    Filesize

    136KB

  • memory/1912-143-0x0000000000400000-0x0000000000422000-memory.dmp

    Filesize

    136KB

  • memory/2860-136-0x0000000004F00000-0x0000000005528000-memory.dmp

    Filesize

    6.2MB

  • memory/2860-137-0x00000000055A0000-0x0000000005606000-memory.dmp

    Filesize

    408KB

  • memory/2860-138-0x0000000005740000-0x00000000057A6000-memory.dmp

    Filesize

    408KB

  • memory/2860-139-0x0000000005D70000-0x0000000005D8E000-memory.dmp

    Filesize

    120KB

  • memory/2860-140-0x00000000073A0000-0x0000000007A1A000-memory.dmp

    Filesize

    6.5MB

  • memory/2860-141-0x0000000006270000-0x000000000628A000-memory.dmp

    Filesize

    104KB

  • memory/2860-135-0x0000000004790000-0x00000000047C6000-memory.dmp

    Filesize

    216KB

  • memory/3728-132-0x00000000001F0000-0x00000000001FC000-memory.dmp

    Filesize

    48KB

  • memory/3728-133-0x0000000005740000-0x0000000005762000-memory.dmp

    Filesize

    136KB

  • memory/4604-149-0x0000000000330000-0x000000000034A000-memory.dmp

    Filesize

    104KB

  • memory/4604-150-0x0000000005310000-0x00000000053AC000-memory.dmp

    Filesize

    624KB