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Analysis

  • max time kernel
    150s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/03/2024, 08:32

General

  • Target

    76dcd11160dbe6f680c61a8e6bfb2199a6b1e63de3475ac11e01987cc2613fb6.exe

  • Size

    400KB

  • MD5

    11e20aa257ca42b9c2542ca924e1a6e8

  • SHA1

    3fdf848f8a6adabd8a22fe15867fb298db79c1e2

  • SHA256

    76dcd11160dbe6f680c61a8e6bfb2199a6b1e63de3475ac11e01987cc2613fb6

  • SHA512

    7c6b46b1e7cc29bd5168f8b9b41a9d64eb6c98fe6f95dedcf6427afe179710f784895a02557b546d97669ce9ad6e471f9d14b9d867607f21ca8e3d272095ae97

  • SSDEEP

    6144:OlcU2rm3BeTtiBlMsHTlI/sCTaldjq5oUT/U3t53s7NJ6T93kAXLO2/Oo8aILP:LU2r+YTotZCYjYNo3tdkO/OxpP

Malware Config

Extracted

Family

stealc

C2

http://185.172.128.209

Attributes
  • url_path

    /3cd2b41cbde8fc9c.php

Signatures

  • Stealc

    Stealc is an infostealer written in C++.

  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • 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 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\76dcd11160dbe6f680c61a8e6bfb2199a6b1e63de3475ac11e01987cc2613fb6.exe
    "C:\Users\Admin\AppData\Local\Temp\76dcd11160dbe6f680c61a8e6bfb2199a6b1e63de3475ac11e01987cc2613fb6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4852
    • C:\Users\Admin\AppData\Local\Temp\u3qs.0.exe
      "C:\Users\Admin\AppData\Local\Temp\u3qs.0.exe"
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:1180
    • C:\Users\Admin\AppData\Local\Temp\u3qs.1.exe
      "C:\Users\Admin\AppData\Local\Temp\u3qs.1.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2328
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2636
        • C:\Windows\SysWOW64\chcp.com
          chcp 1251
          4⤵
            PID:928
          • C:\Windows\SysWOW64\schtasks.exe
            schtasks /create /tn "MalayamaraUpdate" /tr "'C:\Users\Admin\AppData\Local\Temp\Updater.exe'" /sc minute /mo 30 /F
            4⤵
            • Creates scheduled task(s)
            PID:1908
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4852 -s 1640
        2⤵
        • Program crash
        PID:3908
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4852 -ip 4852
      1⤵
        PID:3660

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\u3qs.0.exe

        Filesize

        256KB

        MD5

        82b83e67d3fbc356a07420923abeed36

        SHA1

        4887991a4b7d243d3f343aa111027a9f4fd03ecd

        SHA256

        27d68b0754c0074f513e931700be53ba16fdcd76401bcf87149d46b5ba4e4be0

        SHA512

        8690c2d1aaf663457707f2b9cf6b0ad26af4a9a5dab2fc77f77064579ab2b4abdd45d339f02fc4f865034ec945672ce76b48ec187330ee8910bf1c1a489b0588

      • C:\Users\Admin\AppData\Local\Temp\u3qs.1.exe

        Filesize

        1.7MB

        MD5

        eee5ddcffbed16222cac0a1b4e2e466e

        SHA1

        28b40c88b8ea50b0782e2bcbb4cc0f411035f3d5

        SHA256

        2a40e5dccc7526c4982334941c90f95374460e2a816e84e724e98c4d52ae8c54

        SHA512

        8f88901f3ebd425818db09f268df19ccf8a755603f04e9481bcf02b112a84393f8a900ead77f8f971bfa33fd9fa5636b7494aaee864a0fb04e3273911a4216dc

      • C:\Users\Admin\AppData\Roaming\Temp\Task.bat

        Filesize

        128B

        MD5

        11bb3db51f701d4e42d3287f71a6a43e

        SHA1

        63a4ee82223be6a62d04bdfe40ef8ba91ae49a86

        SHA256

        6be22058abfb22b40a42fb003f86b89e204a83024c03eb82cd53e2a0a047c331

        SHA512

        907ad2c070cc1db89f43459a94d7f48985d939d749c9648b78572a266f0d3fde47813a129e9151dbf4a7d96d36f588172f57c88b8b947b56ed818d7d068abab2

      • memory/1180-61-0x0000000000890000-0x0000000000990000-memory.dmp

        Filesize

        1024KB

      • memory/1180-19-0x0000000000400000-0x000000000063B000-memory.dmp

        Filesize

        2.2MB

      • memory/1180-14-0x0000000000890000-0x0000000000990000-memory.dmp

        Filesize

        1024KB

      • memory/1180-15-0x00000000007B0000-0x00000000007D7000-memory.dmp

        Filesize

        156KB

      • memory/1180-16-0x0000000000400000-0x000000000063B000-memory.dmp

        Filesize

        2.2MB

      • memory/1180-109-0x0000000000400000-0x000000000063B000-memory.dmp

        Filesize

        2.2MB

      • memory/1180-104-0x0000000000400000-0x000000000063B000-memory.dmp

        Filesize

        2.2MB

      • memory/1180-63-0x0000000000400000-0x000000000063B000-memory.dmp

        Filesize

        2.2MB

      • memory/1180-22-0x0000000061E00000-0x0000000061EF3000-memory.dmp

        Filesize

        972KB

      • memory/1180-99-0x0000000000400000-0x000000000063B000-memory.dmp

        Filesize

        2.2MB

      • memory/2328-83-0x0000000000400000-0x0000000000930000-memory.dmp

        Filesize

        5.2MB

      • memory/2328-86-0x0000000000B00000-0x0000000000B01000-memory.dmp

        Filesize

        4KB

      • memory/2328-75-0x0000000000400000-0x0000000000930000-memory.dmp

        Filesize

        5.2MB

      • memory/2328-76-0x0000000000B00000-0x0000000000B01000-memory.dmp

        Filesize

        4KB

      • memory/4852-18-0x00000000006B0000-0x00000000007B0000-memory.dmp

        Filesize

        1024KB

      • memory/4852-80-0x0000000000400000-0x0000000000569000-memory.dmp

        Filesize

        1.4MB

      • memory/4852-2-0x00000000022D0000-0x000000000233E000-memory.dmp

        Filesize

        440KB

      • memory/4852-3-0x0000000000400000-0x0000000000569000-memory.dmp

        Filesize

        1.4MB

      • memory/4852-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

        Filesize

        1024KB

      • memory/4852-9-0x0000000000400000-0x0000000000569000-memory.dmp

        Filesize

        1.4MB

      • memory/4852-17-0x0000000000400000-0x0000000000569000-memory.dmp

        Filesize

        1.4MB