Analysis

  • max time kernel
    90s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/10/2023, 11:04

General

  • Target

    FACTURA_1324819148.js

  • Size

    3.7MB

  • MD5

    397ff04b5a64bd1f89b92819bb92e086

  • SHA1

    94dbafbf953881732757956132c93b52b1940dfe

  • SHA256

    3bdb2e4bada14fdda4b518959e9375814158b877516d2ff77ec8886a7926e28a

  • SHA512

    7ed326a43bc2438162a931e9733db98e7beec5372516e1de06dd90b0e9c23b81962b8e83a60fefe8a5c4e620a04148e10e57f8dbb1666b6c9ca951041d17fd67

  • SSDEEP

    24576:jRtZ2RUL9+dJsYsuxYSkF0TLnbwrOWOQQ65Hv3zRrqjCgQwnfAjSEF/RAHLn/dNX:CivQLeunEws8hrfUbU5

Score
10/10

Malware Config

Extracted

Family

strela

C2

193.109.85.77

Signatures

  • Strela

    An info stealer targeting mail credentials first seen in late 2022.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\FACTURA_1324819148.js
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3944
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /k copy "C:\Users\Admin\AppData\Local\Temp\FACTURA_1324819148.js" "C:\Users\Admin\AppData\Local\Temp\\farmossified.bat" && "C:\Users\Admin\AppData\Local\Temp\\farmossified.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1512
      • C:\Windows\system32\findstr.exe
        findstr /V pestcalculator ""C:\Users\Admin\AppData\Local\Temp\\farmossified.bat""
        3⤵
          PID:2376
        • C:\Windows\system32\certutil.exe
          certutil -f -decode festivewaggish mournpastoral.dll
          3⤵
            PID:4900
          • C:\Windows\system32\regsvr32.exe
            regsvr32 mournpastoral.dll
            3⤵
            • Loads dropped DLL
            PID:2000

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\farmossified.bat

        Filesize

        3.7MB

        MD5

        397ff04b5a64bd1f89b92819bb92e086

        SHA1

        94dbafbf953881732757956132c93b52b1940dfe

        SHA256

        3bdb2e4bada14fdda4b518959e9375814158b877516d2ff77ec8886a7926e28a

        SHA512

        7ed326a43bc2438162a931e9733db98e7beec5372516e1de06dd90b0e9c23b81962b8e83a60fefe8a5c4e620a04148e10e57f8dbb1666b6c9ca951041d17fd67

      • C:\Users\Admin\AppData\Local\Temp\farmossified.bat

        Filesize

        3.7MB

        MD5

        397ff04b5a64bd1f89b92819bb92e086

        SHA1

        94dbafbf953881732757956132c93b52b1940dfe

        SHA256

        3bdb2e4bada14fdda4b518959e9375814158b877516d2ff77ec8886a7926e28a

        SHA512

        7ed326a43bc2438162a931e9733db98e7beec5372516e1de06dd90b0e9c23b81962b8e83a60fefe8a5c4e620a04148e10e57f8dbb1666b6c9ca951041d17fd67

      • C:\Users\Admin\AppData\Local\Temp\festivewaggish

        Filesize

        3.6MB

        MD5

        341f3b9ea1746dff428bbc568ea0b6f5

        SHA1

        d52dd921199ce7d5a95632dfc768bf4aa19c209c

        SHA256

        5258b99c488332b011fcb6157de260a9e7fe439e05821e6995f795fb40f86067

        SHA512

        694c402e9314c270a83f33f20ca478367e22de927edded69643e35c3ea968b75f8710549a9c2162a075dde05b8aa5f460fce507b740e12e061f0926eb05d229f

      • C:\Users\Admin\AppData\Local\Temp\mournpastoral.dll

        Filesize

        2.7MB

        MD5

        db4a7c58c2087a38447e198fb999c0f0

        SHA1

        ac9d1a3f574073c050ddb3afdcf6863c553f3579

        SHA256

        5c1508f5353265929def3af0f093bd9580f7589f63b196bce37cf5bcd3073c8f

        SHA512

        08ca1c58e709474c9240ff45f2a31f06b6fbc8d8d3f7d1ad6d9983a352717309c86a171dbb07bfcdb21a28c657cf21582c1a630b9604a977f5a34e6222981425

      • C:\Users\Admin\AppData\Local\Temp\mournpastoral.dll

        Filesize

        2.7MB

        MD5

        db4a7c58c2087a38447e198fb999c0f0

        SHA1

        ac9d1a3f574073c050ddb3afdcf6863c553f3579

        SHA256

        5c1508f5353265929def3af0f093bd9580f7589f63b196bce37cf5bcd3073c8f

        SHA512

        08ca1c58e709474c9240ff45f2a31f06b6fbc8d8d3f7d1ad6d9983a352717309c86a171dbb07bfcdb21a28c657cf21582c1a630b9604a977f5a34e6222981425

      • memory/2000-5375-0x000000006D7C0000-0x000000006DA77000-memory.dmp

        Filesize

        2.7MB

      • memory/2000-5374-0x0000000000560000-0x0000000000581000-memory.dmp

        Filesize

        132KB