Analysis

  • max time kernel
    303s
  • max time network
    310s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-01-2024 13:28

General

  • Target

    build.exe

  • Size

    1.6MB

  • MD5

    15eba7d0774bde08d568decf06d12bea

  • SHA1

    353a759556e0763fb3929b4e7832ec921f4dccf8

  • SHA256

    c024b744939bf56b0b8ace99b765be45985d9942b4bf8141eeebd723ab30f095

  • SHA512

    cd1ffa0f2c1180548b33da9738f1e39a1e5e2ea7a5f6cd7c17a5b8bc0f298c9184a311ed012c0e407df7fbadc85b6332b83016efeebf761091fedecb2c8ef741

  • SSDEEP

    49152:/kTq24GjdGSiqkqXfd+/9AqYanieKdsx:/1EjdGSiqkqXf0FLYW

Malware Config

Extracted

Family

stealerium

C2

https://discord.com/api/webhooks/1195358238842044506/G9asg_ROS67f76luy2HcmQaqPL-g8wQe7Wq2rI7i-9xFGjH8kRD3cQ_zRKvuxI_PU_Hw

Signatures

  • Stealerium

    An open source info stealer written in C# first seen in May 2022.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\build.exe
    "C:\Users\Admin\AppData\Local\Temp\build.exe"
    1⤵
    • Accesses Microsoft Outlook profiles
    • Checks processor information in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    • outlook_office_path
    • outlook_win_path
    PID:5108
    • C:\Windows\SysWOW64\cmd.exe
      "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1756
      • C:\Windows\SysWOW64\chcp.com
        chcp 65001
        3⤵
          PID:4416
        • C:\Windows\SysWOW64\netsh.exe
          netsh wlan show profile
          3⤵
            PID:8
          • C:\Windows\SysWOW64\findstr.exe
            findstr All
            3⤵
              PID:1212
          • C:\Windows\SysWOW64\cmd.exe
            "cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4796
            • C:\Windows\SysWOW64\chcp.com
              chcp 65001
              3⤵
                PID:1244
              • C:\Windows\SysWOW64\netsh.exe
                netsh wlan show networks mode=bssid
                3⤵
                  PID:3604
            • C:\Windows\system32\msiexec.exe
              C:\Windows\system32\msiexec.exe /V
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1368

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\Browsers\Firefox\Bookmarks.txt

              Filesize

              105B

              MD5

              2e9d094dda5cdc3ce6519f75943a4ff4

              SHA1

              5d989b4ac8b699781681fe75ed9ef98191a5096c

              SHA256

              c84c98bbf5e0ef9c8d0708b5d60c5bb656b7d6be5135d7f7a8d25557e08cf142

              SHA512

              d1f7eed00959e902bdb2125b91721460d3ff99f3bdfc1f2a343d4f58e8d4e5e5a06c0c6cdc0379211c94510f7c00d7a8b34fa7d0ca0c3d54cbbe878f1e9812b7

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\Directories\OneDrive.txt

              Filesize

              25B

              MD5

              966247eb3ee749e21597d73c4176bd52

              SHA1

              1e9e63c2872cef8f015d4b888eb9f81b00a35c79

              SHA256

              8ddfc481b1b6ae30815ecce8a73755862f24b3bb7fdebdbf099e037d53eb082e

              SHA512

              bd30aec68c070e86e3dec787ed26dd3d6b7d33d83e43cb2d50f9e2cff779fee4c96afbbe170443bd62874073a844beb29a69b10c72c54d7d444a8d86cfd7b5aa

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\Directories\Startup.txt

              Filesize

              24B

              MD5

              68c93da4981d591704cea7b71cebfb97

              SHA1

              fd0f8d97463cd33892cc828b4ad04e03fc014fa6

              SHA256

              889ed51f9c16a4b989bda57957d3e132b1a9c117ee84e208207f2fa208a59483

              SHA512

              63455c726b55f2d4de87147a75ff04f2daa35278183969ccf185d23707840dd84363bec20d4e8c56252196ce555001ca0e61b3f4887d27577081fdef9e946402

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\Directories\Videos.txt

              Filesize

              23B

              MD5

              1fddbf1169b6c75898b86e7e24bc7c1f

              SHA1

              d2091060cb5191ff70eb99c0088c182e80c20f8c

              SHA256

              a67aa329b7d878de61671e18cd2f4b011d11cbac67ea779818c6dafad2d70733

              SHA512

              20bfeafde7fec1753fef59de467bd4a3dd7fe627e8c44e95fe62b065a5768c4508e886ec5d898e911a28cf6365f455c9ab1ebe2386d17a76f53037f99061fd4d

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\System\Apps.txt

              Filesize

              5KB

              MD5

              53cc007ac887e79be29b4def4cdde7cc

              SHA1

              4d9dfdf742397d5dce8dd698b67e7c20f26bcd91

              SHA256

              85a6fe613d28ae1c42c840a54522935bd536ccfc3a6abfdfb1bcdb6ab1803f1f

              SHA512

              fbc5c25b4094f01e3f6e08b1e34b31e58c16fb16e001e132525aa4a3be83a8cf5f812ad2b1a8758215743d897f61901a4529570abe1568be5ee7f4380f08e98c

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\System\Process.txt

              Filesize

              4KB

              MD5

              136a2c6156b3933ee4c19ca04b245ae9

              SHA1

              974188a094653d6419525e739e352042bae558f9

              SHA256

              3fdd6eed15e0f13c2a9542d3b1b95480204b2d2a42c941c723d5a97a04580708

              SHA512

              d20e1d9ac6124604e72e60b0ddd529139dc7150bc837be5050008efd991c73fab0db28856a96a8f462b1dd1e720226562613b536f42d0a210544f2767280aec0

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\Admin@VFMDDVWB_en-US\System\ProductKey.txt

              Filesize

              29B

              MD5

              71eb5479298c7afc6d126fa04d2a9bde

              SHA1

              a9b3d5505cf9f84bb6c2be2acece53cb40075113

              SHA256

              f6cadfd4e4c25ff3b8cffe54a2af24a757a349abbf4e1142ec4c9789347fe8b3

              SHA512

              7c6687e21d31ec1d6d2eff04b07b465f875fd80df26677f1506b14158444cf55044eb6674880bd5bd44f04ff73023b26cb19b8837427a1d6655c96df52f140bd

            • C:\Users\Admin\AppData\Local\aca07b2a4dde0080b086b91261def966\msgid.dat

              Filesize

              19B

              MD5

              13eafa6775c760108643a82a03806bf6

              SHA1

              e1e859e057697cb054374c4624cbf4650a61d7d8

              SHA256

              84922455697d73da89f891e91b940683dadb554f7f9c6bb56ba09f9428f1cb2e

              SHA512

              3f680e0a3f2f56fcf6743fb49cd6f76a48084bd37acb35dd92703957fa367500d2aa7e58c65a02de96170c0dc93c3c7951fce7a635af13fa3f1f3f684f80b42a

            • memory/5108-7-0x0000000006520000-0x000000000652A000-memory.dmp

              Filesize

              40KB

            • memory/5108-4-0x0000000005640000-0x00000000056D2000-memory.dmp

              Filesize

              584KB

            • memory/5108-8-0x0000000006530000-0x0000000006538000-memory.dmp

              Filesize

              32KB

            • memory/5108-62-0x0000000006730000-0x00000000067C2000-memory.dmp

              Filesize

              584KB

            • memory/5108-65-0x0000000007590000-0x0000000007B34000-memory.dmp

              Filesize

              5.6MB

            • memory/5108-0-0x0000000000290000-0x0000000000422000-memory.dmp

              Filesize

              1.6MB

            • memory/5108-158-0x00000000027E0000-0x00000000027F0000-memory.dmp

              Filesize

              64KB

            • memory/5108-6-0x0000000005700000-0x0000000005708000-memory.dmp

              Filesize

              32KB

            • memory/5108-192-0x0000000006630000-0x00000000066AA000-memory.dmp

              Filesize

              488KB

            • memory/5108-193-0x0000000074490000-0x0000000074C40000-memory.dmp

              Filesize

              7.7MB

            • memory/5108-5-0x00000000056D0000-0x00000000056F6000-memory.dmp

              Filesize

              152KB

            • memory/5108-9-0x0000000006550000-0x000000000656E000-memory.dmp

              Filesize

              120KB

            • memory/5108-3-0x00000000027E0000-0x00000000027F0000-memory.dmp

              Filesize

              64KB

            • memory/5108-2-0x0000000004DC0000-0x0000000004E26000-memory.dmp

              Filesize

              408KB

            • memory/5108-260-0x0000000006BB0000-0x0000000006C62000-memory.dmp

              Filesize

              712KB

            • memory/5108-261-0x00000000027E0000-0x00000000027F0000-memory.dmp

              Filesize

              64KB

            • memory/5108-262-0x0000000006880000-0x00000000068A2000-memory.dmp

              Filesize

              136KB

            • memory/5108-263-0x0000000007F40000-0x0000000008294000-memory.dmp

              Filesize

              3.3MB

            • memory/5108-1-0x0000000074490000-0x0000000074C40000-memory.dmp

              Filesize

              7.7MB

            • memory/5108-271-0x00000000027E0000-0x00000000027F0000-memory.dmp

              Filesize

              64KB

            • memory/5108-272-0x0000000006FB0000-0x0000000006FBA000-memory.dmp

              Filesize

              40KB