Analysis

  • max time kernel
    299s
  • max time network
    165s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    02/03/2024, 05:00

General

  • Target
    build.exe
  • Size 1.6MB
  • Sample240302-fnf8msah75
  • SHA256 583fa788210692bc8b2cd5bd78661229278554d2d93467359adf0582de5ae589
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • stealerium

C2
  • https://discord.com/api/webhooks/1213345894246776842/7_ATY4XD-iJBgrMTHRKnjaIQFy_kOGJVfH4b103xKnMpiWtIB0E1n4Fst7kmA2PLi3_w

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 3 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.

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Modifies system certificate store 2 TTPs 4 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 28 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
    • Modifies system certificate store
    • 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:1084
    • C:\Windows\SysWOW64\cmd.exe
      "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:936
      • C:\Windows\SysWOW64\chcp.com
        chcp 65001
        3⤵
          PID:800
        • C:\Windows\SysWOW64\netsh.exe
          netsh wlan show profile
          3⤵
            PID:2228
          • C:\Windows\SysWOW64\findstr.exe
            findstr All
            3⤵
              PID:944
          • C:\Windows\SysWOW64\cmd.exe
            "cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2988
            • C:\Windows\SysWOW64\chcp.com
              chcp 65001
              3⤵
                PID:2752
              • C:\Windows\SysWOW64\netsh.exe
                netsh wlan show networks mode=bssid
                3⤵
                  PID:380
            • C:\Windows\system32\msiexec.exe
              C:\Windows\system32\msiexec.exe /V
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1680
            • C:\Windows\system32\taskmgr.exe
              "C:\Windows\system32\taskmgr.exe" /4
              1⤵
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious behavior: GetForegroundWindowSpam
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of FindShellTrayWindow
              • Suspicious use of SendNotifyMessage
              PID:544

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

                  Loading Replay Monitor...

                  Downloads

                  94308059B57B3142E455B38A6EB92015

                  • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
                  • Size 67KB
                  • SHA256 b42dc237e44cbc9a43400e7d3f9cbd406dbdefd62bfe87328f8663897d69df78
                  • MD5 SHA1 SHA512 SSDEEP

                  Bookmarks.txt

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\Admin@KXIPPCKF_en-US\Browsers\Firefox\Bookmarks.txt
                  • Size 105B
                  • SHA256 c84c98bbf5e0ef9c8d0708b5d60c5bb656b7d6be5135d7f7a8d25557e08cf142
                  • MD5 SHA1 SHA512

                  Startup.txt

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\Admin@KXIPPCKF_en-US\Directories\Startup.txt
                  • Size 24B
                  • SHA256 889ed51f9c16a4b989bda57957d3e132b1a9c117ee84e208207f2fa208a59483
                  • MD5 SHA1 SHA512

                  Videos.txt

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\Admin@KXIPPCKF_en-US\Directories\Videos.txt
                  • Size 23B
                  • SHA256 a67aa329b7d878de61671e18cd2f4b011d11cbac67ea779818c6dafad2d70733
                  • MD5 SHA1 SHA512

                  Apps.txt

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\Admin@KXIPPCKF_en-US\System\Apps.txt
                  • Size 6KB
                  • SHA256 65c27b79842187caf0752c45251cb37d8673baa93662fe5dff669a7a87b435e4
                  • MD5 SHA1 SHA512 SSDEEP

                  Debug.txt

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\Admin@KXIPPCKF_en-US\System\Debug.txt
                  • Size 293B
                  • SHA256 f1555d6f911892c83063f6819d94a4aa0642b3616d88f980a306832386ac7d42
                  • MD5 SHA1 SHA512

                  ProductKey.txt

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\Admin@KXIPPCKF_en-US\System\ProductKey.txt
                  • Size 29B
                  • SHA256 dc288491fadc4a85e71085890e3d6a7746e99a317cd5ef09a30272dfb10398c0
                  • MD5 SHA1 SHA512

                  msgid.dat

                  • Path C:\Users\Admin\AppData\Local\203191cada6360ae65067ccae55dd3b0\msgid.dat
                  • Size 19B
                  • SHA256 9a15d897d683d44205474a754704558c75e1ff2e84eaf3f24e1635e6ea5b65fc
                  • MD5 SHA1 SHA512

                  TarAB92.tmp

                  • Path C:\Users\Admin\AppData\Local\Temp\TarAB92.tmp
                  • Size 175KB
                  • SHA256 a6752b7851b591550e4625b832a393aabcc428de18d83e8593cd540f7d7cae22
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/544-248-0x0000000140000000-0x00000001405E8000-memory.dmp

                  memory/544-251-0x0000000140000000-0x00000001405E8000-memory.dmp

                  memory/544-250-0x0000000140000000-0x00000001405E8000-memory.dmp

                  memory/544-249-0x0000000140000000-0x00000001405E8000-memory.dmp

                  memory/1084-7-0x0000000000560000-0x0000000000568000-memory.dmp

                  memory/1084-0-0x0000000000E00000-0x0000000000F92000-memory.dmp

                  memory/1084-167-0x0000000005200000-0x000000000527A000-memory.dmp

                  memory/1084-6-0x00000000005B0000-0x00000000005D6000-memory.dmp

                  memory/1084-5-0x0000000000D70000-0x0000000000E02000-memory.dmp

                  memory/1084-2-0x0000000000820000-0x0000000000860000-memory.dmp

                  memory/1084-231-0x0000000006BA0000-0x0000000006C52000-memory.dmp

                  memory/1084-234-0x0000000074700000-0x0000000074DEE000-memory.dmp

                  memory/1084-235-0x0000000000820000-0x0000000000860000-memory.dmp

                  memory/1084-46-0x0000000000780000-0x0000000000788000-memory.dmp

                  memory/1084-247-0x0000000000820000-0x0000000000860000-memory.dmp

                  memory/1084-124-0x0000000000820000-0x0000000000860000-memory.dmp

                  memory/1084-1-0x0000000074700000-0x0000000074DEE000-memory.dmp

                  memory/1084-45-0x0000000000770000-0x000000000077A000-memory.dmp

                  memory/1084-47-0x0000000000860000-0x000000000087E000-memory.dmp

                  memory/1084-252-0x0000000000820000-0x0000000000860000-memory.dmp

                  memory/1084-253-0x0000000000820000-0x0000000000860000-memory.dmp