Analysis

  • max time kernel
    78s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    01-05-2022 23:37

General

  • Target

    1b48c20c649d7e5876bcbe632bc45c75718a9ca75f0161c1da4d223fe06a6b84.exe

  • Size

    1.9MB

  • MD5

    c6057d2b61be59e1495e001637fadb3d

  • SHA1

    e35d65f9dab12340a14512a6174371a547386e41

  • SHA256

    1b48c20c649d7e5876bcbe632bc45c75718a9ca75f0161c1da4d223fe06a6b84

  • SHA512

    6d38b061600ecf9c529a816bdf00396d3d33ea670443ae956cb5b6bbe9f98efeb5f7ba1142d8b83a7e26c4454aba57e57967aa64b9d6cded381a113bddbcff43

Malware Config

Signatures

  • MassLogger

    Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.

  • MassLogger Main Payload 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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 42 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.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 54 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1b48c20c649d7e5876bcbe632bc45c75718a9ca75f0161c1da4d223fe06a6b84.exe
    "C:\Users\Admin\AppData\Local\Temp\1b48c20c649d7e5876bcbe632bc45c75718a9ca75f0161c1da4d223fe06a6b84.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4720
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn win64.exe /tr '"C:\Users\Admin\AppData\Roaming\Massive\win64.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:388
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn win64.exe /tr '"C:\Users\Admin\AppData\Roaming\Massive\win64.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:2932
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2EE.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4584
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:5044
      • C:\Users\Admin\AppData\Roaming\Massive\win64.exe
        "C:\Users\Admin\AppData\Roaming\Massive\win64.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Accesses Microsoft Outlook profiles
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • outlook_office_path
        • outlook_win_path
        PID:4404
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell" Start-Process -FilePath 'C:\Users\Admin\AppData\Local\Temp\Kucnax_winupdate.exe'
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4932
          • C:\Users\Admin\AppData\Local\Temp\Kucnax_winupdate.exe
            "C:\Users\Admin\AppData\Local\Temp\Kucnax_winupdate.exe"
            5⤵
            • Executes dropped EXE
            PID:1828
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 1828 -s 316
              6⤵
              • Program crash
              PID:5000
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1828 -ip 1828
    1⤵
      PID:4800

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\Kucnax_winupdate.exe

      Filesize

      191KB

      MD5

      e74bfa2dabe8eaeb45fcba277e5a34c7

      SHA1

      6c96a334026517dbf4f055c7f0827d9d00aba289

      SHA256

      19255f182cbb7e9293b3a1604085085b93f3c5f56a4aeaf10dc33293d56fd62d

      SHA512

      1a6da7113dda490d133b43de92ab44f625407ae5861417a57b8d8f88eb0c938c172f6f1bc9212925cd4e61c7e38658fa771f63ebb7be940e1c8747c42a6e51f8

    • C:\Users\Admin\AppData\Local\Temp\Kucnax_winupdate.exe

      Filesize

      191KB

      MD5

      e74bfa2dabe8eaeb45fcba277e5a34c7

      SHA1

      6c96a334026517dbf4f055c7f0827d9d00aba289

      SHA256

      19255f182cbb7e9293b3a1604085085b93f3c5f56a4aeaf10dc33293d56fd62d

      SHA512

      1a6da7113dda490d133b43de92ab44f625407ae5861417a57b8d8f88eb0c938c172f6f1bc9212925cd4e61c7e38658fa771f63ebb7be940e1c8747c42a6e51f8

    • C:\Users\Admin\AppData\Local\Temp\tmp2EE.tmp.bat

      Filesize

      156B

      MD5

      e916259125a79588ade532cfafeae13f

      SHA1

      879b75fbc1352c1e8b69f16f3658d05c5eb667d3

      SHA256

      79f1a5ba03fd7aaa735ea8f57c5d8386614c62ce0f32b5e6500db22bc0c41ab7

      SHA512

      164af1c5b9cebe42943d2b53b709f62928385e26b426d15c121085012c6db2d1da36dcf4239af788af64d08280dc72fa541de278ad6082645139eecf64a1c2d9

    • C:\Users\Admin\AppData\Roaming\Massive\win64.exe

      Filesize

      1.9MB

      MD5

      c6057d2b61be59e1495e001637fadb3d

      SHA1

      e35d65f9dab12340a14512a6174371a547386e41

      SHA256

      1b48c20c649d7e5876bcbe632bc45c75718a9ca75f0161c1da4d223fe06a6b84

      SHA512

      6d38b061600ecf9c529a816bdf00396d3d33ea670443ae956cb5b6bbe9f98efeb5f7ba1142d8b83a7e26c4454aba57e57967aa64b9d6cded381a113bddbcff43

    • C:\Users\Admin\AppData\Roaming\Massive\win64.exe

      Filesize

      1.9MB

      MD5

      c6057d2b61be59e1495e001637fadb3d

      SHA1

      e35d65f9dab12340a14512a6174371a547386e41

      SHA256

      1b48c20c649d7e5876bcbe632bc45c75718a9ca75f0161c1da4d223fe06a6b84

      SHA512

      6d38b061600ecf9c529a816bdf00396d3d33ea670443ae956cb5b6bbe9f98efeb5f7ba1142d8b83a7e26c4454aba57e57967aa64b9d6cded381a113bddbcff43

    • memory/1828-164-0x0000000003250000-0x0000000003255000-memory.dmp

      Filesize

      20KB

    • memory/1828-163-0x0000000077630000-0x00000000777D3000-memory.dmp

      Filesize

      1.6MB

    • memory/4404-146-0x0000000077630000-0x00000000777D3000-memory.dmp

      Filesize

      1.6MB

    • memory/4404-150-0x0000000007ED0000-0x0000000007F20000-memory.dmp

      Filesize

      320KB

    • memory/4404-152-0x0000000007EB0000-0x0000000007EBA000-memory.dmp

      Filesize

      40KB

    • memory/4404-148-0x00000000036F0000-0x0000000003860000-memory.dmp

      Filesize

      1.4MB

    • memory/4404-147-0x0000000077630000-0x00000000777D3000-memory.dmp

      Filesize

      1.6MB

    • memory/4720-130-0x0000000000B00000-0x0000000000B10000-memory.dmp

      Filesize

      64KB

    • memory/4720-136-0x0000000007BE0000-0x0000000007C46000-memory.dmp

      Filesize

      408KB

    • memory/4720-137-0x0000000007F90000-0x000000000802C000-memory.dmp

      Filesize

      624KB

    • memory/4720-131-0x0000000077630000-0x00000000777D3000-memory.dmp

      Filesize

      1.6MB

    • memory/4720-135-0x0000000006E50000-0x00000000073F4000-memory.dmp

      Filesize

      5.6MB

    • memory/4720-132-0x0000000077630000-0x00000000777D3000-memory.dmp

      Filesize

      1.6MB

    • memory/4720-133-0x0000000003660000-0x00000000037D0000-memory.dmp

      Filesize

      1.4MB

    • memory/4720-134-0x0000000006800000-0x0000000006892000-memory.dmp

      Filesize

      584KB

    • memory/4932-153-0x00000000050D0000-0x00000000056F8000-memory.dmp

      Filesize

      6.2MB

    • memory/4932-156-0x0000000005FC0000-0x0000000005FDE000-memory.dmp

      Filesize

      120KB

    • memory/4932-157-0x00000000071B0000-0x0000000007246000-memory.dmp

      Filesize

      600KB

    • memory/4932-158-0x0000000006410000-0x000000000642A000-memory.dmp

      Filesize

      104KB

    • memory/4932-159-0x0000000006510000-0x0000000006532000-memory.dmp

      Filesize

      136KB

    • memory/4932-155-0x0000000005700000-0x0000000005766000-memory.dmp

      Filesize

      408KB

    • memory/4932-154-0x0000000005030000-0x0000000005052000-memory.dmp

      Filesize

      136KB

    • memory/4932-151-0x0000000004A60000-0x0000000004A96000-memory.dmp

      Filesize

      216KB