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Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    28/03/2024, 16:38

General

  • Target

    a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe

  • Size

    404KB

  • MD5

    54762ca46c348dc6ab92e12250adbc68

  • SHA1

    aa8cafaf45d914c3a1fcb9618b1662dd83bfa3b9

  • SHA256

    a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a

  • SHA512

    92115352b14f7c6170513baba26baeff174c2ef9813919fc0fcb1d89fc1b0b0ad32daafa25cee3b832eb7c5bb63c8874744431300b6dbc8d8424b05090f099f5

  • SSDEEP

    12288:RzCZe/AA78MB6arGKFZqee8rFXUlgH4E0:R2OIMlHvl2gHF0

Malware Config

Extracted

Family

stealc

C2

http://185.172.128.209

Attributes
  • url_path

    /3cd2b41cbde8fc9c.php

Signatures

  • Stealc

    Stealc is an infostealer written in C++.

  • Downloads MZ/PE file
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 2 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of web browsers 2 TTPs

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

  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 4 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe
    "C:\Users\Admin\AppData\Local\Temp\a9816b1f5c43253c0b7af790ee87e29c8203b12bdd2dac78d59c9f4c375f629a.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4952
    • C:\Users\Admin\AppData\Local\Temp\u3tk.0.exe
      "C:\Users\Admin\AppData\Local\Temp\u3tk.0.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3488
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:5020
        • C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe
          "C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:1144
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /C ping 2.2.2.2 -n 1 -w 3000 > Nul & Del C:\Users\Admin\AppData\Local\Temp\EGCBFIEHIE.exe
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2968
            • C:\Windows\SysWOW64\PING.EXE
              ping 2.2.2.2 -n 1 -w 3000
              6⤵
              • Runs ping.exe
              PID:2468
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 2420
        3⤵
        • Program crash
        PID:3000
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 2428
        3⤵
        • Program crash
        PID:3124
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 2468
        3⤵
        • Program crash
        PID:672
    • C:\Users\Admin\AppData\Local\Temp\u3tk.1.exe
      "C:\Users\Admin\AppData\Local\Temp\u3tk.1.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1032
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3336
        • C:\Windows\SysWOW64\chcp.com
          chcp 1251
          4⤵
            PID:1216
          • C:\Windows\SysWOW64\schtasks.exe
            schtasks /create /tn "MalayamaraUpdate" /tr "'C:\Users\Admin\AppData\Local\Temp\Updater.exe'" /sc minute /mo 30 /F
            4⤵
            • Creates scheduled task(s)
            PID:4832
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4952 -s 1160
        2⤵
        • Program crash
        PID:3472
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4952 -ip 4952
      1⤵
        PID:4484
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 3488 -ip 3488
        1⤵
          PID:1540
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3488 -ip 3488
          1⤵
            PID:4880
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 400 -p 3488 -ip 3488
            1⤵
              PID:4008

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\ProgramData\Are.docx

              Filesize

              11KB

              MD5

              a33e5b189842c5867f46566bdbf7a095

              SHA1

              e1c06359f6a76da90d19e8fd95e79c832edb3196

              SHA256

              5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454

              SHA512

              f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b

            • C:\ProgramData\mozglue.dll

              Filesize

              593KB

              MD5

              c8fd9be83bc728cc04beffafc2907fe9

              SHA1

              95ab9f701e0024cedfbd312bcfe4e726744c4f2e

              SHA256

              ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

              SHA512

              fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

            • C:\ProgramData\nss3.dll

              Filesize

              2.0MB

              MD5

              1cc453cdf74f31e4d913ff9c10acdde2

              SHA1

              6e85eae544d6e965f15fa5c39700fa7202f3aafe

              SHA256

              ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

              SHA512

              dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

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

              Filesize

              106KB

              MD5

              fe380780b5c35bd6d54541791151c2be

              SHA1

              7fe3a583cf91474c733f85cebf3c857682e269e1

              SHA256

              b64a84d1f88e4e78464a1901c1cb5bbd5f00bb73203d719e64e072157a087b53

              SHA512

              ba05ba8aa13c4bc1cf98fbf6c08b021e8b19354098e0397fc8e1e5d3dcce367c1063203f24e50d0973193f6535681d0a43486e5dade5d112853b7a2fe8739b6c

            • C:\Users\Admin\AppData\Local\Temp\u3tk.0.exe

              Filesize

              259KB

              MD5

              33cb94d692d4ced59558b5aac83f25ed

              SHA1

              14347ca8832295c7145e0aa44f805ca5190f9391

              SHA256

              99c7b09f4f912134366464588c5e17d780af8e5097512e8e08a209ab677f45ea

              SHA512

              30c68a7ac843c2044df4875bfe9a26227b6c8b1a7bca6bb5534085267d97c51686362e2858d647985dc2f073a27b9a064d75187d2c617a66ff7db0ce8d177f66

            • C:\Users\Admin\AppData\Local\Temp\u3tk.1.exe

              Filesize

              1.7MB

              MD5

              eee5ddcffbed16222cac0a1b4e2e466e

              SHA1

              28b40c88b8ea50b0782e2bcbb4cc0f411035f3d5

              SHA256

              2a40e5dccc7526c4982334941c90f95374460e2a816e84e724e98c4d52ae8c54

              SHA512

              8f88901f3ebd425818db09f268df19ccf8a755603f04e9481bcf02b112a84393f8a900ead77f8f971bfa33fd9fa5636b7494aaee864a0fb04e3273911a4216dc

            • C:\Users\Admin\AppData\Roaming\Temp\Task.bat

              Filesize

              128B

              MD5

              11bb3db51f701d4e42d3287f71a6a43e

              SHA1

              63a4ee82223be6a62d04bdfe40ef8ba91ae49a86

              SHA256

              6be22058abfb22b40a42fb003f86b89e204a83024c03eb82cd53e2a0a047c331

              SHA512

              907ad2c070cc1db89f43459a94d7f48985d939d749c9648b78572a266f0d3fde47813a129e9151dbf4a7d96d36f588172f57c88b8b947b56ed818d7d068abab2

            • memory/1032-122-0x0000000000400000-0x0000000000930000-memory.dmp

              Filesize

              5.2MB

            • memory/1032-30-0x0000000001040000-0x0000000001041000-memory.dmp

              Filesize

              4KB

            • memory/1032-131-0x0000000001040000-0x0000000001041000-memory.dmp

              Filesize

              4KB

            • memory/1032-29-0x0000000000400000-0x0000000000930000-memory.dmp

              Filesize

              5.2MB

            • memory/1144-123-0x0000000000F10000-0x0000000000F30000-memory.dmp

              Filesize

              128KB

            • memory/1144-128-0x0000000071CD0000-0x0000000072481000-memory.dmp

              Filesize

              7.7MB

            • memory/1144-125-0x0000000005930000-0x0000000005940000-memory.dmp

              Filesize

              64KB

            • memory/1144-124-0x0000000071CD0000-0x0000000072481000-memory.dmp

              Filesize

              7.7MB

            • memory/3488-18-0x0000000000400000-0x0000000000AEA000-memory.dmp

              Filesize

              6.9MB

            • memory/3488-121-0x0000000000400000-0x0000000000AEA000-memory.dmp

              Filesize

              6.9MB

            • memory/3488-16-0x0000000000D00000-0x0000000000E00000-memory.dmp

              Filesize

              1024KB

            • memory/3488-17-0x0000000000CD0000-0x0000000000CF7000-memory.dmp

              Filesize

              156KB

            • memory/3488-31-0x0000000061E00000-0x0000000061EF3000-memory.dmp

              Filesize

              972KB

            • memory/4952-2-0x0000000002970000-0x00000000029DE000-memory.dmp

              Filesize

              440KB

            • memory/4952-1-0x0000000000C40000-0x0000000000D40000-memory.dmp

              Filesize

              1024KB

            • memory/4952-3-0x0000000000400000-0x0000000000B0E000-memory.dmp

              Filesize

              7.1MB

            • memory/4952-52-0x0000000000400000-0x0000000000B0E000-memory.dmp

              Filesize

              7.1MB