Analysis

  • max time kernel
    150s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/11/2023, 01:11

General

  • Target

    file.exe

  • Size

    221KB

  • MD5

    2488d90434caafc7d576e6e16220a772

  • SHA1

    9f72377d8cc4e561ae6172460df94b8d0f87ed9e

  • SHA256

    f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe

  • SHA512

    5ee948f1eeb8ba21cda44d781b616f96957b6f7a1951b0a4dfe6c7c881ae28d243722cf751209efa8e1e274fe392b0956ea1423ec6ed1efb7880b87e44aa5e18

  • SSDEEP

    3072:WHMfCYL/+qeVAeW5XNFJarDAJ98I2a9CZo2Y07LPd0RPGnllVP:WsfbLQIF00JWla92o2Y0foGnR

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1188
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\stxuzywk\
      2⤵
        PID:3988
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bebulnhx.exe" C:\Windows\SysWOW64\stxuzywk\
        2⤵
          PID:2248
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create stxuzywk binPath= "C:\Windows\SysWOW64\stxuzywk\bebulnhx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description stxuzywk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4592
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start stxuzywk
          2⤵
          • Launches sc.exe
          PID:2404
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:3724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1188 -s 1048
          2⤵
          • Program crash
          PID:2552
      • C:\Windows\SysWOW64\stxuzywk\bebulnhx.exe
        C:\Windows\SysWOW64\stxuzywk\bebulnhx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3312
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1844
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3312 -s 560
          2⤵
          • Program crash
          PID:4112
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 1188 -ip 1188
        1⤵
          PID:3716
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3312 -ip 3312
          1⤵
            PID:2160

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  11.0MB

                  MD5

                  aaa306e42cbb40e9937a15e0fabbd2c4

                  SHA1

                  42384f00b72eab1fdaab2e9a8d7352747489d2aa

                  SHA256

                  68f5b9f3213f9924da59c07c2b93a3028dad3a9fd2aa6f2be317ccb874e6a244

                  SHA512

                  fe128d4855f158d08e20e81db11a81504d7b724a9ad4f61261ab49442e262217442477a3272dbc79f63116ed0e3dcf5a78e7dc80fa8b3b53a343a330dabb240f

                • C:\Windows\SysWOW64\stxuzywk\bebulnhx.exe

                  Filesize

                  11.0MB

                  MD5

                  aaa306e42cbb40e9937a15e0fabbd2c4

                  SHA1

                  42384f00b72eab1fdaab2e9a8d7352747489d2aa

                  SHA256

                  68f5b9f3213f9924da59c07c2b93a3028dad3a9fd2aa6f2be317ccb874e6a244

                  SHA512

                  fe128d4855f158d08e20e81db11a81504d7b724a9ad4f61261ab49442e262217442477a3272dbc79f63116ed0e3dcf5a78e7dc80fa8b3b53a343a330dabb240f

                • memory/1188-9-0x0000000000400000-0x00000000004EA000-memory.dmp

                  Filesize

                  936KB

                • memory/1188-2-0x0000000000610000-0x0000000000623000-memory.dmp

                  Filesize

                  76KB

                • memory/1188-3-0x0000000000400000-0x00000000004EA000-memory.dmp

                  Filesize

                  936KB

                • memory/1188-1-0x0000000000630000-0x0000000000730000-memory.dmp

                  Filesize

                  1024KB

                • memory/1844-32-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-36-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-56-0x00000000033F0000-0x00000000033F7000-memory.dmp

                  Filesize

                  28KB

                • memory/1844-12-0x0000000001280000-0x0000000001295000-memory.dmp

                  Filesize

                  84KB

                • memory/1844-16-0x0000000001280000-0x0000000001295000-memory.dmp

                  Filesize

                  84KB

                • memory/1844-17-0x0000000001280000-0x0000000001295000-memory.dmp

                  Filesize

                  84KB

                • memory/1844-55-0x0000000007E40000-0x000000000824B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1844-20-0x0000000001280000-0x0000000001295000-memory.dmp

                  Filesize

                  84KB

                • memory/1844-21-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1844-24-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1844-25-0x00000000025F0000-0x00000000025F6000-memory.dmp

                  Filesize

                  24KB

                • memory/1844-28-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-31-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-33-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-52-0x0000000007E40000-0x000000000824B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1844-35-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-34-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-51-0x00000000033E0000-0x00000000033E5000-memory.dmp

                  Filesize

                  20KB

                • memory/1844-38-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-37-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-39-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-40-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-42-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-41-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-43-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-44-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-46-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-45-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-47-0x0000000003150000-0x0000000003160000-memory.dmp

                  Filesize

                  64KB

                • memory/1844-48-0x00000000033E0000-0x00000000033E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3312-10-0x0000000000DB0000-0x0000000000DC3000-memory.dmp

                  Filesize

                  76KB

                • memory/3312-8-0x0000000000640000-0x0000000000740000-memory.dmp

                  Filesize

                  1024KB

                • memory/3312-18-0x0000000000400000-0x00000000004EA000-memory.dmp

                  Filesize

                  936KB

                • memory/3312-11-0x0000000000400000-0x00000000004EA000-memory.dmp

                  Filesize

                  936KB