Analysis

  • max time kernel
    128s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231025-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:29

General

  • Target

    7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe

  • Size

    254KB

  • MD5

    02ac11d7691ed7141949fc5c03d5aae8

  • SHA1

    b122e23b4dfb29d4efedbbe7a72c75d696f8a7ac

  • SHA256

    7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee

  • SHA512

    c437f0cec3cbe5a62a650cafd0814016864c083a2df5a65000d0411b8249daec0744b7c948039a97848135a263ba183a9cb00876fbc3d22ee1e8322dfda0e55e

  • SSDEEP

    3072:M9xGAh803FPqB1HzqotaoQpxVKPk4hjw6EX7eUkpvTRSdnbr4rO/p/4CY/:w/8iYlAxVKMuELrdnbr4yG

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\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe
    "C:\Users\Admin\AppData\Local\Temp\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4912
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wryfrhvu\
      2⤵
        PID:376
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sqfngwrn.exe" C:\Windows\SysWOW64\wryfrhvu\
        2⤵
          PID:5108
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wryfrhvu binPath= "C:\Windows\SysWOW64\wryfrhvu\sqfngwrn.exe /d\"C:\Users\Admin\AppData\Local\Temp\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wryfrhvu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wryfrhvu
          2⤵
          • Launches sc.exe
          PID:4820
        • 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:1056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4912 -s 1032
          2⤵
          • Program crash
          PID:4744
      • C:\Windows\SysWOW64\wryfrhvu\sqfngwrn.exe
        C:\Windows\SysWOW64\wryfrhvu\sqfngwrn.exe /d"C:\Users\Admin\AppData\Local\Temp\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe"
        1⤵
        • Sets service image path in registry
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2004
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:3296
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2004 -s 536
          2⤵
          • Program crash
          PID:1020
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4912 -ip 4912
        1⤵
          PID:2336
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2004 -ip 2004
          1⤵
            PID:4128

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  11.8MB

                  MD5

                  a6abda696a775b04e9ceb0d6c43c4782

                  SHA1

                  f8f398ce219b60d9375989f07758a70a8f74aca7

                  SHA256

                  9073146b670c753fcfb51d5c6e112fd233bc4e3b88ec7ec6fbedcb8ae52c7153

                  SHA512

                  fe2a6fd61d1bf6d9866f6897dd25f51cd7c7e4c98c0de4b2c2018f7f2b8477d198792fefe826c311ae1b572cd476d8794116f4fa057eabd9336433898f43b929

                • C:\Windows\SysWOW64\wryfrhvu\sqfngwrn.exe

                  Filesize

                  11.8MB

                  MD5

                  a6abda696a775b04e9ceb0d6c43c4782

                  SHA1

                  f8f398ce219b60d9375989f07758a70a8f74aca7

                  SHA256

                  9073146b670c753fcfb51d5c6e112fd233bc4e3b88ec7ec6fbedcb8ae52c7153

                  SHA512

                  fe2a6fd61d1bf6d9866f6897dd25f51cd7c7e4c98c0de4b2c2018f7f2b8477d198792fefe826c311ae1b572cd476d8794116f4fa057eabd9336433898f43b929

                • memory/2004-11-0x00000000005B0000-0x00000000006B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/2004-19-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/2004-12-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/3296-33-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-35-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-60-0x0000000000850000-0x0000000000865000-memory.dmp

                  Filesize

                  84KB

                • memory/3296-56-0x0000000002BD0000-0x0000000002BD7000-memory.dmp

                  Filesize

                  28KB

                • memory/3296-13-0x0000000000850000-0x0000000000865000-memory.dmp

                  Filesize

                  84KB

                • memory/3296-16-0x0000000000850000-0x0000000000865000-memory.dmp

                  Filesize

                  84KB

                • memory/3296-17-0x0000000000850000-0x0000000000865000-memory.dmp

                  Filesize

                  84KB

                • memory/3296-18-0x0000000000850000-0x0000000000865000-memory.dmp

                  Filesize

                  84KB

                • memory/3296-55-0x0000000007640000-0x0000000007A4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3296-21-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3296-24-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3296-25-0x00000000009F0000-0x00000000009F6000-memory.dmp

                  Filesize

                  24KB

                • memory/3296-28-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-31-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-32-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-52-0x0000000007640000-0x0000000007A4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3296-34-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-51-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

                  Filesize

                  20KB

                • memory/3296-36-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-37-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-42-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-40-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-41-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-39-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-38-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-43-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-44-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-46-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-47-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-45-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

                  Filesize

                  64KB

                • memory/3296-48-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

                  Filesize

                  20KB

                • memory/4912-8-0x0000000000580000-0x0000000000593000-memory.dmp

                  Filesize

                  76KB

                • memory/4912-1-0x00000000005C0000-0x00000000006C0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4912-2-0x0000000000580000-0x0000000000593000-memory.dmp

                  Filesize

                  76KB

                • memory/4912-3-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/4912-7-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB