Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-09-2024 17:19

General

  • Target

    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe

  • Size

    213KB

  • MD5

    8e456f932787fcd0cadbb598174575b2

  • SHA1

    22b069c76b86bdb6be8cdafc78019b55c583062e

  • SHA256

    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5

  • SHA512

    cb26a33dacdcfe804bdd587ecd44b9bf1c59f357e8701fc4f5e1b04d8d8882466c7743fac51969fe8912e1197a5653986eb4a71edc35eee89051b6c98d546c9d

  • SSDEEP

    6144:MGDLD6Tj3Vyg0mwiRjaVlodEFjvn/Mq0Vdh1HQ:M+L2n3VygtzRWJjv+Vdz

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) 2 TTPs
  • Modifies Windows Firewall 2 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.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
    "C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2124
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\etwryhgx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:232
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nwcnlas.exe" C:\Windows\SysWOW64\etwryhgx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3244
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create etwryhgx binPath= "C:\Windows\SysWOW64\etwryhgx\nwcnlas.exe /d\"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2204
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description etwryhgx "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4588
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start etwryhgx
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2624
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:3108
  • C:\Windows\SysWOW64\etwryhgx\nwcnlas.exe
    C:\Windows\SysWOW64\etwryhgx\nwcnlas.exe /d"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4520
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:2452

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.1MB

    MD5

    bee8124fdb9108185b59975ea7e3cc4f

    SHA1

    a812c7f9abc4f5ad99ad6cdca29e5675d9dab85a

    SHA256

    3462a57dc730faf0d01977da3d8805b19e9958ee5ce8243261664e0f1651cfba

    SHA512

    47a301a837c29b77d9e38ff2b9012382994331c46f88e0af69b42df3ffcb4b1165041888cdf2ed3d408e1e6c44af1edf3c92b3be7e7b5cbb1431daa8e81053ca

  • memory/2124-15-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2124-2-0x0000000000590000-0x00000000005A3000-memory.dmp

    Filesize

    76KB

  • memory/2124-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2124-7-0x00000000006E0000-0x00000000007E0000-memory.dmp

    Filesize

    1024KB

  • memory/2124-10-0x0000000000590000-0x00000000005A3000-memory.dmp

    Filesize

    76KB

  • memory/2124-11-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2124-1-0x00000000006E0000-0x00000000007E0000-memory.dmp

    Filesize

    1024KB

  • memory/2452-48-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-45-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2452-40-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-17-0x0000000000D20000-0x0000000000D35000-memory.dmp

    Filesize

    84KB

  • memory/2452-18-0x0000000000D20000-0x0000000000D35000-memory.dmp

    Filesize

    84KB

  • memory/2452-57-0x0000000007B00000-0x0000000007F0B000-memory.dmp

    Filesize

    4.0MB

  • memory/2452-58-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

    Filesize

    28KB

  • memory/2452-54-0x0000000007B00000-0x0000000007F0B000-memory.dmp

    Filesize

    4.0MB

  • memory/2452-53-0x00000000023F0000-0x00000000023F5000-memory.dmp

    Filesize

    20KB

  • memory/2452-50-0x00000000023F0000-0x00000000023F5000-memory.dmp

    Filesize

    20KB

  • memory/2452-49-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2452-47-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-46-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-13-0x0000000000D20000-0x0000000000D35000-memory.dmp

    Filesize

    84KB

  • memory/2452-44-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-43-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-42-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-41-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-39-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-38-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-37-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-36-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-35-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-34-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-33-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-30-0x00000000023E0000-0x00000000023F0000-memory.dmp

    Filesize

    64KB

  • memory/2452-27-0x00000000023D0000-0x00000000023D6000-memory.dmp

    Filesize

    24KB

  • memory/4520-12-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4520-16-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4520-9-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB