Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    07-09-2024 01:44

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 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.

  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
    "C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2260
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kvorfndb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2792
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hfpqsorx.exe" C:\Windows\SysWOW64\kvorfndb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2656
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kvorfndb binPath= "C:\Windows\SysWOW64\kvorfndb\hfpqsorx.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:2712
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kvorfndb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2824
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kvorfndb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2668
    • 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:2536
  • C:\Windows\SysWOW64\kvorfndb\hfpqsorx.exe
    C:\Windows\SysWOW64\kvorfndb\hfpqsorx.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:2800
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:2584

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.0MB

    MD5

    bf171befd3d38f695002d35c89c3f3ca

    SHA1

    6454a7168c5935ae0a59324848f98c049635478f

    SHA256

    c107f03b486531797242ff5faf23832f7b145e2a525bffe6fcb5c319ece52363

    SHA512

    d93fa62bf13b6fecf3e1285902b45c37728fccfee29993cd4e9a0fa68011bc0765646e35c5e94fd2453ed61405e7fbf11d93e5464fbe6a96448221e747157bed

  • memory/2260-1-0x00000000002D0000-0x00000000003D0000-memory.dmp

    Filesize

    1024KB

  • memory/2260-2-0x00000000001B0000-0x00000000001C3000-memory.dmp

    Filesize

    76KB

  • memory/2260-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2260-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2260-8-0x00000000001B0000-0x00000000001C3000-memory.dmp

    Filesize

    76KB

  • memory/2260-7-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2584-54-0x00000000057A0000-0x0000000005BAB000-memory.dmp

    Filesize

    4.0MB

  • memory/2584-46-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2584-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2584-31-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2584-20-0x0000000001D00000-0x0000000001F0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2584-27-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-24-0x00000000000A0000-0x00000000000A6000-memory.dmp

    Filesize

    24KB

  • memory/2584-23-0x0000000001D00000-0x0000000001F0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2584-30-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-14-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2584-51-0x00000000057A0000-0x0000000005BAB000-memory.dmp

    Filesize

    4.0MB

  • memory/2584-50-0x00000000000C0000-0x00000000000C5000-memory.dmp

    Filesize

    20KB

  • memory/2584-47-0x00000000000C0000-0x00000000000C5000-memory.dmp

    Filesize

    20KB

  • memory/2584-16-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2584-45-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-44-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-43-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-42-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-41-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-40-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-39-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-38-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-37-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-36-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-35-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-34-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-33-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-32-0x00000000000B0000-0x00000000000C0000-memory.dmp

    Filesize

    64KB

  • memory/2584-55-0x0000000000110000-0x0000000000117000-memory.dmp

    Filesize

    28KB

  • memory/2800-17-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB