Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    08/09/2024, 01:35

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
  • 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 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:2724
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nhbhqwlm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2852
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uscdfbek.exe" C:\Windows\SysWOW64\nhbhqwlm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3028
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create nhbhqwlm binPath= "C:\Windows\SysWOW64\nhbhqwlm\uscdfbek.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:2880
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description nhbhqwlm "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2636
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start nhbhqwlm
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2592
    • 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:1192
  • C:\Windows\SysWOW64\nhbhqwlm\uscdfbek.exe
    C:\Windows\SysWOW64\nhbhqwlm\uscdfbek.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:2632
    • 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:2044

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    13.5MB

    MD5

    c112a5cc7a70c410750e8701522d37a3

    SHA1

    43b4e8627d0be88cdf824c233efff01dfb1e5fa1

    SHA256

    5ed4f50389ef13a81e82588676b3ab2a2136133d3b2ffb2fa89145be956a8aea

    SHA512

    705fd8dc2bc43e3b0c65bb1868c68bcbdca761890fbe37e51837d14e326e265d81d18486f1eb483785807a1dd46276ece1b4e0aced5dd4942cbeec14132298e9

  • memory/2044-38-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-45-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-23-0x0000000001D10000-0x0000000001F1F000-memory.dmp

    Filesize

    2.1MB

  • memory/2044-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2044-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2044-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2044-24-0x0000000000110000-0x0000000000116000-memory.dmp

    Filesize

    24KB

  • memory/2044-27-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-30-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-44-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2044-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2044-20-0x0000000001D10000-0x0000000001F1F000-memory.dmp

    Filesize

    2.1MB

  • memory/2044-50-0x0000000000180000-0x0000000000185000-memory.dmp

    Filesize

    20KB

  • memory/2044-51-0x0000000005830000-0x0000000005C3B000-memory.dmp

    Filesize

    4.0MB

  • memory/2044-55-0x0000000000220000-0x0000000000227000-memory.dmp

    Filesize

    28KB

  • memory/2044-54-0x0000000005830000-0x0000000005C3B000-memory.dmp

    Filesize

    4.0MB

  • memory/2044-47-0x0000000000180000-0x0000000000185000-memory.dmp

    Filesize

    20KB

  • memory/2044-31-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-46-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-32-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-43-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-42-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-41-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-40-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-39-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-33-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-37-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-36-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-35-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2044-34-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2632-13-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2724-1-0x0000000000580000-0x0000000000680000-memory.dmp

    Filesize

    1024KB

  • memory/2724-14-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2724-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2724-15-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/2724-16-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2724-2-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB