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
    05-09-2024 17:59

General

  • Target

    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe

  • Size

    399KB

  • MD5

    05b66bfebe0f44b1eb15ede797adbecd

  • SHA1

    6a9227f4cdc2cd60f594ccf4a265a39bea7bdeab

  • SHA256

    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1

  • SHA512

    1cae3a1419d42c0b131e475549731d4e37cb64e9e945451308bca32f1667ef4621ab8aeaf794f66b6a9e510c1368aa6fafdd52c6dd618e2afddaff043c877517

  • SSDEEP

    6144:0Epz3ZfyHfWBmYALwRzU3EHHxdzJF0PwVFdgiR4i/OP3A:0Epz3ZfyHfWB7o3EHRdFFwEOc48

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\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe
    "C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1984
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\frhpmtsv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1072
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rpemfvqm.exe" C:\Windows\SysWOW64\frhpmtsv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3040
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create frhpmtsv binPath= "C:\Windows\SysWOW64\frhpmtsv\rpemfvqm.exe /d\"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2976
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description frhpmtsv "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2708
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start frhpmtsv
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2752
    • 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:2900
  • C:\Windows\SysWOW64\frhpmtsv\rpemfvqm.exe
    C:\Windows\SysWOW64\frhpmtsv\rpemfvqm.exe /d"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2860
    • 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:2988

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.9MB

    MD5

    a0f23e2aee2dda9f13e06d2823b3f69e

    SHA1

    c83f181c34343c39ecfbc066c775eb527ce78d52

    SHA256

    ba5afd0fcca420b1eb53fdbe2d4ed492319bf82bf838ce5065d7e4444e91eb78

    SHA512

    cc214c53fd7ca2a21bf4a910abc1a60355d5e8247d115a086bfd7010f87a62d32864a4f4b0772002192c98f66cbcf5c8b817d2e06705842652ede7dc980c925c

  • memory/1984-14-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/1984-2-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1984-4-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/1984-1-0x0000000000290000-0x0000000000390000-memory.dmp

    Filesize

    1024KB

  • memory/1984-15-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2860-16-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/2988-51-0x00000000053F0000-0x00000000057FB000-memory.dmp

    Filesize

    4.0MB

  • memory/2988-44-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2988-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2988-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2988-20-0x00000000019C0000-0x0000000001BCF000-memory.dmp

    Filesize

    2.1MB

  • memory/2988-27-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-24-0x0000000000170000-0x0000000000176000-memory.dmp

    Filesize

    24KB

  • memory/2988-23-0x00000000019C0000-0x0000000001BCF000-memory.dmp

    Filesize

    2.1MB

  • memory/2988-32-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-50-0x0000000000510000-0x0000000000515000-memory.dmp

    Filesize

    20KB

  • memory/2988-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2988-47-0x0000000000510000-0x0000000000515000-memory.dmp

    Filesize

    20KB

  • memory/2988-46-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-45-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2988-43-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-42-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-41-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-40-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-39-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-38-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-37-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-36-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-35-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-34-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-33-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-31-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-30-0x0000000000180000-0x0000000000190000-memory.dmp

    Filesize

    64KB

  • memory/2988-55-0x00000000005E0000-0x00000000005E7000-memory.dmp

    Filesize

    28KB

  • memory/2988-54-0x00000000053F0000-0x00000000057FB000-memory.dmp

    Filesize

    4.0MB