Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    05/09/2024, 19:51

General

  • Target

    a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe

  • Size

    401KB

  • MD5

    09622c398a7e6f315f566bc7cabfec89

  • SHA1

    c3ccda11c40b396615e5facefd3bf02d03d96c7b

  • SHA256

    a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4

  • SHA512

    5a5cbe7e55df348c46d912158dd58d735c2a289122ac46da106ee41c21432f7eea6e49dee0f0a243112c050fc6aaa85a2bddbcef7a2abd3009dcfa319746102b

  • SSDEEP

    6144:x2tEWSHPfTo04jYUy85YbRE3TgVPEHmVR0p//dZgC87mw4iklA:xvWSHPfTo04jSGYVE3hG0p/lZDsg

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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe
    "C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1456
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yzvtjsp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1192
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sietogem.exe" C:\Windows\SysWOW64\yzvtjsp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2712
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yzvtjsp binPath= "C:\Windows\SysWOW64\yzvtjsp\sietogem.exe /d\"C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3024
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yzvtjsp "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2772
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yzvtjsp
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2744
    • 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:2672
  • C:\Windows\SysWOW64\yzvtjsp\sietogem.exe
    C:\Windows\SysWOW64\yzvtjsp\sietogem.exe /d"C:\Users\Admin\AppData\Local\Temp\a30fdfa60f93f1d21c6817b522b4c63b52bcd4d5d186c1ff89d843d6bbfb53b4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2928
    • 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:2952

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.4MB

    MD5

    8565109608c36a327111c8b9ed29bc92

    SHA1

    7897c5df1b762d55873c8070350314ca26a94e32

    SHA256

    3ad790e5916b0002ebedda521b89932c0f82a3c5e25fcda16a7cd144218e8419

    SHA512

    2eaceb359aec9d0226a3e9e7c40bb175d9953ac3c6197bd2222f4878b77a2dc2f3c21bb5b76dd522a4587392a322c4d97451d9ecac1e367c5eb4de2e7995aceb

  • memory/1456-14-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/1456-2-0x00000000001B0000-0x00000000001C3000-memory.dmp

    Filesize

    76KB

  • memory/1456-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1456-1-0x0000000000270000-0x0000000000370000-memory.dmp

    Filesize

    1024KB

  • memory/1456-15-0x00000000001B0000-0x00000000001C3000-memory.dmp

    Filesize

    76KB

  • memory/1456-16-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2928-12-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/2952-47-0x00000000001F0000-0x00000000001F5000-memory.dmp

    Filesize

    20KB

  • memory/2952-42-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2952-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2952-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2952-20-0x00000000018D0000-0x0000000001ADF000-memory.dmp

    Filesize

    2.1MB

  • memory/2952-24-0x0000000000190000-0x0000000000196000-memory.dmp

    Filesize

    24KB

  • memory/2952-55-0x0000000000200000-0x0000000000207000-memory.dmp

    Filesize

    28KB

  • memory/2952-51-0x00000000053B0000-0x00000000057BB000-memory.dmp

    Filesize

    4.0MB

  • memory/2952-50-0x00000000001F0000-0x00000000001F5000-memory.dmp

    Filesize

    20KB

  • memory/2952-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2952-46-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-45-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-44-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-43-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2952-41-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-40-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-39-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-38-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-37-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-36-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-35-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-34-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-33-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-32-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-31-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-30-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-27-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2952-23-0x00000000018D0000-0x0000000001ADF000-memory.dmp

    Filesize

    2.1MB

  • memory/2952-54-0x00000000053B0000-0x00000000057BB000-memory.dmp

    Filesize

    4.0MB