Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    04-09-2024 10:51

General

  • Target

    b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe

  • Size

    11.6MB

  • MD5

    fed6d9f141d4ac6b3388a2c90722bd62

  • SHA1

    3480f699c94d4a520c8d92dfd2f6c84d5bd9668b

  • SHA256

    b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf

  • SHA512

    f678216084e177bc51879d697f6e4201449874ed1c6f4c41fc1cb62aecf8ed5c3ab17784c1d30c481ee99c727fe0a29cd2854bdcaf554b3da425d59b5e957719

  • SSDEEP

    6144:rc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:r1OZDisvwdaxO0PuG1R4CWs

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\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe
    "C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3028
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kjxkrlje\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2760
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ipobjjrv.exe" C:\Windows\SysWOW64\kjxkrlje\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2792
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kjxkrlje binPath= "C:\Windows\SysWOW64\kjxkrlje\ipobjjrv.exe /d\"C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2812
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kjxkrlje "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2820
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kjxkrlje
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2704
    • 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:2540
  • C:\Windows\SysWOW64\kjxkrlje\ipobjjrv.exe
    C:\Windows\SysWOW64\kjxkrlje\ipobjjrv.exe /d"C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2652
    • 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:2996

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.5MB

    MD5

    ec9ad635e3f88a966dd33e885e14f8dd

    SHA1

    21c17d7089a70c63cd53e2a2c9c15cd98a4350a9

    SHA256

    504861a1aa365131992d31ba431a55e99c39474f3f2f0bff6aa93742c9269fbb

    SHA512

    a0c88c161e2da9a12d6216b4d8193e4295e6117189b6818948cfe737968a3ae820af6c0e17ae671896b97434a8fb7ea2c7bbc070251663f5600f3100c7b60abc

  • memory/2652-17-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2996-40-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-47-0x0000000000400000-0x0000000000405000-memory.dmp

    Filesize

    20KB

  • memory/2996-46-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-38-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-37-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-16-0x0000000000090000-0x00000000000A5000-memory.dmp

    Filesize

    84KB

  • memory/2996-14-0x0000000000090000-0x00000000000A5000-memory.dmp

    Filesize

    84KB

  • memory/2996-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2996-11-0x0000000000090000-0x00000000000A5000-memory.dmp

    Filesize

    84KB

  • memory/2996-50-0x0000000000400000-0x0000000000405000-memory.dmp

    Filesize

    20KB

  • memory/2996-18-0x0000000000090000-0x00000000000A5000-memory.dmp

    Filesize

    84KB

  • memory/2996-23-0x00000000018C0000-0x0000000001ACF000-memory.dmp

    Filesize

    2.1MB

  • memory/2996-27-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-24-0x00000000001E0000-0x00000000001E6000-memory.dmp

    Filesize

    24KB

  • memory/2996-20-0x00000000018C0000-0x0000000001ACF000-memory.dmp

    Filesize

    2.1MB

  • memory/2996-30-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-51-0x00000000054B0000-0x00000000058BB000-memory.dmp

    Filesize

    4.0MB

  • memory/2996-39-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-54-0x00000000054B0000-0x00000000058BB000-memory.dmp

    Filesize

    4.0MB

  • memory/2996-55-0x0000000000410000-0x0000000000417000-memory.dmp

    Filesize

    28KB

  • memory/2996-35-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-36-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-34-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-33-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-32-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-31-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-42-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-43-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-44-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-41-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/2996-45-0x00000000001F0000-0x0000000000200000-memory.dmp

    Filesize

    64KB

  • memory/3028-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3028-8-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/3028-1-0x0000000000790000-0x0000000000890000-memory.dmp

    Filesize

    1024KB

  • memory/3028-2-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/3028-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3028-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB