Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-09-2024 14:29

General

  • Target

    RSno9EH0K9.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.

  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe
    "C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4888
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yjeldppu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3624
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wiuzwcbp.exe" C:\Windows\SysWOW64\yjeldppu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4292
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yjeldppu binPath= "C:\Windows\SysWOW64\yjeldppu\wiuzwcbp.exe /d\"C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1268
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yjeldppu "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4128
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yjeldppu
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3720
    • 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:5032
  • C:\Windows\SysWOW64\yjeldppu\wiuzwcbp.exe
    C:\Windows\SysWOW64\yjeldppu\wiuzwcbp.exe /d"C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2204
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1984

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.9MB

    MD5

    df5a8c279eef7de9b971424dd07b733a

    SHA1

    bee8c46bced990b42d4e236b52d1062a95069a98

    SHA256

    edd397da4cc65ce524ba17141a62d311d00fac3e9dcbd5f1bc0a68e0c78024d6

    SHA512

    1676353a73e6a9881f5e9f4fb7f6d839fa11cb6cd135f1458802dd0f19fd7c5b7dbc3a0fd462109a719b203f3c623eb7d8678626fc3163ce409df290d3ca9c8d

  • memory/1984-40-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-26-0x0000000000B90000-0x0000000000B96000-memory.dmp

    Filesize

    24KB

  • memory/1984-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1984-47-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-29-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-32-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-12-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

    Filesize

    84KB

  • memory/1984-33-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-48-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-34-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-17-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

    Filesize

    84KB

  • memory/1984-18-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

    Filesize

    84KB

  • memory/1984-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1984-57-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

    Filesize

    28KB

  • memory/1984-56-0x0000000007700000-0x0000000007B0B000-memory.dmp

    Filesize

    4.0MB

  • memory/1984-53-0x0000000007700000-0x0000000007B0B000-memory.dmp

    Filesize

    4.0MB

  • memory/1984-52-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

    Filesize

    20KB

  • memory/1984-49-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

    Filesize

    20KB

  • memory/1984-35-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-36-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-41-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-45-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-44-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-43-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-42-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-46-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-37-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-39-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/1984-38-0x0000000000BF0000-0x0000000000C00000-memory.dmp

    Filesize

    64KB

  • memory/2204-15-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2204-10-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4888-1-0x0000000000440000-0x0000000000540000-memory.dmp

    Filesize

    1024KB

  • memory/4888-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4888-14-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4888-11-0x0000000002050000-0x0000000002063000-memory.dmp

    Filesize

    76KB

  • memory/4888-7-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4888-8-0x0000000000440000-0x0000000000540000-memory.dmp

    Filesize

    1024KB

  • memory/4888-2-0x0000000002050000-0x0000000002063000-memory.dmp

    Filesize

    76KB