Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 16:57

General

  • Target

    ybyrikeu.exe

  • Size

    14.6MB

  • MD5

    ca17b0424f909bdc349dc3d80afe6e7f

  • SHA1

    e158fea33819fdbb6c106c1b0a53bff446008c54

  • SHA256

    83dc7a944be536ebd5cdda86381f84235930e36be9fea78504e0a997763ace58

  • SHA512

    f2d7c03b64e2ee0ca64d1b5dc57c2bd4eb44d9b77c9e4e4cce7a6672648b6676f9f78ba5bac79733aa5cdbeb0d6bfbe5064581fd3bf4d8dc5c9b73c795b67906

  • SSDEEP

    6144:kc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:k1OZDisvwdaxO0PuG1R4CWs

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.

  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe
    "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2472
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mbrmxkdi\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:892
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pslwwfgg.exe" C:\Windows\SysWOW64\mbrmxkdi\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2496
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create mbrmxkdi binPath= "C:\Windows\SysWOW64\mbrmxkdi\pslwwfgg.exe /d\"C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1376
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description mbrmxkdi "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2376
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start mbrmxkdi
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4860
    • 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:4004
  • C:\Windows\SysWOW64\mbrmxkdi\pslwwfgg.exe
    C:\Windows\SysWOW64\mbrmxkdi\pslwwfgg.exe /d"C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3560
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • 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:3216

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.2MB

    MD5

    3482cbbb23d7548633dde35f128ea40a

    SHA1

    b8cba7389b8e195b30ceb2e1a2b1d1fd6129adbd

    SHA256

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380

    SHA512

    db334c6aae52045ff3ce7597f172cce21f5a3a61a85b8dd4c5517eac649b60e429df968e1538c99080449d0ebfb5d8e917cb43bfa105e27d0a790ca2463748c7

  • memory/2472-1-0x0000000000750000-0x0000000000850000-memory.dmp

    Filesize

    1024KB

  • memory/2472-2-0x0000000002200000-0x0000000002213000-memory.dmp

    Filesize

    76KB

  • memory/2472-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2472-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2472-8-0x0000000002200000-0x0000000002213000-memory.dmp

    Filesize

    76KB

  • memory/2472-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3216-50-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

    Filesize

    20KB

  • memory/3216-43-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-55-0x0000000002DF0000-0x0000000002DF7000-memory.dmp

    Filesize

    28KB

  • memory/3216-14-0x0000000000A70000-0x0000000000A85000-memory.dmp

    Filesize

    84KB

  • memory/3216-16-0x0000000000A70000-0x0000000000A85000-memory.dmp

    Filesize

    84KB

  • memory/3216-17-0x0000000000A70000-0x0000000000A85000-memory.dmp

    Filesize

    84KB

  • memory/3216-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

    Filesize

    2.1MB

  • memory/3216-47-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

    Filesize

    20KB

  • memory/3216-34-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

    Filesize

    2.1MB

  • memory/3216-24-0x0000000001FF0000-0x0000000001FF6000-memory.dmp

    Filesize

    24KB

  • memory/3216-51-0x0000000007840000-0x0000000007C4B000-memory.dmp

    Filesize

    4.0MB

  • memory/3216-54-0x0000000007840000-0x0000000007C4B000-memory.dmp

    Filesize

    4.0MB

  • memory/3216-27-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-46-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-45-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-44-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-30-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-42-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-41-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-40-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-39-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-38-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-37-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-36-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-35-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-33-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-32-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3216-31-0x0000000002B50000-0x0000000002B60000-memory.dmp

    Filesize

    64KB

  • memory/3560-13-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3560-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3560-18-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3560-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB