Analysis

  • max time kernel
    147s
  • max time network
    152s
  • 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

    foufdsk.exe

  • Size

    11.2MB

  • MD5

    3482cbbb23d7548633dde35f128ea40a

  • SHA1

    b8cba7389b8e195b30ceb2e1a2b1d1fd6129adbd

  • SHA256

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380

  • SHA512

    db334c6aae52045ff3ce7597f172cce21f5a3a61a85b8dd4c5517eac649b60e429df968e1538c99080449d0ebfb5d8e917cb43bfa105e27d0a790ca2463748c7

  • SSDEEP

    6144:Oc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:O1OZDisvwdaxO0PuG1R4CWs

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\foufdsk.exe
    "C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\npxlaijh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2708
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jqxapdwg.exe" C:\Windows\SysWOW64\npxlaijh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1876
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create npxlaijh binPath= "C:\Windows\SysWOW64\npxlaijh\jqxapdwg.exe /d\"C:\Users\Admin\AppData\Local\Temp\foufdsk.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2076
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description npxlaijh "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1332
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start npxlaijh
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3228
    • 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:3984
  • C:\Windows\SysWOW64\npxlaijh\jqxapdwg.exe
    C:\Windows\SysWOW64\npxlaijh\jqxapdwg.exe /d"C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3368
    • 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:4100

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    14.9MB

    MD5

    01bb7db6fb951a7547b7c51003b8d59c

    SHA1

    f9dadcf65fac2c9dab054cdc214147830b5a8bfa

    SHA256

    c9a70c1251bbcc19485c6a15a66ab2179eefdb320b22143aa438ef31c9a14b48

    SHA512

    a828936ecb9c3cdb39b6508306f84a16a14a16be15460e7dbe66170bd73ab6353a5022c9a150a71cae92f0fc99cb653c70bc057fba91ed95210073eaa246a900

  • memory/2592-6-0x00007FF816DD0000-0x00007FF816FC5000-memory.dmp

    Filesize

    2.0MB

  • memory/2592-5-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2592-1-0x00007FF816DD0000-0x00007FF816FC5000-memory.dmp

    Filesize

    2.0MB

  • memory/3368-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3368-8-0x00007FF816DD0000-0x00007FF816FC5000-memory.dmp

    Filesize

    2.0MB

  • memory/4100-37-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-32-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-13-0x0000000000890000-0x00000000008A5000-memory.dmp

    Filesize

    84KB

  • memory/4100-50-0x00000000029F0000-0x00000000029F7000-memory.dmp

    Filesize

    28KB

  • memory/4100-49-0x0000000007440000-0x000000000784B000-memory.dmp

    Filesize

    4.0MB

  • memory/4100-45-0x00000000029E0000-0x00000000029E5000-memory.dmp

    Filesize

    20KB

  • memory/4100-42-0x00000000029E0000-0x00000000029E5000-memory.dmp

    Filesize

    20KB

  • memory/4100-41-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-39-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-38-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-9-0x0000000000890000-0x00000000008A5000-memory.dmp

    Filesize

    84KB

  • memory/4100-36-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-35-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-34-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-33-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-12-0x0000000000890000-0x00000000008A5000-memory.dmp

    Filesize

    84KB

  • memory/4100-31-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-29-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-28-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-27-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-26-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-25-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-22-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-19-0x0000000001BF0000-0x0000000001BF6000-memory.dmp

    Filesize

    24KB

  • memory/4100-18-0x0000000002400000-0x000000000260F000-memory.dmp

    Filesize

    2.1MB

  • memory/4100-47-0x0000000007440000-0x000000000784B000-memory.dmp

    Filesize

    4.0MB

  • memory/4100-40-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-30-0x0000000002750000-0x0000000002760000-memory.dmp

    Filesize

    64KB

  • memory/4100-16-0x0000000002400000-0x000000000260F000-memory.dmp

    Filesize

    2.1MB