Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-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.

  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\foufdsk.exe
    "C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3900
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xpxwluop\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:800
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\odvchfkc.exe" C:\Windows\SysWOW64\xpxwluop\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4532
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create xpxwluop binPath= "C:\Windows\SysWOW64\xpxwluop\odvchfkc.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:1588
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description xpxwluop "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2212
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start xpxwluop
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2220
    • 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\xpxwluop\odvchfkc.exe
    C:\Windows\SysWOW64\xpxwluop\odvchfkc.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:164
    • 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:4468

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.6MB

    MD5

    020717455202d42c3d7c767a8c039f96

    SHA1

    9cb96ca7da5c9ed9d90e6c8d2b59aa420639e045

    SHA256

    0bca1534966bb300f56805e63bdcf8aa606f6d2a0155081d60cceb0a4f14163e

    SHA512

    4d6344d92640edad5b7b95b684c6756fac8a86fdc6b227c8f984e7e53edcadc2126449e15bd104ebef2e67ca4a4b2bc945eef117321b4b70e7a4ce15fa505f12

  • memory/164-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3900-2-0x00000000021F0000-0x0000000002203000-memory.dmp

    Filesize

    76KB

  • memory/3900-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3900-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3900-8-0x00000000021F0000-0x0000000002203000-memory.dmp

    Filesize

    76KB

  • memory/3900-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3900-1-0x0000000000850000-0x0000000000950000-memory.dmp

    Filesize

    1024KB

  • memory/4468-42-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-37-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-17-0x00000000006B0000-0x00000000006C5000-memory.dmp

    Filesize

    84KB

  • memory/4468-53-0x00000000089D0000-0x0000000008DDB000-memory.dmp

    Filesize

    4.0MB

  • memory/4468-54-0x0000000000800000-0x0000000000807000-memory.dmp

    Filesize

    28KB

  • memory/4468-51-0x00000000089D0000-0x0000000008DDB000-memory.dmp

    Filesize

    4.0MB

  • memory/4468-49-0x00000000007F0000-0x00000000007F5000-memory.dmp

    Filesize

    20KB

  • memory/4468-46-0x00000000007F0000-0x00000000007F5000-memory.dmp

    Filesize

    20KB

  • memory/4468-45-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-44-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-11-0x00000000006B0000-0x00000000006C5000-memory.dmp

    Filesize

    84KB

  • memory/4468-41-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-40-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-39-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-38-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-15-0x00000000006B0000-0x00000000006C5000-memory.dmp

    Filesize

    84KB

  • memory/4468-36-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-35-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-34-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-33-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-32-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-31-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-30-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-29-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-22-0x0000000004250000-0x000000000445F000-memory.dmp

    Filesize

    2.1MB

  • memory/4468-43-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-20-0x0000000004250000-0x000000000445F000-memory.dmp

    Filesize

    2.1MB

  • memory/4468-26-0x00000000006F0000-0x0000000000700000-memory.dmp

    Filesize

    64KB

  • memory/4468-23-0x00000000006E0000-0x00000000006E6000-memory.dmp

    Filesize

    24KB