Analysis

  • max time kernel
    148s
  • 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 17:04

General

  • Target

    knkduwqg.exe

  • Size

    11.8MB

  • MD5

    b32f61c5c47e9473cf4a0ac98e8143c1

  • SHA1

    d6de6d48a87510f4ba641785e56311a4732dcf26

  • SHA256

    2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5

  • SHA512

    cc0cc0499616d0277920597b7beb8ee0b53d99c9e8d8c827c6e2244dc9a98785a848f17368f6991d362f9b6f76cd3a1f7ebcc31e99c34097c458872336ab5c21

  • SSDEEP

    6144:9c6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:91OZDisvwdaxO0PuG1R4CWs

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\knkduwqg.exe
    "C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:672
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fathnuxu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2496
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tazmuucg.exe" C:\Windows\SysWOW64\fathnuxu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4960
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create fathnuxu binPath= "C:\Windows\SysWOW64\fathnuxu\tazmuucg.exe /d\"C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5004
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description fathnuxu "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4976
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start fathnuxu
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3268
    • 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:2984
  • C:\Windows\SysWOW64\fathnuxu\tazmuucg.exe
    C:\Windows\SysWOW64\fathnuxu\tazmuucg.exe /d"C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2016
    • 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:3964

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    11.5MB

    MD5

    f2015f957bd68e93aaa47c142120d7cc

    SHA1

    9f3731c52252bb9c8b2be04825c28af16aadd9a7

    SHA256

    e38ff96136e8b6601d7eedfc0f0644ed3f48f252d7a2cb65a73757bc54ff2a0a

    SHA512

    c8317c2068fa22a2d2508c9a69c34a39731f70557f4eb743a63e7bf47d20037dcc37d12714be1bc9a7708cccb633d432ae334f1784c2760093e6d7e04b3cb94a

  • memory/672-2-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/672-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/672-8-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/672-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/672-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/672-1-0x0000000000680000-0x0000000000780000-memory.dmp

    Filesize

    1024KB

  • memory/2016-15-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2016-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2016-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3964-45-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-38-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-18-0x0000000000E10000-0x0000000000E25000-memory.dmp

    Filesize

    84KB

  • memory/3964-47-0x00000000021E0000-0x00000000021E5000-memory.dmp

    Filesize

    20KB

  • memory/3964-51-0x0000000007A00000-0x0000000007E0B000-memory.dmp

    Filesize

    4.0MB

  • memory/3964-55-0x00000000021F0000-0x00000000021F7000-memory.dmp

    Filesize

    28KB

  • memory/3964-50-0x00000000021E0000-0x00000000021E5000-memory.dmp

    Filesize

    20KB

  • memory/3964-46-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-13-0x0000000000E10000-0x0000000000E25000-memory.dmp

    Filesize

    84KB

  • memory/3964-44-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-43-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-42-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-41-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-40-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-39-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-17-0x0000000000E10000-0x0000000000E25000-memory.dmp

    Filesize

    84KB

  • memory/3964-37-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-36-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-34-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-54-0x0000000007A00000-0x0000000007E0B000-memory.dmp

    Filesize

    4.0MB

  • memory/3964-33-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-32-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-31-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-30-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-27-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-24-0x00000000021C0000-0x00000000021C6000-memory.dmp

    Filesize

    24KB

  • memory/3964-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/3964-35-0x00000000021D0000-0x00000000021E0000-memory.dmp

    Filesize

    64KB

  • memory/3964-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB