Analysis

  • max time kernel
    149s
  • 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
    04/09/2024, 01:53

General

  • Target

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380.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\8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380.exe
    "C:\Users\Admin\AppData\Local\Temp\8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4564
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\whyyoqml\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2988
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hbbtwgkw.exe" C:\Windows\SysWOW64\whyyoqml\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1676
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create whyyoqml binPath= "C:\Windows\SysWOW64\whyyoqml\hbbtwgkw.exe /d\"C:\Users\Admin\AppData\Local\Temp\8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4560
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description whyyoqml "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4164
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start whyyoqml
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3756
    • 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:3008
  • C:\Windows\SysWOW64\whyyoqml\hbbtwgkw.exe
    C:\Windows\SysWOW64\whyyoqml\hbbtwgkw.exe /d"C:\Users\Admin\AppData\Local\Temp\8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2384
    • 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:1900

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.8MB

    MD5

    0ee5eb3b1dce4f66120c32664d9e387d

    SHA1

    b08325dba7e5b07a38255145f7e888c3283ceef9

    SHA256

    62f969177714ffe49dbb437048c148a6ffe82309474e7d9d3cd6f5b93f67415c

    SHA512

    9312e29decde3509f2be330fb7e8697912c02bb40500eefb89c2bcc61c268e99a4c6bf8e40e569afd8be202180c7533fe3e08613f17cf5e1cf3c286d0b5958a0

  • memory/1900-35-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-34-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1900-54-0x0000000007980000-0x0000000007D8B000-memory.dmp

    Filesize

    4.0MB

  • memory/1900-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1900-24-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

    Filesize

    24KB

  • memory/1900-27-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-13-0x0000000000B90000-0x0000000000BA5000-memory.dmp

    Filesize

    84KB

  • memory/1900-30-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-43-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-31-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-18-0x0000000000B90000-0x0000000000BA5000-memory.dmp

    Filesize

    84KB

  • memory/1900-40-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-51-0x0000000007980000-0x0000000007D8B000-memory.dmp

    Filesize

    4.0MB

  • memory/1900-55-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

    Filesize

    28KB

  • memory/1900-50-0x00000000021F0000-0x00000000021F5000-memory.dmp

    Filesize

    20KB

  • memory/1900-47-0x00000000021F0000-0x00000000021F5000-memory.dmp

    Filesize

    20KB

  • memory/1900-46-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-32-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-44-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-17-0x0000000000B90000-0x0000000000BA5000-memory.dmp

    Filesize

    84KB

  • memory/1900-42-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-41-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-39-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-38-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-37-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-33-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-36-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/1900-45-0x0000000002160000-0x0000000002170000-memory.dmp

    Filesize

    64KB

  • memory/2384-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2384-15-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2384-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4564-1-0x0000000000740000-0x0000000000840000-memory.dmp

    Filesize

    1024KB

  • memory/4564-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4564-8-0x0000000002200000-0x0000000002213000-memory.dmp

    Filesize

    76KB

  • memory/4564-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4564-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4564-2-0x0000000002200000-0x0000000002213000-memory.dmp

    Filesize

    76KB