Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-09-2024 01:47

General

  • Target

    b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe

  • Size

    11.6MB

  • MD5

    fed6d9f141d4ac6b3388a2c90722bd62

  • SHA1

    3480f699c94d4a520c8d92dfd2f6c84d5bd9668b

  • SHA256

    b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf

  • SHA512

    f678216084e177bc51879d697f6e4201449874ed1c6f4c41fc1cb62aecf8ed5c3ab17784c1d30c481ee99c727fe0a29cd2854bdcaf554b3da425d59b5e957719

  • SSDEEP

    6144:rc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:r1OZDisvwdaxO0PuG1R4CWs

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\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe
    "C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1328
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gzemqnev\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5060
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hqwhfum.exe" C:\Windows\SysWOW64\gzemqnev\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4060
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create gzemqnev binPath= "C:\Windows\SysWOW64\gzemqnev\hqwhfum.exe /d\"C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3432
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description gzemqnev "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4864
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start gzemqnev
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1480
    • 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:4616
  • C:\Windows\SysWOW64\gzemqnev\hqwhfum.exe
    C:\Windows\SysWOW64\gzemqnev\hqwhfum.exe /d"C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:756
    • 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:3168

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    14.5MB

    MD5

    b004d58f8cfe1ecd6f9eb42f724c8cb5

    SHA1

    3bbb66017dc4d1d6c2aa71acffa2062c5cee611d

    SHA256

    087136481142164a5a182b6562b1bea536d0225f8b39874237d6f255d77b0e2b

    SHA512

    03102b176519ea2f129ec1afbeb11b2add48ee4e8b981f6aaffd86f2db7a7799a9d058c27c5dd8ed9bcc730c50717f33568524710ab282c53e4f783f1790c750

  • memory/756-14-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/756-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/756-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/1328-2-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/1328-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1328-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1328-8-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/1328-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/1328-1-0x0000000000780000-0x0000000000880000-memory.dmp

    Filesize

    1024KB

  • memory/3168-46-0x0000000002BF0000-0x0000000002BF5000-memory.dmp

    Filesize

    20KB

  • memory/3168-39-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-17-0x0000000000A90000-0x0000000000AA5000-memory.dmp

    Filesize

    84KB

  • memory/3168-19-0x0000000002600000-0x000000000280F000-memory.dmp

    Filesize

    2.1MB

  • memory/3168-54-0x0000000007B90000-0x0000000007B97000-memory.dmp

    Filesize

    28KB

  • memory/3168-50-0x0000000007640000-0x0000000007A4B000-memory.dmp

    Filesize

    4.0MB

  • memory/3168-53-0x0000000007640000-0x0000000007A4B000-memory.dmp

    Filesize

    4.0MB

  • memory/3168-49-0x0000000002BF0000-0x0000000002BF5000-memory.dmp

    Filesize

    20KB

  • memory/3168-13-0x0000000000A90000-0x0000000000AA5000-memory.dmp

    Filesize

    84KB

  • memory/3168-45-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-44-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-43-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-42-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-41-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-40-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-16-0x0000000000A90000-0x0000000000AA5000-memory.dmp

    Filesize

    84KB

  • memory/3168-38-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-37-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-36-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-35-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-34-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-33-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-32-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-31-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-30-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-29-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-26-0x0000000002960000-0x0000000002970000-memory.dmp

    Filesize

    64KB

  • memory/3168-23-0x0000000002950000-0x0000000002956000-memory.dmp

    Filesize

    24KB

  • memory/3168-22-0x0000000002600000-0x000000000280F000-memory.dmp

    Filesize

    2.1MB