Analysis

  • max time kernel
    150s
  • max time network
    150s
  • 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 04:46

General

  • Target

    743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe

  • Size

    424KB

  • MD5

    f50413dcad54999b078491cda8cc97eb

  • SHA1

    b9757f71c4c63cdfdcd4b4e7e81343d2140fb97b

  • SHA256

    743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8

  • SHA512

    2ea5bd66f9365d7dfd14fe1a03234e02c17353e0f8d94316d7c15bb533444e68132f3de3b48ca366d147f0a21d4665730f00c9ae5d6981330680f9d31b03e74a

  • SSDEEP

    6144:xb7/BJsZfVjljXIJLprKi7Skl1QoRXZYsoS7ZD17T4kXwA:xXBJsZfVjlrgLND7SG1QyvH7T4k

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe
    "C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4824
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\obhzntoh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2952
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eqyvbous.exe" C:\Windows\SysWOW64\obhzntoh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3452
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create obhzntoh binPath= "C:\Windows\SysWOW64\obhzntoh\eqyvbous.exe /d\"C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5052
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description obhzntoh "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3332
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start obhzntoh
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1984
    • 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:2816
  • C:\Windows\SysWOW64\obhzntoh\eqyvbous.exe
    C:\Windows\SysWOW64\obhzntoh\eqyvbous.exe /d"C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3924
    • 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:1752

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.5MB

    MD5

    19b2c15292d878f2fa5d7a9547b35c80

    SHA1

    9d78162b266ed3a962e3ebfb756f537587c9527a

    SHA256

    75eb3e6e1dd0ec69283271abc2a307f2958ce9669156433fd0e184525c4289bb

    SHA512

    7763616252da7251370b245d6574d521a7f5327500164b95490a8441e836b36def5249023b86cda662c6992877e2cdb2243b71ecbbbec9addbff5534da57f90e

  • memory/1752-45-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-31-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-24-0x00000000025E0000-0x00000000025E6000-memory.dmp

    Filesize

    24KB

  • memory/1752-46-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-54-0x0000000007E00000-0x000000000820B000-memory.dmp

    Filesize

    4.0MB

  • memory/1752-23-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/1752-28-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-30-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-32-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-14-0x0000000001240000-0x0000000001255000-memory.dmp

    Filesize

    84KB

  • memory/1752-16-0x0000000001240000-0x0000000001255000-memory.dmp

    Filesize

    84KB

  • memory/1752-33-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-18-0x0000000001240000-0x0000000001255000-memory.dmp

    Filesize

    84KB

  • memory/1752-44-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-55-0x00000000033E0000-0x00000000033E7000-memory.dmp

    Filesize

    28KB

  • memory/1752-51-0x0000000007E00000-0x000000000820B000-memory.dmp

    Filesize

    4.0MB

  • memory/1752-50-0x00000000033D0000-0x00000000033D5000-memory.dmp

    Filesize

    20KB

  • memory/1752-47-0x00000000033D0000-0x00000000033D5000-memory.dmp

    Filesize

    20KB

  • memory/1752-21-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/1752-35-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-34-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-43-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-42-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-41-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-40-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-39-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-38-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-37-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1752-36-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/3924-17-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3924-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3924-13-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3924-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4824-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4824-2-0x00000000021F0000-0x0000000002203000-memory.dmp

    Filesize

    76KB

  • memory/4824-8-0x00000000021F0000-0x0000000002203000-memory.dmp

    Filesize

    76KB

  • memory/4824-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4824-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4824-1-0x0000000000850000-0x0000000000950000-memory.dmp

    Filesize

    1024KB