Analysis

  • max time kernel
    143s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-09-2024 10:01

General

  • Target

    c97280c3f5a9f5624e77be287469eb85310b777391395da12d2e66737c98d877.exe

  • Size

    213KB

  • MD5

    ee271bdebc1bcd255611d9003a2833ae

  • SHA1

    fdd6de358c491b1cf26d3a3ec1eb83467a75661c

  • SHA256

    c97280c3f5a9f5624e77be287469eb85310b777391395da12d2e66737c98d877

  • SHA512

    f711a36e4fbf367094d77ac60bf9140a0bfc4d6b620541f4771d8c332066f5823538edc3ca6d09c140b930fafc891c85293c168e6ac9065b9dea814f2f0d5dd6

  • SSDEEP

    6144:taDXnqPnz53mEBAQTcoToM4v//MRb0Vdh1JQ:t6Xq/z53mz3M4vjVdz

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.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\c97280c3f5a9f5624e77be287469eb85310b777391395da12d2e66737c98d877.exe
    "C:\Users\Admin\AppData\Local\Temp\c97280c3f5a9f5624e77be287469eb85310b777391395da12d2e66737c98d877.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3788
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ovdafsym\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2940
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wuefhdgm.exe" C:\Windows\SysWOW64\ovdafsym\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:852
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ovdafsym binPath= "C:\Windows\SysWOW64\ovdafsym\wuefhdgm.exe /d\"C:\Users\Admin\AppData\Local\Temp\c97280c3f5a9f5624e77be287469eb85310b777391395da12d2e66737c98d877.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4844
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ovdafsym "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2924
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ovdafsym
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2000
    • 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:388
  • C:\Windows\SysWOW64\ovdafsym\wuefhdgm.exe
    C:\Windows\SysWOW64\ovdafsym\wuefhdgm.exe /d"C:\Users\Admin\AppData\Local\Temp\c97280c3f5a9f5624e77be287469eb85310b777391395da12d2e66737c98d877.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1668
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1476

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.8MB

    MD5

    72c594d7d89701d822b2e7b7e4cc51da

    SHA1

    60657592483a15fa97387a9f7336c13c24960ed2

    SHA256

    5b42a6ff6bad2afdf778d57721298387242a75c19aa89b83188061232cc5d90e

    SHA512

    010d15739ddb07fcde8136a4fdf815acaf465d5a29bd4653579f100406217a006d3bebfb5db8e2dd2975adf993d133618feb8c4c9a56b331fe972d56239a916e

  • memory/1476-48-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-39-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1476-49-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-27-0x0000000002B50000-0x0000000002B56000-memory.dmp

    Filesize

    24KB

  • memory/1476-30-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-33-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-35-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-36-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-14-0x0000000000C90000-0x0000000000CA5000-memory.dmp

    Filesize

    84KB

  • memory/1476-37-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-18-0x0000000000C90000-0x0000000000CA5000-memory.dmp

    Filesize

    84KB

  • memory/1476-19-0x0000000000C90000-0x0000000000CA5000-memory.dmp

    Filesize

    84KB

  • memory/1476-47-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-57-0x0000000007840000-0x0000000007C4B000-memory.dmp

    Filesize

    4.0MB

  • memory/1476-54-0x0000000007840000-0x0000000007C4B000-memory.dmp

    Filesize

    4.0MB

  • memory/1476-53-0x0000000002DF0000-0x0000000002DF5000-memory.dmp

    Filesize

    20KB

  • memory/1476-50-0x0000000002DF0000-0x0000000002DF5000-memory.dmp

    Filesize

    20KB

  • memory/1476-26-0x0000000002800000-0x0000000002A0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1476-34-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-58-0x0000000007D90000-0x0000000007D97000-memory.dmp

    Filesize

    28KB

  • memory/1476-46-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-45-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-44-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-43-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-42-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-41-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-40-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1476-38-0x0000000002B60000-0x0000000002B70000-memory.dmp

    Filesize

    64KB

  • memory/1668-16-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/1668-13-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/1668-11-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/3788-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3788-10-0x00000000004C0000-0x00000000004D3000-memory.dmp

    Filesize

    76KB

  • memory/3788-1-0x00000000004F0000-0x00000000005F0000-memory.dmp

    Filesize

    1024KB

  • memory/3788-12-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3788-7-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/3788-8-0x00000000004F0000-0x00000000005F0000-memory.dmp

    Filesize

    1024KB

  • memory/3788-2-0x00000000004C0000-0x00000000004D3000-memory.dmp

    Filesize

    76KB