Analysis

  • max time kernel
    143s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    16-12-2024 16:43

General

  • Target

    d490f432985a964e5442320f634b2cfd3aff7f32df02001abb308b7592b6a58b.exe

  • Size

    186KB

  • MD5

    4d9297b248ed13ac52436ef04511e986

  • SHA1

    3116c6d61588c105f45aac1955d2c97c13fdbc62

  • SHA256

    d490f432985a964e5442320f634b2cfd3aff7f32df02001abb308b7592b6a58b

  • SHA512

    6d8b8dd0ab65aeafab0de40d62a84a8f10933ec68721c9364be617de750040e55c6a8c83a03d347d42f674e8520a298f19adc883324bbedeb2b4a6c3e367f66b

  • SSDEEP

    3072:VkQXln7jRj2swOUpjv8ChQeG5CVjH5f6x:yQXlXRjLwOU2CvJx

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.

  • Tofsee family
  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • 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 8 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d490f432985a964e5442320f634b2cfd3aff7f32df02001abb308b7592b6a58b.exe
    "C:\Users\Admin\AppData\Local\Temp\d490f432985a964e5442320f634b2cfd3aff7f32df02001abb308b7592b6a58b.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2408
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bkrbpxqt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2148
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jorbjpgf.exe" C:\Windows\SysWOW64\bkrbpxqt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2356
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create bkrbpxqt binPath= "C:\Windows\SysWOW64\bkrbpxqt\jorbjpgf.exe /d\"C:\Users\Admin\AppData\Local\Temp\d490f432985a964e5442320f634b2cfd3aff7f32df02001abb308b7592b6a58b.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2940
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description bkrbpxqt "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1988
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start bkrbpxqt
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2760
    • 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:2880
  • C:\Windows\SysWOW64\bkrbpxqt\jorbjpgf.exe
    C:\Windows\SysWOW64\bkrbpxqt\jorbjpgf.exe /d"C:\Users\Admin\AppData\Local\Temp\d490f432985a964e5442320f634b2cfd3aff7f32df02001abb308b7592b6a58b.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2892
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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:2872

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.5MB

    MD5

    1889118e00f036362f107649df7a0380

    SHA1

    e17910e467f32b5b1d299df65559106c9b3def6d

    SHA256

    4b66a735e9b4a927a8a7978cc90f9147d82f25f0c2ef91479af3fa42a589890d

    SHA512

    3c17c8b66642077c5ff4e41b6b4b27c5749229b3e843df90ecb18388cdb1ccc1a334bd7ce13a17d17a8671a29e09b10911702ebc56e4a8a2d2d5c0fae1a12898

  • memory/2408-1-0x0000000000980000-0x0000000000A80000-memory.dmp

    Filesize

    1024KB

  • memory/2408-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2408-2-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/2408-7-0x0000000000400000-0x000000000081A000-memory.dmp

    Filesize

    4.1MB

  • memory/2408-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2408-8-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/2872-51-0x00000000054A0000-0x00000000058AB000-memory.dmp

    Filesize

    4.0MB

  • memory/2872-46-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2872-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2872-30-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2872-23-0x0000000001960000-0x0000000001B6F000-memory.dmp

    Filesize

    2.1MB

  • memory/2872-24-0x00000000000A0000-0x00000000000A6000-memory.dmp

    Filesize

    24KB

  • memory/2872-27-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-20-0x0000000001960000-0x0000000001B6F000-memory.dmp

    Filesize

    2.1MB

  • memory/2872-54-0x00000000054A0000-0x00000000058AB000-memory.dmp

    Filesize

    4.0MB

  • memory/2872-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2872-55-0x0000000000530000-0x0000000000537000-memory.dmp

    Filesize

    28KB

  • memory/2872-50-0x00000000002C0000-0x00000000002C5000-memory.dmp

    Filesize

    20KB

  • memory/2872-47-0x00000000002C0000-0x00000000002C5000-memory.dmp

    Filesize

    20KB

  • memory/2872-14-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2872-45-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-44-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-43-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-42-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-41-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-40-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-39-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-38-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-37-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-36-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-35-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-34-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-33-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-32-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2872-31-0x00000000000F0000-0x0000000000100000-memory.dmp

    Filesize

    64KB

  • memory/2892-16-0x0000000000400000-0x000000000081A000-memory.dmp

    Filesize

    4.1MB