Analysis

  • max time kernel
    145s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    25-09-2024 05:46

General

  • Target

    bfabf02b846c1cd0634fa1bf8a95e4aa.exe

  • Size

    238KB

  • MD5

    bfabf02b846c1cd0634fa1bf8a95e4aa

  • SHA1

    912bf8c8c515c98ed82f6ac94ce3517dde29fc6d

  • SHA256

    f4de268ea469d180cfe44713d1b0f5fcf8ea3270af525c6e040497b43a414e1b

  • SHA512

    464b3969a5e5ea0d7d00be5a7a606139a254ee603ad9ff30bfba1b1f70723d85312e76287e88ad7cc47a171f6f4e21723319df0f2404b68dff06e1318d9dd7ae

  • SSDEEP

    3072:EVW80fS45N6hqQLAp+b6+y9vZvTDmnCVN3Z4S4y9gkkhf3FCWs/xy/Q:1fS45N6hk+yfnrjZ4SteGw/Q

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.

  • 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
  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bfabf02b846c1cd0634fa1bf8a95e4aa.exe
    "C:\Users\Admin\AppData\Local\Temp\bfabf02b846c1cd0634fa1bf8a95e4aa.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2112
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kdieqyxx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2808
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hovynbue.exe" C:\Windows\SysWOW64\kdieqyxx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2816
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kdieqyxx binPath= "C:\Windows\SysWOW64\kdieqyxx\hovynbue.exe /d\"C:\Users\Admin\AppData\Local\Temp\bfabf02b846c1cd0634fa1bf8a95e4aa.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1856
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kdieqyxx "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2812
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kdieqyxx
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2884
    • 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:2628
  • C:\Windows\SysWOW64\kdieqyxx\hovynbue.exe
    C:\Windows\SysWOW64\kdieqyxx\hovynbue.exe /d"C:\Users\Admin\AppData\Local\Temp\bfabf02b846c1cd0634fa1bf8a95e4aa.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2780
    • 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:2640

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.2MB

    MD5

    49623e7ae881ed6158111da8adcead33

    SHA1

    85f8edc4d4ecc91663b8629a9b862899f2f8da55

    SHA256

    8ccbe67c140f8cd57f9ea6e763c3abc5ff3c6d9bde36cd45d7c7644c4f282b8e

    SHA512

    5a17370a0339e3a332bc26f960e00050b6b13851d11dd3c89545c880e2f81a2d4fbbdbfb2ec1ad1bf9dea3830d6dc7f48f3938ba4f39c830e6f6854f8c0dc093

  • memory/2112-2-0x0000000000400000-0x0000000002B5C000-memory.dmp

    Filesize

    39.4MB

  • memory/2112-3-0x0000000000400000-0x0000000002B5C000-memory.dmp

    Filesize

    39.4MB

  • memory/2112-6-0x0000000000400000-0x0000000002B5C000-memory.dmp

    Filesize

    39.4MB

  • memory/2640-40-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-38-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2640-43-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-13-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2640-15-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2640-17-0x00000000019D0000-0x0000000001BDF000-memory.dmp

    Filesize

    2.1MB

  • memory/2640-24-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-21-0x0000000000110000-0x0000000000116000-memory.dmp

    Filesize

    24KB

  • memory/2640-20-0x00000000019D0000-0x0000000001BDF000-memory.dmp

    Filesize

    2.1MB

  • memory/2640-27-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-36-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-35-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-39-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2640-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2640-37-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-34-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-41-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-33-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-32-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-31-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-30-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-29-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-28-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-42-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2640-52-0x0000000000140000-0x0000000000147000-memory.dmp

    Filesize

    28KB

  • memory/2640-51-0x00000000054A0000-0x00000000058AB000-memory.dmp

    Filesize

    4.0MB

  • memory/2640-48-0x00000000054A0000-0x00000000058AB000-memory.dmp

    Filesize

    4.0MB

  • memory/2640-47-0x0000000000130000-0x0000000000135000-memory.dmp

    Filesize

    20KB

  • memory/2640-44-0x0000000000130000-0x0000000000135000-memory.dmp

    Filesize

    20KB

  • memory/2780-14-0x0000000000400000-0x0000000002B5C000-memory.dmp

    Filesize

    39.4MB