Resubmissions

21/12/2024, 22:57

241221-2xpr2atjar 10

21/12/2024, 20:29

241221-y9xfvsyngy 10

Analysis

  • max time kernel
    147s
  • max time network
    192s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/12/2024, 20:29

General

  • Target

    038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe

  • Size

    228KB

  • MD5

    88e1648c9994c349f03f166388743f37

  • SHA1

    a4fc1edcf601aface7cc6f0c1dfad642b93e37b7

  • SHA256

    038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662

  • SHA512

    63499e1c65594925b4a531c71986bfaddfd9f45a152cca2b66ce3b310269f6e79ad9a16369b5a6a5b5792c5ea5339ddd46507455e0bbbbeb728a38408b9fec23

  • SSDEEP

    3072:qY2jOeB4iRbSRouLzYsriQw6iteLWqYCLwiUjY8MvtD23qyJuxD:qYSdMLzY8iLn4d9/UYD23nO

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Tofsee family
  • 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.

  • Program crash 2 IoCs
  • 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\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe
    "C:\Users\Admin\AppData\Local\Temp\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4876
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bcbztfjv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2844
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ekxslsfa.exe" C:\Windows\SysWOW64\bcbztfjv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2280
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create bcbztfjv binPath= "C:\Windows\SysWOW64\bcbztfjv\ekxslsfa.exe /d\"C:\Users\Admin\AppData\Local\Temp\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3052
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description bcbztfjv "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3120
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start bcbztfjv
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4792
    • 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:784
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4876 -s 1028
      2⤵
      • Program crash
      PID:952
  • C:\Windows\SysWOW64\bcbztfjv\ekxslsfa.exe
    C:\Windows\SysWOW64\bcbztfjv\ekxslsfa.exe /d"C:\Users\Admin\AppData\Local\Temp\038243614941cbef3abaa0524ae4c26cef4b8c902b0f674ebc77b04b1e035662.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1180
    • 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:708
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1180 -s 508
      2⤵
      • Program crash
      PID:1468
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4876 -ip 4876
    1⤵
      PID:388
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1180 -ip 1180
      1⤵
        PID:4932

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.0MB

        MD5

        837d0fdd4a4064ee876e9cc446955748

        SHA1

        fdbbdbea19658b5442c861a43f911714269e40df

        SHA256

        36b67c1a566fcda0ba3d73dddfe0f049619ca30fd22b655058e66e57aea8d30f

        SHA512

        1bbe6f85236e23aaa69f40515b198fec5073c195bfb8cdcaf942d848c2f464c591416aa6a98e520b9de96c2417d58e9c18082566f0b7a02609a27cab6efd6d41

      • memory/708-43-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-30-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-22-0x0000000002750000-0x0000000002756000-memory.dmp

        Filesize

        24KB

      • memory/708-18-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/708-38-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-39-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-52-0x0000000007440000-0x000000000784B000-memory.dmp

        Filesize

        4.0MB

      • memory/708-14-0x0000000000540000-0x0000000000555000-memory.dmp

        Filesize

        84KB

      • memory/708-12-0x0000000000540000-0x0000000000555000-memory.dmp

        Filesize

        84KB

      • memory/708-15-0x0000000000540000-0x0000000000555000-memory.dmp

        Filesize

        84KB

      • memory/708-21-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/708-42-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-53-0x0000000007990000-0x0000000007997000-memory.dmp

        Filesize

        28KB

      • memory/708-49-0x0000000007440000-0x000000000784B000-memory.dmp

        Filesize

        4.0MB

      • memory/708-48-0x00000000029F0000-0x00000000029F5000-memory.dmp

        Filesize

        20KB

      • memory/708-45-0x00000000029F0000-0x00000000029F5000-memory.dmp

        Filesize

        20KB

      • memory/708-44-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-25-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-28-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-40-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-29-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-37-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-36-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-35-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-33-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-34-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-32-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-31-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/708-41-0x0000000002760000-0x0000000002770000-memory.dmp

        Filesize

        64KB

      • memory/1180-16-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/1180-11-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/4876-7-0x0000000000400000-0x0000000000597000-memory.dmp

        Filesize

        1.6MB

      • memory/4876-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4876-1-0x0000000000630000-0x0000000000730000-memory.dmp

        Filesize

        1024KB

      • memory/4876-8-0x0000000002300000-0x0000000002313000-memory.dmp

        Filesize

        76KB

      • memory/4876-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4876-2-0x0000000002300000-0x0000000002313000-memory.dmp

        Filesize

        76KB