Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-09-2024 10:48

General

  • Target

    1fde6a683afa19f2133e204b30283a29.exe

  • Size

    13.4MB

  • MD5

    1fde6a683afa19f2133e204b30283a29

  • SHA1

    e9578506ce5e793261b8eb26344d9a1c99149586

  • SHA256

    05cd14dc475523a662dd0e48e5fa5060c1e31584a88cdf0150cdae15c0611c74

  • SHA512

    4511077c0e7604d190a66a2b5609eefabf5d5db1a9c00e423ee9963c0ac6a18abe10f2fc9de87fc9bfcf07b399c5a774778d275e656282eb8bc2a4e164b1f92a

  • SSDEEP

    12288:AkcLVukCo8F8JeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMeMc:AkkYkCoD

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.

  • 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\1fde6a683afa19f2133e204b30283a29.exe
    "C:\Users\Admin\AppData\Local\Temp\1fde6a683afa19f2133e204b30283a29.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4028
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rvmcrjsi\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2200
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rhnqxeyl.exe" C:\Windows\SysWOW64\rvmcrjsi\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5072
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rvmcrjsi binPath= "C:\Windows\SysWOW64\rvmcrjsi\rhnqxeyl.exe /d\"C:\Users\Admin\AppData\Local\Temp\1fde6a683afa19f2133e204b30283a29.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3976
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rvmcrjsi "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3752
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rvmcrjsi
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1608
    • 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:4416
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4028 -s 1048
      2⤵
      • Program crash
      PID:3304
  • C:\Windows\SysWOW64\rvmcrjsi\rhnqxeyl.exe
    C:\Windows\SysWOW64\rvmcrjsi\rhnqxeyl.exe /d"C:\Users\Admin\AppData\Local\Temp\1fde6a683afa19f2133e204b30283a29.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1052
    • 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:1856
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1052 -s 520
      2⤵
      • Program crash
      PID:1276
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1052 -ip 1052
    1⤵
      PID:4672
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4028 -ip 4028
      1⤵
        PID:4520

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.2MB

        MD5

        ae720a3706a8e5901e149204627eef43

        SHA1

        94a966e08e94b603efd063ebf4cd2db69700a31b

        SHA256

        54bb24fdfa803aa63164b6afac2214f4ee25288d9c8a743b28506d3d2e116a89

        SHA512

        43afe259086de0dec69daa240f5a3a684073eaa943301443ac695a5a522b6c63d95311bb7cd3db5b485b0a6fda6644b4ecb9783360dad61f3c3db5dfccb56275

      • memory/1052-10-0x0000000000400000-0x0000000002C6C000-memory.dmp

        Filesize

        40.4MB

      • memory/1856-41-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-31-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-8-0x0000000000A40000-0x0000000000A55000-memory.dmp

        Filesize

        84KB

      • memory/1856-39-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-21-0x0000000001DE0000-0x0000000001DE6000-memory.dmp

        Filesize

        24KB

      • memory/1856-38-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-28-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-14-0x0000000000A40000-0x0000000000A55000-memory.dmp

        Filesize

        84KB

      • memory/1856-15-0x0000000000A40000-0x0000000000A55000-memory.dmp

        Filesize

        84KB

      • memory/1856-40-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-52-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

        Filesize

        28KB

      • memory/1856-48-0x0000000007880000-0x0000000007C8B000-memory.dmp

        Filesize

        4.0MB

      • memory/1856-47-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/1856-44-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/1856-43-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-42-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-18-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/1856-51-0x0000000007880000-0x0000000007C8B000-memory.dmp

        Filesize

        4.0MB

      • memory/1856-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/1856-37-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-36-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-35-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-34-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-33-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-32-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-24-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-30-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-29-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/1856-27-0x0000000001DF0000-0x0000000001E00000-memory.dmp

        Filesize

        64KB

      • memory/4028-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4028-2-0x0000000002DF0000-0x0000000002E03000-memory.dmp

        Filesize

        76KB

      • memory/4028-13-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4028-11-0x0000000000400000-0x0000000002C6C000-memory.dmp

        Filesize

        40.4MB

      • memory/4028-1-0x0000000002F50000-0x0000000003050000-memory.dmp

        Filesize

        1024KB

      • memory/4028-12-0x0000000002DF0000-0x0000000002E03000-memory.dmp

        Filesize

        76KB