Analysis

  • max time kernel
    157s
  • max time network
    191s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 22:26

General

  • Target

    84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe

  • Size

    247KB

  • MD5

    17f7e745dbc9477f5edbb4a02df91b06

  • SHA1

    896216645904844e1c012a4ce76234d0c6795f97

  • SHA256

    84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96

  • SHA512

    b36ee1060d897d5b19e0e779ca48f9a7a336bcce2700c9c6c6eb549dfd9a49174262d39655079e0704a44749e280aefcb9813da4b7ce354b2105b74f374c2e9b

  • SSDEEP

    6144:h/1BvthPXgbdbpePeXYD4JFKtFF9duXI5:J1FLfOBsee44F9duXI

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) 1 TTPs
  • Modifies Windows Firewall 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe
    "C:\Users\Admin\AppData\Local\Temp\84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1496
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\leycqyvj\
      2⤵
        PID:3516
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fmpkjddx.exe" C:\Windows\SysWOW64\leycqyvj\
        2⤵
          PID:396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create leycqyvj binPath= "C:\Windows\SysWOW64\leycqyvj\fmpkjddx.exe /d\"C:\Users\Admin\AppData\Local\Temp\84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4000
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description leycqyvj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3468
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start leycqyvj
          2⤵
          • Launches sc.exe
          PID:4520
        • 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
          PID:4324
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1496 -s 776
          2⤵
          • Program crash
          PID:1984
      • C:\Windows\SysWOW64\leycqyvj\fmpkjddx.exe
        C:\Windows\SysWOW64\leycqyvj\fmpkjddx.exe /d"C:\Users\Admin\AppData\Local\Temp\84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3060
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:3104
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3060 -s 516
          2⤵
          • Program crash
          PID:4660
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1496 -ip 1496
        1⤵
          PID:4784
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3060 -ip 3060
          1⤵
            PID:2552

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  14.4MB

                  MD5

                  7c4956a8ecf8fb4b8257bf04a523e4df

                  SHA1

                  409e58f2b208cf7e13b97724db3e6dc774b82b54

                  SHA256

                  e7814469e7f256617d44d1979ffa94e3af4e9493c15dd0f831d93750155d46a1

                  SHA512

                  69a464a2054b596f4204d2dbe1f92002a80372ea9b585ef8703e36c5d6b156bb0948db9565167e64cab9871019a3ecca3b157c1b37f5f2a83e1c1fc180187ed0

                • C:\Windows\SysWOW64\leycqyvj\fmpkjddx.exe

                  Filesize

                  14.4MB

                  MD5

                  7c4956a8ecf8fb4b8257bf04a523e4df

                  SHA1

                  409e58f2b208cf7e13b97724db3e6dc774b82b54

                  SHA256

                  e7814469e7f256617d44d1979ffa94e3af4e9493c15dd0f831d93750155d46a1

                  SHA512

                  69a464a2054b596f4204d2dbe1f92002a80372ea9b585ef8703e36c5d6b156bb0948db9565167e64cab9871019a3ecca3b157c1b37f5f2a83e1c1fc180187ed0

                • memory/1496-2-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/1496-3-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/1496-7-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/1496-9-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/1496-1-0x0000000000660000-0x0000000000760000-memory.dmp

                  Filesize

                  1024KB

                • memory/3060-18-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3060-11-0x00000000006E0000-0x00000000007E0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3060-12-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3104-34-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-38-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-16-0x00000000005D0000-0x00000000005E5000-memory.dmp

                  Filesize

                  84KB

                • memory/3104-20-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3104-23-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3104-24-0x0000000001B90000-0x0000000001B96000-memory.dmp

                  Filesize

                  24KB

                • memory/3104-27-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-30-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-31-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-32-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-13-0x00000000005D0000-0x00000000005E5000-memory.dmp

                  Filesize

                  84KB

                • memory/3104-33-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-35-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-36-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-37-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-17-0x00000000005D0000-0x00000000005E5000-memory.dmp

                  Filesize

                  84KB

                • memory/3104-39-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-40-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-41-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-42-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-43-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-44-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-46-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-45-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

                  Filesize

                  64KB

                • memory/3104-47-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

                  Filesize

                  20KB

                • memory/3104-50-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

                  Filesize

                  20KB

                • memory/3104-51-0x0000000007400000-0x000000000780B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3104-54-0x0000000007400000-0x000000000780B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3104-55-0x00000000029D0000-0x00000000029D7000-memory.dmp

                  Filesize

                  28KB

                • memory/3104-59-0x00000000005D0000-0x00000000005E5000-memory.dmp

                  Filesize

                  84KB