Analysis

  • max time kernel
    146s
  • max time network
    158s
  • 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, 23:33

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:3376
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bwmeqkqu\
      2⤵
        PID:3388
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybuffopp.exe" C:\Windows\SysWOW64\bwmeqkqu\
        2⤵
          PID:2156
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bwmeqkqu binPath= "C:\Windows\SysWOW64\bwmeqkqu\ybuffopp.exe /d\"C:\Users\Admin\AppData\Local\Temp\84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2188
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bwmeqkqu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bwmeqkqu
          2⤵
          • Launches sc.exe
          PID:4400
        • 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:4528
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3376 -s 1036
          2⤵
          • Program crash
          PID:548
      • C:\Windows\SysWOW64\bwmeqkqu\ybuffopp.exe
        C:\Windows\SysWOW64\bwmeqkqu\ybuffopp.exe /d"C:\Users\Admin\AppData\Local\Temp\84e5c974047a59e9c250aa8e93a28b390267eea51a38a711bc28a229bf5eba96.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1596
        • 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:4164
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1596 -s 512
          2⤵
          • Program crash
          PID:4896
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3376 -ip 3376
        1⤵
          PID:1100
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1596 -ip 1596
          1⤵
            PID:3412

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

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

                  Filesize

                  11.5MB

                  MD5

                  f2e40a4dd983451dff5ce6b5cf7d83f8

                  SHA1

                  2fa99b495113a936b56aa952b371e660d3bca2bf

                  SHA256

                  5d9d4914338db00f1c491bfbdc12e63be928bb01d9d674318876caec7fe10e40

                  SHA512

                  7654a1603ff2297a360dae269f4c7684f4617a56ea08bc4d36e7ca0153d75f882f217e7d3e3307bf65b84b4533609c4fce89a2949b47eac05550337a1909aef7

                • C:\Windows\SysWOW64\bwmeqkqu\ybuffopp.exe

                  Filesize

                  11.5MB

                  MD5

                  f2e40a4dd983451dff5ce6b5cf7d83f8

                  SHA1

                  2fa99b495113a936b56aa952b371e660d3bca2bf

                  SHA256

                  5d9d4914338db00f1c491bfbdc12e63be928bb01d9d674318876caec7fe10e40

                  SHA512

                  7654a1603ff2297a360dae269f4c7684f4617a56ea08bc4d36e7ca0153d75f882f217e7d3e3307bf65b84b4533609c4fce89a2949b47eac05550337a1909aef7

                • memory/1596-21-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/1596-13-0x0000000000820000-0x0000000000920000-memory.dmp

                  Filesize

                  1024KB

                • memory/1596-15-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3376-2-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/3376-3-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3376-6-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3376-7-0x0000000000400000-0x00000000004F1000-memory.dmp

                  Filesize

                  964KB

                • memory/3376-9-0x0000000000650000-0x0000000000750000-memory.dmp

                  Filesize

                  1024KB

                • memory/3376-10-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/3376-1-0x0000000000650000-0x0000000000750000-memory.dmp

                  Filesize

                  1024KB

                • memory/4164-34-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-40-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-18-0x00000000008C0000-0x00000000008D5000-memory.dmp

                  Filesize

                  84KB

                • memory/4164-20-0x00000000008C0000-0x00000000008D5000-memory.dmp

                  Filesize

                  84KB

                • memory/4164-23-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4164-26-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4164-27-0x0000000001D80000-0x0000000001D86000-memory.dmp

                  Filesize

                  24KB

                • memory/4164-30-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-14-0x00000000008C0000-0x00000000008D5000-memory.dmp

                  Filesize

                  84KB

                • memory/4164-35-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-36-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-33-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-37-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-38-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-39-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-19-0x00000000008C0000-0x00000000008D5000-memory.dmp

                  Filesize

                  84KB

                • memory/4164-41-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-42-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-43-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-45-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-46-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-44-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-47-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-48-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-49-0x0000000001D90000-0x0000000001DA0000-memory.dmp

                  Filesize

                  64KB

                • memory/4164-50-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

                  Filesize

                  20KB

                • memory/4164-53-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

                  Filesize

                  20KB

                • memory/4164-54-0x0000000007500000-0x000000000790B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4164-57-0x0000000007500000-0x000000000790B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4164-58-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

                  Filesize

                  28KB

                • memory/4164-62-0x00000000008C0000-0x00000000008D5000-memory.dmp

                  Filesize

                  84KB