Analysis

  • max time kernel
    151s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/03/2024, 06:27

General

  • Target

    c532dd750e39a5b79ecccdeb26e153f5.exe

  • Size

    14.3MB

  • MD5

    c532dd750e39a5b79ecccdeb26e153f5

  • SHA1

    2c4d78ab07cf322e488da622f08255b8c04f623c

  • SHA256

    3da981808b1a529f3e59f6c56e42809d38c4cfdd93d6c0efc5e1a80cac3d5d16

  • SHA512

    979acb280679023cc6f181e2aef3925da23b165cfbf408760fa428e819306e0b3f9d04751053ac11bfb7e1be4571994c5262f414cd418e5ec98766b0502da4cf

  • SSDEEP

    24576:cgdy5yNM4444444444444444444444444444444444444444444444444444444s:

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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 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
  • 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
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c532dd750e39a5b79ecccdeb26e153f5.exe
    "C:\Users\Admin\AppData\Local\Temp\c532dd750e39a5b79ecccdeb26e153f5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4228
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oxfjjzkh\
      2⤵
        PID:4960
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ycjnpsiu.exe" C:\Windows\SysWOW64\oxfjjzkh\
        2⤵
          PID:5020
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create oxfjjzkh binPath= "C:\Windows\SysWOW64\oxfjjzkh\ycjnpsiu.exe /d\"C:\Users\Admin\AppData\Local\Temp\c532dd750e39a5b79ecccdeb26e153f5.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description oxfjjzkh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4416
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start oxfjjzkh
          2⤵
          • Launches sc.exe
          PID:3892
        • 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:3260
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4228 -s 1248
          2⤵
          • Program crash
          PID:4868
      • C:\Windows\SysWOW64\oxfjjzkh\ycjnpsiu.exe
        C:\Windows\SysWOW64\oxfjjzkh\ycjnpsiu.exe /d"C:\Users\Admin\AppData\Local\Temp\c532dd750e39a5b79ecccdeb26e153f5.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3516
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:3420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3516 -s 548
          2⤵
          • Program crash
          PID:2296
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4228 -ip 4228
        1⤵
          PID:4104
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3516 -ip 3516
          1⤵
            PID:4956

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

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

                  Filesize

                  6.4MB

                  MD5

                  c1e109055fe096c74e4c863262438c34

                  SHA1

                  51f7053d3c1c6e43541f53f1f2fa907151465939

                  SHA256

                  704a56bf6f29e62c8a4b220c3473e4ea92c726a9978492f4be8d87a9212a0e92

                  SHA512

                  9fa5453ef3e3985f05d0f3e9ff58e07c361e964888d313f1d5b18fffb70de3082d40a63981a5a2c9619f501bc7f7b2221ea433b24d9e38cc91aed9884986211b

                • C:\Windows\SysWOW64\oxfjjzkh\ycjnpsiu.exe

                  Filesize

                  2.3MB

                  MD5

                  f9413ec45a91c7d92a5304db9baffb71

                  SHA1

                  476c14bf6da03d33327c6f933c78a6ebf237f347

                  SHA256

                  7ca0dfada30bf58582aa9b727ecbe9db01a1092a00e4047b1a2e97e1c4ca0dda

                  SHA512

                  47dc2f9acdae08c7a9f4aaa3da0b2ad86dc5705c0f887c22086f7721e546c4438e9dbac32f1df7a55e7d8143ceedf16a4390241888b8130a6d9a65b5b1e09227

                • memory/3420-12-0x0000000000810000-0x0000000000825000-memory.dmp

                  Filesize

                  84KB

                • memory/3420-18-0x0000000000810000-0x0000000000825000-memory.dmp

                  Filesize

                  84KB

                • memory/3420-16-0x0000000000810000-0x0000000000825000-memory.dmp

                  Filesize

                  84KB

                • memory/3420-15-0x0000000000810000-0x0000000000825000-memory.dmp

                  Filesize

                  84KB

                • memory/3516-10-0x0000000000690000-0x0000000000790000-memory.dmp

                  Filesize

                  1024KB

                • memory/3516-11-0x0000000000400000-0x0000000000456000-memory.dmp

                  Filesize

                  344KB

                • memory/3516-17-0x0000000000400000-0x0000000000456000-memory.dmp

                  Filesize

                  344KB

                • memory/4228-9-0x0000000000700000-0x0000000000713000-memory.dmp

                  Filesize

                  76KB

                • memory/4228-1-0x0000000000780000-0x0000000000880000-memory.dmp

                  Filesize

                  1024KB

                • memory/4228-8-0x0000000000400000-0x0000000000456000-memory.dmp

                  Filesize

                  344KB

                • memory/4228-3-0x0000000000400000-0x0000000000456000-memory.dmp

                  Filesize

                  344KB

                • memory/4228-2-0x0000000000700000-0x0000000000713000-memory.dmp

                  Filesize

                  76KB