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Analysis

  • max time kernel
    136s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231222-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25/12/2023, 21:03

General

  • Target

    3ca8c8d37aaf196e64823ea50c99f31b.exe

  • Size

    13.0MB

  • MD5

    3ca8c8d37aaf196e64823ea50c99f31b

  • SHA1

    77e4c78731986023345c93aae45916607be812b8

  • SHA256

    b4dd0c183d3d1773fa1c7d8bea616c7f1dfb88a976d3cf830e51a603d8ae2357

  • SHA512

    1ba499d0e8f3c253f4a5f16e7770150154f71809636e7967c74cc2caf1072da459c41aae6379f8e8d0d6e65f62daada99242e561fab2c25a6fa376bcb4c64709

  • SSDEEP

    6144:IxbQq7asTdx16ifogWuQK4ZpG3XQ4L0hlDF5r:8ashxM05WewpmAljr

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 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
  • 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\3ca8c8d37aaf196e64823ea50c99f31b.exe
    "C:\Users\Admin\AppData\Local\Temp\3ca8c8d37aaf196e64823ea50c99f31b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4052
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uueqfctt\
      2⤵
        PID:3964
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eilhtczv.exe" C:\Windows\SysWOW64\uueqfctt\
        2⤵
          PID:4876
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uueqfctt binPath= "C:\Windows\SysWOW64\uueqfctt\eilhtczv.exe /d\"C:\Users\Admin\AppData\Local\Temp\3ca8c8d37aaf196e64823ea50c99f31b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4120
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uueqfctt "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2660
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uueqfctt
          2⤵
          • Launches sc.exe
          PID:4380
        • 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:3120
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4052 -s 580
          2⤵
          • Program crash
          PID:1624
      • C:\Windows\SysWOW64\uueqfctt\eilhtczv.exe
        C:\Windows\SysWOW64\uueqfctt\eilhtczv.exe /d"C:\Users\Admin\AppData\Local\Temp\3ca8c8d37aaf196e64823ea50c99f31b.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3768
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:2256
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3768 -s 516
          2⤵
          • Program crash
          PID:1388
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4052 -ip 4052
        1⤵
          PID:3208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 3768 -ip 3768
          1⤵
            PID:440

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            1.2MB

            MD5

            aa0cde174a68d52e8f1e51d9528d9079

            SHA1

            ff4c450c25f006bbd4bf0d1aa441fb9c91a2ab07

            SHA256

            edac5848e60626839666bac9cd5c419122d55c5d30321e0a3502bc4bb0057154

            SHA512

            8dbe43f37319d598f0db49325a9dec9c59cad0516c6f9375695f5587d2ab041d06958c2848bc528cba0305b38b773c6ed38bee46cdd64a0d1676809a68d8e98e

          • C:\Windows\SysWOW64\uueqfctt\eilhtczv.exe

            Filesize

            701KB

            MD5

            fc20010b6161cd62cb170a6edf570dc2

            SHA1

            90b59d7abb3a075390add8f05319edc4fb22cecb

            SHA256

            d04e075302a100a70d0eb87f60b30afe9ba2fa4238df38f169e53cc0f918404a

            SHA512

            20929e6b4c4e0f622c184252638a1915f8a96ad9d7fafdc7346aa45000ba54a66470d71fb23f56a608448ea9a2cea94061b829c6117023424b8045f789ce7e2d

          • memory/2256-10-0x0000000000F00000-0x0000000000F15000-memory.dmp

            Filesize

            84KB

          • memory/2256-18-0x0000000000F00000-0x0000000000F15000-memory.dmp

            Filesize

            84KB

          • memory/2256-16-0x0000000000F00000-0x0000000000F15000-memory.dmp

            Filesize

            84KB

          • memory/2256-14-0x0000000000F00000-0x0000000000F15000-memory.dmp

            Filesize

            84KB

          • memory/3768-15-0x0000000000400000-0x00000000004BF000-memory.dmp

            Filesize

            764KB

          • memory/3768-13-0x0000000000650000-0x0000000000750000-memory.dmp

            Filesize

            1024KB

          • memory/4052-9-0x0000000000550000-0x0000000000563000-memory.dmp

            Filesize

            76KB

          • memory/4052-1-0x0000000000650000-0x0000000000750000-memory.dmp

            Filesize

            1024KB

          • memory/4052-8-0x0000000000400000-0x00000000004BF000-memory.dmp

            Filesize

            764KB

          • memory/4052-3-0x0000000000400000-0x00000000004BF000-memory.dmp

            Filesize

            764KB

          • memory/4052-2-0x0000000000550000-0x0000000000563000-memory.dmp

            Filesize

            76KB