Analysis

  • max time kernel
    149s
  • max time network
    151s
  • 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, 09:41

General

  • Target

    c58c41fb9de90f13223980a5147fdf71.exe

  • Size

    14.5MB

  • MD5

    c58c41fb9de90f13223980a5147fdf71

  • SHA1

    2e98477e74a0af057086b7161a3fbadb188df450

  • SHA256

    f1698aadacb8433276f1e225a8c00f0311d6bb2b721e40e2f88e4fecc3d6cd3e

  • SHA512

    f725e97b5bd5729318ab8dedc4a259b53ead052f39e0fbc2d65172a2afde65e1d01a4c0e36ef7f68c14086ef79cae2b973e56cf27952a0700474506097d63f5b

  • SSDEEP

    24576:0ATa7/2ggggggggggggggggggggggggggggggggggggggggggggggggggggggggr:0A27

Malware Config

Extracted

Family

tofsee

C2

176.111.174.19

defeatwax.ru

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\c58c41fb9de90f13223980a5147fdf71.exe
    "C:\Users\Admin\AppData\Local\Temp\c58c41fb9de90f13223980a5147fdf71.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1116
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kpempfxh\
      2⤵
        PID:1432
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\doftbivs.exe" C:\Windows\SysWOW64\kpempfxh\
        2⤵
          PID:3116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kpempfxh binPath= "C:\Windows\SysWOW64\kpempfxh\doftbivs.exe /d\"C:\Users\Admin\AppData\Local\Temp\c58c41fb9de90f13223980a5147fdf71.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3656
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kpempfxh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kpempfxh
          2⤵
          • Launches sc.exe
          PID:5076
        • 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:3264
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1116 -s 1028
          2⤵
          • Program crash
          PID:3172
      • C:\Windows\SysWOW64\kpempfxh\doftbivs.exe
        C:\Windows\SysWOW64\kpempfxh\doftbivs.exe /d"C:\Users\Admin\AppData\Local\Temp\c58c41fb9de90f13223980a5147fdf71.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3120
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:4532
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3120 -s 524
          2⤵
          • Program crash
          PID:2856
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1116 -ip 1116
        1⤵
          PID:1100
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 3120 -ip 3120
          1⤵
            PID:2288

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  13.2MB

                  MD5

                  ad4de3e5bdd83cedd504f1009e578c1f

                  SHA1

                  8a87a2bb98184280b2b23dd0be99e0c65368e6f2

                  SHA256

                  bd8a4bc43c392917f3f9707418acb402bd68ad9bf814d62480463472dde16138

                  SHA512

                  aea5a63870a4b24b973b41fca0e64829c3ffc1368bd678c7b73fa58d752451e639e349d5f644389cd8368eee68e58f5f90d49e6b83c9c802071fc7d23048010d

                • memory/1116-1-0x0000000000C70000-0x0000000000D70000-memory.dmp

                  Filesize

                  1024KB

                • memory/1116-2-0x0000000000C40000-0x0000000000C53000-memory.dmp

                  Filesize

                  76KB

                • memory/1116-4-0x0000000000400000-0x000000000099D000-memory.dmp

                  Filesize

                  5.6MB

                • memory/1116-8-0x0000000000400000-0x000000000099D000-memory.dmp

                  Filesize

                  5.6MB

                • memory/1116-9-0x0000000000C40000-0x0000000000C53000-memory.dmp

                  Filesize

                  76KB

                • memory/3120-10-0x0000000000B80000-0x0000000000C80000-memory.dmp

                  Filesize

                  1024KB

                • memory/3120-11-0x0000000000400000-0x000000000099D000-memory.dmp

                  Filesize

                  5.6MB

                • memory/3120-17-0x0000000000400000-0x000000000099D000-memory.dmp

                  Filesize

                  5.6MB

                • memory/4532-12-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/4532-15-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/4532-16-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/4532-18-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB