Analysis

  • max time kernel
    150s
  • 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
    26/03/2024, 08:39

General

  • Target

    debe4a88a9ba02f69a42ff9d1d3db1aa.exe

  • Size

    14.0MB

  • MD5

    debe4a88a9ba02f69a42ff9d1d3db1aa

  • SHA1

    75c854472d822031d61d90a995b68b91e3aee286

  • SHA256

    40ed19717bc806f511f30549b4be0b5968677539034246531127419781a09933

  • SHA512

    e741bffdecf5cb0098ea850bd45cd48ee1df9085153b4873ecaf30f5cba2b7bbb53957973d706ee9640453e24ca2f4782fde1fae36a01ae7e8e1c3e645da6d51

  • SSDEEP

    49152:SGvEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE:SG

Malware Config

Extracted

Family

tofsee

C2

43.231.4.6

lazystax.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\debe4a88a9ba02f69a42ff9d1d3db1aa.exe
    "C:\Users\Admin\AppData\Local\Temp\debe4a88a9ba02f69a42ff9d1d3db1aa.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:776
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fssxqypz\
      2⤵
        PID:1464
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yqynvtxv.exe" C:\Windows\SysWOW64\fssxqypz\
        2⤵
          PID:4804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fssxqypz binPath= "C:\Windows\SysWOW64\fssxqypz\yqynvtxv.exe /d\"C:\Users\Admin\AppData\Local\Temp\debe4a88a9ba02f69a42ff9d1d3db1aa.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fssxqypz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:920
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fssxqypz
          2⤵
          • Launches sc.exe
          PID:3968
        • 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:4788
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 776 -s 1224
          2⤵
          • Program crash
          PID:3780
      • C:\Windows\SysWOW64\fssxqypz\yqynvtxv.exe
        C:\Windows\SysWOW64\fssxqypz\yqynvtxv.exe /d"C:\Users\Admin\AppData\Local\Temp\debe4a88a9ba02f69a42ff9d1d3db1aa.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1164
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:4560
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1164 -s 512
          2⤵
          • Program crash
          PID:432
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 776 -ip 776
        1⤵
          PID:2520
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 1164 -ip 1164
          1⤵
            PID:4228

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.7MB

            MD5

            46efa9361858c0f5ef41eda6261ad609

            SHA1

            06ab4c49bfec0d575bc8cc8e9266c42f9bd284ab

            SHA256

            3646dd39f0674b14b8666dff0755fd429177f7611316a319152326a981c4a014

            SHA512

            1afe16a3f78f80022f6247ecf729c384164c0e049b612177ee3b5ca561c1fe915539a87fa0931a36570be2a7736a0a93fbc384d2f3624035c9a4c5a9f38ef361

          • memory/776-1-0x0000000000CC0000-0x0000000000DC0000-memory.dmp

            Filesize

            1024KB

          • memory/776-2-0x0000000002830000-0x0000000002843000-memory.dmp

            Filesize

            76KB

          • memory/776-4-0x0000000000400000-0x0000000000C14000-memory.dmp

            Filesize

            8.1MB

          • memory/776-7-0x0000000000400000-0x0000000000C14000-memory.dmp

            Filesize

            8.1MB

          • memory/776-8-0x0000000002830000-0x0000000002843000-memory.dmp

            Filesize

            76KB

          • memory/1164-11-0x0000000000400000-0x0000000000C14000-memory.dmp

            Filesize

            8.1MB

          • memory/1164-10-0x0000000000E40000-0x0000000000F40000-memory.dmp

            Filesize

            1024KB

          • memory/1164-17-0x0000000000400000-0x0000000000C14000-memory.dmp

            Filesize

            8.1MB

          • memory/4560-12-0x0000000000490000-0x00000000004A5000-memory.dmp

            Filesize

            84KB

          • memory/4560-15-0x0000000000490000-0x00000000004A5000-memory.dmp

            Filesize

            84KB

          • memory/4560-16-0x0000000000490000-0x00000000004A5000-memory.dmp

            Filesize

            84KB

          • memory/4560-18-0x0000000000490000-0x00000000004A5000-memory.dmp

            Filesize

            84KB

          • memory/4560-19-0x0000000000490000-0x00000000004A5000-memory.dmp

            Filesize

            84KB