Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25/10/2022, 01:19

General

  • Target
    file.exe
  • Size 220KB
  • Sample221025-bphqmsbbe6
  • SHA256 b1d61dc75046c0eb1c4418131fac2c8710248cbdd001dbd7b0df6d39a4d5bfb8
  • 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.

  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rdnawwfi\
      2⤵
        PID:4084
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cbabcmor.exe" C:\Windows\SysWOW64\rdnawwfi\
        2⤵
          PID:732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rdnawwfi binPath= "C:\Windows\SysWOW64\rdnawwfi\cbabcmor.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1068
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rdnawwfi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4088
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rdnawwfi
          2⤵
          • Launches sc.exe
          PID:1480
        • 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:4248
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4236 -s 1040
          2⤵
          • Program crash
          PID:1928
      • C:\Windows\SysWOW64\rdnawwfi\cbabcmor.exe
        C:\Windows\SysWOW64\rdnawwfi\cbabcmor.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1676
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:4876
          • 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:3120
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1676 -s 508
          2⤵
          • Program crash
          PID:3716
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4236 -ip 4236
        1⤵
          PID:4488
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1676 -ip 1676
          1⤵
            PID:2568

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                cbabcmor.exe

                • Path C:\Users\Admin\AppData\Local\Temp\cbabcmor.exe
                • Size 13.0MB
                • SHA256 ee8945910baf2fdd14276fd7db150b60f11532675d0efe757003c7de5f91387e
                • MD5 SHA1 SHA512 SSDEEP

                cbabcmor.exe

                • Path C:\Windows\SysWOW64\rdnawwfi\cbabcmor.exe
                • Size 13.0MB
                • SHA256 ee8945910baf2fdd14276fd7db150b60f11532675d0efe757003c7de5f91387e
                • MD5 SHA1 SHA512 SSDEEP

                memory/1676-155-0x0000000000400000-0x0000000000594000-memory.dmp

                memory/1676-153-0x000000000086E000-0x000000000087E000-memory.dmp

                memory/3120-181-0x0000000000A30000-0x0000000000B21000-memory.dmp

                memory/3120-176-0x0000000000A30000-0x0000000000B21000-memory.dmp

                memory/4236-146-0x00000000008B3000-0x00000000008C4000-memory.dmp

                memory/4236-148-0x0000000000400000-0x0000000000594000-memory.dmp

                memory/4236-135-0x00000000008B3000-0x00000000008C4000-memory.dmp

                memory/4236-147-0x00000000006F0000-0x0000000000703000-memory.dmp

                memory/4236-138-0x0000000000400000-0x0000000000594000-memory.dmp

                memory/4236-136-0x00000000006F0000-0x0000000000703000-memory.dmp

                memory/4876-157-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/4876-160-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

                memory/4876-163-0x00000000019E0000-0x00000000019F0000-memory.dmp

                memory/4876-166-0x00000000019F0000-0x00000000019F5000-memory.dmp

                memory/4876-169-0x0000000007200000-0x000000000760B000-memory.dmp

                memory/4876-172-0x00000000027D0000-0x00000000027D7000-memory.dmp

                memory/4876-156-0x0000000000650000-0x0000000000665000-memory.dmp

                memory/4876-154-0x0000000000650000-0x0000000000665000-memory.dmp

                memory/4876-150-0x0000000000650000-0x0000000000665000-memory.dmp