Analysis

  • max time kernel
    155s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/10/2022, 03:10

General

  • Target

    8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948.exe

  • Size

    260KB

  • MD5

    44edabdf619d4053046aee3cb173f71a

  • SHA1

    f9063933aa8ccb88bb27fde40f024161621562ce

  • SHA256

    8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948

  • SHA512

    9cef6e271502f08e5be2f66c37fbfba4b166a3057d5f3a260330807a4434fc4a7f478c381050e798aededa1880244c37fbdd78a505d389306693ccfa33671c4b

  • SSDEEP

    3072:CylhBhD16Lz+BPyz58CGNmpyt8SFPeoA48L8XKP70YNfehLM/h3:/hBV0L6BIbpM1eoA48WKP4YFi

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 4 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\8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948.exe
    "C:\Users\Admin\AppData\Local\Temp\8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4808
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jihdwzgd\
      2⤵
        PID:1468
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vyhssool.exe" C:\Windows\SysWOW64\jihdwzgd\
        2⤵
          PID:1668
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jihdwzgd binPath= "C:\Windows\SysWOW64\jihdwzgd\vyhssool.exe /d\"C:\Users\Admin\AppData\Local\Temp\8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jihdwzgd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jihdwzgd
          2⤵
          • Launches sc.exe
          PID:3712
        • 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:3564
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 676
          2⤵
          • Program crash
          PID:2956
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4808 -ip 4808
        1⤵
          PID:3644
        • C:\Windows\SysWOW64\jihdwzgd\vyhssool.exe
          C:\Windows\SysWOW64\jihdwzgd\vyhssool.exe /d"C:\Users\Admin\AppData\Local\Temp\8599ddccedc85d18748cf9541133f1515f5cf3a4e4d39e100531d496d70cb948.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3112
          • 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:2880
            • 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:4088
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3112 -s 660
            2⤵
            • Program crash
            PID:4256
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3112 -s 716
            2⤵
            • Program crash
            PID:1440
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3112 -s 736
            2⤵
            • Program crash
            PID:4592
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3112 -ip 3112
          1⤵
            PID:4120
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3112 -ip 3112
            1⤵
              PID:4460
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 208 -p 3112 -ip 3112
              1⤵
                PID:2724

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

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

                Filesize

                12.2MB

                MD5

                557df7c4005c66797fb5e6b62201a00a

                SHA1

                3290212684c5c52ae3c410471d39e7a61bc4b7b1

                SHA256

                312ba43885477ff492e2add77820b509d44c5f0cf8c8b3f6b32ea80afba07dc5

                SHA512

                87152dbd981f3d3bf7438b0e43e2021e31c7e54bc53c5e6c28e5d65f7bd6b8dcff51302da877765df8d466e0d162dc80436e88206eaab4fe021fd01e743f2d02

              • C:\Windows\SysWOW64\jihdwzgd\vyhssool.exe

                Filesize

                12.2MB

                MD5

                557df7c4005c66797fb5e6b62201a00a

                SHA1

                3290212684c5c52ae3c410471d39e7a61bc4b7b1

                SHA256

                312ba43885477ff492e2add77820b509d44c5f0cf8c8b3f6b32ea80afba07dc5

                SHA512

                87152dbd981f3d3bf7438b0e43e2021e31c7e54bc53c5e6c28e5d65f7bd6b8dcff51302da877765df8d466e0d162dc80436e88206eaab4fe021fd01e743f2d02

              • memory/2880-155-0x0000000002E00000-0x000000000300F000-memory.dmp

                Filesize

                2.1MB

              • memory/2880-170-0x00000000025E0000-0x00000000025E7000-memory.dmp

                Filesize

                28KB

              • memory/2880-167-0x0000000007D00000-0x000000000810B000-memory.dmp

                Filesize

                4.0MB

              • memory/2880-164-0x00000000025D0000-0x00000000025D5000-memory.dmp

                Filesize

                20KB

              • memory/2880-161-0x0000000002580000-0x0000000002590000-memory.dmp

                Filesize

                64KB

              • memory/2880-158-0x0000000002570000-0x0000000002576000-memory.dmp

                Filesize

                24KB

              • memory/2880-154-0x0000000001100000-0x0000000001115000-memory.dmp

                Filesize

                84KB

              • memory/2880-153-0x0000000001100000-0x0000000001115000-memory.dmp

                Filesize

                84KB

              • memory/2880-148-0x0000000001100000-0x0000000001115000-memory.dmp

                Filesize

                84KB

              • memory/3112-152-0x0000000000400000-0x0000000002C2F000-memory.dmp

                Filesize

                40.2MB

              • memory/3112-151-0x0000000002F62000-0x0000000002F78000-memory.dmp

                Filesize

                88KB

              • memory/4088-179-0x0000000000800000-0x00000000008F1000-memory.dmp

                Filesize

                964KB

              • memory/4088-174-0x0000000000800000-0x00000000008F1000-memory.dmp

                Filesize

                964KB

              • memory/4808-145-0x0000000002E37000-0x0000000002E4C000-memory.dmp

                Filesize

                84KB

              • memory/4808-132-0x0000000002E37000-0x0000000002E4C000-memory.dmp

                Filesize

                84KB

              • memory/4808-134-0x0000000000400000-0x0000000002C2F000-memory.dmp

                Filesize

                40.2MB

              • memory/4808-136-0x0000000002E37000-0x0000000002E4C000-memory.dmp

                Filesize

                84KB

              • memory/4808-133-0x0000000002D80000-0x0000000002D93000-memory.dmp

                Filesize

                76KB

              • memory/4808-146-0x0000000000400000-0x0000000002C2F000-memory.dmp

                Filesize

                40.2MB

              • memory/4808-137-0x0000000002D80000-0x0000000002D93000-memory.dmp

                Filesize

                76KB