Resubmissions

29-10-2021 09:03

211029-kz7xysdac7 10

28-10-2021 13:28

211028-qq5dcsgdeq 10

23-10-2021 01:52

211023-cagepshab4 8

Analysis

  • max time kernel
    117s
  • max time network
    135s
  • platform
    windows10_x64
  • resource
    win10-en-20210920
  • submitted
    29-10-2021 09:03

General

  • Target

    steriok.exe

  • Size

    94KB

  • MD5

    b0c615c0a4f485b2030d6e1ab98375f0

  • SHA1

    de11e9d61e0a31dc19e8c5dd8fe06facf0ead052

  • SHA256

    eb2ed1680e9b2350d78f431849a9e8c5c1d91d97ae72767d228b2208e6f72f46

  • SHA512

    82342be7d388244b5b008134d6d351f669995caff94a9a532ce056130f1af54a20ec6f2b9a3ca78102200c53a73659d1043e5b213ce84642d225690a3a848024

Score
8/10

Malware Config

Signatures

  • Modifies extensions of user files 12 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Drops startup file 1 IoCs
  • Drops desktop.ini file(s) 3 IoCs
  • Drops file in Program Files directory 59 IoCs
  • Drops file in Windows directory 23 IoCs
  • Launches sc.exe

    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.

  • Kills process with taskkill 48 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 49 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\steriok.exe
    "C:\Users\Admin\AppData\Local\Temp\steriok.exe"
    1⤵
    • Modifies extensions of user files
    • Drops startup file
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:4268
    • C:\Windows\SysWOW64\taskkill.exe
      "taskkill" /F /IM RaccineSettings.exe
      2⤵
      • Kills process with taskkill
      • Suspicious use of AdjustPrivilegeToken
      PID:4592
    • C:\Windows\SysWOW64\reg.exe
      "reg" delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /V "Raccine Tray" /F
      2⤵
        PID:4492
      • C:\Windows\SysWOW64\reg.exe
        "reg" delete HKCU\Software\Raccine /F
        2⤵
        • Modifies registry key
        PID:3476
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /DELETE /TN "Raccine Rules Updater" /F
        2⤵
          PID:4328
        • C:\Windows\SysWOW64\cmd.exe
          "cmd.exe" /c rd /s /q %SYSTEMDRIVE%\\$Recycle.bin
          2⤵
            PID:436
          • C:\Windows\SysWOW64\sc.exe
            "sc.exe" config Dnscache start= auto
            2⤵
              PID:828
            • C:\Windows\SysWOW64\sc.exe
              "sc.exe" config FDResPub start= auto
              2⤵
                PID:636
              • C:\Windows\SysWOW64\sc.exe
                "sc.exe" config SQLTELEMETRY start= disabled
                2⤵
                  PID:912
                • C:\Windows\SysWOW64\sc.exe
                  "sc.exe" config SSDPSRV start= auto
                  2⤵
                    PID:1448
                  • C:\Windows\SysWOW64\sc.exe
                    "sc.exe" config SQLTELEMETRY$ECWDB2 start= disabled
                    2⤵
                      PID:1576
                    • C:\Windows\SysWOW64\sc.exe
                      "sc.exe" config SstpSvc start= disabled
                      2⤵
                        PID:1700
                      • C:\Windows\SysWOW64\sc.exe
                        "sc.exe" config upnphost start= auto
                        2⤵
                          PID:2136
                        • C:\Windows\SysWOW64\sc.exe
                          "sc.exe" config SQLWriter start= disabled
                          2⤵
                            PID:2540
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mspub.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2864
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM synctime.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:3156
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mspub.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:3888
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mydesktopqos.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4920
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM Ntrtscan.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1284
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mysqld.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1300
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mydesktopservice.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4996
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM isqlplussvc.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4692
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM sqbcoreservice.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4664
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM firefoxconfig.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4860
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM encsvc.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4772
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM onenote.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:616
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM excel.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1192
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM dbeng50.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4704
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM agntsvc.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1396
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM CNTAoSMgr.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2440
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM PccNTMon.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1328
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM thebat64.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2324
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM thebat.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4104
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM sqlwriter.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:956
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM msaccess.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2364
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM ocomm.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:3632
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM steam.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2212
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM tbirdconfig.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:5112
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM outlook.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:3644
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" IM thunderbird.exe /F
                            2⤵
                            • Kills process with taskkill
                            PID:3776
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM tmlisten.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2668
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM dbsnmp.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4584
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM wordpad.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:3012
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM infopath.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4272
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM msftesql.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4196
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM xfssvccon.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:964
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mysqld-opt.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:660
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mbamtray.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1364
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM powerpnt.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1564
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM zoolz.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1488
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM ocautoupds.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2804
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mydesktopqos.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2776
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM ocssd.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4592
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM visio.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2856
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mydesktopservice.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4160
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM oracle.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:3200
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM winword.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:5004
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM sqlagent.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4980
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM sqlbrowser.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1508
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM mysqld-nt.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:5052
                          • C:\Windows\SysWOW64\taskkill.exe
                            "taskkill.exe" /IM sqlservr.exe /F
                            2⤵
                            • Kills process with taskkill
                            • Suspicious use of AdjustPrivilegeToken
                            PID:1220
                          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                            "powershell.exe" & Get-WmiObject Win32_Shadowcopy | ForEach-Object { $_Delete(); }
                            2⤵
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4296
                          • C:\Windows\SysWOW64\notepad.exe
                            "C:\Windows\System32\notepad.exe" C:\Users\Admin\Desktop\RESTORE_FILES_INFO.txt
                            2⤵
                            • Opens file in notepad (likely ransom note)
                            PID:3460
                          • C:\Windows\SysWOW64\cmd.exe
                            "cmd.exe" /C ping 127.0.0.7 -n 3 > Nul & fsutil file setZeroData offset=0 length=524288 “%s” & Del /f /q “%s”
                            2⤵
                              PID:2148
                              • C:\Windows\SysWOW64\PING.EXE
                                ping 127.0.0.7 -n 3
                                3⤵
                                • Runs ping.exe
                                PID:2944
                              • C:\Windows\SysWOW64\fsutil.exe
                                fsutil file setZeroData offset=0 length=524288 “%s”
                                3⤵
                                  PID:3444
                              • C:\Windows\SysWOW64\cmd.exe
                                "C:\Windows\System32\cmd.exe" "/C choice /C Y /N /D Y /T 3 & Del "C:\Users\Admin\AppData\Local\Temp\steriok.exe
                                2⤵
                                  PID:3160
                                  • C:\Windows\SysWOW64\choice.exe
                                    choice /C Y /N /D Y /T 3
                                    3⤵
                                      PID:3996

                                Network

                                MITRE ATT&CK Enterprise v6

                                Replay Monitor

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                                Downloads

                                • memory/4268-115-0x0000000000910000-0x0000000000911000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4268-117-0x0000000005190000-0x0000000005191000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4268-118-0x0000000005180000-0x0000000005181000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-190-0x00000000073A0000-0x00000000073A1000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-193-0x0000000002D20000-0x0000000002D21000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-204-0x0000000006DE3000-0x0000000006DE4000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-205-0x0000000006DE4000-0x0000000006DE6000-memory.dmp

                                  Filesize

                                  8KB

                                • memory/4296-203-0x0000000002D20000-0x0000000002D21000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-192-0x0000000008220000-0x0000000008221000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-191-0x0000000007F90000-0x0000000007F91000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-189-0x0000000007BC0000-0x0000000007BC1000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-187-0x0000000006DE2000-0x0000000006DE3000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-186-0x0000000006DE0000-0x0000000006DE1000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-185-0x0000000007310000-0x0000000007311000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-184-0x0000000007190000-0x0000000007191000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-180-0x0000000002D20000-0x0000000002D21000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-181-0x0000000002D20000-0x0000000002D21000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-182-0x0000000004710000-0x0000000004711000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/4296-183-0x0000000007420000-0x0000000007421000-memory.dmp

                                  Filesize

                                  4KB