Analysis

  • max time kernel
    96s
  • max time network
    15s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    02-03-2024 20:15

General

  • Target

    Chernobyl.exe

  • Size

    341KB

  • MD5

    7f1c19a77fc0bbffb1e71d08a40cd972

  • SHA1

    7dbcfe131b362583dd8185ea7e5c2f577e40ac02

  • SHA256

    f4a8b0e01d972c6150db282db7443f91a0bebf85edb5342df44502ed3cc4ce85

  • SHA512

    8df5ad36dd1dc15f8d533f2dce5a964a77b9072520dbb5e6c8674b16b310964b765c92824e994137f505c87c8f5761c70cc4914c25adb945363c6ed3d294cc59

  • SSDEEP

    6144:XYb7o0222222222222222222222222222222222222222222222222222222222x:BkZOZzv4TatsNqaJg

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • UAC bypass 3 TTPs 1 IoCs
  • Disables RegEdit via registry modification 1 IoCs
  • Disables Task Manager via registry modification
  • Possible privilege escalation attempt 14 IoCs
  • Modifies file permissions 1 TTPs 14 IoCs
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Modifies WinLogon 2 TTPs 2 IoCs
  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 14 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe
    "C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Disables RegEdit via registry modification
    • Checks whether UAC is enabled
    • Modifies WinLogon
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1688
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:960
      • C:\Windows\SysWOW64\rundll32.exe
        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
        3⤵
          PID:328
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:564
        • C:\Windows\SysWOW64\rundll32.exe
          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
          3⤵
            PID:1752
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:844
          • C:\Windows\SysWOW64\rundll32.exe
            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
            3⤵
              PID:708
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2868
            • C:\Windows\SysWOW64\rundll32.exe
              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
              3⤵
                PID:584
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:1748
              • C:\Windows\SysWOW64\rundll32.exe
                RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                3⤵
                  PID:1732
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                2⤵
                  PID:900
                  • C:\Windows\SysWOW64\rundll32.exe
                    RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                    3⤵
                      PID:1588
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                    2⤵
                      PID:1980
                      • C:\Windows\SysWOW64\rundll32.exe
                        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                        3⤵
                          PID:2260
                      • C:\Windows\SysWOW64\cmd.exe
                        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                        2⤵
                          PID:1600
                          • C:\Windows\SysWOW64\rundll32.exe
                            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                            3⤵
                              PID:2824
                          • C:\Windows\SysWOW64\cmd.exe
                            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                            2⤵
                              PID:2224
                              • C:\Windows\SysWOW64\rundll32.exe
                                RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                3⤵
                                  PID:3008
                              • C:\Windows\SysWOW64\cmd.exe
                                "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                2⤵
                                  PID:1132
                                  • C:\Windows\SysWOW64\rundll32.exe
                                    RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                    3⤵
                                      PID:2624
                                  • C:\Windows\SysWOW64\cmd.exe
                                    "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                    2⤵
                                      PID:3012
                                      • C:\Windows\SysWOW64\rundll32.exe
                                        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                        3⤵
                                          PID:2680
                                      • C:\Windows\SysWOW64\cmd.exe
                                        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                        2⤵
                                          PID:2552
                                          • C:\Windows\SysWOW64\rundll32.exe
                                            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                            3⤵
                                              PID:2740
                                          • C:\Windows\SysWOW64\cmd.exe
                                            "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\smss.exe && icacls C:\Windows\System32\smss.exe /grant "%username%:F" && exit
                                            2⤵
                                              PID:1432
                                              • C:\Windows\SysWOW64\takeown.exe
                                                takeown /f C:\Windows\System32\smss.exe
                                                3⤵
                                                • Possible privilege escalation attempt
                                                • Modifies file permissions
                                                • Suspicious use of AdjustPrivilegeToken
                                                PID:1484
                                            • C:\Windows\SysWOW64\cmd.exe
                                              "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\csrss.exe && icacls C:\Windows\System32\csrss.exe /grant "%username%:F" && exit
                                              2⤵
                                                PID:2708
                                                • C:\Windows\SysWOW64\takeown.exe
                                                  takeown /f C:\Windows\System32\csrss.exe
                                                  3⤵
                                                  • Possible privilege escalation attempt
                                                  • Modifies file permissions
                                                  • Suspicious use of AdjustPrivilegeToken
                                                  PID:2744
                                              • C:\Windows\SysWOW64\cmd.exe
                                                "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\wininit.exe && icacls C:\Windows\System32\wininit.exe /grant "%username%:F" && exit
                                                2⤵
                                                  PID:1624
                                                  • C:\Windows\SysWOW64\takeown.exe
                                                    takeown /f C:\Windows\System32\wininit.exe
                                                    3⤵
                                                    • Possible privilege escalation attempt
                                                    • Modifies file permissions
                                                    • Suspicious use of AdjustPrivilegeToken
                                                    PID:1520
                                                  • C:\Windows\SysWOW64\icacls.exe
                                                    icacls C:\Windows\System32\wininit.exe /grant "Admin:F"
                                                    3⤵
                                                    • Possible privilege escalation attempt
                                                    • Modifies file permissions
                                                    PID:1548
                                                • C:\Windows\SysWOW64\cmd.exe
                                                  "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\LogonUI.exe && icacls C:\Windows\System32\LogonUI.exe /grant "%username%:F" && exit
                                                  2⤵
                                                    PID:1396
                                                    • C:\Windows\SysWOW64\takeown.exe
                                                      takeown /f C:\Windows\System32\LogonUI.exe
                                                      3⤵
                                                      • Possible privilege escalation attempt
                                                      • Modifies file permissions
                                                      • Suspicious use of AdjustPrivilegeToken
                                                      PID:1756
                                                  • C:\Windows\SysWOW64\cmd.exe
                                                    "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\lsass.exe && icacls C:\Windows\System32\lsass.exe /grant "%username%:F" && exit
                                                    2⤵
                                                      PID:2892
                                                      • C:\Windows\SysWOW64\takeown.exe
                                                        takeown /f C:\Windows\System32\lsass.exe
                                                        3⤵
                                                        • Possible privilege escalation attempt
                                                        • Modifies file permissions
                                                        • Suspicious use of AdjustPrivilegeToken
                                                        PID:2736
                                                    • C:\Windows\SysWOW64\cmd.exe
                                                      "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\services.exe && icacls C:\Windows\System32\services.exe /grant "%username%:F" && exit
                                                      2⤵
                                                        PID:2148
                                                        • C:\Windows\SysWOW64\takeown.exe
                                                          takeown /f C:\Windows\System32\services.exe
                                                          3⤵
                                                          • Possible privilege escalation attempt
                                                          • Modifies file permissions
                                                          • Suspicious use of AdjustPrivilegeToken
                                                          PID:1380
                                                      • C:\Windows\SysWOW64\cmd.exe
                                                        "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winlogon.exe && icacls C:\Windows\System32\winlogon.exe /grant "%username%:F" && exit
                                                        2⤵
                                                          PID:1876
                                                          • C:\Windows\SysWOW64\takeown.exe
                                                            takeown /f C:\Windows\System32\winlogon.exe
                                                            3⤵
                                                            • Possible privilege escalation attempt
                                                            • Modifies file permissions
                                                            • Suspicious use of AdjustPrivilegeToken
                                                            PID:2060
                                                        • C:\Windows\SysWOW64\cmd.exe
                                                          "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winload.efi && icacls C:\Windows\System32\winload.efi /grant "%username%:F" && exit
                                                          2⤵
                                                            PID:2184
                                                            • C:\Windows\SysWOW64\takeown.exe
                                                              takeown /f C:\Windows\System32\winload.efi
                                                              3⤵
                                                              • Possible privilege escalation attempt
                                                              • Modifies file permissions
                                                              • Suspicious use of AdjustPrivilegeToken
                                                              PID:1856
                                                          • C:\Windows\SysWOW64\cmd.exe
                                                            "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winload.exe && icacls C:\Windows\System32\winload.exe /grant "%username%:F" && exit
                                                            2⤵
                                                              PID:2588
                                                              • C:\Windows\SysWOW64\takeown.exe
                                                                takeown /f C:\Windows\System32\winload.exe
                                                                3⤵
                                                                • Possible privilege escalation attempt
                                                                • Modifies file permissions
                                                                • Suspicious use of AdjustPrivilegeToken
                                                                PID:1172
                                                            • C:\Windows\SysWOW64\cmd.exe
                                                              "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\ntoskrnl.exe && icacls C:\Windows\System32\ntoskrnl.exe /grant "%username%:F" && exit
                                                              2⤵
                                                                PID:2196
                                                                • C:\Windows\SysWOW64\takeown.exe
                                                                  takeown /f C:\Windows\System32\ntoskrnl.exe
                                                                  3⤵
                                                                  • Possible privilege escalation attempt
                                                                  • Modifies file permissions
                                                                  • Suspicious use of AdjustPrivilegeToken
                                                                  PID:2848
                                                                • C:\Windows\SysWOW64\icacls.exe
                                                                  icacls C:\Windows\System32\ntoskrnl.exe /grant "Admin:F"
                                                                  3⤵
                                                                  • Possible privilege escalation attempt
                                                                  • Modifies file permissions
                                                                  PID:2816
                                                              • C:\Windows\SysWOW64\cmd.exe
                                                                "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\svchost.exe && icacls C:\Windows\System32\svchost.exe /grant "%username%:F" && exit
                                                                2⤵
                                                                  PID:1052
                                                                  • C:\Windows\SysWOW64\takeown.exe
                                                                    takeown /f C:\Windows\System32\svchost.exe
                                                                    3⤵
                                                                    • Possible privilege escalation attempt
                                                                    • Modifies file permissions
                                                                    • Suspicious use of AdjustPrivilegeToken
                                                                    PID:700
                                                                  • C:\Windows\SysWOW64\icacls.exe
                                                                    icacls C:\Windows\System32\svchost.exe /grant "Admin:F"
                                                                    3⤵
                                                                    • Possible privilege escalation attempt
                                                                    • Modifies file permissions
                                                                    PID:1724
                                                              • C:\Windows\explorer.exe
                                                                "C:\Windows\explorer.exe"
                                                                1⤵
                                                                  PID:2424
                                                                • C:\Windows\system32\rundll32.exe
                                                                  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\Desktop\╠ï▐♂▀8╤εř╧•žï±♪♣█ל—•µ♪¢®¼╠ß±Â↑¤Ÿ↑☻╧▬ßï4╤▀æ6♥╬—▼Â▲æ▼•►57řžäó♦ÆěŸ²8¥σš¤♪☻2♫9í♫66ö½♠↕ř█▼■5π½♣▄╥²╚ß9▼9½
                                                                  1⤵
                                                                  • Modifies registry class
                                                                  PID:1536
                                                                  • C:\Windows\system32\NOTEPAD.EXE
                                                                    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\╠ï▐♂▀8╤εř╧•žï±♪♣█ל—•µ♪¢®¼╠ß±Â↑¤Ÿ↑☻╧▬ßï4╤▀æ6♥╬—▼Â▲æ▼•►57řžäó♦ÆěŸ²8¥σš¤♪☻2♫9í♫66ö½♠↕ř█▼■5π½♣▄╥²╚ß9▼9½
                                                                    2⤵
                                                                      PID:1640

                                                                  Network

                                                                  MITRE ATT&CK Enterprise v15

                                                                  Replay Monitor

                                                                  Loading Replay Monitor...

                                                                  Downloads

                                                                  • C:\Users\Admin\Desktop\å╩éš╠¢■8○╔↑œ▄ñφč■∞䟗¬3╧ó▼∞♫šΣ○ö╧↕φ×█♂¬ïÂ♫ńéä1µ☻╬ě♣♫²×√◙▌σ◙♣ß╠▲╚♣☻♦ñΣ•╠╤○☼▀π¶▼▬σ╚æÂ™¢♦ě¤í≈▄♂☼88éΣč▬•

                                                                    Filesize

                                                                    666B

                                                                    MD5

                                                                    9e1e5883c74742a497cf5c272ccd2321

                                                                    SHA1

                                                                    2cf33e34d08b8e17743a60352baffef4b6f02dee

                                                                    SHA256

                                                                    ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a

                                                                    SHA512

                                                                    f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

                                                                  • memory/1688-1-0x0000000074D50000-0x000000007543E000-memory.dmp

                                                                    Filesize

                                                                    6.9MB

                                                                  • memory/1688-0-0x0000000001360000-0x00000000013BC000-memory.dmp

                                                                    Filesize

                                                                    368KB

                                                                  • memory/1688-306-0x0000000000D50000-0x0000000000D90000-memory.dmp

                                                                    Filesize

                                                                    256KB

                                                                  • memory/1688-307-0x0000000074D50000-0x000000007543E000-memory.dmp

                                                                    Filesize

                                                                    6.9MB

                                                                  • memory/1688-308-0x0000000000D50000-0x0000000000D90000-memory.dmp

                                                                    Filesize

                                                                    256KB

                                                                  • memory/1688-310-0x0000000000D50000-0x0000000000D90000-memory.dmp

                                                                    Filesize

                                                                    256KB