Analysis

  • max time kernel
    180s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-12-2023 13:53

General

  • Target

    b0c3c2a0596614eeb982676f23b2b3c2.exe

  • Size

    4.2MB

  • MD5

    b0c3c2a0596614eeb982676f23b2b3c2

  • SHA1

    4fd90dccbb3d603c522b5a3ed172004131f45413

  • SHA256

    c2add78326f26be631d5cf21ff3ca5e5393b090adb1dc7b11a14f29a00818ac2

  • SHA512

    3a5cb95b6ed274debd2ec711f58d1ae647b8725aa86c63b8181accc48bc26cb2311ca62cd5dabc0906c3daf4866cb861fae6ff1e054f2ad94b237bc5d7391a44

  • SSDEEP

    98304:KI6X9OmbHlT6U1FGbJqj2OCuaIGbFAUqxdijH8tk8vp8K:jmbN6kEJqjGu7iFoxk8+

Malware Config

Signatures

  • ServHelper

    ServHelper is a backdoor written in Delphi and is associated with the hacking group TA505.

  • Grants admin privileges 1 TTPs

    Uses net.exe to modify the user's privileges.

  • Modifies RDP port number used by Windows 1 TTPs
  • Possible privilege escalation attempt 8 IoCs
  • Sets DLL path for service in the registry 2 TTPs 1 IoCs
  • Modifies file permissions 1 TTPs 8 IoCs
  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 8 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious behavior: LoadsDriver 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b0c3c2a0596614eeb982676f23b2b3c2.exe
    "C:\Users\Admin\AppData\Local\Temp\b0c3c2a0596614eeb982676f23b2b3c2.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2156
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" -ep bypass & 'C:\Users\Admin\AppData\Local\Temp\\ready.ps1'
      2⤵
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3516
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\tpm5udef\tpm5udef.cmdline"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3820
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
          C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES1E03.tmp" "c:\Users\Admin\AppData\Local\Temp\tpm5udef\CSCE6FC0BCE3D7542F7A44921C62AF629.TMP"
          4⤵
            PID:4348
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4132
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4464
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2528
        • C:\Windows\SysWOW64\takeown.exe
          "C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:5000
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /inheritance:d
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:2924
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          • Suspicious use of AdjustPrivilegeToken
          PID:4300
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:1840
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:3384
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:3484
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:4272
        • C:\Windows\SysWOW64\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant BUILTIN\Administrators:RX
          3⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:5040
        • C:\Windows\SysWOW64\reg.exe
          "C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
          3⤵
            PID:1796
          • C:\Windows\SysWOW64\reg.exe
            "C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d C:\Windows\branding\mediasrv.png /f
            3⤵
            • Sets DLL path for service in the registry
            • Modifies registry key
            PID:2276
          • C:\Windows\SysWOW64\reg.exe
            "C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
            3⤵
              PID:788
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:2236
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
                4⤵
                  PID:360
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr
                3⤵
                • Suspicious use of WriteProcessMemory
                PID:2556
                • C:\Windows\SysWOW64\cmd.exe
                  cmd /c net start rdpdr
                  4⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3556
                  • C:\Windows\SysWOW64\net.exe
                    net start rdpdr
                    5⤵
                      PID:872
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 start rdpdr
                        6⤵
                          PID:4004
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\system32\cmd.exe" /c cmd /c net start TermService
                    3⤵
                      PID:5024
                      • C:\Windows\SysWOW64\cmd.exe
                        cmd /c net start TermService
                        4⤵
                          PID:3540
                          • C:\Windows\SysWOW64\net.exe
                            net start TermService
                            5⤵
                              PID:2644
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 start TermService
                                6⤵
                                  PID:4412
                          • C:\Windows\SysWOW64\cmd.exe
                            "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
                            3⤵
                              PID:948
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
                              3⤵
                                PID:1944

                          Network

                          MITRE ATT&CK Enterprise v15

                          Replay Monitor

                          Loading Replay Monitor...

                          Downloads

                          • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

                            Filesize

                            45KB

                            MD5

                            0aa395b27f460ce518edfe2f1c24c8fa

                            SHA1

                            282350fe0c3fb8da5cc36cba9c2593a1434f20f7

                            SHA256

                            94d5ed09585222e859c7d08f6fcc8a78e1c8ad6a2de473dd8b8ef33216594ef1

                            SHA512

                            ec77d45e7a44f4b8c844bde24389cec9702c173bd672090a69d1a312a793046af3bb0398bd5d6cccc068a603e496bf7795748b6706441c2d54b096950c284df9

                          • C:\Users\Admin\AppData\Local\Temp\RES1E03.tmp

                            Filesize

                            1KB

                            MD5

                            2a69173cd2683415027ecdb4aad49124

                            SHA1

                            5efe1e152e8023d9fdc0e3221568bd30e3eeaf3c

                            SHA256

                            16c875a944178652de30188f77fbf951278b7275b677bc37f32bab436a5dce2f

                            SHA512

                            f73e6ed769f8033b98453ae4d3a07a19f0536d08e0dd0275ac0511505955a3ba9370e2cc092e15b775da7a95283dba1709d1affdf8b20c3cd791a17cade11883

                          • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_m1kuidms.ob2.ps1

                            Filesize

                            60B

                            MD5

                            d17fe0a3f47be24a6453e9ef58c94641

                            SHA1

                            6ab83620379fc69f80c0242105ddffd7d98d5d9d

                            SHA256

                            96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                            SHA512

                            5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                          • C:\Users\Admin\AppData\Local\Temp\get-dnsprovider.PS1

                            Filesize

                            266KB

                            MD5

                            b2f95f4c8d5e6aff2f3ac33c73cf45a8

                            SHA1

                            b1988b2c6dfffecfdec1d778992948bbfa250f2b

                            SHA256

                            62d5570d481ce7bf2b1d280c0c38614efce5fa3f6cc4b15b8c56a8a295828c97

                            SHA512

                            69539cefa9bd209d336b87ca57755ed458750b5526f830a6af35284373d623fdcdafd24ea2c85181cc6ce210d49d5ff73f339460f792f2efee6280b5001464eb

                          • C:\Users\Admin\AppData\Local\Temp\ready.ps1

                            Filesize

                            1KB

                            MD5

                            28d9755addec05c0b24cca50dfe3a92b

                            SHA1

                            7d3156f11c7a7fb60d29809caf93101de2681aa3

                            SHA256

                            abb6ceb444b3dc29fcdcb8bda4935a6a792b85bb7049cb2710d97415d9411af9

                            SHA512

                            891a72eeef42be3f04067225a9665020704c99f9c17473ca57e5b946dfa35cb469fa91a794ea30115ce3ed0e940edb3ccff69a16a888379f5ac46a12afaa4c42

                          • C:\Users\Admin\AppData\Local\Temp\tpm5udef\tpm5udef.dll

                            Filesize

                            3KB

                            MD5

                            9f69db413161789b9fd735ad4289e7af

                            SHA1

                            e2b5e16897e9077e8ca9f93e071df9bed7831909

                            SHA256

                            bb0f7be96b6f9067a683a5abdb9bf3178019bc7299b1ca886348efbd2d311866

                            SHA512

                            e0aa83e19a5b7cbba5cd838e177d159724971868a62f08e5f8401172ebfb690105f9a22967cb1063614626601d60948403f0da577749bfa6a16200c8492ebd24

                          • C:\Windows\SysWOW64\rfxvmt.dll

                            Filesize

                            40KB

                            MD5

                            dc39d23e4c0e681fad7a3e1342a2843c

                            SHA1

                            58fd7d50c2dca464a128f5e0435d6f0515e62073

                            SHA256

                            6d9a41a03a3bd5362e3af24f97ba99d2f9927d1375e4f608942a712866d133b9

                            SHA512

                            5cb75e04ce9f5c3714e30c4fd5b8dbcd3952c3d756556dd76206111fe5b4e980c6c50209ab0914ab3afe15bd9c33ff0d49463ca11547214122859918de2a58f7

                          • \??\c:\Users\Admin\AppData\Local\Temp\tpm5udef\CSCE6FC0BCE3D7542F7A44921C62AF629.TMP

                            Filesize

                            652B

                            MD5

                            55316a5b790e192877f99213fb80ca1b

                            SHA1

                            97244622d3f50670cd0dc079e1e5a9119742e649

                            SHA256

                            044507014cb3b1d7f164e876bdce3006b7ffe5f2879615563c02db5a8624a47d

                            SHA512

                            40e6a24b2657a73cdad2e41f8a42329a83882ea01dc8d07edf1abe6f4415327ca05017a000aed40320b2e7d2718d8ba5ca50c5059fab9a140d2df47a51a49dcc

                          • \??\c:\Users\Admin\AppData\Local\Temp\tpm5udef\tpm5udef.0.cs

                            Filesize

                            424B

                            MD5

                            9f8ab7eb0ab21443a2fe06dab341510e

                            SHA1

                            2b88b3116a79e48bab7114e18c9b9674e8a52165

                            SHA256

                            e1a4fbe36125e02e100e729ce92ab74869423da87cb46da6e3c50d7c4410b2d9

                            SHA512

                            53f5dc4c853af5a412fde895635ef4b2de98a165e3546130fdd17a37a5c3b177e21eccf70a5ddf936ac491da2d7e8fcdbc1e564a95ec01b097841aa78869989b

                          • \??\c:\Users\Admin\AppData\Local\Temp\tpm5udef\tpm5udef.cmdline

                            Filesize

                            369B

                            MD5

                            cbb48c771650f82e2c26c7b0feae95ba

                            SHA1

                            a67baf71507c1ac4c0efb73923a4f0140723bd24

                            SHA256

                            a1f73274322ea6dcc7737fdad6ba2e02e9f4ef8bce16d6347b183bbf6931939b

                            SHA512

                            8c897193abd39e280be28ae88f4456c88f238a6996e53ded372430b83935f953fae3ae4f6739c26b38fab29cf537b3f1a4a64a71d10b12afc17121ed23aead2c

                          • memory/2156-8-0x0000000007E80000-0x0000000007F12000-memory.dmp

                            Filesize

                            584KB

                          • memory/2156-1-0x0000000004DD0000-0x00000000051E3000-memory.dmp

                            Filesize

                            4.1MB

                          • memory/2156-2-0x00000000051F0000-0x00000000055F2000-memory.dmp

                            Filesize

                            4.0MB

                          • memory/2156-3-0x0000000008370000-0x0000000008774000-memory.dmp

                            Filesize

                            4.0MB

                          • memory/2156-11-0x0000000009A70000-0x0000000009AD6000-memory.dmp

                            Filesize

                            408KB

                          • memory/2156-4-0x0000000000400000-0x0000000002F44000-memory.dmp

                            Filesize

                            43.3MB

                          • memory/2156-5-0x0000000007F50000-0x0000000007F60000-memory.dmp

                            Filesize

                            64KB

                          • memory/2156-6-0x0000000008770000-0x0000000008D14000-memory.dmp

                            Filesize

                            5.6MB

                          • memory/2156-10-0x0000000008D50000-0x0000000008D5A000-memory.dmp

                            Filesize

                            40KB

                          • memory/2156-68-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/2156-9-0x0000000007F50000-0x0000000007F60000-memory.dmp

                            Filesize

                            64KB

                          • memory/2156-56-0x00000000051F0000-0x00000000055F2000-memory.dmp

                            Filesize

                            4.0MB

                          • memory/2156-7-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/2156-88-0x0000000007F50000-0x0000000007F60000-memory.dmp

                            Filesize

                            64KB

                          • memory/2156-54-0x0000000004DD0000-0x00000000051E3000-memory.dmp

                            Filesize

                            4.1MB

                          • memory/2528-147-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/2528-136-0x0000000070380000-0x00000000703CC000-memory.dmp

                            Filesize

                            304KB

                          • memory/2528-137-0x00000000703D0000-0x0000000070724000-memory.dmp

                            Filesize

                            3.3MB

                          • memory/2528-134-0x0000000004BE0000-0x0000000004BF0000-memory.dmp

                            Filesize

                            64KB

                          • memory/2528-121-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/3516-17-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                            Filesize

                            64KB

                          • memory/3516-50-0x0000000006690000-0x0000000006698000-memory.dmp

                            Filesize

                            32KB

                          • memory/3516-37-0x0000000006620000-0x000000000663A000-memory.dmp

                            Filesize

                            104KB

                          • memory/3516-53-0x0000000007390000-0x00000000073BC000-memory.dmp

                            Filesize

                            176KB

                          • memory/3516-36-0x0000000007920000-0x0000000007F9A000-memory.dmp

                            Filesize

                            6.5MB

                          • memory/3516-35-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                            Filesize

                            64KB

                          • memory/3516-32-0x0000000006120000-0x000000000616C000-memory.dmp

                            Filesize

                            304KB

                          • memory/3516-31-0x00000000060D0000-0x00000000060EE000-memory.dmp

                            Filesize

                            120KB

                          • memory/3516-150-0x00000000738C0000-0x00000000738D2000-memory.dmp

                            Filesize

                            72KB

                          • memory/3516-30-0x0000000005BF0000-0x0000000005F44000-memory.dmp

                            Filesize

                            3.3MB

                          • memory/3516-148-0x0000000007650000-0x0000000007672000-memory.dmp

                            Filesize

                            136KB

                          • memory/3516-20-0x00000000058E0000-0x0000000005946000-memory.dmp

                            Filesize

                            408KB

                          • memory/3516-19-0x0000000005840000-0x0000000005862000-memory.dmp

                            Filesize

                            136KB

                          • memory/3516-18-0x0000000005210000-0x0000000005838000-memory.dmp

                            Filesize

                            6.2MB

                          • memory/3516-14-0x0000000004B00000-0x0000000004B36000-memory.dmp

                            Filesize

                            216KB

                          • memory/3516-16-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                            Filesize

                            64KB

                          • memory/3516-96-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/3516-122-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                            Filesize

                            64KB

                          • memory/3516-107-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                            Filesize

                            64KB

                          • memory/3516-15-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/3516-108-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                            Filesize

                            64KB

                          • memory/4132-55-0x0000000002950000-0x0000000002960000-memory.dmp

                            Filesize

                            64KB

                          • memory/4132-86-0x0000000004AE0000-0x0000000004AF1000-memory.dmp

                            Filesize

                            68KB

                          • memory/4132-92-0x0000000006AA0000-0x0000000006AA8000-memory.dmp

                            Filesize

                            32KB

                          • memory/4132-93-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/4132-57-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/4132-67-0x0000000002950000-0x0000000002960000-memory.dmp

                            Filesize

                            64KB

                          • memory/4132-90-0x0000000006A70000-0x0000000006A84000-memory.dmp

                            Filesize

                            80KB

                          • memory/4132-69-0x000000007F3C0000-0x000000007F3D0000-memory.dmp

                            Filesize

                            64KB

                          • memory/4132-71-0x0000000070380000-0x00000000703CC000-memory.dmp

                            Filesize

                            304KB

                          • memory/4132-72-0x00000000703D0000-0x0000000070724000-memory.dmp

                            Filesize

                            3.3MB

                          • memory/4132-89-0x00000000068A0000-0x00000000068AE000-memory.dmp

                            Filesize

                            56KB

                          • memory/4132-91-0x0000000006AB0000-0x0000000006ACA000-memory.dmp

                            Filesize

                            104KB

                          • memory/4132-82-0x00000000066D0000-0x00000000066EE000-memory.dmp

                            Filesize

                            120KB

                          • memory/4132-85-0x0000000006B10000-0x0000000006BA6000-memory.dmp

                            Filesize

                            600KB

                          • memory/4132-84-0x00000000068C0000-0x00000000068CA000-memory.dmp

                            Filesize

                            40KB

                          • memory/4132-83-0x0000000006700000-0x00000000067A3000-memory.dmp

                            Filesize

                            652KB

                          • memory/4132-70-0x0000000006690000-0x00000000066C2000-memory.dmp

                            Filesize

                            200KB

                          • memory/4464-120-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/4464-109-0x0000000070380000-0x00000000703CC000-memory.dmp

                            Filesize

                            304KB

                          • memory/4464-110-0x00000000703D0000-0x0000000070724000-memory.dmp

                            Filesize

                            3.3MB

                          • memory/4464-106-0x0000000002650000-0x0000000002660000-memory.dmp

                            Filesize

                            64KB

                          • memory/4464-94-0x0000000074DF0000-0x00000000755A0000-memory.dmp

                            Filesize

                            7.7MB

                          • memory/4464-95-0x0000000002650000-0x0000000002660000-memory.dmp

                            Filesize

                            64KB