UEFIVAR

help.txt

An "italian" army knife to manage UEFI variables in Windows.
V1.2 (C) 2019 by Zibri http://www.zibri.org

UEFIVAR [-l] [-sg] [-sn] [-G:"GUID"] [-N:"NAME"] [-hd] [-bd[[:]["filename"]]] [-D] [-WB64:b64data]
        [-A:"ATTRIBUTES"] [-b64[[:]["filename"]]] [-I:"filename"] [-i:"filename"] [-WHEX:hexstring]
        [-APPEND] [-h] [-m]

  -l                     Lists all UEFI variables.
  -l -sg                 Sorts variables by their GUIDs.
  -l -sn                 Sorts variables by their names.
  -G:"GUID"              Specifies the variable GUID.
  -N:"Name"              Specifies the variable name.
  -A:"xx"                Specifies the variable attribute.
  -hd                    Dumps the content of the variable(s) in Hex.
  -bd[[:]["filename"]]   Dumps the content of the variable(s) in Binary file.
  -b64[[:]["filename"]]  Dumps the content of the variable(s) in Base64.
  -I:"fname"             Imports from binary or base64 file (need GUID and NAME).
  -i:"fname"             Imports from binary or base64 file (using filename).
  -D                     Deletes the variable (DANGEROUS!)
  -WB64:"b64data"        Writes the variable data (creating the variable if needed).
  -WHEX:"hex string"     Writes the variable data (creating the variable if needed).
  -APPEND                Appends the data to the existing variable.
  -h/-H                  Show this help sheet.
  -m/-M                  Manual with examples.
  -z                     Donate (please donate more than $2 or PayPal will take it all)

manual.txt

An "italian" army knife to manage UEFI variables in Windows.
V1.2 (C) 2019 by Zibri http://www.zibri.org

UEFIVAR [-l [-sg] [-sn]] [-G:"GUID"] [-N:"NAME"] [-hd] [-bd[[:]["filename"]]] [-D] [-WB64:b64data]
        [-A:"ATTRIBUTES"] [-b64[[:]["filename"]]] [-I:"filename"] [-i:"filename"] [-WHEX:hexstring]
        [-APPEND] [-h] [-m]

Examples:
uefivar -l -bd     Dumps all UEFI variables in binary format in the current directory.
uefivar -l -hd     Hex-dumps all UEFI variables in the current console.
uefivar -l -b64    Dumps all UEFI variables in base64 format in the current console.
uefivar -l -b64:   Dumps all UEFI variables in base64 format in the current directory.

Dump a variable on screen in hex:
uefivar -G:"8be4df61-93ca-11d2-aa0d-00e098032b8c" -N:"BootCurrent" -hd

Dump a variable on screen in base64:
uefivar -G:"8be4df61-93ca-11d2-aa0d-00e098032b8c" -N:"BootCurrent" -b64

Dump a variable on disk in binary and automatic name:
uefivar -G:"8be4df61-93ca-11d2-aa0d-00e098032b8c" -N:"BootCurrent" -bd

Dump a variable on disk in binary and custom name:
uefivar -G:"8be4df61-93ca-11d2-aa0d-00e098032b8c" -N:"BootCurrent" -bd:"bc.bin"

Import a variable from binary file (automatic):
uefivar -i:"8be4df61-93ca-11d2-aa0d-00e098032b8c-BootCurrent (BS+RT).bin"

Create a variable (base64):
uefivar -G:"12345678-1234-1234-1234-123456789012" -N:"Zibri" -WB64:"AQ==" -A:"NV"

Create a variable (hex):
uefivar -G:"12345678-1234-1234-1234-123456789012" -N:"Zibri" -WHEX:"01020304" -A:"NV"

Delete a variable:
uefivar -G:"12345678-1234-1234-1234-123456789012" -N:"Zibri" -D

Automatic import from disk of a saved binary variable:
uefivar -i:"12345678-1234-1234-1234-123456789012-Zibri (NV+BS+RT).bin"

Dump a variable on disk in base64 automatic mode:
uefivar -G:"12345678-1234-1234-1234-123456789012" -N:"Zibri" -b64:

Manual import of a variable saved in an arbitrary binary file:
uefivar -G:"12345678-1234-1234-1234-123456789012" -N:"Zibri" -I:"zibri.bin"

UEFIVAR.EXE

Hey @Zibri, thank you very much for this tool. You've mentioned a couple of times that more advanced use cases would need usage of the UEFI Shell, but I can't find information about how to launch it on my machine. Do you have any idea how I could invoke it? Thanks again :)

@Tachi107 it depends on your system BIOS AND your OS... a quick way is to install refind and find a suitable "shell.efi" for your system.. then you can just run "shell.efi" from bios even without refind.
But be very careful to what you do, because you can seriously mess up your system.

Il giorno mer 4 gen 2023 alle 11:52:12 -08:00:00, Zibri ***@***.***> ha scritto:

@Tachi107 it depends on your system BIOS AND your OS... a quick way is to install refind and find a suitable "shell.efi" for your system.. then you can just run "shell.efi" from bios even without refind.

Thanks for the reply, I hadn't thought about using rEFInd. In the meantime I also figured I could try using Tianocore's EDK II EFI shell, just in case my old laptop firmware doesn't provide a shell. Thanks again :)

Hello,

I just discovered this tool.
Is it possible to extract, let's say, boot logo (bmp) and replace with another one in EFI image (not BIN)?

@zhangyoufu

1. you are not very clever and very bad at reverisng software.
2. the http request is just for statistics.
3. it has been obfucated only to make it more difficult to be used as a "weapon".
4. nobody cares if one paranoid does not use it. Hundreds of downloads prove otherwise.

This is malware.

This is malware.

NO, THIS IS NOT.
And this kind of comments is what you get when you offer something for free to morons.