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description
Description of '!eb, !ed, !eq' commands in HyperDbg.

!eb, !ed, !eq (edit physical memory)

Command

!eb : edit memory as Byte values

!ed : edit memory as Double-word values (4 bytes)

!eq : edit memory as Quad-word values (8 bytes)

Syntax

!eb [Address (hex)] [Contents (hex)]

!ed [Address (hex)] [Contents (hex)]

!eq [Address (hex)] [Contents (hex)]

Description

Edits the physical address memory contents.

Parameters

[Address (hex)]

The physical address of where we want to edit its memory.

[Contents (hex)]

The new contents in hex format.

{% hint style="danger" %} Process ID doesn't make sense in physical memory. If you specify pid for physical memory, it is ignored. {% endhint %}

Examples

The following command is used when we want to edit the content of physical memory at 1000 in a hex byte form and change it to 0x90 0x90 0x90 (modify three bytes).

HyperDbg> !eb 1000 90 90 90

The following example is used when we want to edit the contents of physical memory at 1000 in Double-word values (4 bytes), change it to 245C8948 .

HyperDbg> !ed 1000 245C8948

The following example is used when we want to edit the contents of physical memory at @rax+@rbx+5 in Double-word values (4 bytes), change it to 245C8948 .

HyperDbg> !ed @rax+@rbx+5 245C8948

The following example is used when we want to edit the contents of physical memory at 1000 in Quad-word values (8 bytes), change it to 88889898`85858686 and92929393`97979898 (16 bytes).

0: kHyperDbg> !dq 1000 88889898`85858686 92929393`97979898

SDK

To write the memory in the target debuggee, you need to use the following function in libhyperdbg:

BOOLEAN
hyperdbg_u_write_memory(PVOID                     destination_address,
                        DEBUGGER_EDIT_MEMORY_TYPE memory_type,
                        UINT32                    process_id,
                        PVOID                     source_address,
                        UINT32                    number_of_bytes);

Remarks

  • You can change as many bytes as you need in byte, dword, and qword formats. Just add new values to the end of the command.

If you change the memory address that you previously set a breakpoint using the 'bp' command, the previous value is replaced when you remove the breakpoint.

{% hint style="info" %} Physical addresses are not validated in HyperDbg, which means if you access an invalid physical address, then the debuggee halts or crashes. {% endhint %}

This command is guaranteed to keep debuggee in a halt state (in Debugger Mode); thus, nothing will change during its execution.

Requirements

None

Related

eb, ed, eq (edit virtual memory)