eb, ed, eq (edit virtual memory)

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

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)] [pid ProcessId (hex)]

ed [Address (hex)] [Contents (hex)] [pid ProcessId (hex)]

eq [Address (hex)] [Contents (hex)] [pid ProcessId (hex)]

Description

Edits the virtual address memory contents.

Parameters

[Address (hex)]

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

[Contents (hex)]

The new contents in hex format (it could be an array).

[pid ProcessId (hex)] (optional)

The process ID in the hex format that we want to see the memory from its context (cr3).

If you don't specify the pid, then the default pid is the current process (HyperDbg) process layout of memory.

In the Debugger Mode, the pid (parameter) is ignored. If you want to view another process memory, use the '.process' command to switch to another process memory layout.

Examples

The following command is used when we want to edit the content of memory at nt!Kd_DEFAULT_Mask in a hex byte form and change it to 0xff 0xff 0xff 0xff(modify four bytes).

HyperDbg> eb nt!Kd_DEFAULT_Mask ff ff ff ff

The following command is used when we want to edit the content of memory at nt!Kd_DEFAULT_Mask+@rax+10 in a hex byte form and change it to 0xff 0xff 0xff 0xff(modify four bytes).

HyperDbg> eb nt!Kd_DEFAULT_Mask+@rax+10 ff ff ff ff

The following command is used when we want to edit the content of memory at fffff800`3ad6f010 in a hex byte form and change it to 0x90 0x90 0x90 (modify three bytes).

HyperDbg> eb fffff800`3ad6f010 90 90 90

The following example is used when we want to edit the contents of memory at fffff800`3ad6f010 in Double-word values (4 bytes), change it to 245C8948 .

HyperDbg> ed fffff800`3ad6f010 245C8948

The following example is used when we want to edit the contents of memory at fffff800`3ad6f010 in Quad-word values (8 bytes), change it to 88889898`85858686 and92929393`97979898 (16 bytes).

0: kHyperDbg> dq fffff800`3ad6f010 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.

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 physical memory)