Searching for values in memory

Searching for values in a range of memory at a single context

If the value you are looking for might be in a range of memory at a specific point in the trace, you can search it with the following:

pattern = bytearray([0x77, 0x43])
for match_address in ctx.search_in_memory(pattern,
                                          ctx.read(regs.rsp), 0x1000000):
     print(f"'{pattern}' is found starting at @{match_address}")

Searching for string-like values accessed in the trace

Reven v2.2.0

If the value you are looking for looks like a string indexed by the strings resource (defaults to strings of printable characters of length 5-128, possibly UTF-16 encoded), then you can use the strings search API, which will be the fastest way:

from_tr = server.trace.first_transition
to_tr = server.trace.last_transition

for string in server.trace.strings("Network"):
    for access in string.memory_accesses(from_tr, to_tr):
        print(access)

Sample output:

[#4653465 mov word ptr [rcx], ax]Write access at @phy:0x18e8252c (virtual address: lin:0x3a252c) of size 2
[#4653475 mov word ptr [rcx], ax]Write access at @phy:0x18e8252e (virtual address: lin:0x3a252e) of size 2
[#4653485 mov word ptr [rcx], ax]Write access at @phy:0x18e82530 (virtual address: lin:0x3a2530) of size 2
[#4653495 mov word ptr [rcx], ax]Write access at @phy:0x18e82532 (virtual address: lin:0x3a2532) of size 2
[#4653505 mov word ptr [rcx], ax]Write access at @phy:0x18e82534 (virtual address: lin:0x3a2534) of size 2
[#4653515 mov word ptr [rcx], ax]Write access at @phy:0x18e82536 (virtual address: lin:0x3a2536) of size 2
[#4653525 mov word ptr [rcx], ax]Write access at @phy:0x18e82538 (virtual address: lin:0x3a2538) of size 2
[#4653535 mov word ptr [rcx], ax]Write access at @phy:0x18e8253a (virtual address: lin:0x3a253a) of size 2
[#4653545 mov word ptr [rcx], ax]Write access at @phy:0x18e8253c (virtual address: lin:0x3a253c) of size 2
[#4653555 mov word ptr [rcx], ax]Write access at @phy:0x18e8253e (virtual address: lin:0x3a253e) of size 2
[#4653565 mov word ptr [rcx], ax]Write access at @phy:0x18e82540 (virtual address: lin:0x3a2540) of size 2
[#4653575 mov word ptr [rcx], ax]Write access at @phy:0x18e82542 (virtual address: lin:0x3a2542) of size 2
[#4653585 mov word ptr [rcx], ax]Write access at @phy:0x18e82544 (virtual address: lin:0x3a2544) of size 2
[#4653595 mov word ptr [rcx], ax]Write access at @phy:0x18e82546 (virtual address: lin:0x3a2546) of size 2
[#4653605 mov word ptr [rcx], ax]Write access at @phy:0x18e82548 (virtual address: lin:0x3a2548) of size 2
[#4653615 mov word ptr [rcx], ax]Write access at @phy:0x18e8254a (virtual address: lin:0x3a254a) of size 2
[#4653625 mov word ptr [rcx], ax]Write access at @phy:0x18e8254c (virtual address: lin:0x3a254c) of size 2
Unaccessed values are not found by this method

This method only finds values in memory that are accessed (read from, written to) during the portion of the trace where the search takes place.

If you don't know if your value is accessed in the trace, you can associate this method with a search in memory at a context.

Searching for other kinds of values accessed in the trace

Reven v2.6.0
from_ctx = server.trace.first_context
to_ctx = server.trace.last_context

for match in server.trace.search.memory(b"\xc0\xfc\x75\x02", from_ctx, to_ctx).matches():
    print(match)

Sample output:

id: 0 | @lin:0xab600 (mapped at Context before #5665813) | [Context before #5665813 - Context after #16899165] | 1 access(es)
id: 1 | @lin:0xbadf0 (mapped at Context before #5666826) | [Context before #5666826 - Context after #16899165] | 1 access(es)
id: 2 | @lin:0xac810 (mapped at Context before #5666966) | [Context before #5666966 - Context before #6141251] | 1 access(es)
id: 3 | @lin:0xb0935 (mapped at Context before #6140550) | [Context before #6140550 - Context after #16899165] | 1 access(es)
id: 4 | @lin:0xab790 (mapped at Context before #6143172) | [Context before #6143172 - Context after #16899165] | 1 access(es)
id: 5 | @lin:0xffffe0016aec9800 (mapped at Context before #6144279) | [Context before #6144279 - Context before #6379441] | 2 access(es)
id: 6 | @lin:0xffffe0016a7accc0 (mapped at Context before #6152909) | [Context before #6152909 - Context before #6372050] | 1 access(es)
id: 7 | @lin:0xc7e605 (mapped at Context before #6218204) | [Context before #6218204 - Context after #16899165] | 15 access(es)
id: 8 | @lin:0xc67780 (mapped at Context before #6235773) | [Context before #6235773 - Context after #16899165] | 10 access(es)
id: 9 | @lin:0x29feb26 (mapped at Context before #6360085) | [Context before #6360085 - Context before #6360107] | 2 access(es)
id: 10 | @lin:0x29feb26 (mapped at Context before #6360108) | [Context before #6360108 - Context before #6360254] | 3 access(es)
id: 11 | @lin:0x29feb26 (mapped at Context before #6360255) | [Context before #6360255 - Context after #16899165] | 2 access(es)
id: 12 | @lin:0x29feb06 (mapped at Context before #6360265) | [Context before #6360265 - Context before #6360264] | 0 access(es)
id: 13 | @lin:0x29feb06 (mapped at Context before #6360265) | [Context before #6360265 - Context after #16899165] | 2 access(es)
id: 14 | @lin:0x29fe946 (mapped at Context before #6360440) | [Context before #6360440 - Context before #6360439] | 0 access(es)
id: 15 | @lin:0x29fe946 (mapped at Context before #6360440) | [Context before #6360440 - Context before #6360458] | 2 access(es)
Unaccessed values are not found by this method

This method only finds values in memory that are accessed (read from, written to) during the portion of the trace where the search takes place.

If you don't know if your value is accessed in the trace, you can associate this method with a search in memory at a context.