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refactor: rework carrier/payload location calculation

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Dobin
2024-07-06 21:23:09 +01:00
parent 6d05779c7c
commit 7847b8d40e
3 changed files with 63 additions and 25 deletions
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phases/injector.py
+58 -24
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@@ -45,30 +45,62 @@ class Injector():
def init_addresses(self):
rm = self.superpe.get_code_rangemanager()
if self.settings.payload_location == PayloadLocation.CODE:
#. text
# ┌───────────┬─────────────────────────────────────┬───────┐
# │ ├────────┼────────┼───────────────────┤ │
# │ │Carrier │ 1 Page │ Payload │ │
# │ ├────────┼────────┼───────────────────┤ │
# └───────────┴─────────────────────────────────────┴───────┘
#
# Payload is page aligned when used with dll_loader_change
# TECHNIQUE0:
# assume payload is big, find a place for it, then prepend carrier (small)
complete_size = len(self.carrier_shc) + len(self.payload.payload_data) + 4096
# carrier location
complete_size = len(self.carrier_shc) + 4096 + len(self.payload.payload_data)
rm = self.superpe.get_code_rangemanager()
largest_gap = rm.find_holes(complete_size)
if len(largest_gap) == 0:
raise Exception('No hole found in code section to fit payload!')
largest_gap_size = largest_gap[0][1] - largest_gap[0][0]
offset = int((largest_gap_size - complete_size) / 2) # centered in the .text section
offset += largest_gap[0][0]
self.carrier_rva = self.superpe.get_code_section().VirtualAddress + offset
largest_gap = rm.find_holes(complete_size)
if len(largest_gap) == 0:
raise Exception('No hole found in code section to fit payload!')
largest_gap_size = largest_gap[0][1] - largest_gap[0][0]
# payload location: behind carrier + 1 page
if self.settings.carrier_name == "dll_loader_change":
self.payload_rva = self.carrier_rva + len(self.carrier_shc) + 4096 + 4096
self.payload_rva = self.payload_rva & 0xFFFFF000 # page align
else:
# no page align
self.payload_rva = self.carrier_rva + len(self.carrier_shc) + 4096
else:
# .text .rdata
# ┌─────────┬─────────┬───────┐ ┌────────┬─────────┬───────┐
# │ │ │ │ │ │ │ │
# │ │ carrier │ │ │ │payload │ │
# │ │ │ │ │ │ │ │
# └─────────┴─────────┴───────┘ └────────┴─────────┴───────┘
# align to center
offset = int((largest_gap_size - complete_size) / 2) # centered in the .text section
offset += largest_gap[0][0]
# carrier location
rm = self.superpe.get_code_rangemanager()
complete_size = len(self.carrier_shc)
largest_gap = rm.find_holes(complete_size)
if len(largest_gap) == 0:
raise Exception('No hole found in code section to fit payload!')
largest_gap_size = largest_gap[0][1] - largest_gap[0][0]
offset = int((largest_gap_size - complete_size) / 2) # centered in the .text section
offset += largest_gap[0][0]
self.carrier_rva = self.superpe.get_code_section().VirtualAddress + offset
if self.settings.carrier_name == "dll_loader_change":
# Align to page size
offset = offset & 0xFFFFF000
# page aligned possibly
self.payload_rva = offset
# prepend it a bit
self.carrier_rva = offset - len(self.payload.payload_data) - 4096
# payload location
rdata_rm = self.superpe.get_rdata_rangemanager()
complete_size = len(self.payload.payload_data)
largest_gap = rdata_rm.find_holes(complete_size)
if len(largest_gap) == 0:
raise Exception('No hole found in code section to fit payload!')
largest_gap_size = largest_gap[0][1] - largest_gap[0][0]
offset = largest_gap[0][0]
self.payload_rva = self.superpe.get_section_by_name(".rdata").virt_addr + offset
## Inject
@@ -105,6 +137,9 @@ class Injector():
else: # EXE/DLL
carrier_offset = self.superpe.get_offset_from_rva(self.carrier_rva)
if carrier_offset == None:
raise Exception("Carrier Offset is None, invalid carrier RVA? 0x{:X}".format(self.carrier_rva))
#logger.info("{} {}".format(self.carrier_rva, carrier_offset))
logger.info("--[ Inject: Write Carrier to 0x{:X} (0x{:X})".format(
self.carrier_rva, carrier_offset))
@@ -219,8 +254,6 @@ class Injector():
# nothing todo
return
shellcode_offset = self.superpe.pe.get_offset_from_rva(self.payload_rva)
# insert data
logger.info("---( DataReuseFixups: Inject the data")
for datareuse_fixup in reusedata_fixups:
@@ -228,6 +261,7 @@ class Injector():
datareuse_fixup.string_ref, datareuse_fixup.in_code))
if datareuse_fixup.in_code: # .text
shellcode_offset = self.superpe.pe.get_offset_from_rva(self.payload_rva)
self.superpe.pe.set_bytes_at_offset(shellcode_offset, datareuse_fixup.data)
payload_rva = self.superpe.pe.get_rva_from_offset(shellcode_offset)
datareuse_fixup.addr = payload_rva + self.injectable.superpe.get_image_base()
@@ -272,8 +306,8 @@ class Injector():
)
asm_disasm(lea, instruction_virtual_address) # DEBUG
if len(lea) != len(ref.placeholder):
raise Exception("DataReuseFixup: lea instr has different length than placeholder: {} != {} abort".format(
len(lea), len(ref.placeholder)
raise Exception("DataReuseFixup: lea instr has different length than placeholder {}: {} != {} abort".format(
ref.placeholder, len(lea), len(ref.placeholder)
))
code = code.replace(ref.placeholder, lea)