Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

dynamic: emit complete features for A/W APIs #2409

Merged
merged 6 commits into from
Sep 27, 2024
Merged

dynamic: emit complete features for A/W APIs #2409

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
a5d9459
dynamic: vmray: fix A/W API detection
mike-hunhoff Sep 26, 2024
31ec208
dynamic: cape: fix A/W API detection
mike-hunhoff Sep 26, 2024
834150a
dynamic: drakvuf: fix A/W API detection
mike-hunhoff Sep 26, 2024
bfcc705
dynamic: vmray: remove redundant test
mike-hunhoff Sep 26, 2024
80e0077
dynamic: update CHANGELOG
mike-hunhoff Sep 26, 2024
ff1043e
Merge branch 'master' into fix/2408
mr-tz Sep 27, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 3 additions & 1 deletion capa/features/extractors/cape/call.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
import logging
from typing import Tuple, Iterator

import capa.features.extractors.helpers
from capa.helpers import assert_never
from capa.features.insn import API, Number
from capa.features.common import String, Feature
Expand Down Expand Up @@ -50,7 +51,8 @@ def extract_call_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -
else:
assert_never(value)

yield API(call.api), ch.address
for name in capa.features.extractors.helpers.generate_symbols("", call.api):
Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

we should update this API to accept None when the dll isn't present, not the empty string. But that can happen in another PR.

yield API(name), ch.address


def extract_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -> Iterator[Tuple[Feature, Address]]:
Expand Down
4 changes: 3 additions & 1 deletion capa/features/extractors/drakvuf/call.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
import logging
from typing import Tuple, Iterator

import capa.features.extractors.helpers
from capa.features.insn import API, Number
from capa.features.common import String, Feature
from capa.features.address import Address
Expand Down Expand Up @@ -44,7 +45,8 @@ def extract_call_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -
# but yielding the entire string would be helpful for an analyst looking at the verbose output
yield String(arg_value), ch.address

yield API(call.name), ch.address
for name in capa.features.extractors.helpers.generate_symbols("", call.name):
yield API(name), ch.address


def extract_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -> Iterator[Tuple[Feature, Address]]:
Expand Down
4 changes: 3 additions & 1 deletion capa/features/extractors/vmray/call.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
import logging
from typing import Tuple, Iterator

import capa.features.extractors.helpers
from capa.features.insn import API, Number
from capa.features.common import String, Feature
from capa.features.address import Address
Expand Down Expand Up @@ -41,7 +42,8 @@ def extract_call_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -
for param in call.params_in.params:
yield from get_call_param_features(param, ch)

yield API(call.name), ch.address
for name in capa.features.extractors.helpers.generate_symbols("", call.name):
yield API(name), ch.address


def extract_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -> Iterator[Tuple[Feature, Address]]:
Expand Down
2 changes: 2 additions & 0 deletions tests/test_cape_features.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,8 @@
),
("0000a657", "process=(1180:3052)", capa.features.common.String("nope"), False),
# thread/api calls
("0000a657", "process=(2900:2852),thread=2904", capa.features.insn.API("RegQueryValueExA"), True),
("0000a657", "process=(2900:2852),thread=2904", capa.features.insn.API("RegQueryValueEx"), True),
Copy link
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

perfect, thanks for adding tests

("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.API("NtQueryValueKey"), True),
("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.API("GetActiveWindow"), False),
# thread/number call argument
Expand Down
2 changes: 2 additions & 0 deletions tests/test_drakvuf_features.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@
("93b2d1-drakvuf", "process=(3564:4852),thread=6592", capa.features.insn.API("LdrLoadDll"), True),
("93b2d1-drakvuf", "process=(3564:4852),thread=6592", capa.features.insn.API("DoesNotExist"), False),
# call/api
("93b2d1-drakvuf", "process=(3564:4852),thread=4716,call=17", capa.features.insn.API("CreateWindowExW"), True),
("93b2d1-drakvuf", "process=(3564:4852),thread=4716,call=17", capa.features.insn.API("CreateWindowEx"), True),
("93b2d1-drakvuf", "process=(3564:4852),thread=6592,call=1", capa.features.insn.API("LdrLoadDll"), True),
("93b2d1-drakvuf", "process=(3564:4852),thread=6592,call=1", capa.features.insn.API("DoesNotExist"), False),
# call/string argument
Expand Down
5 changes: 5 additions & 0 deletions tests/test_vmray_features.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,13 @@
("93b2d1-vmray", "file", capa.features.common.String("\\Program Files\\WindowsApps\\does_not_exist"), False),
# file/imports
("93b2d1-vmray", "file", capa.features.file.Import("GetAddrInfoW"), True),
("93b2d1-vmray", "file", capa.features.file.Import("GetAddrInfo"), True),
# thread/api calls
("93b2d1-vmray", "process=(2176:0),thread=2180", capa.features.insn.API("LoadLibraryExA"), True),
("93b2d1-vmray", "process=(2176:0),thread=2180", capa.features.insn.API("LoadLibraryEx"), True),
("93b2d1-vmray", "process=(2176:0),thread=2420", capa.features.insn.API("GetAddrInfoW"), True),
("93b2d1-vmray", "process=(2176:0),thread=2420", capa.features.insn.API("GetAddrInfo"), True),
("93b2d1-vmray", "process=(2176:0),thread=2420", capa.features.insn.API("GetAddrInfo"), True),
("93b2d1-vmray", "process=(2176:0),thread=2420", capa.features.insn.API("DoesNotExist"), False),
# call/api
("93b2d1-vmray", "process=(2176:0),thread=2420,call=2361", capa.features.insn.API("GetAddrInfoW"), True),
Expand Down
Loading