infosec-intern / vscode-yara Goto Github PK
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License: MIT License
VSCode extension for the YARA pattern matching language
License: MIT License
Need to either manually call updateSettings(), which requires an extensioncontext, or some way of having it called. This isn't an issue when manually running tests. Previously, the Yara object took care of calling updateSettings() itself
Would be helpful to highlight invalid sequences, e.g. $ = "C:\Users"
as invalid/error syntax .
including #26
thanks!
"meta:" will lose its coloring if anything but a line break follows it
Install them along with the extension? Or just don't register commands when YARA isn't installed?
Version 1.23.0 of the API added FileSystem Providers, which allow us to treat any filesystem source as if it were on-disk
Once the CI tests are worked out, and this new version of the YARA extension is ready for release, use GitHub Actions to auto-publish updates to both marketplaces
The extension's undergone a lot of changes over the last few months, but it's still using many of the same images I created years ago. Gotta spice up the wiki and add some pizazz with fancy animated GIFs or at least up to date syntax highlighting
Testing on Firefox v97.0 Linux & Chrome v98.0 macOS
Worked in development, so I'm not sure why the features aren't registering. There might be a coverage gap in my web extension tests
Similarly to issue #13, the regex regex is too greedy with single-line comments
YARA's module system should have some kind of completion system for helping a user figure out what attributes are available
Examples of available attributes
pe.entry_point == 0x1000
cuckoo.http_request(/someregexp/)
Documentation:
https://code.visualstudio.com/docs/extensionAPI/language-support#_show-code-completion-proposals
Includes:
Logical : and | or | not
Relational : > | < | == | !=
Probably more
Probably something along the lines of support.class
or support.function
according to this textmate documentation
Off the top of my head, there are a few parts that need matching:
pe
, elf
, cuckoo
, etc.)pe.DLL
)pe.imports('')
)pe.version_info['']
)And any of the entries that need strings (e.g. dictionaries) should mark those as string.quoted.double
just like regular strings
Should be pretty straightforward - any words after a colon (:
) on the same line as a rule
rule Test : Foo Bar Baz
Syntax highlight of comments inside of a grouping doesn't work. It thinks it's part of the grouping instead of a comment. Below it an example rule and what it looks like.
rule test {
meta:
author = "Author"
description = "Description"
strings:
$instructions = {
72 ?? ?? ?? ?? // IL_0000: ldstr
80 ?? ?? 00 04 // IL_0005: stsfld
(
72 ?? ?? ?? ?? // Comment inside of a grouping
)
}
condition:
all of them
}
👋 I'm the lead maintainer of the https://github.com/github/linguist library which is used for language detection and providing the syntax highlighting for languages on GitHub.com, and we use this grammar.
Our grammar compiler has found a problem with your grammar which I thought I'd let you know about.
This regex is invalid as the lookbehind assertion is not a fixed length (offset 25):
https://regex101.com/r/v6bHBI/1
This is the error our compiler reported:
Invalid regex in grammar: source.yara
(in yara/syntaxes/yara.tmLanguage.json
) contains a malformed regex (regex "(?<=(^|[\)]|\b(?:them)\b))(?:\s*
...": lookbehind assertion is not fixed length (at offset 25))
Goto definition, peek definition, ctrl+click etc do not work with private rules.
Example below: ctrl+click on the condition my_private_rule
will not take you to the definition of my_private_rule
private rule my_private_rule
{
condition:
true
}
rule my_public_rule
{
condition:
my_private_rule
}
The publish action seems to deploy to OpenVSX just fine, but keeps getting a 401 error on VSCode's marketplace. Probably just an outdated token, but I need to address that at some point
https://github.com/infosec-intern/vscode-yara/runs/3110708909?check_suite_focus=true
compileRule attempts to run at every file save - not just .yara files. Observed when editing the settings.json files
Avast released a Language Server for Yara: https://github.com/avast/yls
Do you think we should implement it? It seems to be actively developed which this extension could profit from.
Implementation doesn't seem to hard. Avast shows a example in their extension: https://github.com/avast/yls/tree/master/editors/vscode
The first step of installing the Server could be done in an command at startup, which also checks if its up to date. The python extension does that in a similar way.
So user can has more visibility into what's happening, and I can ask for logs if something is going wrong
Filepaths need to be corrected and OS detection needs to be put in place
Regexp for (true|false) still applies when any word contains (true|false), so 'sfalse' or 'trues' will highlight (true|false) inside the word
YARA Help Menu
YARA 3.5.0, the pattern matching swiss army knife.
Usage: yara [OPTION]... RULES_FILE FILE | DIR | PID
Mandatory arguments to long options are mandatory for short options too.
-t, --tag=TAG print only rules tagged as TAG
-i, --identifier=IDENTIFIER print only rules named IDENTIFIER
-n, --negate print only not satisfied rules (negate)
-D, --print-module-data print module data
-g, --print-tags print tags
-m, --print-meta print metadata
-s, --print-strings print matching strings
-e, --print-namespace print rules' namespace
-p, --threads=NUMBER use the specified NUMBER of threads to scan a directory
-l, --max-rules=NUMBER abort scanning after matching a NUMBER of rules
-d VAR=VALUE define external variable
-x MODULE=FILE pass FILE's content as extra data to MODULE
-a, --timeout=SECONDS abort scanning after the given number of SECONDS
-k, --stack-size=SLOTS set maximum stack size (default=16384)
-r, --recursive recursively search directories
-f, --fast-scan fast matching mode
-w, --no-warnings disable warnings
-v, --version show version information
-h, --help show this help and exit
Send bug reports and suggestions to: [email protected].
YARAC Help Menu
Usage: yarac [OPTION]... [NAMESPACE:]SOURCE_FILE... OUTPUT_FILE
-d VAR=VALUE define external variable
-w, --no-warnings disable warnings
-v, --version show version information
-h, --help show this help and exit
Send bug reports and suggestions to: [email protected].
The invalid.illegal.missing.escape.yara
regex is incorrectly matching against escape sequences (\n
, \t
, etc.) and not identifying invalid escapes when placed next to a correctly escaped slash.
Note: ASCII Escape Sequences
{
"name": "invalid.illegal.missing.escape.yara",
"match": "[^\\\\]\\\\[^\\\\\"]"
}
Example rule from signature-base
Test strings from invalid.yar
The constant.numeric.jump.range.yara
matcher doesn't identify constant jumps (e.g. [4]
) as numeric due to the dash requirement
{
"name": "constant.numeric.jump.range.yara",
"begin": "\\[",
"end": "\\]",
"match": "[0-9]*-[0-9]*"
}
Example rule from signature-base
Currently I'm only providing definitions for rules. If a symbol starts with one of 4 characters, then treat it as a variable and look for the line $variable =
$, #, @, !
Reference: http://yara.readthedocs.io/en/v3.7.0/writingrules.html#conditions
I think the repo name can be updated.
Idea time: Translate configuration entries into rule metadata
Possible entries and translations:
"metadata": {
"author": "infosec-intern",
"confidence": 100,
"reference": "",
"created": "$now", // maybe I'll calculate and add this regardless when a new .yara file is created
"modified": "$now" // updated on every save
}
An information messagebox isn't good enough
YARA output on a successful rule detection is like this:
${Rulename} ${Target filename}
Thank you for being part of the Open VSX community by adding your extensions to the Open VSX Registry. Please note that the service was recently transferred to the Eclipse Foundation and urgent action on your part is needed so we can continue to list your extensions. To ensure uninterrupted service, please sign the Eclipse Publisher Agreement on or before January 8, 2021. If not signed by that date, your extensions will be delisted and will no longer appear on the site nor be available via the API. If you sign at a later date, your extensions will then be re-activated. The signing process is explained in the Wiki (steps 1 and 2).
Please also note that all extensions MUST have a license in order to be listed.
More details are in these recent blog posts:
https://blogs.eclipse.org/post/brian-king/open-vsx-registry-under-new-management
https://blogs.eclipse.org/post/brian-king/new-era-open-vsx-registry
Today, there’s growing momentum around open source tools and technologies that support Visual Studio (VS) Code extensions. Leading global organizations are adopting these tools and technologies. This momentum has spurred demand for a marketplace without restrictions and limitations. Thanks for joining us on this journey as we continue to build the Open VSX community. We look forward to continued innovation from you in 2021!
Hey,
I love the YARA syntax highlighting library you provide and thanks for coding it!
In more recent versions you have added a snippet for a rule like this:
{
"Rule": {
"prefix": "rule",
"body": [
"/",
"\tRULE DESCRIPTION HERE",
"/",
"rule ${name}",
"{",
"\tcondition:",
"\t\t$1",
"}"
],
"description": "Generate a basic skeleton"
},
"Meta": {
"prefix": "meta",
"body": [
"meta:",
"\t${metadata}"
],
"description": "Generate a 'meta' section"
},
"Strings": {
"prefix": "strings",
"body": [
"strings:",
"\t${string(s)}"
],
"description": "Generate a 'strings' section"
},
"Import": {
"prefix": "import",
"body": "import "${module}"",
"description": "Import a YARA module"
}
}
Whenever VSCode updates, this overrides the default snippet I had created myself for rules which prepopulates metadata sections etc.
Would you consider removing the rule snippet, and instead leave it to users to define their own snippets?
Cheers,
Tom
The following rule should return references for $create0
and $create1
if $create*
is used. I'll probably only limit this to the local rule scope though so it doesn't go too crazy
rule suspicious_creation : PDF raw
{
meta:
author = "Glenn Edwards (@hiddenillusion)"
version = "0.1"
weight = 2
strings:
$magic = { 25 50 44 46 }
$header = /%PDF-1\.(3|4|6)/
$create0 = /CreationDate \(D:20101015142358\)/
$create1 = /CreationDate \(2008312053854\)/
condition:
$magic at 0 and $header and 1 of ($create*)
}
Need this because we're spawning asyn processes which may not return immediately
Hopefully this helps the unit testing as well
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