Yara Workbench Automation

Author: David Zimmer
Date: 12.29.23 - 1:23pm

in previous posts we have talked about how to get yara workbench to spit out some analysis results using the pe.dbg feature (now the console.log class in public release yara).
rule sect_entropy
        pe.dbg("sect_entropy") and 
        for all i in (0 .. pe.number_of_sections -1):(

When I updated the yara engine to 4.3.1 I also added in a javascript automation feature. There are a couple sample automation scripts to get you started (along with a object browser and basic intellisense). Below is a quick script I used the other day to extract the seed values used in a sample set of api hashers.

if(!main.curResults) throw( new Error("No Results yet") )

hashs = {}

for(i=1; i <= main.curResults.count() ; i++){
    yf = main.curResults(i) //YaraFile class
    tmp = []
    for(j=1; j <= yf.TotalMatches();j++){
        ym = yf.matches(j ) //YaraMatch
        mr = ym.results(1) //known only one result no need to loop
        off = mr.offset //MatchResult
        seed = "0x" + tb.h(tb.uint32(off+15))
        cnt = hashs[seed]
        hashs[seed] = cnt == undefined ? 1 : cnt + 1


Seed hit counts: ")
//for(var propt in hashs){tb.t(propt + ': ' + hashs[propt]);}

Another one: (note my blog is eats some slash chars you will have to tweak)

rule = "rule test{
    strings: $keys = {8B C683 E0 030F B6 CA0F B6 80}

//file = "D:\_ftp_root_3lob4_03A41000.mem"
file = dlg.opendialog("D:\_ftp_root_3")


if(!main.curResults) throw( new Error("No Results yet") )

tmp = []
    for(i=1; i <= main.curResults.count() ; i++){
        yf = main.curResults(i) //YaraFile class
        for(j=1; j <= yf.TotalMatches();j++){
            ym = yf.matches(j) //YaraMatch
                mr = ym.results(k)  
                off = mr.offset //MatchResult
                key = "0x" + tb.h(tb.uint32(off+11))


Still need to test some of the stuff but handy addition anyway...

Comments: (0)

Leave Comment:
Email: (not shown)
Message: (Required)
Math Question: 38 + 91 = ? followed by the letter: G 

About Me
More Blogs
Main Site
Posts: (year)
2024 (1)
     vbdec backstory
2023 (4)
     Yara Workbench Automation
     VS linker versions
     IDA decompiler comments
2022 (5)
     VB6 Implements
     VB6 Stubs BS
     VB6 TypeInfo
     VB6 VTable Layout
     Yara isPCode rule
2021 (2)
     VB6 Gosub
2020 (5)
     AutoIT versions
     IDA JScript 2
     Using VB6 Obj files from C
     Yara Corrupt Imports
     Yara Undefined values
2019 (6)
     Yara WorkBench
     vb6 API and call backs
     UConnect Disable Cell Modem
2017 (5)
     IDA python over IPC
     dns wildcard blocking
     64bit IDA Plugins
     anterior lines
     misc news/updates
2016 (4)
     KANAL Mod
     Decoders again
     CDO.Message Breakpoints
     SysAnalyzer Updates
2015 (5)
     SysAnalyzer and Site Updates
     crazy decoder
     ida js w/dbg
     flash patching #2
     JS Graphing
2014 (5)
     Delphi IDA Plugin
     scdbg IDA integration
     API Hash Database
     Winmerge plugin
     IDACompare Updates
2013 (9)
     Guest Post @ hexblog
     TCP Stream Reassembly
     SysAnalyzer Updates
     Apilogger Video
     Shellcode2Exe trainer
     scdbg updates
     IDA Javascript w/IDE
     Rop Analysis II
     scdbg vrs ROP
2012 (13)
     flash patching
     x64 Hooks
     micro hook
     jmp api+5 *2
     SysAnalyzer Updates
     InjDll runtime config
     C# Asm/Dsm Library
     Shellcode Hook Detection
     Updates II
     Java Hacking
     Windows 8
     Win7 x64
2011 (19)
     Graphing ideas
     .Net Hacking
     Old iDefense Releases
     hll shellcode
     ActionScript Tips
     -patch fu
     scdbg ordinal lookup
     scdbg -api mode
     Peb Module Lists
     scdbg vrs Process Injection
     GetProcAddress Scanner
     scdbg fopen mode
     scdbg findsc mode
     scdbg MemMonitor
     demo shellcodes
     scdbg download
     api hashs redux
     Api hash gen
2010 (11)
     Retro XSS Chat Codes
     Exe as DLL
     Olly Plugins
     Debugging Explorer
     Attach to hidden process
     JS Refactoring
     Asm and Shellcode in CSharp
     Fancy Return Address
     PDF Stream Dumper
     Malcode Call API by Hash
     WinDbg Cheat Sheet
2009 (1)
     GPG Automation