SYMBOLCOMMON_NAMEaka. SYNONYMS
win.formbook (Back to overview)

Formbook

aka: win.xloader

Actor(s): SWEED, Cobalt

URLhaus        

FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware.

References
2021-09-30BlackberryThe BlackBerry Research & Intelligence Team
@online{team:20210930:threat:d31cc55, author = {The BlackBerry Research & Intelligence Team}, title = {{Threat Thursday: xLoader Infostealer}}, date = {2021-09-30}, organization = {Blackberry}, url = {https://blogs.blackberry.com/en/2021/09/threat-thursday-xloader-infostealer}, language = {English}, urldate = {2021-10-11} } Threat Thursday: xLoader Infostealer
Xloader Formbook
2021-09-29Trend MicroAliakbar Zahravi, William Gamazo Sanchez, Kamlapati Choubey, Peter Girnus
@online{zahravi:20210929:formbook:54b9f08, author = {Aliakbar Zahravi and William Gamazo Sanchez and Kamlapati Choubey and Peter Girnus}, title = {{FormBook Adds Latest Office 365 0-Day Vulnerability (CVE-2021-40444) to Its Arsenal}}, date = {2021-09-29}, organization = {Trend Micro}, url = {https://www.trendmicro.com/en_us/research/21/i/formbook-adds-latest-office-365-0-day-vulnerability-cve-2021-404.html}, language = {English}, urldate = {2021-10-05} } FormBook Adds Latest Office 365 0-Day Vulnerability (CVE-2021-40444) to Its Arsenal
Formbook
2021-07-21Quick HealRumana Siddiqui
@online{siddiqui:20210721:formbook:e6e3f64, author = {Rumana Siddiqui}, title = {{FormBook Malware Returns: New Variant Uses Steganography and In-Memory Loading of multiple stages to steal data}}, date = {2021-07-21}, organization = {Quick Heal}, url = {https://blogs.quickheal.com/formbook-malware-returns-new-variant-uses-steganography-and-in-memory-loading-of-multiple-stages-to-steal-data/}, language = {English}, urldate = {2021-07-26} } FormBook Malware Returns: New Variant Uses Steganography and In-Memory Loading of multiple stages to steal data
Formbook
2021-07-12IBMMelissa Frydrych, Claire Zaboeva, Dan Dash
@online{frydrych:20210712:roboski:1f66418, author = {Melissa Frydrych and Claire Zaboeva and Dan Dash}, title = {{RoboSki and Global Recovery: Automation to Combat Evolving Obfuscation}}, date = {2021-07-12}, organization = {IBM}, url = {https://securityintelligence.com/posts/roboski-global-recovery-automation/}, language = {English}, urldate = {2021-07-20} } RoboSki and Global Recovery: Automation to Combat Evolving Obfuscation
404 Keylogger Agent Tesla AsyncRAT Ave Maria Azorult BitRAT Formbook HawkEye Keylogger Loki Password Stealer (PWS) Nanocore RAT NetWire RC NjRAT Quasar RAT RedLine Stealer Remcos
2021-07-12Cipher Tech SolutionsMelissa Frydrych, Claire Zaboeva, Dan Dash
@online{frydrych:20210712:roboski:a3c66bf, author = {Melissa Frydrych and Claire Zaboeva and Dan Dash}, title = {{RoboSki and Global Recovery: Automation to Combat Evolving Obfuscation}}, date = {2021-07-12}, organization = {Cipher Tech Solutions}, url = {https://www.ciphertechsolutions.com/roboski-global-recovery-automation/}, language = {English}, urldate = {2021-07-20} } RoboSki and Global Recovery: Automation to Combat Evolving Obfuscation
404 Keylogger Agent Tesla AsyncRAT Ave Maria Azorult BitRAT Formbook HawkEye Keylogger Loki Password Stealer (PWS) Nanocore RAT NetWire RC NjRAT Quasar RAT RedLine Stealer Remcos
2021-04-22FortinetXiaopeng Zhang
@online{zhang:20210422:deep:44cd560, author = {Xiaopeng Zhang}, title = {{Deep Analysis: FormBook New Variant Delivered in Phishing Campaign – Part II}}, date = {2021-04-22}, organization = {Fortinet}, url = {https://www.fortinet.com/blog/threat-research/deep-analysis-formbook-new-variant-delivered-phishing-campaign-part-ii}, language = {English}, urldate = {2021-04-28} } Deep Analysis: FormBook New Variant Delivered in Phishing Campaign – Part II
Formbook
2021-04-12FortinetXiaopeng Zhang
@online{zhang:20210412:deep:dc35f85, author = {Xiaopeng Zhang}, title = {{Deep Analysis: New FormBook Variant Delivered in Phishing Campaign – Part I}}, date = {2021-04-12}, organization = {Fortinet}, url = {https://www.fortinet.com/blog/threat-research/deep-analysis-new-formbook-variant-delivered-phishing-campaign-part-I}, language = {English}, urldate = {2021-04-14} } Deep Analysis: New FormBook Variant Delivered in Phishing Campaign – Part I
Formbook
2021-03-17HPHP Bromium
@techreport{bromium:20210317:threat:3aed551, author = {HP Bromium}, title = {{Threat Insights Report Q4-2020}}, date = {2021-03-17}, institution = {HP}, url = {https://threatresearch.ext.hp.com/wp-content/uploads/2021/03/HP_Bromium_Threat_Insights_Report_Q4_2020.pdf}, language = {English}, urldate = {2021-03-19} } Threat Insights Report Q4-2020
Agent Tesla BitRAT ComodoSec Dridex Emotet Ficker Stealer Formbook Zloader
2021-03-11YouTube ( Malware_Analyzing_&_RE_Tips_Tricks)Jiří Vinopal
@online{vinopal:20210311:formbook:31931b9, author = {Jiří Vinopal}, title = {{Formbook Reversing - Part1 [Formbook .NET loader/injector analyzing, decrypting, unpacking, patching]}}, date = {2021-03-11}, organization = {YouTube ( Malware_Analyzing_&_RE_Tips_Tricks)}, url = {https://youtu.be/aQwnHIlGSBM}, language = {English}, urldate = {2021-03-12} } Formbook Reversing - Part1 [Formbook .NET loader/injector analyzing, decrypting, unpacking, patching]
Formbook
2021-01-09Marco Ramilli's BlogMarco Ramilli
@online{ramilli:20210109:command:d720b27, author = {Marco Ramilli}, title = {{Command and Control Traffic Patterns}}, date = {2021-01-09}, organization = {Marco Ramilli's Blog}, url = {https://marcoramilli.com/2021/01/09/c2-traffic-patterns-personal-notes/}, language = {English}, urldate = {2021-05-17} } Command and Control Traffic Patterns
ostap LaZagne Agent Tesla Azorult Buer Cobalt Strike DanaBot DarkComet Dridex Emotet Formbook IcedID ISFB NetWire RC PlugX Quasar RAT SmokeLoader TrickBot
2020-11-19SANS ISC InfoSec ForumsXavier Mertens
@online{mertens:20201119:powershell:72b44bf, author = {Xavier Mertens}, title = {{PowerShell Dropper Delivering Formbook}}, date = {2020-11-19}, organization = {SANS ISC InfoSec Forums}, url = {https://isc.sans.edu/diary/26806}, language = {English}, urldate = {2020-11-19} } PowerShell Dropper Delivering Formbook
Formbook
2020-11-05tccontre Blogtcontre
@online{tcontre:20201105:interesting:17c82b2, author = {tcontre}, title = {{Interesting FormBook Crypter - unconventional way to store encrypted data}}, date = {2020-11-05}, organization = {tccontre Blog}, url = {https://tccontre.blogspot.com/2020/11/interesting-formbook-crypter.html}, language = {English}, urldate = {2020-11-06} } Interesting FormBook Crypter - unconventional way to store encrypted data
Formbook
2020-10-16HornetsecurityHornetsecurity Security Lab
@online{lab:20201016:vba:577dd47, author = {Hornetsecurity Security Lab}, title = {{VBA Purging Malspam Campaigns}}, date = {2020-10-16}, organization = {Hornetsecurity}, url = {https://www.hornetsecurity.com/en/threat-research/vba-purging-malspam-campaigns/}, language = {English}, urldate = {2020-12-08} } VBA Purging Malspam Campaigns
Agent Tesla Formbook
2020-07-29ESET Researchwelivesecurity
@techreport{welivesecurity:20200729:threat:496355c, author = {welivesecurity}, title = {{THREAT REPORT Q2 2020}}, date = {2020-07-29}, institution = {ESET Research}, url = {https://www.welivesecurity.com/wp-content/uploads/2020/07/ESET_Threat_Report_Q22020.pdf}, language = {English}, urldate = {2020-07-30} } THREAT REPORT Q2 2020
DEFENSOR ID HiddenAd Bundlore Pirrit Agent.BTZ Cerber ClipBanker CROSSWALK Cryptowall CTB Locker DanaBot Dharma Formbook Gandcrab Grandoreiro Houdini ISFB LockBit Locky Mailto Maze Microcin Nemty NjRAT Phobos PlugX Pony REvil Socelars STOP Tinba TrickBot WannaCryptor
2020-07-22S2W LAB Inc.S2W LAB INTELLIGENCE TEAM
@online{team:20200722:formbook:6297801, author = {S2W LAB INTELLIGENCE TEAM}, title = {{'FormBook Tracker' unveiled on the Dark Web}}, date = {2020-07-22}, organization = {S2W LAB Inc.}, url = {https://drive.google.com/file/d/1oxINyIJfMtv_upJqRK9vLSchIBaU8wiU/view}, language = {English}, urldate = {2020-08-14} } 'FormBook Tracker' unveiled on the Dark Web
Formbook
2020-05-31Malwarebyteshasherezade
@online{hasherezade:20200531:revisiting:cb8df95, author = {hasherezade}, title = {{Revisiting the NSIS-based crypter}}, date = {2020-05-31}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2021/05/revisiting-the-nsis-based-crypter/}, language = {English}, urldate = {2021-06-09} } Revisiting the NSIS-based crypter
Formbook
2020-05-14SophosLabsMarkel Picado
@online{picado:20200514:raticate:6334722, author = {Markel Picado}, title = {{RATicate: an attacker’s waves of information-stealing malware}}, date = {2020-05-14}, organization = {SophosLabs}, url = {https://news.sophos.com/en-us/2020/05/14/raticate/}, language = {English}, urldate = {2020-05-18} } RATicate: an attacker’s waves of information-stealing malware
Agent Tesla BetaBot BlackRemote Formbook Loki Password Stealer (PWS) NetWire RC NjRAT Remcos
2020-04-01CiscoShyam Sundar Ramaswami, Andrea Kaiser
@online{ramaswami:20200401:navigating:965952a, author = {Shyam Sundar Ramaswami and Andrea Kaiser}, title = {{Navigating Cybersecurity During a Pandemic: Latest Malware and Threat Actors}}, date = {2020-04-01}, organization = {Cisco}, url = {https://umbrella.cisco.com/blog/navigating-cybersecurity-during-a-pandemic-latest-malware-and-threat-actors}, language = {English}, urldate = {2020-08-19} } Navigating Cybersecurity During a Pandemic: Latest Malware and Threat Actors
Azorult CloudEyE Formbook KPOT Stealer Metamorfo Nanocore RAT NetWire RC TrickBot
2020-03-24AviraAvira Protection Labs
@online{labs:20200324:new:88d7b1d, author = {Avira Protection Labs}, title = {{A new technique to analyze FormBook malware infections}}, date = {2020-03-24}, organization = {Avira}, url = {https://insights.oem.avira.com/a-new-technique-to-analyze-formbook-malware-infections/}, language = {English}, urldate = {2020-04-01} } A new technique to analyze FormBook malware infections
Formbook
2020-01-19360kate
@online{kate:20200119:bayworld:2cc2212, author = {kate}, title = {{BayWorld event, Cyber Attack Against Foreign Trade Industry}}, date = {2020-01-19}, organization = {360}, url = {https://blog.360totalsecurity.com/en/bayworld-event-cyber-attack-against-foreign-trade-industry/}, language = {English}, urldate = {2020-02-03} } BayWorld event, Cyber Attack Against Foreign Trade Industry
Azorult Formbook Nanocore RAT Revenge RAT
2019-12-12FireEyeChi-en Shen, Oleg Bondarenko
@online{shen:20191212:cyber:e01baca, author = {Chi-en Shen and Oleg Bondarenko}, title = {{Cyber Threat Landscape in Japan – Revealing Threat in the Shadow}}, date = {2019-12-12}, organization = {FireEye}, url = {https://www.slideshare.net/codeblue_jp/cb19-cyber-threat-landscape-in-japan-revealing-threat-in-the-shadow-by-chi-en-shen-ashley-oleg-bondarenko}, language = {English}, urldate = {2020-04-16} } Cyber Threat Landscape in Japan – Revealing Threat in the Shadow
Cerberus TSCookie Cobalt Strike Dtrack Emotet Formbook IcedID Icefog IRONHALO Loki Password Stealer (PWS) PandaBanker PLEAD poisonplug TrickBot BlackTech
2019-09-26ProofpointBryan Campbell, Jeremy Hedges, Proofpoint Threat Insight Team
@online{campbell:20190926:new:d228362, author = {Bryan Campbell and Jeremy Hedges and Proofpoint Threat Insight Team}, title = {{New WhiteShadow downloader uses Microsoft SQL to retrieve malware}}, date = {2019-09-26}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/new-whiteshadow-downloader-uses-microsoft-sql-retrieve-malware}, language = {English}, urldate = {2020-02-26} } New WhiteShadow downloader uses Microsoft SQL to retrieve malware
WhiteShadow Agent Tesla Azorult Crimson RAT Formbook Nanocore RAT NetWire RC NjRAT Remcos
2019-07-15Cisco TalosEdmund Brumaghin
@online{brumaghin:20190715:sweed:9725699, author = {Edmund Brumaghin}, title = {{SWEED: Exposing years of Agent Tesla campaigns}}, date = {2019-07-15}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2019/07/sweed-agent-tesla.html}, language = {English}, urldate = {2020-01-08} } SWEED: Exposing years of Agent Tesla campaigns
Agent Tesla Formbook Loki Password Stealer (PWS) SWEED
2019-06-12CyberbitHod Gavriel
@online{gavriel:20190612:formbook:8dc2df9, author = {Hod Gavriel}, title = {{Formbook Research Hints Large Data Theft Attack Brewing}}, date = {2019-06-12}, organization = {Cyberbit}, url = {https://www.cyberbit.com/formbook-research-hints-large-data-theft-attack-brewing/}, language = {English}, urldate = {2020-08-21} } Formbook Research Hints Large Data Theft Attack Brewing
Formbook
2019-05-02Usual Suspect REJohann Aydinbas
@online{aydinbas:20190502:formbook:d1ef715, author = {Johann Aydinbas}, title = {{FormBook - Hiding in plain sight}}, date = {2019-05-02}, organization = {Usual Suspect RE}, url = {https://usualsuspect.re/article/formbook-hiding-in-plain-sight}, language = {English}, urldate = {2020-01-13} } FormBook - Hiding in plain sight
Formbook
2019-01Virus BulletinGabriela Nicolao
@online{nicolao:201901:inside:a4c68f3, author = {Gabriela Nicolao}, title = {{Inside Formbook infostealer}}, date = {2019-01}, organization = {Virus Bulletin}, url = {https://www.virusbulletin.com/virusbulletin/2019/01/vb2018-paper-inside-formbook-infostealer/}, language = {English}, urldate = {2019-12-18} } Inside Formbook infostealer
Formbook
2018-12-05BotconfRémi Jullian
@techreport{jullian:20181205:formbook:40cf2ad, author = {Rémi Jullian}, title = {{FORMBOOK In-depth malware analysis}}, date = {2018-12-05}, institution = {Botconf}, url = {https://www.botconf.eu/wp-content/uploads/2018/12/2018-R-Jullian-In-depth-Formbook-Malware-Analysis.pdf}, language = {English}, urldate = {2019-12-17} } FORMBOOK In-depth malware analysis
Formbook
2018-11-01PeerlystSudhendu
@online{sudhendu:20181101:how:582221a, author = {Sudhendu}, title = {{How to Analyse FormBook - A New Malware-as-a-Service}}, date = {2018-11-01}, organization = {Peerlyst}, url = {https://www.peerlyst.com/posts/how-to-analyse-formbook-a-new-malware-as-a-service-sudhendu?trk=explore_page_resources_recent}, language = {English}, urldate = {2019-12-17} } How to Analyse FormBook - A New Malware-as-a-Service
Formbook
2018-10-16PeerlystSudhendu
@online{sudhendu:20181016:how:8aa1eed, author = {Sudhendu}, title = {{How to understand FormBook - A New Malware-as-a-Service}}, date = {2018-10-16}, organization = {Peerlyst}, url = {https://www.peerlyst.com/posts/how-to-understand-formbook-a-new-malware-as-a-service-sudhendu?}, language = {English}, urldate = {2020-01-09} } How to understand FormBook - A New Malware-as-a-Service
Formbook
2018-06-22InQuestAswanda
@online{aswanda:20180622:formbook:ce3c98b, author = {Aswanda}, title = {{FormBook stealer: Data theft made easy}}, date = {2018-06-22}, organization = {InQuest}, url = {http://blog.inquest.net/blog/2018/06/22/a-look-at-formbook-stealer/}, language = {English}, urldate = {2020-01-09} } FormBook stealer: Data theft made easy
Formbook
2018-06-20Cisco TalosWarren Mercer, Paul Rascagnères
@online{mercer:20180620:my:9c08115, author = {Warren Mercer and Paul Rascagnères}, title = {{My Little FormBook}}, date = {2018-06-20}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2018/06/my-little-formbook.html}, language = {English}, urldate = {2020-01-06} } My Little FormBook
Formbook
2018-03-29StormshieldRémi Jullian
@online{jullian:20180329:indepth:badef63, author = {Rémi Jullian}, title = {{In-depth Formbook malware analysis – Obfuscation and process injection}}, date = {2018-03-29}, organization = {Stormshield}, url = {https://thisissecurity.stormshield.com/2018/03/29/in-depth-formbook-malware-analysis-obfuscation-and-process-injection/}, language = {English}, urldate = {2020-01-10} } In-depth Formbook malware analysis – Obfuscation and process injection
Formbook
2018-01-29Vitali Kremez BlogVitali Kremez
@online{kremez:20180129:lets:450880d, author = {Vitali Kremez}, title = {{Let's Learn: Dissecting FormBook Infostealer Malware: Crypter & "RunLib.dll"}}, date = {2018-01-29}, organization = {Vitali Kremez Blog}, url = {http://www.vkremez.com/2018/01/lets-learn-dissecting-formbook.html}, language = {English}, urldate = {2020-01-10} } Let's Learn: Dissecting FormBook Infostealer Malware: Crypter & "RunLib.dll"
Formbook
2017-10-05FireEyeNart Villeneuve, Randi Eitzman, Sandor Nemes, Tyler Dean
@online{villeneuve:20171005:significant:0b91e49, author = {Nart Villeneuve and Randi Eitzman and Sandor Nemes and Tyler Dean}, title = {{Significant FormBook Distribution Campaigns Impacting the U.S. and South Korea}}, date = {2017-10-05}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2017/10/formbook-malware-distribution-campaigns.html}, language = {English}, urldate = {2019-12-20} } Significant FormBook Distribution Campaigns Impacting the U.S. and South Korea
Formbook
2017-09-20NetScoutDennis Schwarz
@online{schwarz:20170920:formidable:654d8e3, author = {Dennis Schwarz}, title = {{The Formidable FormBook Form Grabber}}, date = {2017-09-20}, organization = {NetScout}, url = {https://www.arbornetworks.com/blog/asert/formidable-formbook-form-grabber/}, language = {English}, urldate = {2019-07-09} } The Formidable FormBook Form Grabber
Formbook
2016-06Safety First BlogSL4ID3R
@online{sl4id3r:201606:form:53a7823, author = {SL4ID3R}, title = {{Form Grabber 2016 [Crome,FF,Opera,Thunderbird, Outlook IE Safari] Hack the world}}, date = {2016-06}, organization = {Safety First Blog}, url = {http://cambuz.blogspot.de/2016/06/form-grabber-2016-cromeffoperathunderbi.html}, language = {English}, urldate = {2019-11-26} } Form Grabber 2016 [Crome,FF,Opera,Thunderbird, Outlook IE Safari] Hack the world
Formbook
Yara Rules
[TLP:WHITE] win_formbook_auto (20211008 | Detects win.formbook.)
rule win_formbook_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.formbook."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.formbook"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 57 8b7d08 6a00 6a01 56 57 e8???????? }
            // n = 7, score = 1700
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   56                   | push                esi
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_1 = { 52 e8???????? 83c408 85c0 750d 8b36 394618 }
            // n = 7, score = 1700
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   750d                 | jne                 0xf
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   394618               | cmp                 dword ptr [esi + 0x18], eax

        $sequence_2 = { 6a02 57 8906 e8???????? 6a03 57 894604 }
            // n = 7, score = 1700
            //   6a02                 | push                2
            //   57                   | push                edi
            //   8906                 | mov                 dword ptr [esi], eax
            //   e8????????           |                     
            //   6a03                 | push                3
            //   57                   | push                edi
            //   894604               | mov                 dword ptr [esi + 4], eax

        $sequence_3 = { 50 8d8df6f7ffff 51 c745fc00000000 668985f4f7ffff e8???????? 8b7508 }
            // n = 7, score = 1700
            //   50                   | push                eax
            //   8d8df6f7ffff         | lea                 ecx, dword ptr [ebp - 0x80a]
            //   51                   | push                ecx
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   668985f4f7ffff       | mov                 word ptr [ebp - 0x80c], ax
            //   e8????????           |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

        $sequence_4 = { 56 e8???????? 83c40c 85c0 74e9 8bc6 5e }
            // n = 7, score = 1700
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   74e9                 | je                  0xffffffeb
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi

        $sequence_5 = { 752f 8b5604 6a0a 8d4df4 51 52 e8???????? }
            // n = 7, score = 1700
            //   752f                 | jne                 0x31
            //   8b5604               | mov                 edx, dword ptr [esi + 4]
            //   6a0a                 | push                0xa
            //   8d4df4               | lea                 ecx, dword ptr [ebp - 0xc]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_6 = { 6a00 50 56 e8???????? 8b0f 51 56 }
            // n = 7, score = 1700
            //   6a00                 | push                0
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   51                   | push                ecx
            //   56                   | push                esi

        $sequence_7 = { 004e2a 53 56 e8???????? 83c408 5f 5e }
            // n = 7, score = 1700
            //   004e2a               | add                 byte ptr [esi + 0x2a], cl
            //   53                   | push                ebx
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

    condition:
        7 of them and filesize < 371712
}
Download all Yara Rules