SYMBOLCOMMON_NAMEaka. SYNONYMS
win.buer (Back to overview)

Buer

aka: Buerloader, RustyBuer

Buer is a downloader sold on underground forums and used by threat actors to deliver payload malware onto target machines. It has been observed in email campaigns and has been sold as a service since August 2019.

References
2022-08-08Medium CSIS TechblogBenoît Ancel
@online{ancel:20220808:inside:67ef9a0, author = {Benoît Ancel}, title = {{An inside view of domain anonymization as-a-service — the BraZZZerSFF infrastructure}}, date = {2022-08-08}, organization = {Medium CSIS Techblog}, url = {https://medium.com/csis-techblog/inside-view-of-brazzzersff-infrastructure-89b9188fd145}, language = {English}, urldate = {2022-08-28} } An inside view of domain anonymization as-a-service — the BraZZZerSFF infrastructure
Riltok magecart Anubis Azorult BetaBot Buer CoalaBot CryptBot DiamondFox DreamBot GCleaner ISFB Loki Password Stealer (PWS) MedusaLocker MeguminTrojan Nemty PsiX RedLine Stealer SmokeLoader STOP TinyNuke Vidar Zloader
2022-03-31TrellixJohn Fokker, Jambul Tologonov
@online{fokker:20220331:conti:3bc2974, author = {John Fokker and Jambul Tologonov}, title = {{Conti Leaks: Examining the Panama Papers of Ransomware}}, date = {2022-03-31}, organization = {Trellix}, url = {https://www.trellix.com/en-us/about/newsroom/stories/threat-labs/conti-leaks-examining-the-panama-papers-of-ransomware.html}, language = {English}, urldate = {2022-04-07} } Conti Leaks: Examining the Panama Papers of Ransomware
LockBit Amadey Buer Conti IcedID LockBit Mailto Maze PhotoLoader Ryuk TrickBot
2022-03-17Trend MicroTrend Micro Research
@techreport{research:20220317:navigating:5ad631e, author = {Trend Micro Research}, title = {{Navigating New Frontiers Trend Micro 2021 Annual Cybersecurity Report}}, date = {2022-03-17}, institution = {Trend Micro}, url = {https://documents.trendmicro.com/assets/rpt/rpt-navigating-new-frontiers-trend-micro-2021-annual-cybersecurity-report.pdf}, language = {English}, urldate = {2022-03-22} } Navigating New Frontiers Trend Micro 2021 Annual Cybersecurity Report
REvil BazarBackdoor Buer IcedID QakBot REvil
2022-01-20TEHTRISTEHTRIS
@online{tehtris:20220120:buer:f7d5789, author = {TEHTRIS}, title = {{Buer Loader Analysis, a Rusted malware program}}, date = {2022-01-20}, organization = {TEHTRIS}, url = {https://tehtris.com/en/blog/buer-loader-analysis-a-rusted-malware-program}, language = {English}, urldate = {2022-03-01} } Buer Loader Analysis, a Rusted malware program
Buer
2021-11-05Trend MicroChristopher Boyton
@online{boyton:20211105:review:a1394e6, author = {Christopher Boyton}, title = {{A Review and Analysis of 2021 Buer Loader Campaigns}}, date = {2021-11-05}, organization = {Trend Micro}, url = {https://www.trendmicro.com/en_us/research/21/k/a-review-and-analysis-of-2021-buer-loader-campaigns.html}, language = {English}, urldate = {2021-11-08} } A Review and Analysis of 2021 Buer Loader Campaigns
Buer
2021-11-05Trend MicroChristopher Boyton
@techreport{boyton:20211105:analysis:2711253, author = {Christopher Boyton}, title = {{An Analysis of Buer Loader}}, date = {2021-11-05}, institution = {Trend Micro}, url = {https://www.trendmicro.com/content/dam/trendmicro/global/en/research/21/k/a-review-and-analysis-of-2021-buer-loader-campaigns/TechnicalBrief-An-Analysis-of-Buer-Loader.pdf}, language = {English}, urldate = {2021-11-08} } An Analysis of Buer Loader
Buer
2021-09-03Trend MicroMohamad Mokbel
@techreport{mokbel:20210903:state:df86499, author = {Mohamad Mokbel}, title = {{The State of SSL/TLS Certificate Usage in Malware C&C Communications}}, date = {2021-09-03}, institution = {Trend Micro}, url = {https://www.trendmicro.com/content/dam/trendmicro/global/en/research/21/i/ssl-tls-technical-brief/ssl-tls-technical-brief.pdf}, language = {English}, urldate = {2021-09-19} } The State of SSL/TLS Certificate Usage in Malware C&C Communications
AdWind ostap AsyncRAT BazarBackdoor BitRAT Buer Chthonic CloudEyE Cobalt Strike DCRat Dridex FindPOS GootKit Gozi IcedID ISFB Nanocore RAT Orcus RAT PandaBanker Qadars QakBot Quasar RAT Rockloader ServHelper Shifu SManager TorrentLocker TrickBot Vawtrak Zeus Zloader
2021-08-05The RecordCatalin Cimpanu
@online{cimpanu:20210805:meet:bce8310, author = {Catalin Cimpanu}, title = {{Meet Prometheus, the secret TDS behind some of today’s malware campaigns}}, date = {2021-08-05}, organization = {The Record}, url = {https://therecord.media/meet-prometheus-the-secret-tds-behind-some-of-todays-malware-campaigns/}, language = {English}, urldate = {2021-08-06} } Meet Prometheus, the secret TDS behind some of today’s malware campaigns
Buer campoloader IcedID QakBot
2021-08-05Group-IBViktor Okorokov, Nikita Rostovcev
@online{okorokov:20210805:prometheus:38ab6a6, author = {Viktor Okorokov and Nikita Rostovcev}, title = {{Prometheus TDS The key to success for Campo Loader, Hancitor, IcedID, and QBot}}, date = {2021-08-05}, organization = {Group-IB}, url = {https://blog.group-ib.com/prometheus-tds}, language = {English}, urldate = {2021-08-06} } Prometheus TDS The key to success for Campo Loader, Hancitor, IcedID, and QBot
Prometheus Backdoor Buer campoloader Hancitor IcedID QakBot
2021-07-27BlackberryBlackBerry Research & Intelligence Team
@techreport{team:20210727:old:3060d53, author = {BlackBerry Research & Intelligence Team}, title = {{Old Dogs New Tricks: Attackers Adopt Exotic Programming Languages}}, date = {2021-07-27}, institution = {Blackberry}, url = {https://www.blackberry.com/content/dam/blackberry-com/asset/enterprise/pdf/direct/report-old-dogs-new-tricks.pdf}, language = {English}, urldate = {2021-07-27} } Old Dogs New Tricks: Attackers Adopt Exotic Programming Languages
elf.wellmess ElectroRAT BazarNimrod Buer Cobalt Strike Remcos Snake TeleBot WellMess Zebrocy
2021-07-19FortinetVal Saengphaibul, Fred Gutierrez
@online{saengphaibul:20210719:signed:d9f809c, author = {Val Saengphaibul and Fred Gutierrez}, title = {{Signed, Sealed, and Delivered – Signed XLL File Delivers Buer Loader}}, date = {2021-07-19}, organization = {Fortinet}, url = {https://www.fortinet.com/blog/threat-research/signed-sealed-and-delivered-signed-xll-file-delivers-buer-loader}, language = {English}, urldate = {2021-07-26} } Signed, Sealed, and Delivered – Signed XLL File Delivers Buer Loader
Buer
2021-05-03Medium walmartglobaltechJoshua Platt, Jason Reaves
@online{platt:20210503:buerloader:2aa3e3f, author = {Joshua Platt and Jason Reaves}, title = {{BuerLoader Updates}}, date = {2021-05-03}, organization = {Medium walmartglobaltech}, url = {https://medium.com/walmartglobaltech/buerloader-updates-3e34c1949b96}, language = {English}, urldate = {2021-05-04} } BuerLoader Updates
Buer
2021-05-03ProofpointKelsey Merriman, Bryan Campbell, Selena Larson, Proofpoint Threat Research Team
@online{merriman:20210503:new:cd4d275, author = {Kelsey Merriman and Bryan Campbell and Selena Larson and Proofpoint Threat Research Team}, title = {{New Variant of Buer Loader Written in Rust}}, date = {2021-05-03}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/blog/threat-insight/new-variant-buer-loader-written-rust}, language = {English}, urldate = {2021-05-03} } New Variant of Buer Loader Written in Rust
Buer
2021-03-18VIPREVIPRE Labs
@online{labs:20210318:buer:bbd7d97, author = {VIPRE Labs}, title = {{Buer Loader Found in an Unusual Email Attachment}}, date = {2021-03-18}, organization = {VIPRE}, url = {https://labs.vipre.com/buer-loader-found-in-an-unusual-email-attachment/}, language = {English}, urldate = {2022-04-20} } Buer Loader Found in an Unusual Email Attachment
Buer
2021-03Group-IBOleg Skulkin, Roman Rezvukhin, Semyon Rogachev
@techreport{skulkin:202103:ransomware:992ca10, author = {Oleg Skulkin and Roman Rezvukhin and Semyon Rogachev}, title = {{Ransomware Uncovered 2020/2021}}, date = {2021-03}, institution = {Group-IB}, url = {https://web.archive.org/web/20210305181115/https://cisoclub.ru/doc/otchet-kompanii-group-ib-ransomware-uncovered-2020-2021/?bp-attachment=group-ib_ransomware_uncovered_2020-2021.pdf}, language = {English}, urldate = {2021-06-16} } Ransomware Uncovered 2020/2021
RansomEXX BazarBackdoor Buer Clop Conti DoppelPaymer Dridex Egregor IcedID Maze PwndLocker QakBot RansomEXX REvil Ryuk SDBbot TrickBot Zloader
2021-02-25ANSSICERT-FR
@techreport{certfr:20210225:ryuk:7895e12, author = {CERT-FR}, title = {{Ryuk Ransomware}}, date = {2021-02-25}, institution = {ANSSI}, url = {https://www.cert.ssi.gouv.fr/uploads/CERTFR-2021-CTI-006.pdf}, language = {English}, urldate = {2021-03-02} } Ryuk Ransomware
BazarBackdoor Buer Conti Emotet Ryuk TrickBot
2021-02-02CRONUPGermán Fernández
@online{fernndez:20210202:de:6ff4f3a, author = {Germán Fernández}, title = {{De ataque con Malware a incidente de Ransomware}}, date = {2021-02-02}, organization = {CRONUP}, url = {https://www.cronup.com/post/de-ataque-con-malware-a-incidente-de-ransomware}, language = {Spanish}, urldate = {2021-03-02} } De ataque con Malware a incidente de Ransomware
Avaddon BazarBackdoor Buer Clop Cobalt Strike Conti DanaBot Dharma Dridex Egregor Emotet Empire Downloader FriedEx GootKit IcedID MegaCortex Nemty Phorpiex PwndLocker PyXie QakBot RansomEXX REvil Ryuk SDBbot SmokeLoader TrickBot Zloader
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
2021SecureworksSecureWorks
@online{secureworks:2021:threat:07bd94a, author = {SecureWorks}, title = {{Threat Profile: GOLD SYMPHONY}}, date = {2021}, organization = {Secureworks}, url = {http://www.secureworks.com/research/threat-profiles/gold-symphony}, language = {English}, urldate = {2021-05-28} } Threat Profile: GOLD SYMPHONY
Buer GOLD SYMPHONY
2021SecureworksSecureWorks
@online{secureworks:2021:threat:4e7c443, author = {SecureWorks}, title = {{Threat Profile: GOLD BLACKBURN}}, date = {2021}, organization = {Secureworks}, url = {http://www.secureworks.com/research/threat-profiles/gold-blackburn}, language = {English}, urldate = {2021-05-28} } Threat Profile: GOLD BLACKBURN
Buer Dyre TrickBot WIZARD SPIDER
2020-11-20ZDNetCatalin Cimpanu
@online{cimpanu:20201120:malware:0b8ff59, author = {Catalin Cimpanu}, title = {{The malware that usually installs ransomware and you need to remove right away}}, date = {2020-11-20}, organization = {ZDNet}, url = {https://www.zdnet.com/article/the-malware-that-usually-installs-ransomware-and-you-need-to-remove-right-away/}, language = {English}, urldate = {2020-11-23} } The malware that usually installs ransomware and you need to remove right away
Avaddon BazarBackdoor Buer Clop Cobalt Strike Conti DoppelPaymer Dridex Egregor Emotet FriedEx MegaCortex Phorpiex PwndLocker QakBot Ryuk SDBbot TrickBot Zloader
2020-11-18Minerva LabsEddy Bobritsky
@online{bobritsky:20201118:stopping:e5c486b, author = {Eddy Bobritsky}, title = {{Stopping BuerLoader With Minerva Lab's Hostile Environment Simulation module}}, date = {2020-11-18}, organization = {Minerva Labs}, url = {https://blog.minerva-labs.com/stopping-buerloader}, language = {English}, urldate = {2020-11-19} } Stopping BuerLoader With Minerva Lab's Hostile Environment Simulation module
Buer
2020-11-09Area 1Threat Research Team
@online{team:20201109:phishing:a25a567, author = {Threat Research Team}, title = {{Phishing Campaign Threatens Job Security, Drops Bazar and Buer Malware}}, date = {2020-11-09}, organization = {Area 1}, url = {https://www.area1security.com/blog/trickbot-spear-phishing-drops-bazar-buer-malware/}, language = {English}, urldate = {2020-11-18} } Phishing Campaign Threatens Job Security, Drops Bazar and Buer Malware
BazarBackdoor Buer
2020-10-29Twitter (@SophosLabs)SophosLabs
@online{sophoslabs:20201029:similarities:408a640, author = {SophosLabs}, title = {{Tweet on similarities between BUER in-memory loader & RYUK in-memory loader}}, date = {2020-10-29}, organization = {Twitter (@SophosLabs)}, url = {https://twitter.com/SophosLabs/status/1321844306970251265}, language = {English}, urldate = {2020-11-02} } Tweet on similarities between BUER in-memory loader & RYUK in-memory loader
Buer Ryuk
2020-10-28SophosLabs UncutSean Gallagher, Peter Mackenzie, Elida Leite, Syed Shahram, Bill Kearny, Anand Ajjan, Brett Cove, Gabor Szappanos
@online{gallagher:20201028:hacks:8e1d051, author = {Sean Gallagher and Peter Mackenzie and Elida Leite and Syed Shahram and Bill Kearny and Anand Ajjan and Brett Cove and Gabor Szappanos}, title = {{Hacks for sale: inside the Buer Loader malware-as-a-service}}, date = {2020-10-28}, organization = {SophosLabs Uncut}, url = {https://news.sophos.com/en-us/2020/10/28/hacks-for-sale-inside-the-buer-loader-malware-as-a-service/}, language = {English}, urldate = {2020-11-02} } Hacks for sale: inside the Buer Loader malware-as-a-service
Buer Ryuk Zloader
2020-09-29ZscalerMohd Sadique, Atinderpal Singh
@online{sadique:20200929:spear:de79be6, author = {Mohd Sadique and Atinderpal Singh}, title = {{Spear Phishing Campaign Delivers Buer and Bazar Malware}}, date = {2020-09-29}, organization = {Zscaler}, url = {https://www.zscaler.com/blogs/research/spear-phishing-campaign-delivers-buer-and-bazar-malware}, language = {English}, urldate = {2020-10-15} } Spear Phishing Campaign Delivers Buer and Bazar Malware
BazarBackdoor Buer
2020-03-05Kaspersky LabsAMR
@online{amr:20200305:mokes:698295f, author = {AMR}, title = {{Mokes and Buerak distributed under the guise of security certificates}}, date = {2020-03-05}, organization = {Kaspersky Labs}, url = {https://securelist.com/mokes-and-buerak-distributed-under-the-guise-of-security-certificates/96324/}, language = {English}, urldate = {2020-03-09} } Mokes and Buerak distributed under the guise of security certificates
Buer Mokes
2019-12-05KrabsOnSecurityMr. Krabs
@online{krabs:20191205:buer:9c3cf72, author = {Mr. Krabs}, title = {{Buer Loader, new Russian loader on the market with interesting persistence}}, date = {2019-12-05}, organization = {KrabsOnSecurity}, url = {https://krabsonsecurity.com/2019/12/05/buer-loader-new-russian-loader-on-the-market-with-interesting-persistence/}, language = {English}, urldate = {2020-01-08} } Buer Loader, new Russian loader on the market with interesting persistence
Buer
2019-12-04ProofpointKelsey Merriman, Dennis Schwarz, Kafeine, Axel F
@online{merriman:20191204:buer:6c413aa, author = {Kelsey Merriman and Dennis Schwarz and Kafeine and Axel F}, title = {{Buer, a new loader emerges in the underground marketplace}}, date = {2019-12-04}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/buer-new-loader-emerges-underground-marketplace}, language = {English}, urldate = {2020-01-06} } Buer, a new loader emerges in the underground marketplace
Buer
2019-10-10Twitter (@StopMalvertisin)Kimberly
@online{kimberly:20191010:malware:032ed3c, author = {Kimberly}, title = {{Tweet on Malware Sample}}, date = {2019-10-10}, organization = {Twitter (@StopMalvertisin)}, url = {https://twitter.com/StopMalvertisin/status/1182505434231398401}, language = {English}, urldate = {2020-01-10} } Tweet on Malware Sample
Buer
Yara Rules
[TLP:WHITE] win_buer_auto (20221125 | Detects win.buer.)
rule win_buer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.buer."
        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.buer"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 7420 83e801 740b 83e801 }
            // n = 4, score = 1100
            //   7420                 | je                  0x22
            //   83e801               | sub                 eax, 1
            //   740b                 | je                  0xd
            //   83e801               | sub                 eax, 1

        $sequence_1 = { 03c2 8b55e8 015158 8b55d8 }
            // n = 4, score = 1100
            //   03c2                 | add                 eax, edx
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   015158               | add                 dword ptr [ecx + 0x58], edx
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]

        $sequence_2 = { 8b4b44 8b5348 8b734c 8b7b50 }
            // n = 4, score = 1100
            //   8b4b44               | mov                 ecx, dword ptr [ebx + 0x44]
            //   8b5348               | mov                 edx, dword ptr [ebx + 0x48]
            //   8b734c               | mov                 esi, dword ptr [ebx + 0x4c]
            //   8b7b50               | mov                 edi, dword ptr [ebx + 0x50]

        $sequence_3 = { 8a0c46 880c18 40 3bc2 7cf1 eb02 }
            // n = 6, score = 1100
            //   8a0c46               | mov                 cl, byte ptr [esi + eax*2]
            //   880c18               | mov                 byte ptr [eax + ebx], cl
            //   40                   | inc                 eax
            //   3bc2                 | cmp                 eax, edx
            //   7cf1                 | jl                  0xfffffff3
            //   eb02                 | jmp                 4

        $sequence_4 = { 33c0 85d2 7e13 3bc7 7d0f }
            // n = 5, score = 1100
            //   33c0                 | xor                 eax, eax
            //   85d2                 | test                edx, edx
            //   7e13                 | jle                 0x15
            //   3bc7                 | cmp                 eax, edi
            //   7d0f                 | jge                 0x11

        $sequence_5 = { 1bc0 83e0e0 83c057 59 }
            // n = 4, score = 1100
            //   1bc0                 | sbb                 eax, eax
            //   83e0e0               | and                 eax, 0xffffffe0
            //   83c057               | add                 eax, 0x57
            //   59                   | pop                 ecx

        $sequence_6 = { 6803010000 ff75f8 ff15???????? 59 59 85c0 }
            // n = 6, score = 1100
            //   6803010000           | push                0x103
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax

        $sequence_7 = { 85ff 7504 8bc2 eb19 }
            // n = 4, score = 1100
            //   85ff                 | test                edi, edi
            //   7504                 | jne                 6
            //   8bc2                 | mov                 eax, edx
            //   eb19                 | jmp                 0x1b

        $sequence_8 = { e8???????? 56 8d842480000000 50 53 e8???????? }
            // n = 6, score = 300
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d842480000000       | lea                 eax, [esp + 0x80]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_9 = { c1e105 8d842420020000 2bc1 50 8d842484010000 50 }
            // n = 6, score = 300
            //   c1e105               | shl                 ecx, 5
            //   8d842420020000       | lea                 eax, [esp + 0x220]
            //   2bc1                 | sub                 eax, ecx
            //   50                   | push                eax
            //   8d842484010000       | lea                 eax, [esp + 0x184]
            //   50                   | push                eax

        $sequence_10 = { e8???????? 56 8d842438010000 50 8d842414010000 50 e8???????? }
            // n = 7, score = 300
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d842438010000       | lea                 eax, [esp + 0x138]
            //   50                   | push                eax
            //   8d842414010000       | lea                 eax, [esp + 0x114]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_11 = { c1e902 33c0 f3ab eb04 }
            // n = 4, score = 300
            //   c1e902               | shr                 ecx, 2
            //   33c0                 | xor                 eax, eax
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   eb04                 | jmp                 6

        $sequence_12 = { c1e81f f7d8 c3 8b442404 }
            // n = 4, score = 300
            //   c1e81f               | shr                 eax, 0x1f
            //   f7d8                 | neg                 eax
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]

        $sequence_13 = { c1e106 034c241c 80fbf0 7219 }
            // n = 4, score = 300
            //   c1e106               | shl                 ecx, 6
            //   034c241c             | add                 ecx, dword ptr [esp + 0x1c]
            //   80fbf0               | cmp                 bl, 0xf0
            //   7219                 | jb                  0x1b

        $sequence_14 = { e8???????? 56 8d442468 57 50 e8???????? 8d4378 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d442468             | lea                 eax, [esp + 0x68]
            //   57                   | push                edi
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4378               | lea                 eax, [ebx + 0x78]

        $sequence_15 = { c1e81f f7d6 c1ee1f 23c6 f7d8 50 8d442454 }
            // n = 7, score = 300
            //   c1e81f               | shr                 eax, 0x1f
            //   f7d6                 | not                 esi
            //   c1ee1f               | shr                 esi, 0x1f
            //   23c6                 | and                 eax, esi
            //   f7d8                 | neg                 eax
            //   50                   | push                eax
            //   8d442454             | lea                 eax, [esp + 0x54]

    condition:
        7 of them and filesize < 3031040
}
Download all Yara Rules