SYMBOLCOMMON_NAMEaka. SYNONYMS
win.mespinoza (Back to overview)

Mespinoza

aka: pysa

Mespinosa is a ransomware which encrypts file using an asymmetric encryption and adds .pysa as file extension. According to dissectingmalware the extension "pysa" is probably derived from the Zanzibari Coin with the same name.

References
2021-11-29cybleCyble
@online{cyble:20211129:pysa:4da06b5, author = {Cyble}, title = {{Pysa Ransomware Under the Lens: A Deep-Dive Analysis}}, date = {2021-11-29}, organization = {cyble}, url = {https://blog.cyble.com/2021/11/29/pysa-ransomware-under-the-lens-a-deep-dive-analysis/}, language = {English}, urldate = {2021-12-07} } Pysa Ransomware Under the Lens: A Deep-Dive Analysis
Mespinoza
2021-11-05Twitter (@inversecos)inversecos
@online{inversecos:20211105:ttps:2b9481e, author = {inversecos}, title = {{TTPs used by Pysa Ransonmware group}}, date = {2021-11-05}, organization = {Twitter (@inversecos)}, url = {https://twitter.com/inversecos/status/1456486725664993287}, language = {English}, urldate = {2021-11-08} } TTPs used by Pysa Ransonmware group
Mespinoza MimiKatz
2021-09-27CybereasonAleksandar Milenkoski
@online{milenkoski:20210927:threat:843919b, author = {Aleksandar Milenkoski}, title = {{Threat Analysis Report: Inside the Destructive PYSA Ransomware}}, date = {2021-09-27}, organization = {Cybereason}, url = {https://www.cybereason.com/blog/threat-analysis-report-inside-the-destructive-pysa-ransomware}, language = {English}, urldate = {2021-09-28} } Threat Analysis Report: Inside the Destructive PYSA Ransomware
Mespinoza
2021-09-09Lacework LabsLacework Labs
@online{labs:20210909:pysa:3115858, author = {Lacework Labs}, title = {{PYSA Ransomware Gang adds Linux Support}}, date = {2021-09-09}, organization = {Lacework Labs}, url = {https://www.lacework.com/blog/pysa-ransomware-gang-adds-linux-support/}, language = {English}, urldate = {2021-09-10} } PYSA Ransomware Gang adds Linux Support
Mespinoza
2021-07-15Palo Alto Networks Unit 42Robert Falcone, Alex Hinchliffe, Quinn Cooke
@online{falcone:20210715:mespinoza:cabb0ab, author = {Robert Falcone and Alex Hinchliffe and Quinn Cooke}, title = {{Mespinoza Ransomware Gang Calls Victims “Partners,” Attacks with Gasket, "MagicSocks" Tools}}, date = {2021-07-15}, organization = {Palo Alto Networks Unit 42}, url = {https://unit42.paloaltonetworks.com/gasket-and-magicsocks-tools-install-mespinoza-ransomware/}, language = {English}, urldate = {2021-07-20} } Mespinoza Ransomware Gang Calls Victims “Partners,” Attacks with Gasket, "MagicSocks" Tools
Gasket Mespinoza
2021-06-23BlackberryBlackBerry Research and Intelligence team
@online{team:20210623:pysa:ab64a25, author = {BlackBerry Research and Intelligence team}, title = {{PYSA Loves ChaChi: a New GoLang RAT}}, date = {2021-06-23}, organization = {Blackberry}, url = {https://blogs.blackberry.com/en/2021/06/pysa-loves-chachi-a-new-golang-rat}, language = {English}, urldate = {2021-06-24} } PYSA Loves ChaChi: a New GoLang RAT
Mespinoza
2021-05-10DarkTracerDarkTracer
@online{darktracer:20210510:intelligence:b9d1c3f, author = {DarkTracer}, title = {{Intelligence Report on Ransomware Gangs on the DarkWeb: List of victim organizations attacked by ransomware gangs released on the DarkWeb}}, date = {2021-05-10}, organization = {DarkTracer}, url = {https://docs.google.com/spreadsheets/d/1MI8Z2tBhmqQ5X8Wf_ozv3dVjz5sJOs-3}, language = {English}, urldate = {2021-05-13} } Intelligence Report on Ransomware Gangs on the DarkWeb: List of victim organizations attacked by ransomware gangs released on the DarkWeb
RansomEXX Avaddon Babuk Clop Conti Cuba DarkSide DoppelPaymer Egregor Hades LockBit Mailto Maze MedusaLocker Mespinoza Mount Locker Nefilim Nemty Pay2Key PwndLocker RagnarLocker Ragnarok RansomEXX REvil Sekhmet SunCrypt ThunderX
2021-05-06Cyborg SecurityBrandon Denker
@online{denker:20210506:ransomware:a1f31df, author = {Brandon Denker}, title = {{Ransomware: Hunting for Inhibiting System Backup or Recovery}}, date = {2021-05-06}, organization = {Cyborg Security}, url = {https://www.cyborgsecurity.com/cyborg_labs/hunting-ransomware-inhibiting-system-backup-or-recovery/}, language = {English}, urldate = {2021-05-08} } Ransomware: Hunting for Inhibiting System Backup or Recovery
Avaddon Conti DarkSide LockBit Mailto Maze Mespinoza Nemty PwndLocker RagnarLocker RansomEXX REvil Ryuk Snatch ThunderX
2021-04-25Vulnerability.ch BlogCorsin Camichel
@online{camichel:20210425:ransomware:1a1ee7f, author = {Corsin Camichel}, title = {{Ransomware and Data Leak Site Publication Time Analysis}}, date = {2021-04-25}, organization = {Vulnerability.ch Blog}, url = {https://vulnerability.ch/2021/04/ransomware-and-date-leak-site-publication-time-analysis/}, language = {English}, urldate = {2021-04-29} } Ransomware and Data Leak Site Publication Time Analysis
Avaddon Babuk Clop Conti DarkSide DoppelPaymer Mespinoza Nefilim REvil
2021-03-16FBIFBI
@techreport{fbi:20210316:alert:69b1a21, author = {FBI}, title = {{Alert Number CP-000142-MW: Increase in PYSA Ransomware Targeting Education Institutions}}, date = {2021-03-16}, institution = {FBI}, url = {https://www.ic3.gov/Media/News/2021/210316.pdf}, language = {English}, urldate = {2021-03-22} } Alert Number CP-000142-MW: Increase in PYSA Ransomware Targeting Education Institutions
Mespinoza
2021-02-23CrowdStrikeCrowdStrike
@techreport{crowdstrike:20210223:2021:bf5bc4f, author = {CrowdStrike}, title = {{2021 Global Threat Report}}, date = {2021-02-23}, institution = {CrowdStrike}, url = {https://go.crowdstrike.com/rs/281-OBQ-266/images/Report2021GTR.pdf}, language = {English}, urldate = {2021-02-25} } 2021 Global Threat Report
RansomEXX Amadey Anchor Avaddon BazarBackdoor Clop Cobalt Strike Conti Cutwail DanaBot DarkSide DoppelPaymer Dridex Egregor Emotet Hakbit IcedID JSOutProx KerrDown LockBit Mailto Maze MedusaLocker Mespinoza Mount Locker NedDnLoader Nemty Pay2Key PlugX Pushdo PwndLocker PyXie QakBot Quasar RAT RagnarLocker Ragnarok RansomEXX REvil Ryuk Sekhmet ShadowPad SmokeLoader Snake SUNBURST SunCrypt TEARDROP TrickBot WastedLocker Winnti Zloader KNOCKOUT SPIDER OUTLAW SPIDER RIDDLE SPIDER SOLAR SPIDER VIKING SPIDER
2021-01-07Twitter (@campuscodi)Catalin Cimpanu
@online{cimpanu:20210107:londons:3d62f93, author = {Catalin Cimpanu}, title = {{Tweet on London's Hackney Council attacked by Pysa/Mespinoza ransomware}}, date = {2021-01-07}, organization = {Twitter (@campuscodi)}, url = {https://twitter.com/campuscodi/status/1347223969984897026}, language = {English}, urldate = {2021-01-11} } Tweet on London's Hackney Council attacked by Pysa/Mespinoza ransomware
Mespinoza
2021SecureworksSecureWorks
@online{secureworks:2021:threat:d17547d, author = {SecureWorks}, title = {{Threat Profile: GOLD BURLAP}}, date = {2021}, organization = {Secureworks}, url = {http://www.secureworks.com/research/threat-profiles/gold-burlap}, language = {English}, urldate = {2021-05-31} } Threat Profile: GOLD BURLAP
Empire Downloader Mespinoza MimiKatz GOLD BURLAP
2020-11-23The DFIR ReportThe DFIR Report
@online{report:20201123:pysamespinoza:f0f2544, author = {The DFIR Report}, title = {{PYSA/Mespinoza Ransomware}}, date = {2020-11-23}, organization = {The DFIR Report}, url = {https://thedfirreport.com/2020/11/23/pysa-mespinoza-ransomware/}, language = {English}, urldate = {2021-01-21} } PYSA/Mespinoza Ransomware
Empire Downloader Mespinoza
2020-11-16Intel 471Intel 471
@online{471:20201116:ransomwareasaservice:11a5a8b, author = {Intel 471}, title = {{Ransomware-as-a-service: The pandemic within a pandemic}}, date = {2020-11-16}, organization = {Intel 471}, url = {https://public.intel471.com/blog/ransomware-as-a-service-2020-ryuk-maze-revil-egregor-doppelpaymer/}, language = {English}, urldate = {2020-11-17} } Ransomware-as-a-service: The pandemic within a pandemic
Avaddon Clop Conti DoppelPaymer Egregor Hakbit Mailto Maze Mespinoza RagnarLocker REvil Ryuk SunCrypt ThunderX
2020-10-23HornetsecurityHornetsecurity Security Lab
@online{lab:20201023:leakwareransomwarehybrid:ae1de8e, author = {Hornetsecurity Security Lab}, title = {{Leakware-Ransomware-Hybrid Attacks}}, date = {2020-10-23}, organization = {Hornetsecurity}, url = {https://www.hornetsecurity.com/en/security-informationen-en/leakware-ransomware-hybrid-attacks/}, language = {English}, urldate = {2020-12-08} } Leakware-Ransomware-Hybrid Attacks
Avaddon Clop Conti DarkSide DoppelPaymer Mailto Maze Mespinoza Nefilim RagnarLocker REvil Sekhmet SunCrypt
2020-08-25KELAVictoria Kivilevich
@online{kivilevich:20200825:how:5db6a82, author = {Victoria Kivilevich}, title = {{How Ransomware Gangs Find New Monetization Schemes and Evolve in Marketing}}, date = {2020-08-25}, organization = {KELA}, url = {https://ke-la.com/how-ransomware-gangs-find-new-monetization-schemes-and-evolve-in-marketing/}, language = {English}, urldate = {2021-05-07} } How Ransomware Gangs Find New Monetization Schemes and Evolve in Marketing
Avaddon Clop DarkSide DoppelPaymer Mailto Maze MedusaLocker Mespinoza Nefilim RagnarLocker REvil Sekhmet
2020-03-19ZDNetCatalin Cimpanu
@online{cimpanu:20200319:france:9882b07, author = {Catalin Cimpanu}, title = {{France warns of new ransomware gang targeting local governments}}, date = {2020-03-19}, organization = {ZDNet}, url = {https://www.zdnet.com/article/france-warns-of-new-ransomware-gang-targeting-local-governments/}, language = {English}, urldate = {2020-03-26} } France warns of new ransomware gang targeting local governments
Mespinoza
2020-03-18CERT-FRCERT-FR
@online{certfr:20200318:rapport:abbc7c4, author = {CERT-FR}, title = {{Rapport Menaces et Incidents du CERT-FR: Attaques par le rançongiciel Mespinoza/Pysa}}, date = {2020-03-18}, organization = {CERT-FR}, url = {https://www.cert.ssi.gouv.fr/cti/CERTFR-2020-CTI-002/}, language = {French}, urldate = {2020-03-26} } Rapport Menaces et Incidents du CERT-FR: Attaques par le rançongiciel Mespinoza/Pysa
Mespinoza
2019-12-14Dissecting MalwareMarius Genheimer
@online{genheimer:20191214:another:7c9c60a, author = {Marius Genheimer}, title = {{Another one for the collection - Mespinoza (Pysa) Ransomware}}, date = {2019-12-14}, organization = {Dissecting Malware}, url = {https://dissectingmalwa.re/another-one-for-the-collection-mespinoza-pysa-ransomware.html}, language = {English}, urldate = {2020-01-26} } Another one for the collection - Mespinoza (Pysa) Ransomware
Mespinoza
2019-10-11ID RansomwareAndrew Ivanov
@online{ivanov:20191011:mespinoza:e9cd17e, author = {Andrew Ivanov}, title = {{Mespinoza Ransomware}}, date = {2019-10-11}, organization = {ID Ransomware}, url = {https://id-ransomware.blogspot.com/2019/10/mespinoza-ransomware.html}, language = {English}, urldate = {2020-03-26} } Mespinoza Ransomware
Mespinoza
Yara Rules
[TLP:WHITE] win_mespinoza_auto (20211008 | Detects win.mespinoza.)
rule win_mespinoza_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.mespinoza."
        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.mespinoza"
        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 = { 8d0cbd00000000 894604 8b06 56 ff750c 03c1 c745fc00000000 }
            // n = 7, score = 200
            //   8d0cbd00000000       | lea                 ecx, dword ptr [edi*4]
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   56                   | push                esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   03c1                 | add                 eax, ecx
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0

        $sequence_1 = { e8???????? ff7510 8d45b0 8bce 57 50 e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8d45b0               | lea                 eax, dword ptr [ebp - 0x50]
            //   8bce                 | mov                 ecx, esi
            //   57                   | push                edi
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_2 = { 8b4908 8b01 ff6008 55 8bec 56 8bf1 }
            // n = 7, score = 200
            //   8b4908               | mov                 ecx, dword ptr [ecx + 8]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff6008               | jmp                 dword ptr [eax + 8]
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx

        $sequence_3 = { c74504???????? c6451800 ff5048 85c0 0f847dfeffff 807df103 0f8573feffff }
            // n = 7, score = 200
            //   c74504????????       |                     
            //   c6451800             | mov                 byte ptr [ebp + 0x18], 0
            //   ff5048               | call                dword ptr [eax + 0x48]
            //   85c0                 | test                eax, eax
            //   0f847dfeffff         | je                  0xfffffe83
            //   807df103             | cmp                 byte ptr [ebp - 0xf], 3
            //   0f8573feffff         | jne                 0xfffffe79

        $sequence_4 = { 0f94c0 c3 8b01 ff605c 83c1fc 8b01 ff5044 }
            // n = 7, score = 200
            //   0f94c0               | sete                al
            //   c3                   | ret                 
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff605c               | jmp                 dword ptr [eax + 0x5c]
            //   83c1fc               | add                 ecx, -4
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff5044               | call                dword ptr [eax + 0x44]

        $sequence_5 = { 57 ff7604 897de8 ff36 e8???????? 8b4604 83c41c }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ff7604               | push                dword ptr [esi + 4]
            //   897de8               | mov                 dword ptr [ebp - 0x18], edi
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   83c41c               | add                 esp, 0x1c

        $sequence_6 = { 0f45c8 894dd4 3bcf 740a 807df300 7504 32d2 }
            // n = 7, score = 200
            //   0f45c8               | cmovne              ecx, eax
            //   894dd4               | mov                 dword ptr [ebp - 0x2c], ecx
            //   3bcf                 | cmp                 ecx, edi
            //   740a                 | je                  0xc
            //   807df300             | cmp                 byte ptr [ebp - 0xd], 0
            //   7504                 | jne                 6
            //   32d2                 | xor                 dl, dl

        $sequence_7 = { 83c404 8b46e4 3b46e8 8b5eec 8bfb 1bc0 }
            // n = 6, score = 200
            //   83c404               | add                 esp, 4
            //   8b46e4               | mov                 eax, dword ptr [esi - 0x1c]
            //   3b46e8               | cmp                 eax, dword ptr [esi - 0x18]
            //   8b5eec               | mov                 ebx, dword ptr [esi - 0x14]
            //   8bfb                 | mov                 edi, ebx
            //   1bc0                 | sbb                 eax, eax

        $sequence_8 = { 6bd030 8b0c8d00b04700 804c112802 5b 2bf7 }
            // n = 5, score = 200
            //   6bd030               | imul                edx, eax, 0x30
            //   8b0c8d00b04700       | mov                 ecx, dword ptr [ecx*4 + 0x47b000]
            //   804c112802           | or                  byte ptr [ecx + edx + 0x28], 2
            //   5b                   | pop                 ebx
            //   2bf7                 | sub                 esi, edi

        $sequence_9 = { 7586 8b4df4 64890d00000000 59 5f 5e 5b }
            // n = 7, score = 200
            //   7586                 | jne                 0xffffff88
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

    condition:
        7 of them and filesize < 1091584
}
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