SYMBOLCOMMON_NAMEaka. SYNONYMS
win.mailto (Back to overview)

Mailto

aka: Koko Ransomware, NetWalker

There is no description at this point.

References
2020-09-29MicrosoftMicrosoft
@techreport{microsoft:20200929:microsoft:6e5d7b0, author = {Microsoft}, title = {{Microsoft Digital Defense Report}}, date = {2020-09-29}, institution = {Microsoft}, url = {https://download.microsoft.com/download/f/8/1/f816b8b6-bee3-41e5-b6cc-e925a5688f61/Microsoft_Digital_Defense_Report_2020_September.pdf}, language = {English}, urldate = {2020-10-05} } Microsoft Digital Defense Report
Emotet IcedID Mailto Maze QakBot REvil RobinHood TrickBot
2020-09-24Kaspersky LabsKaspersky Lab ICS CERT
@techreport{cert:20200924:threat:2d7986d, author = {Kaspersky Lab ICS CERT}, title = {{Threat landscape for industrial automation systems - H1 2020}}, date = {2020-09-24}, institution = {Kaspersky Labs}, url = {https://ics-cert.kaspersky.com/media/KASPERSKY_H1_2020_ICS_REPORT_EN.pdf}, language = {English}, urldate = {2020-10-04} } Threat landscape for industrial automation systems - H1 2020
Poet RAT Mailto Milum RagnarLocker REvil Ryuk Snake Ransomware
2020-09-08Lopqto's AdventuresHamidreza Babaee
@online{babaee:20200908:automated:eb3272c, author = {Hamidreza Babaee}, title = {{Automated dynamic import resolving using binary emulation}}, date = {2020-09-08}, organization = {Lopqto's Adventures}, url = {https://lopqto.me/posts/automated-dynamic-import-resolving}, language = {English}, urldate = {2020-09-09} } Automated dynamic import resolving using binary emulation
Mailto
2020-09-03ZenGoTal Be'ery
@online{beery:20200903:bitcoin:932fb45, author = {Tal Be'ery}, title = {{The Bitcoin Ransomware Detective Strikes Again: The UCSF Case}}, date = {2020-09-03}, organization = {ZenGo}, url = {https://zengo.com/bitcoin-ransomware-detective-ucsf/}, language = {English}, urldate = {2020-09-06} } The Bitcoin Ransomware Detective Strikes Again: The UCSF Case
Mailto
2020-09-01Cisco TalosDavid Liebenberg, Caitlin Huey
@online{liebenberg:20200901:quarterly:c02962b, author = {David Liebenberg and Caitlin Huey}, title = {{Quarterly Report: Incident Response trends in Summer 2020}}, date = {2020-09-01}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2020/09/CTIR-quarterly-trends-Q4-2020.html}, language = {English}, urldate = {2020-09-03} } Quarterly Report: Incident Response trends in Summer 2020
Cobalt Strike LockBit Mailto Maze Ryuk
2020-08-31The DFIR ReportThe DFIR Report
@online{report:20200831:netwalker:29a1511, author = {The DFIR Report}, title = {{NetWalker Ransomware in 1 Hour}}, date = {2020-08-31}, organization = {The DFIR Report}, url = {https://thedfirreport.com/2020/08/31/netwalker-ransomware-in-1-hour/}, language = {English}, urldate = {2020-08-31} } NetWalker Ransomware in 1 Hour
Cobalt Strike Mailto MimiKatz
2020-08-03McAfeeATR Operational Intelligence Team
@online{team:20200803:take:74e0288, author = {ATR Operational Intelligence Team}, title = {{Take a “NetWalk” on the Wild Side}}, date = {2020-08-03}, organization = {McAfee}, url = {https://www.mcafee.com/blogs/other-blogs/mcafee-labs/take-a-netwalk-on-the-wild-side/}, language = {English}, urldate = {2020-08-14} } Take a “NetWalk” on the Wild Side
Mailto
2020-08Temple UniversityCARE
@online{care:202008:critical:415c34d, author = {CARE}, title = {{Critical Infrastructure Ransomware Attacks}}, date = {2020-08}, organization = {Temple University}, url = {https://sites.temple.edu/care/ci-rw-attacks/}, language = {English}, urldate = {2020-09-15} } Critical Infrastructure Ransomware Attacks
CryptoLocker Cryptowall DoppelPaymer FriedEx Mailto Maze REvil Ryuk SamSam WannaCryptor
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 Ransomware PlugX Pony REvil Socelars STOP Ransomware Tinba TrickBot WannaCryptor
2020-07-28FBIFBI
@techreport{fbi:20200728:indicators:7dada00, author = {FBI}, title = {{Indicators Associated with Netwalker Ransomware}}, date = {2020-07-28}, institution = {FBI}, url = {https://www.ic3.gov/media/news/2020/200929-2.pdf}, language = {English}, urldate = {2020-10-05} } Indicators Associated with Netwalker Ransomware
Mailto
2020-06-26USCFUSCF
@online{uscf:20200626:update:6f5b3ca, author = {USCF}, title = {{Update on IT Security Incident at UCSF}}, date = {2020-06-26}, organization = {USCF}, url = {https://www.ucsf.edu/news/2020/06/417911/update-it-security-incident-ucsf}, language = {English}, urldate = {2020-08-18} } Update on IT Security Incident at UCSF
Mailto
2020-06-10CrowdStrikeCrowdStrike
@techreport{crowdstrike:20200610:csit20081:a09522b, author = {CrowdStrike}, title = {{CSIT-20081 : Technical Analysis Of The Netwalker Ransomware}}, date = {2020-06-10}, institution = {CrowdStrike}, url = {https://go.crowdstrike.com/rs/281-OBQ-266/images/ReportCSIT-20081e.pdf}, language = {English}, urldate = {2020-07-23} } CSIT-20081 : Technical Analysis Of The Netwalker Ransomware
Mailto
2020-06-05Github (DanusMinimus)Dan Lisichkin
@online{lisichkin:20200605:zero2auto:ecc4713, author = {Dan Lisichkin}, title = {{Zero2Auto - Netwalker Walk through}}, date = {2020-06-05}, organization = {Github (DanusMinimus)}, url = {https://danusminimus.github.io/Zero2Auto-Netwalker-Walkthrough/}, language = {English}, urldate = {2020-06-08} } Zero2Auto - Netwalker Walk through
Mailto
2020-05-28BleepingComputerIonut Ilascu
@online{ilascu:20200528:michigan:a52712f, author = {Ionut Ilascu}, title = {{Michigan State University network breached in ransomware attack}}, date = {2020-05-28}, organization = {BleepingComputer}, url = {https://www.bleepingcomputer.com/news/security/michigan-state-university-network-breached-in-ransomware-attack/}, language = {English}, urldate = {2020-05-29} } Michigan State University network breached in ransomware attack
Mailto
2020-05-27SophosLabsGabor Szappanos, Andrew Brandt
@online{szappanos:20200527:netwalker:941731e, author = {Gabor Szappanos and Andrew Brandt}, title = {{Netwalker ransomware tools give insight into threat actor}}, date = {2020-05-27}, organization = {SophosLabs}, url = {https://news.sophos.com/en-us/2020/05/27/netwalker-ransomware-tools-give-insight-into-threat-actor/}, language = {English}, urldate = {2020-05-29} } Netwalker ransomware tools give insight into threat actor
Mailto
2020-05-19Advanced IntelligenceAdvanced Intelligence, Bridgit Sullivan, Daniel Frey
@online{intelligence:20200519:netwalker:4681272, author = {Advanced Intelligence and Bridgit Sullivan and Daniel Frey}, title = {{NetWalker Ransomware Group Enters Advanced Targeting “Game”}}, date = {2020-05-19}, organization = {Advanced Intelligence}, url = {https://www.advanced-intel.com/post/netwalker-ransomware-group-enters-advanced-targeting-game}, language = {English}, urldate = {2020-05-23} } NetWalker Ransomware Group Enters Advanced Targeting “Game”
Mailto
2020-05-19zero2autoVitali Kremez
@online{kremez:20200519:netwalker:7ad1e7c, author = {Vitali Kremez}, title = {{Netwalker Ransomware - From Static Reverse Engineering to Automatic Extraction}}, date = {2020-05-19}, organization = {zero2auto}, url = {https://zero2auto.com/2020/05/19/netwalker-re/}, language = {English}, urldate = {2020-06-02} } Netwalker Ransomware - From Static Reverse Engineering to Automatic Extraction
Mailto
2020-05-18Trend MicroKaren Victor
@online{victor:20200518:netwalker:91f6d65, author = {Karen Victor}, title = {{Netwalker Fileless Ransomware Injected via Reflective Loading}}, date = {2020-05-18}, organization = {Trend Micro}, url = {https://blog.trendmicro.com/trendlabs-security-intelligence/netwalker-fileless-ransomware-injected-via-reflective-loading/}, language = {English}, urldate = {2020-05-20} } Netwalker Fileless Ransomware Injected via Reflective Loading
Mailto
2020-05-14tccontre Blogtcontre
@online{tcontre:20200514:netwalker:eabf178, author = {tcontre}, title = {{Netwalker Ransomware: [API Call Obfuscation (using Structure) and Evading Memory Forensic]}}, date = {2020-05-14}, organization = {tccontre Blog}, url = {https://tccontre.blogspot.com/2020/05/netwalker-ransomware-api-call.html}, language = {English}, urldate = {2020-05-19} } Netwalker Ransomware: [API Call Obfuscation (using Structure) and Evading Memory Forensic]
Mailto
2020-04-28MicrosoftMicrosoft Threat Protection Intelligence Team
@online{team:20200428:ransomware:3205f3a, author = {Microsoft Threat Protection Intelligence Team}, title = {{Ransomware groups continue to target healthcare, critical services; here’s how to reduce risk}}, date = {2020-04-28}, organization = {Microsoft}, url = {https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/}, language = {English}, urldate = {2020-05-05} } Ransomware groups continue to target healthcare, critical services; here’s how to reduce risk
LockBit Mailto Maze MedusaLocker Paradise Ransomware RagnarLocker REvil RobinHood
2020-04-10TrustwaveJoshua Deacon, Lloyd Macrohon
@online{deacon:20200410:indepth:13fc66f, author = {Joshua Deacon and Lloyd Macrohon}, title = {{An In-depth Look at MailTo Ransomware, Part Three of Three}}, date = {2020-04-10}, organization = {Trustwave}, url = {https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/an-in-depth-look-at-mailto-ransomware-part-three-of-three/}, language = {English}, urldate = {2020-04-14} } An In-depth Look at MailTo Ransomware, Part Three of Three
Mailto
2020-04-08TrustwaveJoshua Deacon, Lloyd Macrohon
@online{deacon:20200408:indepth:c6628d7, author = {Joshua Deacon and Lloyd Macrohon}, title = {{An In-depth Look at MailTo Ransomware, Part Two of Three}}, date = {2020-04-08}, organization = {Trustwave}, url = {https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/an-in-depth-look-at-mailto-ransomware-part-two-of-three/}, language = {English}, urldate = {2020-04-14} } An In-depth Look at MailTo Ransomware, Part Two of Three
Mailto
2020-04-08INCIBE-CERTINCIBE
@online{incibe:20200408:ransomware:61b8c41, author = {INCIBE}, title = {{Ransomware NetWalker: análisis y medidas preventivas}}, date = {2020-04-08}, organization = {INCIBE-CERT}, url = {https://www.incibe-cert.es/blog/ransomware-netwalker-analisis-y-medidas-preventivas}, language = {Spanish}, urldate = {2020-04-14} } Ransomware NetWalker: análisis y medidas preventivas
Mailto
2020-03-31TrustwaveJoshua Deacon, Lloyd Macrohon
@online{deacon:20200331:indepth:3719ebb, author = {Joshua Deacon and Lloyd Macrohon}, title = {{An In-depth Look at MailTo Ransomware, Part One of Three}}, date = {2020-03-31}, organization = {Trustwave}, url = {https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/an-in-depth-look-at-mailto-ransomware-part-one-of-three/}, language = {English}, urldate = {2020-04-14} } An In-depth Look at MailTo Ransomware, Part One of Three
Mailto
2020-03-21Bleeping ComputerLawrence Abrams
@online{abrams:20200321:netwalker:5d2936c, author = {Lawrence Abrams}, title = {{Netwalker Ransomware Infecting Users via Coronavirus Phishing}}, date = {2020-03-21}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/netwalker-ransomware-infecting-users-via-coronavirus-phishing/}, language = {English}, urldate = {2020-03-22} } Netwalker Ransomware Infecting Users via Coronavirus Phishing
Mailto
2020-02-05Bleeping ComputerLawrence Abrams
@online{abrams:20200205:mailto:3027008, author = {Lawrence Abrams}, title = {{Mailto (NetWalker) Ransomware Targets Enterprise Networks}}, date = {2020-02-05}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/mailto-netwalker-ransomware-targets-enterprise-networks/}, language = {English}, urldate = {2020-02-11} } Mailto (NetWalker) Ransomware Targets Enterprise Networks
Mailto
2019-09-05ID RansomwareAndrew Ivanov
@online{ivanov:20190905:netwalker:902cacb, author = {Andrew Ivanov}, title = {{Netwalker Ransomware}}, date = {2019-09-05}, organization = {ID Ransomware}, url = {https://id-ransomware.blogspot.com/2019/09/koko-ransomware.html}, language = {Russian}, urldate = {2020-03-22} } Netwalker Ransomware
Mailto
Yara Rules
[TLP:WHITE] win_mailto_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_mailto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mailto"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 8bc1 c1e01a 2be8 896c2430 8b6c2428 03e9 8bcd }
            // n = 7, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   c1e01a               | shl                 eax, 0x1a
            //   2be8                 | sub                 ebp, eax
            //   896c2430             | mov                 dword ptr [esp + 0x30], ebp
            //   8b6c2428             | mov                 ebp, dword ptr [esp + 0x28]
            //   03e9                 | add                 ebp, ecx
            //   8bcd                 | mov                 ecx, ebp

        $sequence_1 = { 8928 8b442414 8901 5d 5f 5e 8bc3 }
            // n = 7, score = 200
            //   8928                 | mov                 dword ptr [eax], ebp
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   5d                   | pop                 ebp
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8bc3                 | mov                 eax, ebx

        $sequence_2 = { e8???????? 8bd0 83c408 85d2 7464 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   83c408               | add                 esp, 8
            //   85d2                 | test                edx, edx
            //   7464                 | je                  0x66

        $sequence_3 = { 57 e8???????? 8bf0 83c408 85f6 0f8410feffff 8b4c2418 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c408               | add                 esp, 8
            //   85f6                 | test                esi, esi
            //   0f8410feffff         | je                  0xfffffe16
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]

        $sequence_4 = { 50 8d8424d8000000 50 e8???????? 8d8424dc000000 50 8d442448 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8d8424d8000000       | lea                 eax, [esp + 0xd8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8424dc000000       | lea                 eax, [esp + 0xdc]
            //   50                   | push                eax
            //   8d442448             | lea                 eax, [esp + 0x48]

        $sequence_5 = { 56 8b742428 56 8b4034 ffd0 83c408 85c0 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8b742428             | mov                 esi, dword ptr [esp + 0x28]
            //   56                   | push                esi
            //   8b4034               | mov                 eax, dword ptr [eax + 0x34]
            //   ffd0                 | call                eax
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_6 = { e8???????? 83c404 5b a1???????? 85c0 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   5b                   | pop                 ebx
            //   a1????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_7 = { 56 898188000000 e8???????? 8b0d???????? 6812322281 56 89818c000000 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   898188000000         | mov                 dword ptr [ecx + 0x88], eax
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   6812322281           | push                0x81223212
            //   56                   | push                esi
            //   89818c000000         | mov                 dword ptr [ecx + 0x8c], eax

        $sequence_8 = { e8???????? 83c404 8907 85c0 7458 8b4310 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8907                 | mov                 dword ptr [edi], eax
            //   85c0                 | test                eax, eax
            //   7458                 | je                  0x5a
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]

        $sequence_9 = { 0f84aa000000 8944241c 85c9 0f8467ffffff 83c30c f60301 745b }
            // n = 7, score = 200
            //   0f84aa000000         | je                  0xb0
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax
            //   85c9                 | test                ecx, ecx
            //   0f8467ffffff         | je                  0xffffff6d
            //   83c30c               | add                 ebx, 0xc
            //   f60301               | test                byte ptr [ebx], 1
            //   745b                 | je                  0x5d

    condition:
        7 of them and filesize < 180224
}
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