SYMBOLCOMMON_NAMEaka. SYNONYMS
win.nemty (Back to overview)

Nemty


Nemty is a ransomware that was discovered in September 2019. Fortinet states that they found it being distributed through similar ways as Sodinokibi and also noted artfifacts they had seen before in Gandcrab.

References
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
2020-05-04SentinelOneJim Walter
@online{walter:20200504:meet:7943fa2, author = {Jim Walter}, title = {{Meet NEMTY Successor, Nefilim/Nephilim Ransomware}}, date = {2020-05-04}, organization = {SentinelOne}, url = {https://labs.sentinelone.com/meet-nemty-successor-nefilim-nephilim-ransomware/}, language = {English}, urldate = {2020-06-22} } Meet NEMTY Successor, Nefilim/Nephilim Ransomware
Nefilim Ransomware Nemty
2020-04-02McAfeeAlexandre Mundo, Marc Rivero López
@online{mundo:20200402:nemty:96afa32, author = {Alexandre Mundo and Marc Rivero López}, title = {{Nemty Ransomware – Learning by Doing}}, date = {2020-04-02}, organization = {McAfee}, url = {https://www.mcafee.com/blogs/other-blogs/mcafee-labs/nemty-ransomware-learning-by-doing/}, language = {English}, urldate = {2020-04-08} } Nemty Ransomware – Learning by Doing
Nemty
2020-03-24Bleeping ComputerLawrence Abrams
@online{abrams:20200324:three:fb92d03, author = {Lawrence Abrams}, title = {{Three More Ransomware Families Create Sites to Leak Stolen Data}}, date = {2020-03-24}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/three-more-ransomware-families-create-sites-to-leak-stolen-data/}, language = {English}, urldate = {2020-03-26} } Three More Ransomware Families Create Sites to Leak Stolen Data
Clop DoppelPaymer Maze Nefilim Ransomware Nemty REvil
2020-02-18LastlineJason Zhang, Stefano Ortolani
@online{zhang:20200218:nemty:8d6340a, author = {Jason Zhang and Stefano Ortolani}, title = {{Nemty Ransomware Scaling UP: APAC Mailboxes Swarmed by Dual Downloaders}}, date = {2020-02-18}, organization = {Lastline}, url = {https://www.lastline.com/labsblog/nemty-ransomware-scaling-up-apac-mailboxes-swarmed-dual-downloaders/}, language = {English}, urldate = {2020-02-23} } Nemty Ransomware Scaling UP: APAC Mailboxes Swarmed by Dual Downloaders
Nemty Phorpiex
2020-01-10Github (albertzsigovits)Albert Zsigovits
@online{zsigovits:20200110:nemty:7575d77, author = {Albert Zsigovits}, title = {{Nemty ransomware}}, date = {2020-01-10}, organization = {Github (albertzsigovits)}, url = {https://github.com/albertzsigovits/malware-notes/blob/master/Nemty.md}, language = {English}, urldate = {2020-01-14} } Nemty ransomware
Nemty
2019-11-04SymantecNguyen Hoang Giang, Eduardo Altares, Muhammad Hasib Latif
@online{giang:20191104:nemty:6f237c6, author = {Nguyen Hoang Giang and Eduardo Altares and Muhammad Hasib Latif}, title = {{Nemty Ransomware Expands Its Reach, Also Delivered by Trik Botnet}}, date = {2019-11-04}, organization = {Symantec}, url = {https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/nemty-ransomware-trik-botnet}, language = {English}, urldate = {2020-06-02} } Nemty Ransomware Expands Its Reach, Also Delivered by Trik Botnet
Nemty Phorpiex
2019-10-10Bleeping ComputerLawrence Abrams
@online{abrams:20191010:nemty:319e3b7, author = {Lawrence Abrams}, title = {{Nemty Ransomware Decryptor Released, Recover Files for Free}}, date = {2019-10-10}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/nemty-ransomware-decryptor-released-recover-files-for-free/}, language = {English}, urldate = {2020-01-09} } Nemty Ransomware Decryptor Released, Recover Files for Free
Nemty
2019-10-10TesorionFrank van den Hurk
@online{hurk:20191010:nemty:3be8553, author = {Frank van den Hurk}, title = {{Nemty update: decryptors for Nemty 1.5 and 1.6}}, date = {2019-10-10}, organization = {Tesorion}, url = {https://www.tesorion.nl/nemty-update-decryptors-for-nemty-1-5-and-1-6/}, language = {English}, urldate = {2019-10-23} } Nemty update: decryptors for Nemty 1.5 and 1.6
Nemty
2019-09-17FortinetJoie Salvio
@online{salvio:20190917:nemty:761b43e, author = {Joie Salvio}, title = {{Nemty Ransomware 1.0: A Threat in its Early Stage}}, date = {2019-09-17}, organization = {Fortinet}, url = {https://www.fortinet.com/blog/threat-research/nemty-ransomware-early-stage-threat.html}, language = {English}, urldate = {2020-01-13} } Nemty Ransomware 1.0: A Threat in its Early Stage
Nemty
2019-09-08Bleeping ComputerIonut Ilascu
@online{ilascu:20190908:fake:3f0addd, author = {Ionut Ilascu}, title = {{Fake PayPal Site Spreads Nemty Ransomware}}, date = {2019-09-08}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/fake-paypal-site-spreads-nemty-ransomware/}, language = {English}, urldate = {2020-01-13} } Fake PayPal Site Spreads Nemty Ransomware
Nemty
2019-09-03Bleeping ComputerIonut Ilascu
@online{ilascu:20190903:nemty:459166a, author = {Ionut Ilascu}, title = {{Nemty Ransomware Gets Distribution from RIG Exploit Kit}}, date = {2019-09-03}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/nemty-ransomware-gets-distribution-from-rig-exploit-kit/}, language = {English}, urldate = {2020-01-08} } Nemty Ransomware Gets Distribution from RIG Exploit Kit
Nemty
2019-08-26Bleeping ComputerIonut Ilascu
@online{ilascu:20190826:new:20f0561, author = {Ionut Ilascu}, title = {{New Nemty Ransomware May Spread via Compromised RDP Connections}}, date = {2019-08-26}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/new-nemty-ransomware-may-spread-via-compromised-rdp-connections/}, language = {English}, urldate = {2020-01-07} } New Nemty Ransomware May Spread via Compromised RDP Connections
Nemty
2019-08-24Github (k-vitali)Vitali Kremez
@online{kremez:20190824:notes:486e04c, author = {Vitali Kremez}, title = {{Notes on Nemty Ransomware}}, date = {2019-08-24}, organization = {Github (k-vitali)}, url = {https://raw.githubusercontent.com/k-vitali/Malware-Misc-RE/master/2019-08-24-nemty-ransomware-notes.vk.raw}, language = {English}, urldate = {2020-01-13} } Notes on Nemty Ransomware
Nemty
Yara Rules
[TLP:WHITE] win_nemty_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_nemty_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.nemty"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 3bd9 732a 8b17 3bd3 7724 2bc2 }
            // n = 6, score = 200
            //   3bd9                 | cmp                 ebx, ecx
            //   732a                 | jae                 0x2c
            //   8b17                 | mov                 edx, dword ptr [edi]
            //   3bd3                 | cmp                 edx, ebx
            //   7724                 | ja                  0x26
            //   2bc2                 | sub                 eax, edx

        $sequence_1 = { 8d45c4 8bf0 0fbe0418 50 }
            // n = 4, score = 200
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   8bf0                 | mov                 esi, eax
            //   0fbe0418             | movsx               eax, byte ptr [eax + ebx]
            //   50                   | push                eax

        $sequence_2 = { 56 e8???????? 59 8bce be???????? e8???????? 57 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bce                 | mov                 ecx, esi
            //   be????????           |                     
            //   e8????????           |                     
            //   57                   | push                edi

        $sequence_3 = { 55 8bec 56 8bf0 83661000 57 }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi
            //   8bf0                 | mov                 esi, eax
            //   83661000             | and                 dword ptr [esi + 0x10], 0
            //   57                   | push                edi

        $sequence_4 = { 55 8bec 51 56 57 ff7534 e8???????? }
            // n = 7, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff7534               | push                dword ptr [ebp + 0x34]
            //   e8????????           |                     

        $sequence_5 = { e8???????? a1???????? 83c40c 393d???????? 7302 8bc6 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   393d????????         |                     
            //   7302                 | jae                 4
            //   8bc6                 | mov                 eax, esi

        $sequence_6 = { e8???????? 33db 43 53 33ff 8d75e0 e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   33db                 | xor                 ebx, ebx
            //   43                   | inc                 ebx
            //   53                   | push                ebx
            //   33ff                 | xor                 edi, edi
            //   8d75e0               | lea                 esi, [ebp - 0x20]
            //   e8????????           |                     

        $sequence_7 = { c20400 8b4f04 53 8bd8 56 }
            // n = 5, score = 200
            //   c20400               | ret                 4
            //   8b4f04               | mov                 ecx, dword ptr [edi + 4]
            //   53                   | push                ebx
            //   8bd8                 | mov                 ebx, eax
            //   56                   | push                esi

        $sequence_8 = { 33ff 8d75a0 894594 e8???????? }
            // n = 4, score = 200
            //   33ff                 | xor                 edi, edi
            //   8d75a0               | lea                 esi, [ebp - 0x60]
            //   894594               | mov                 dword ptr [ebp - 0x6c], eax
            //   e8????????           |                     

        $sequence_9 = { 8b75bc 85f6 782e 837df410 8b7de0 8bc7 }
            // n = 6, score = 200
            //   8b75bc               | mov                 esi, dword ptr [ebp - 0x44]
            //   85f6                 | test                esi, esi
            //   782e                 | js                  0x30
            //   837df410             | cmp                 dword ptr [ebp - 0xc], 0x10
            //   8b7de0               | mov                 edi, dword ptr [ebp - 0x20]
            //   8bc7                 | mov                 eax, edi

    condition:
        7 of them and filesize < 204800
}
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