SYMBOLCOMMON_NAMEaka. SYNONYMS
win.nefilim (Back to overview)

Nefilim Ransomware

aka: Nephilim Ransomware

According to Vitali Kremez and Michael Gillespie, this ransomware shares much code with Nemty 2.5. A difference is removal of the RaaS component, which was switched to email communications for payments. Uses AES-128, which is then protected RSA2048.

References
2020-07-15FireEyeNathan Brubaker, Daniel Kapellmann Zafra, Keith Lunden, Ken Proska, Corey Hildebrandt
@online{brubaker:20200715:financially:f217555, author = {Nathan Brubaker and Daniel Kapellmann Zafra and Keith Lunden and Ken Proska and Corey Hildebrandt}, title = {{Financially Motivated Actors Are Expanding Access Into OT: Analysis of Kill Lists That Include OT Processes Used With Seven Malware Families}}, date = {2020-07-15}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2020/07/financially-motivated-actors-are-expanding-access-into-ot.html}, language = {English}, urldate = {2020-07-16} } Financially Motivated Actors Are Expanding Access Into OT: Analysis of Kill Lists That Include OT Processes Used With Seven Malware Families
DoppelPaymer LockerGoga Maze MegaCortex Nefilim Ransomware Snake Ransomware
2020-06-16New Zealand CERTNew Zealand CERT
@online{cert:20200616:active:1c01229, author = {New Zealand CERT}, title = {{Active ransomware campaign leveraging remote access technologies}}, date = {2020-06-16}, organization = {New Zealand CERT}, url = {https://www.cert.govt.nz/it-specialists/advisories/active-ransomware-campaign-leveraging-remote-access-technologies/}, language = {English}, urldate = {2020-06-21} } Active ransomware campaign leveraging remote access technologies
Nefilim Ransomware
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
2020-03-24Bleeping 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
2020-03-23Trend MicroTrend Micro
@online{micro:20200323:nefilim:aaca451, author = {Trend Micro}, title = {{Nefilim Ransomware Threatens to Expose Stolen Data}}, date = {2020-03-23}, organization = {Trend Micro}, url = {https://www.trendmicro.com/vinfo/us/security/news/cybercrime-and-digital-threats/nefilim-ransomware-threatens-to-expose-stolen-data}, language = {English}, urldate = {2020-06-22} } Nefilim Ransomware Threatens to Expose Stolen Data
Nefilim Ransomware
2020-03-17Bleeping ComputerLawrence Abrams
@online{abrams:20200317:new:d6fa158, author = {Lawrence Abrams}, title = {{New Nefilim Ransomware Threatens to Release Victims' Data}}, date = {2020-03-17}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/new-nefilim-ransomware-threatens-to-release-victims-data/}, language = {English}, urldate = {2020-03-19} } New Nefilim Ransomware Threatens to Release Victims' Data
Nefilim Ransomware
2020-03-14ID RansomwareAndrew Ivanov
@online{ivanov:20200314:nefilim:329ccf1, author = {Andrew Ivanov}, title = {{Nefilim Ransomware}}, date = {2020-03-14}, organization = {ID Ransomware}, url = {https://id-ransomware.blogspot.com/2020/03/nefilim-ransomware.html}, language = {English}, urldate = {2020-03-22} } Nefilim Ransomware
Nefilim Ransomware
Yara Rules
[TLP:WHITE] win_nefilim_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_nefilim_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.nefilim"
        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 = { 8bce c6040100 8bc6 5b c3 6a0c }
            // n = 6, score = 200
            //   8bce                 | mov                 ecx, esi
            //   c6040100             | mov                 byte ptr [ecx + eax], 0
            //   8bc6                 | mov                 eax, esi
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   6a0c                 | push                0xc

        $sequence_1 = { 8d4c246c 8d442450 7461 e8???????? 8d4c2418 51 }
            // n = 6, score = 200
            //   8d4c246c             | lea                 ecx, [esp + 0x6c]
            //   8d442450             | lea                 eax, [esp + 0x50]
            //   7461                 | je                  0x63
            //   e8????????           |                     
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   51                   | push                ecx

        $sequence_2 = { 8d742444 e8???????? 6a01 33ff 8d7508 e8???????? }
            // n = 6, score = 200
            //   8d742444             | lea                 esi, [esp + 0x44]
            //   e8????????           |                     
            //   6a01                 | push                1
            //   33ff                 | xor                 edi, edi
            //   8d7508               | lea                 esi, [ebp + 8]
            //   e8????????           |                     

        $sequence_3 = { 7405 83f804 754a 6a04 56 ffd3 50 }
            // n = 7, score = 200
            //   7405                 | je                  7
            //   83f804               | cmp                 eax, 4
            //   754a                 | jne                 0x4c
            //   6a04                 | push                4
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   50                   | push                eax

        $sequence_4 = { 8d4508 8d4c2454 89742468 897c2464 }
            // n = 4, score = 200
            //   8d4508               | lea                 eax, [ebp + 8]
            //   8d4c2454             | lea                 ecx, [esp + 0x54]
            //   89742468             | mov                 dword ptr [esp + 0x68], esi
            //   897c2464             | mov                 dword ptr [esp + 0x64], edi

        $sequence_5 = { eb0f e8???????? e8???????? e8???????? 6a00 }
            // n = 5, score = 200
            //   eb0f                 | jmp                 0x11
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   6a00                 | push                0

        $sequence_6 = { 6a01 33ff 8db5bcfdffff e8???????? 6a01 8db5d8fdffff e8???????? }
            // n = 7, score = 200
            //   6a01                 | push                1
            //   33ff                 | xor                 edi, edi
            //   8db5bcfdffff         | lea                 esi, [ebp - 0x244]
            //   e8????????           |                     
            //   6a01                 | push                1
            //   8db5d8fdffff         | lea                 esi, [ebp - 0x228]
            //   e8????????           |                     

        $sequence_7 = { 7405 83f804 754a 6a04 56 }
            // n = 5, score = 200
            //   7405                 | je                  7
            //   83f804               | cmp                 eax, 4
            //   754a                 | jne                 0x4c
            //   6a04                 | push                4
            //   56                   | push                esi

        $sequence_8 = { ff74241c ffd7 53 8d442434 }
            // n = 4, score = 200
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   ffd7                 | call                edi
            //   53                   | push                ebx
            //   8d442434             | lea                 eax, [esp + 0x34]

        $sequence_9 = { ffd6 85c0 0f8484040000 68???????? 8d8424d0000000 }
            // n = 5, score = 200
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   0f8484040000         | je                  0x48a
            //   68????????           |                     
            //   8d8424d0000000       | lea                 eax, [esp + 0xd0]

    condition:
        7 of them and filesize < 142336
}
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