SYMBOLCOMMON_NAMEaka. SYNONYMS
win.divergent (Back to overview)

Divergent

aka: Novter

There is no description at this point.

References
2019-10-01Trend MicroJaromír Hořejší, Joseph C. Chen
@techreport{hoej:20191001:new:4a49a90, author = {Jaromír Hořejší and Joseph C. Chen}, title = {{New Fileless Botnet Novter Distributed by KovCoreG Malvertising Campaign}}, date = {2019-10-01}, institution = {Trend Micro}, url = {https://documents.trendmicro.com/assets/Tech-Brief-New-Fileless-Botnet-Novter-Distributed-by-KovCoreG-Malvertising-Campaign.pdf}, language = {English}, urldate = {2019-12-18} } New Fileless Botnet Novter Distributed by KovCoreG Malvertising Campaign
Divergent
2019-10-01Trend MicroJaromír Hořejší, Joseph C. Chen
@online{hoej:20191001:new:feb95a9, author = {Jaromír Hořejší and Joseph C. Chen}, title = {{New Fileless Botnet Novter Distributed by KovCoreG Malvertising Campaign}}, date = {2019-10-01}, organization = {Trend Micro}, url = {https://blog.trendmicro.com/trendlabs-security-intelligence/new-fileless-botnet-novter-distributed-by-kovcoreg-malvertising-campaign/}, language = {English}, urldate = {2019-10-15} } New Fileless Botnet Novter Distributed by KovCoreG Malvertising Campaign
Divergent
2019-09-26MicrosoftMicrosoft Defender ATP Research Team
@online{team:20190926:bring:d73d53e, author = {Microsoft Defender ATP Research Team}, title = {{Bring your own LOLBin: Multi-stage, fileless Nodersok campaign delivers rare Node.js-based malware}}, date = {2019-09-26}, organization = {Microsoft}, url = {https://www.microsoft.com/security/blog/2019/09/26/bring-your-own-lolbin-multi-stage-fileless-nodersok-campaign-delivers-rare-node-js-based-malware/}, language = {English}, urldate = {2020-05-18} } Bring your own LOLBin: Multi-stage, fileless Nodersok campaign delivers rare Node.js-based malware
Divergent
2019-09-26Cisco TalosEdmund Brumaghin
@online{brumaghin:20190926:divergent:2d282a0, author = {Edmund Brumaghin}, title = {{Divergent: "Fileless" NodeJS Malware Burrows Deep Within the Host}}, date = {2019-09-26}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2019/09/divergent-analysis.html}, language = {English}, urldate = {2019-10-24} } Divergent: "Fileless" NodeJS Malware Burrows Deep Within the Host
Divergent
2019-01-10Cert-PaCert-PA
@online{certpa:20190110:divergent:c0ab442, author = {Cert-PA}, title = {{“Divergent” malware Fileless}}, date = {2019-01-10}, organization = {Cert-Pa}, url = {https://www.cert-pa.it/notizie/devergent-malware-fileless/}, language = {Italian}, urldate = {2019-11-23} } “Divergent” malware Fileless
Divergent
Yara Rules
[TLP:WHITE] win_divergent_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_divergent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.divergent"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 8b45f8 41 894dfc 3bc8 0f82e8feffff 85c0 }
            // n = 6, score = 300
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   41                   | inc                 ecx
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   3bc8                 | cmp                 ecx, eax
            //   0f82e8feffff         | jb                  0xfffffeee
            //   85c0                 | test                eax, eax

        $sequence_1 = { ff7508 8bd8 e8???????? 68???????? ff7508 8bf0 e8???????? }
            // n = 7, score = 300
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bd8                 | mov                 ebx, eax
            //   e8????????           |                     
            //   68????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     

        $sequence_2 = { 8d85f1feffff c685f0feffff00 6a00 50 e8???????? 83c40c 33c0 }
            // n = 7, score = 300
            //   8d85f1feffff         | lea                 eax, [ebp - 0x10f]
            //   c685f0feffff00       | mov                 byte ptr [ebp - 0x110], 0
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 50 ebdd 33c0 5e 5d c3 55 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   ebdd                 | jmp                 0xffffffdf
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_4 = { e8???????? 59 ff760c 8bd8 ffd7 40 50 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   8bd8                 | mov                 ebx, eax
            //   ffd7                 | call                edi
            //   40                   | inc                 eax
            //   50                   | push                eax

        $sequence_5 = { 7410 0375fc 3bf7 72e9 33c0 40 5f }
            // n = 7, score = 300
            //   7410                 | je                  0x12
            //   0375fc               | add                 esi, dword ptr [ebp - 4]
            //   3bf7                 | cmp                 esi, edi
            //   72e9                 | jb                  0xffffffeb
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   5f                   | pop                 edi

        $sequence_6 = { 50 e8???????? 8bdf 59 }
            // n = 4, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bdf                 | mov                 ebx, edi
            //   59                   | pop                 ecx

        $sequence_7 = { ff750c 394d10 6aff 0f44c1 50 57 }
            // n = 6, score = 300
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   394d10               | cmp                 dword ptr [ebp + 0x10], ecx
            //   6aff                 | push                -1
            //   0f44c1               | cmove               eax, ecx
            //   50                   | push                eax
            //   57                   | push                edi

        $sequence_8 = { 0f88b2feffff 85f6 7402 03f7 85db 8b5d14 }
            // n = 6, score = 300
            //   0f88b2feffff         | js                  0xfffffeb8
            //   85f6                 | test                esi, esi
            //   7402                 | je                  4
            //   03f7                 | add                 esi, edi
            //   85db                 | test                ebx, ebx
            //   8b5d14               | mov                 ebx, dword ptr [ebp + 0x14]

        $sequence_9 = { 895dfc 59 85db 0f84ca000000 56 33f6 8bd6 }
            // n = 7, score = 300
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   59                   | pop                 ecx
            //   85db                 | test                ebx, ebx
            //   0f84ca000000         | je                  0xd0
            //   56                   | push                esi
            //   33f6                 | xor                 esi, esi
            //   8bd6                 | mov                 edx, esi

    condition:
        7 of them and filesize < 212992
}
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