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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_divergent_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.divergent"
        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 = { 668975dc 66894de6 66894dea 668975f2 668955f4 668975f8 668975fc }
            // n = 7, score = 300
            //   668975dc             | mov                 word ptr [ebp - 0x24], si
            //   66894de6             | mov                 word ptr [ebp - 0x1a], cx
            //   66894dea             | mov                 word ptr [ebp - 0x16], cx
            //   668975f2             | mov                 word ptr [ebp - 0xe], si
            //   668955f4             | mov                 word ptr [ebp - 0xc], dx
            //   668975f8             | mov                 word ptr [ebp - 8], si
            //   668975fc             | mov                 word ptr [ebp - 4], si

        $sequence_1 = { 85c9 0f853effffff eb03 8b4dfc 85c9 7406 8b01 }
            // n = 7, score = 300
            //   85c9                 | test                ecx, ecx
            //   0f853effffff         | jne                 0xffffff44
            //   eb03                 | jmp                 5
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   85c9                 | test                ecx, ecx
            //   7406                 | je                  8
            //   8b01                 | mov                 eax, dword ptr [ecx]

        $sequence_2 = { ffd7 6803010000 8d8575feffff c68574feffff00 6a00 50 e8???????? }
            // n = 7, score = 300
            //   ffd7                 | call                edi
            //   6803010000           | push                0x103
            //   8d8575feffff         | lea                 eax, [ebp - 0x18b]
            //   c68574feffff00       | mov                 byte ptr [ebp - 0x18c], 0
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_3 = { ff75f8 ff75fc ff750c e8???????? 83c424 85c0 }
            // n = 6, score = 300
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   83c424               | add                 esp, 0x24
            //   85c0                 | test                eax, eax

        $sequence_4 = { ff15???????? 8d45f0 50 ff15???????? 8b45f8 3b45f0 750c }
            // n = 7, score = 300
            //   ff15????????         |                     
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   3b45f0               | cmp                 eax, dword ptr [ebp - 0x10]
            //   750c                 | jne                 0xe

        $sequence_5 = { 59 85c0 7462 ff750c ffd3 50 ff750c }
            // n = 7, score = 300
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7462                 | je                  0x64
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ffd3                 | call                ebx
            //   50                   | push                eax
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_6 = { 6888130000 8bf8 ff15???????? ff15???????? 2bc7 b9a00f0000 3bc8 }
            // n = 7, score = 300
            //   6888130000           | push                0x1388
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     
            //   ff15????????         |                     
            //   2bc7                 | sub                 eax, edi
            //   b9a00f0000           | mov                 ecx, 0xfa0
            //   3bc8                 | cmp                 ecx, eax

        $sequence_7 = { 7505 8b4608 eb03 83c8ff 5e 5d }
            // n = 6, score = 300
            //   7505                 | jne                 7
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   eb03                 | jmp                 5
            //   83c8ff               | or                  eax, 0xffffffff
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_8 = { 33ff 57 ff35???????? 893b e8???????? 50 894508 }
            // n = 7, score = 300
            //   33ff                 | xor                 edi, edi
            //   57                   | push                edi
            //   ff35????????         |                     
            //   893b                 | mov                 dword ptr [ebx], edi
            //   e8????????           |                     
            //   50                   | push                eax
            //   894508               | mov                 dword ptr [ebp + 8], eax

        $sequence_9 = { 56 ffd3 40 50 56 ff75f8 ffd3 }
            // n = 7, score = 300
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ffd3                 | call                ebx

    condition:
        7 of them and filesize < 212992
}
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