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 (20210616 | Detects win.divergent.)
rule win_divergent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.divergent."
        info = "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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { c60600 46 48 75f9 5e 5d c3 }
            // n = 7, score = 300
            //   c60600               | mov                 byte ptr [esi], 0
            //   46                   | inc                 esi
            //   48                   | dec                 eax
            //   75f9                 | jne                 0xfffffffb
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_1 = { e8???????? c7042488130000 ff7620 ff15???????? }
            // n = 4, score = 300
            //   e8????????           |                     
            //   c7042488130000       | mov                 dword ptr [esp], 0x1388
            //   ff7620               | push                dword ptr [esi + 0x20]
            //   ff15????????         |                     

        $sequence_2 = { 50 8d45a8 50 53 6a1a ff15???????? }
            // n = 6, score = 300
            //   50                   | push                eax
            //   8d45a8               | lea                 eax, dword ptr [ebp - 0x58]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   6a1a                 | push                0x1a
            //   ff15????????         |                     

        $sequence_3 = { 56 e8???????? 8b85d0feffff 83c408 660f6ec0 }
            // n = 5, score = 300
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b85d0feffff         | mov                 eax, dword ptr [ebp - 0x130]
            //   83c408               | add                 esp, 8
            //   660f6ec0             | movd                xmm0, eax

        $sequence_4 = { ff7508 ff15???????? 83c414 8be5 5d c3 55 }
            // n = 7, score = 300
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   83c414               | add                 esp, 0x14
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_5 = { b980000000 83fa01 7508 0fb60e e9???????? 83fa02 751d }
            // n = 7, score = 300
            //   b980000000           | mov                 ecx, 0x80
            //   83fa01               | cmp                 edx, 1
            //   7508                 | jne                 0xa
            //   0fb60e               | movzx               ecx, byte ptr [esi]
            //   e9????????           |                     
            //   83fa02               | cmp                 edx, 2
            //   751d                 | jne                 0x1f

        $sequence_6 = { e8???????? 83c40c 85ff 7423 ff760c ff15???????? 85c0 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85ff                 | test                edi, edi
            //   7423                 | je                  0x25
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_7 = { 895e04 33c0 897e0c 5e 5b 5f 5d }
            // n = 7, score = 300
            //   895e04               | mov                 dword ptr [esi + 4], ebx
            //   33c0                 | xor                 eax, eax
            //   897e0c               | mov                 dword ptr [esi + 0xc], edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp

        $sequence_8 = { e8???????? 59 85f6 7505 47 3bfb 7280 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85f6                 | test                esi, esi
            //   7505                 | jne                 7
            //   47                   | inc                 edi
            //   3bfb                 | cmp                 edi, ebx
            //   7280                 | jb                  0xffffff82

        $sequence_9 = { e8???????? eb21 399df0feffff 750c ffb5e0feffff e8???????? 59 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   eb21                 | jmp                 0x23
            //   399df0feffff         | cmp                 dword ptr [ebp - 0x110], ebx
            //   750c                 | jne                 0xe
            //   ffb5e0feffff         | push                dword ptr [ebp - 0x120]
            //   e8????????           |                     
            //   59                   | pop                 ecx

    condition:
        7 of them and filesize < 212992
}
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