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
@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
2019-10-01Trend 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
2019-09-26Cisco 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
2019-09-26MicrosoftMicrosoft 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
2019-01-10Cert-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 (20220808 | Detects win.divergent.)
rule win_divergent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8d85ccfeffff 6a00 50 e8???????? 83c41c c785c8feffff1c010000 }
            // n = 6, score = 300
            //   8d85ccfeffff         | lea                 eax, [ebp - 0x134]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   c785c8feffff1c010000     | mov    dword ptr [ebp - 0x138], 0x11c

        $sequence_1 = { 75e6 33c0 40 5f 5e 5d c3 }
            // n = 7, score = 300
            //   75e6                 | jne                 0xffffffe8
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_2 = { 83c410 85ff 0f88b2feffff 85f6 }
            // n = 4, score = 300
            //   83c410               | add                 esp, 0x10
            //   85ff                 | test                edi, edi
            //   0f88b2feffff         | js                  0xfffffeb8
            //   85f6                 | test                esi, esi

        $sequence_3 = { 85c0 7435 8b7df8 46 f685f4feffff01 740f 8d8574feffff }
            // n = 7, score = 300
            //   85c0                 | test                eax, eax
            //   7435                 | je                  0x37
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]
            //   46                   | inc                 esi
            //   f685f4feffff01       | test                byte ptr [ebp - 0x10c], 1
            //   740f                 | je                  0x11
            //   8d8574feffff         | lea                 eax, [ebp - 0x18c]

        $sequence_4 = { 6a02 6a08 50 ff15???????? 56 }
            // n = 5, score = 300
            //   6a02                 | push                2
            //   6a08                 | push                8
            //   50                   | push                eax
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_5 = { ff11 85c0 786e 8d85c8fbffff 50 e8???????? 8d85d0fdffff }
            // n = 7, score = 300
            //   ff11                 | call                dword ptr [ecx]
            //   85c0                 | test                eax, eax
            //   786e                 | js                  0x70
            //   8d85c8fbffff         | lea                 eax, [ebp - 0x438]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d85d0fdffff         | lea                 eax, [ebp - 0x230]

        $sequence_6 = { 58 0f44d8 47 3bfe 72d8 8b75f4 56 }
            // n = 7, score = 300
            //   58                   | pop                 eax
            //   0f44d8               | cmove               ebx, eax
            //   47                   | inc                 edi
            //   3bfe                 | cmp                 edi, esi
            //   72d8                 | jb                  0xffffffda
            //   8b75f4               | mov                 esi, dword ptr [ebp - 0xc]
            //   56                   | push                esi

        $sequence_7 = { 8b45fc 59 8d4df4 51 6800100000 56 6a00 }
            // n = 7, score = 300
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   59                   | pop                 ecx
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   51                   | push                ecx
            //   6800100000           | push                0x1000
            //   56                   | push                esi
            //   6a00                 | push                0

        $sequence_8 = { 33c0 3945fc 0f94c0 8945fc eb58 }
            // n = 5, score = 300
            //   33c0                 | xor                 eax, eax
            //   3945fc               | cmp                 dword ptr [ebp - 4], eax
            //   0f94c0               | sete                al
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   eb58                 | jmp                 0x5a

        $sequence_9 = { 837d1400 741d 68???????? 56 e8???????? 59 }
            // n = 6, score = 300
            //   837d1400             | cmp                 dword ptr [ebp + 0x14], 0
            //   741d                 | je                  0x1f
            //   68????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

    condition:
        7 of them and filesize < 212992
}
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