SYMBOLCOMMON_NAMEaka. SYNONYMS
win.navrat (Back to overview)

NavRAT

Actor(s): APT37


There is no description at this point.

References
2020-02-19LexfoLexfo
@techreport{lexfo:20200219:lazarus:f293c37, author = {Lexfo}, title = {{The Lazarus Constellation A study on North Korean malware}}, date = {2020-02-19}, institution = {Lexfo}, url = {https://blog.lexfo.fr/ressources/Lexfo-WhitePaper-The_Lazarus_Constellation.pdf}, language = {English}, urldate = {2020-03-11} } The Lazarus Constellation A study on North Korean malware
FastCash AppleJeus BADCALL Bankshot Brambul Dtrack Duuzer DYEPACK ELECTRICFISH HARDRAIN Hermes HOPLIGHT Joanap KEYMARBLE Kimsuky MimiKatz MyDoom NACHOCHEESE NavRAT PowerRatankba RokRAT Sierra(Alfa,Bravo, ...) Volgmer WannaCryptor
2019-02-25One Night in NorfolkKevin Perlow
@online{perlow:20190225:how:d4a68d6, author = {Kevin Perlow}, title = {{How To: Analyzing a Malicious Hangul Word Processor Document from a DPRK Threat Actor Group}}, date = {2019-02-25}, organization = {One Night in Norfolk}, url = {https://norfolkinfosec.com/how-to-analyzing-a-malicious-hangul-word-processor-document-from-a-dprk-threat-actor-group/}, language = {English}, urldate = {2020-05-19} } How To: Analyzing a Malicious Hangul Word Processor Document from a DPRK Threat Actor Group
NavRAT
2018-05-31Cisco TalosWarren Mercer, Paul Rascagnères, Jungsoo An
@online{mercer:20180531:navrat:bf68765, author = {Warren Mercer and Paul Rascagnères and Jungsoo An}, title = {{NavRAT Uses US-North Korea Summit As Decoy For Attacks In South Korea}}, date = {2018-05-31}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2018/05/navrat.html?m=1}, language = {English}, urldate = {2020-01-08} } NavRAT Uses US-North Korea Summit As Decoy For Attacks In South Korea
NavRAT
Yara Rules
[TLP:WHITE] win_navrat_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_navrat_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.navrat"
        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 = { 56 50 57 a3???????? ff15???????? 57 }
            // n = 6, score = 300
            //   56                   | push                esi
            //   50                   | push                eax
            //   57                   | push                edi
            //   a3????????           |                     
            //   ff15????????         |                     
            //   57                   | push                edi

        $sequence_1 = { c745dc726f736f c745e066745c57 c745e4696e646f c745e877735c43 c745ec75727265 c745f06e745665 c745f47273696f }
            // n = 7, score = 300
            //   c745dc726f736f       | mov                 dword ptr [ebp - 0x24], 0x6f736f72
            //   c745e066745c57       | mov                 dword ptr [ebp - 0x20], 0x575c7466
            //   c745e4696e646f       | mov                 dword ptr [ebp - 0x1c], 0x6f646e69
            //   c745e877735c43       | mov                 dword ptr [ebp - 0x18], 0x435c7377
            //   c745ec75727265       | mov                 dword ptr [ebp - 0x14], 0x65727275
            //   c745f06e745665       | mov                 dword ptr [ebp - 0x10], 0x6556746e
            //   c745f47273696f       | mov                 dword ptr [ebp - 0xc], 0x6f697372

        $sequence_2 = { 85f6 7407 8b7608 83461c02 5f }
            // n = 5, score = 300
            //   85f6                 | test                esi, esi
            //   7407                 | je                  9
            //   8b7608               | mov                 esi, dword ptr [esi + 8]
            //   83461c02             | add                 dword ptr [esi + 0x1c], 2
            //   5f                   | pop                 edi

        $sequence_3 = { 7407 8b7608 83461c02 5f }
            // n = 4, score = 300
            //   7407                 | je                  9
            //   8b7608               | mov                 esi, dword ptr [esi + 8]
            //   83461c02             | add                 dword ptr [esi + 0x1c], 2
            //   5f                   | pop                 edi

        $sequence_4 = { 85f6 7407 8b7608 83461c02 }
            // n = 4, score = 300
            //   85f6                 | test                esi, esi
            //   7407                 | je                  9
            //   8b7608               | mov                 esi, dword ptr [esi + 8]
            //   83461c02             | add                 dword ptr [esi + 0x1c], 2

        $sequence_5 = { 0fbec0 83c004 c3 3c2b 7503 }
            // n = 5, score = 300
            //   0fbec0               | movsx               eax, al
            //   83c004               | add                 eax, 4
            //   c3                   | ret                 
            //   3c2b                 | cmp                 al, 0x2b
            //   7503                 | jne                 5

        $sequence_6 = { 85f6 7407 8b4608 83401804 }
            // n = 4, score = 300
            //   85f6                 | test                esi, esi
            //   7407                 | je                  9
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   83401804             | add                 dword ptr [eax + 0x18], 4

        $sequence_7 = { c3 8d48d0 80f909 7707 0fbec0 83c004 c3 }
            // n = 7, score = 300
            //   c3                   | ret                 
            //   8d48d0               | lea                 ecx, [eax - 0x30]
            //   80f909               | cmp                 cl, 9
            //   7707                 | ja                  9
            //   0fbec0               | movsx               eax, al
            //   83c004               | add                 eax, 4
            //   c3                   | ret                 

        $sequence_8 = { 0fbec0 83e847 c3 8d48d0 80f909 }
            // n = 5, score = 300
            //   0fbec0               | movsx               eax, al
            //   83e847               | sub                 eax, 0x47
            //   c3                   | ret                 
            //   8d48d0               | lea                 ecx, [eax - 0x30]
            //   80f909               | cmp                 cl, 9

        $sequence_9 = { c1e610 0bf0 56 e8???????? }
            // n = 4, score = 300
            //   c1e610               | shl                 esi, 0x10
            //   0bf0                 | or                  esi, eax
            //   56                   | push                esi
            //   e8????????           |                     

    condition:
        7 of them and filesize < 352256
}
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