SYMBOLCOMMON_NAMEaka. SYNONYMS
win.kurton (Back to overview)

Kurton

Actor(s): Comment Crew


There is no description at this point.

References
2018MandiantMandiant
@techreport{mandiant:2018:apt1:b76cc4d, author = {Mandiant}, title = {{APT1}}, date = {2018}, institution = {Mandiant}, url = {https://github.com/securitykitten/malware_references/blob/master/Appendix%20C%20(Digital)%20-%20The%20Malware%20Arsenal.pdf}, language = {English}, urldate = {2020-01-13} } APT1
Auriga Biscuit Bouncer Combos CookieBag Dairy GetMail GlooxMail Goggles Hacksfase Helauto Kurton ManItsMe MAPIget MiniASP NewsReels SeaSalt StarsyPound Sword TabMsgSQL Tarsip WebC2-AdSpace WebC2-Ausov WebC2-Bolid WebC2-Cson WebC2-DIV WebC2-GreenCat WebC2-Head WebC2-Kt3 WebC2-Qbp WebC2-Rave WebC2-Table WebC2-UGX WebC2-Yahoo
Yara Rules
[TLP:WHITE] win_kurton_auto (20230125 | Detects win.kurton.)
rule win_kurton_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.kurton."
        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.kurton"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { e8???????? 84c0 741d 8bcd e8???????? 84c0 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   741d                 | je                  0x1f
            //   8bcd                 | mov                 ecx, ebp
            //   e8????????           |                     
            //   84c0                 | test                al, al

        $sequence_1 = { 51 6a1f 52 ffd7 8b4e04 8d442408 6a04 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   6a1f                 | push                0x1f
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   8d442408             | lea                 eax, [esp + 8]
            //   6a04                 | push                4

        $sequence_2 = { 8dae84000000 8b567c 57 55 52 8bce e8???????? }
            // n = 7, score = 100
            //   8dae84000000         | lea                 ebp, [esi + 0x84]
            //   8b567c               | mov                 edx, dword ptr [esi + 0x7c]
            //   57                   | push                edi
            //   55                   | push                ebp
            //   52                   | push                edx
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_3 = { 889c247c050000 e8???????? 8d4c2414 c784247c050000ffffffff e8???????? }
            // n = 5, score = 100
            //   889c247c050000       | mov                 byte ptr [esp + 0x57c], bl
            //   e8????????           |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   c784247c050000ffffffff     | mov    dword ptr [esp + 0x57c], 0xffffffff
            //   e8????????           |                     

        $sequence_4 = { 83e103 f3a4 8d4c240c e8???????? 8d4c2414 }
            // n = 5, score = 100
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8d4c240c             | lea                 ecx, [esp + 0xc]
            //   e8????????           |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]

        $sequence_5 = { c745ec02000080 e8???????? 6a64 8d8db8fdffff 57 51 }
            // n = 6, score = 100
            //   c745ec02000080       | mov                 dword ptr [ebp - 0x14], 0x80000002
            //   e8????????           |                     
            //   6a64                 | push                0x64
            //   8d8db8fdffff         | lea                 ecx, [ebp - 0x248]
            //   57                   | push                edi
            //   51                   | push                ecx

        $sequence_6 = { e8???????? 8b0d???????? c644247406 51 53 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   c644247406           | mov                 byte ptr [esp + 0x74], 6
            //   51                   | push                ecx
            //   53                   | push                ebx

        $sequence_7 = { f682e15d021004 740c ff01 85f6 7406 8a10 8816 }
            // n = 7, score = 100
            //   f682e15d021004       | test                byte ptr [edx + 0x10025de1], 4
            //   740c                 | je                  0xe
            //   ff01                 | inc                 dword ptr [ecx]
            //   85f6                 | test                esi, esi
            //   7406                 | je                  8
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   8816                 | mov                 byte ptr [esi], dl

        $sequence_8 = { 6a00 6a00 ff5228 8b06 }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff5228               | call                dword ptr [edx + 0x28]
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_9 = { 8365f800 8365fc00 c745f0aa730010 8965f4 896df8 64a100000000 }
            // n = 6, score = 100
            //   8365f800             | and                 dword ptr [ebp - 8], 0
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   c745f0aa730010       | mov                 dword ptr [ebp - 0x10], 0x100073aa
            //   8965f4               | mov                 dword ptr [ebp - 0xc], esp
            //   896df8               | mov                 dword ptr [ebp - 8], ebp
            //   64a100000000         | mov                 eax, dword ptr fs:[0]

    condition:
        7 of them and filesize < 344064
}
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