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 (20220411 | Detects win.kurton.)
rule win_kurton_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 66ab 7669 81fe00000200 7605 }
            // n = 4, score = 100
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   7669                 | jbe                 0x6b
            //   81fe00000200         | cmp                 esi, 0x20000
            //   7605                 | jbe                 7

        $sequence_1 = { 84c0 7427 8b542418 8b44241c 8bce }
            // n = 5, score = 100
            //   84c0                 | test                al, al
            //   7427                 | je                  0x29
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   8bce                 | mov                 ecx, esi

        $sequence_2 = { 6a00 6a00 ff5228 8b06 57 53 8bce }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff5228               | call                dword ptr [edx + 0x28]
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   57                   | push                edi
            //   53                   | push                ebx
            //   8bce                 | mov                 ecx, esi

        $sequence_3 = { 7340 8bce 8bc6 c1f905 83e01f 8b0c8da05b0210 8d04c0 }
            // n = 7, score = 100
            //   7340                 | jae                 0x42
            //   8bce                 | mov                 ecx, esi
            //   8bc6                 | mov                 eax, esi
            //   c1f905               | sar                 ecx, 5
            //   83e01f               | and                 eax, 0x1f
            //   8b0c8da05b0210       | mov                 ecx, dword ptr [ecx*4 + 0x10025ba0]
            //   8d04c0               | lea                 eax, dword ptr [eax + eax*8]

        $sequence_4 = { 5e 8b4d08 8bde 80610800 c641052f c641022f }
            // n = 6, score = 100
            //   5e                   | pop                 esi
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8bde                 | mov                 ebx, esi
            //   80610800             | and                 byte ptr [ecx + 8], 0
            //   c641052f             | mov                 byte ptr [ecx + 5], 0x2f
            //   c641022f             | mov                 byte ptr [ecx + 2], 0x2f

        $sequence_5 = { e8???????? 8b15???????? 8d442414 52 6a00 50 8bce }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b15????????         |                     
            //   8d442414             | lea                 eax, dword ptr [esp + 0x14]
            //   52                   | push                edx
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8bce                 | mov                 ecx, esi

        $sequence_6 = { c745cce01b0210 e8???????? 8db5b8fdffff 803e00 7422 57 }
            // n = 6, score = 100
            //   c745cce01b0210       | mov                 dword ptr [ebp - 0x34], 0x10021be0
            //   e8????????           |                     
            //   8db5b8fdffff         | lea                 esi, dword ptr [ebp - 0x248]
            //   803e00               | cmp                 byte ptr [esi], 0
            //   7422                 | je                  0x24
            //   57                   | push                edi

        $sequence_7 = { 8bf0 8975e0 85f6 740b 56 ff15???????? 85c0 }
            // n = 7, score = 100
            //   8bf0                 | mov                 esi, eax
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   85f6                 | test                esi, esi
            //   740b                 | je                  0xd
            //   56                   | push                esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_8 = { 8b4508 ff3485a0270210 ff15???????? 5d }
            // n = 4, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   ff3485a0270210       | push                dword ptr [eax*4 + 0x100227a0]
            //   ff15????????         |                     
            //   5d                   | pop                 ebp

        $sequence_9 = { 56 8bf1 57 8b8c24a8080000 68a20f0000 50 51 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   8b8c24a8080000       | mov                 ecx, dword ptr [esp + 0x8a8]
            //   68a20f0000           | push                0xfa2
            //   50                   | push                eax
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 344064
}
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