SYMBOLCOMMON_NAMEaka. SYNONYMS
win.yorekey (Back to overview)

YoreKey

Actor(s): Kimsuky


There is no description at this point.

References
2021-11-18ProofpointDarien Huss, Selena Larson
@techreport{huss:20211118:triple:dd07fa8, author = {Darien Huss and Selena Larson}, title = {{Triple Threat: North Korea-Aligned TA406 Steals, Scams and Spies}}, date = {2021-11-18}, institution = {Proofpoint}, url = {https://www.proofpoint.com/sites/default/files/threat-reports/pfpt-us-tr-threat-insight-paper-triple-threat-N-Korea-aligned-TA406-steals-scams-spies.pdf}, language = {English}, urldate = {2021-12-15} } Triple Threat: North Korea-Aligned TA406 Steals, Scams and Spies
YoreKey
2021-11-18ProofpointDarien Huss, Selena Larson
@online{huss:20211118:triple:62c1c14, author = {Darien Huss and Selena Larson}, title = {{Triple Threat: North Korea-Aligned TA406 Scams, Spies, and Steals}}, date = {2021-11-18}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/blog/threat-insight/triple-threat-north-korea-aligned-ta406-scams-spies-and-steals}, language = {English}, urldate = {2021-12-15} } Triple Threat: North Korea-Aligned TA406 Scams, Spies, and Steals
YoreKey
Yara Rules
[TLP:WHITE] win_yorekey_auto (20220411 | Detects win.yorekey.)
rule win_yorekey_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.yorekey."
        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.yorekey"
        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 = { 750a 85c0 7506 ff15???????? }
            // n = 4, score = 200
            //   750a                 | jne                 0xc
            //   85c0                 | test                eax, eax
            //   7506                 | jne                 8
            //   ff15????????         |                     

        $sequence_1 = { 448d430f 488d15220d0100 488bcd 48c744242000000000 ff15???????? }
            // n = 5, score = 100
            //   448d430f             | dec                 eax
            //   488d15220d0100       | lea                 edx, dword ptr [edx + 2]
            //   488bcd               | inc                 dx
            //   48c744242000000000     | mov    dword ptr [edx + eax + 0x1bf2e], ecx
            //   ff15????????         |                     

        $sequence_2 = { 4c8bc7 4883caff 498bcd e8???????? 33c9 488bfd }
            // n = 6, score = 100
            //   4c8bc7               | test                cx, cx
            //   4883caff             | jne                 0xfffffff7
            //   498bcd               | nop                 dword ptr [eax]
            //   e8????????           |                     
            //   33c9                 | movzx               ecx, word ptr [ebp + eax - 0x38]
            //   488bfd               | dec                 eax

        $sequence_3 = { 7509 488d053f190100 eb04 4883c010 }
            // n = 4, score = 100
            //   7509                 | lea                 eax, dword ptr [eax + 2]
            //   488d053f190100       | inc                 esp
            //   eb04                 | lea                 eax, dword ptr [ebx + 0xf]
            //   4883c010             | dec                 eax

        $sequence_4 = { a3???????? 85c0 750c b801000000 5e 8be5 }
            // n = 6, score = 100
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   750c                 | jne                 0xe
            //   b801000000           | mov                 eax, 1
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_5 = { c744242000000000 48c741180f000000 48c7411000000000 c60100 c744242001000000 33f6 33c9 }
            // n = 7, score = 100
            //   c744242000000000     | lea                 edx, dword ptr [0x10d22]
            //   48c741180f000000     | dec                 eax
            //   48c7411000000000     | mov                 ecx, ebp
            //   c60100               | dec                 eax
            //   c744242001000000     | mov                 dword ptr [esp + 0x20], 0
            //   33f6                 | dec                 esp
            //   33c9                 | mov                 eax, edi

        $sequence_6 = { 85c0 7403 50 ffd7 8b8560ffffff 85c0 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8b8560ffffff         | mov                 eax, dword ptr [ebp - 0xa0]
            //   85c0                 | test                eax, eax

        $sequence_7 = { 7415 83f81b 7530 a1???????? }
            // n = 4, score = 100
            //   7415                 | je                  0x17
            //   83f81b               | cmp                 eax, 0x1b
            //   7530                 | jne                 0x32
            //   a1????????           |                     

        $sequence_8 = { ff15???????? 8bf0 85f6 740b 6a00 57 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   740b                 | je                  0xd
            //   6a00                 | push                0
            //   57                   | push                edi

        $sequence_9 = { ba0c000000 4889442450 e8???????? 488d442440 4883cbff 48ffc3 66833c5800 }
            // n = 7, score = 100
            //   ba0c000000           | mov                 edx, 0xc
            //   4889442450           | dec                 eax
            //   e8????????           |                     
            //   488d442440           | mov                 dword ptr [esp + 0x50], eax
            //   4883cbff             | dec                 eax
            //   48ffc3               | lea                 eax, dword ptr [esp + 0x40]
            //   66833c5800           | dec                 eax

        $sequence_10 = { c705????????7f3c4000 8935???????? a3???????? ff15???????? a3???????? 83f8ff 0f84c1000000 }
            // n = 7, score = 100
            //   c705????????7f3c4000     |     
            //   8935????????         |                     
            //   a3????????           |                     
            //   ff15????????         |                     
            //   a3????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   0f84c1000000         | je                  0xc7

        $sequence_11 = { 8b3d???????? 8b8570ffffff 85c0 7403 }
            // n = 4, score = 100
            //   8b3d????????         |                     
            //   8b8570ffffff         | mov                 eax, dword ptr [ebp - 0x90]
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5

        $sequence_12 = { 33db 4883f9ff 7524 488d15a5990100 488d0dae810100 }
            // n = 5, score = 100
            //   33db                 | or                  ebx, 0xffffffff
            //   4883f9ff             | dec                 eax
            //   7524                 | inc                 ebx
            //   488d15a5990100       | cmp                 word ptr [eax + ebx*2], 0
            //   488d0dae810100       | xor                 ebx, ebx

        $sequence_13 = { 8d7002 8d9b00000000 668b08 83c002 6685c9 75f5 8b4d08 }
            // n = 7, score = 100
            //   8d7002               | lea                 esi, dword ptr [eax + 2]
            //   8d9b00000000         | lea                 ebx, dword ptr [ebx]
            //   668b08               | mov                 cx, word ptr [eax]
            //   83c002               | add                 eax, 2
            //   6685c9               | test                cx, cx
            //   75f5                 | jne                 0xfffffff7
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_14 = { 488d5202 6642898c022ebf0100 6685c9 75e9 0f1f00 0fb74c05c8 488d4002 }
            // n = 7, score = 100
            //   488d5202             | dec                 eax
            //   6642898c022ebf0100     | cmp    ecx, -1
            //   6685c9               | jne                 0x26
            //   75e9                 | dec                 eax
            //   0f1f00               | lea                 edx, dword ptr [0x199a5]
            //   0fb74c05c8           | dec                 eax
            //   488d4002             | lea                 ecx, dword ptr [0x181ae]

    condition:
        7 of them and filesize < 274432
}
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