SYMBOLCOMMON_NAMEaka. SYNONYMS
win.tokyox (Back to overview)

TokyoX


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References
2022-01-12Lab52Jagaimo Kawaii
@online{kawaii:20220112:tokyox:809eda0, author = {Jagaimo Kawaii}, title = {{TokyoX: DLL side-loading an unknown artifact (Part 2)}}, date = {2022-01-12}, organization = {Lab52}, url = {https://lab52.io/blog/tokyox-dll-side-loading-an-unknown-artifact-part-2/}, language = {English}, urldate = {2022-01-18} } TokyoX: DLL side-loading an unknown artifact (Part 2)
TokyoX
2022-01-10Lab52ml10
@online{ml10:20220110:tokyox:ac76bdb, author = {ml10}, title = {{TokyoX: DLL side-loading an unknown artifact}}, date = {2022-01-10}, organization = {Lab52}, url = {https://lab52.io/blog/tokyox-dll-side-loading-an-unknown-artifact/}, language = {English}, urldate = {2022-01-18} } TokyoX: DLL side-loading an unknown artifact
TokyoX
Yara Rules
[TLP:WHITE] win_tokyox_auto (20230125 | Detects win.tokyox.)
rule win_tokyox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.tokyox."
        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.tokyox"
        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 = { c705????????00400000 33c0 c3 8bff 55 8bec 83ec48 }
            // n = 7, score = 200
            //   c705????????00400000     |     
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec48               | sub                 esp, 0x48

        $sequence_1 = { 6a4a 6a00 ffd6 8b1d???????? 6a10 }
            // n = 5, score = 200
            //   6a4a                 | push                0x4a
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   8b1d????????         |                     
            //   6a10                 | push                0x10

        $sequence_2 = { c745ac46003400 c745b034004700 c745b42d003400 c745b844004c00 c745bc53002d00 }
            // n = 5, score = 200
            //   c745ac46003400       | mov                 dword ptr [ebp - 0x54], 0x340046
            //   c745b034004700       | mov                 dword ptr [ebp - 0x50], 0x470034
            //   c745b42d003400       | mov                 dword ptr [ebp - 0x4c], 0x34002d
            //   c745b844004c00       | mov                 dword ptr [ebp - 0x48], 0x4c0044
            //   c745bc53002d00       | mov                 dword ptr [ebp - 0x44], 0x2d0053

        $sequence_3 = { 0345f8 50 e8???????? 8b45f4 2bfb }
            // n = 5, score = 200
            //   0345f8               | add                 eax, dword ptr [ebp - 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   2bfb                 | sub                 edi, ebx

        $sequence_4 = { 7417 8b4608 8b3d???????? 85c0 }
            // n = 4, score = 200
            //   7417                 | je                  0x19
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   8b3d????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_5 = { 8d75c8 8d4703 0f4375c8 8945d8 8d043e 50 }
            // n = 6, score = 200
            //   8d75c8               | lea                 esi, [ebp - 0x38]
            //   8d4703               | lea                 eax, [edi + 3]
            //   0f4375c8             | cmovae              esi, dword ptr [ebp - 0x38]
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   8d043e               | lea                 eax, [esi + edi]
            //   50                   | push                eax

        $sequence_6 = { c7400400000000 c70000000000 6a20 8903 e8???????? }
            // n = 5, score = 200
            //   c7400400000000       | mov                 dword ptr [eax + 4], 0
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   6a20                 | push                0x20
            //   8903                 | mov                 dword ptr [ebx], eax
            //   e8????????           |                     

        $sequence_7 = { 8d041a 83f910 8945e8 8d45d8 0f43c6 }
            // n = 5, score = 200
            //   8d041a               | lea                 eax, [edx + ebx]
            //   83f910               | cmp                 ecx, 0x10
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   0f43c6               | cmovae              eax, esi

        $sequence_8 = { ff75ec 8bce 57 e8???????? 8b5d08 51 53 }
            // n = 7, score = 200
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   8bce                 | mov                 ecx, esi
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   53                   | push                ebx

        $sequence_9 = { 8d3c11 50 8d85f0faffff 897df8 50 8d0c4e 51 }
            // n = 7, score = 200
            //   8d3c11               | lea                 edi, [ecx + edx]
            //   50                   | push                eax
            //   8d85f0faffff         | lea                 eax, [ebp - 0x510]
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   50                   | push                eax
            //   8d0c4e               | lea                 ecx, [esi + ecx*2]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 237568
}
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