rule win_fickle_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.fickle."
        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.fickle"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { c7460400000000 31c0 83c404 5e 5f 5b c3 }
            // n = 7, score = 100
            //   c7460400000000       | mov                 dword ptr [esi + 4], 0
            //   31c0                 | xor                 eax, eax
            //   83c404               | add                 esp, 4
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx
            //   c3                   | ret                 

        $sequence_1 = { bb00000000 83d3ff c1e704 01c7 c1e304 035e04 39d1 }
            // n = 7, score = 100
            //   bb00000000           | mov                 ebx, 0
            //   83d3ff               | adc                 ebx, -1
            //   c1e704               | shl                 edi, 4
            //   01c7                 | add                 edi, eax
            //   c1e304               | shl                 ebx, 4
            //   035e04               | add                 ebx, dword ptr [esi + 4]
            //   39d1                 | cmp                 ecx, edx

        $sequence_2 = { c686ac00000001 8dbe080f0000 c686080f000000 897c2408 c686090f000000 8954242c f30f6f02 }
            // n = 7, score = 100
            //   c686ac00000001       | mov                 byte ptr [esi + 0xac], 1
            //   8dbe080f0000         | lea                 edi, [esi + 0xf08]
            //   c686080f000000       | mov                 byte ptr [esi + 0xf08], 0
            //   897c2408             | mov                 dword ptr [esp + 8], edi
            //   c686090f000000       | mov                 byte ptr [esi + 0xf09], 0
            //   8954242c             | mov                 dword ptr [esp + 0x2c], edx
            //   f30f6f02             | movdqu              xmm0, xmmword ptr [edx]

        $sequence_3 = { ba00000000 75b0 0fb74008 357e2c0000 f20f10442430 f20f11442420 6689442428 }
            // n = 7, score = 100
            //   ba00000000           | mov                 edx, 0
            //   75b0                 | jne                 0xffffffb2
            //   0fb74008             | movzx               eax, word ptr [eax + 8]
            //   357e2c0000           | xor                 eax, 0x2c7e
            //   f20f10442430         | movsd               xmm0, qword ptr [esp + 0x30]
            //   f20f11442420         | movsd               qword ptr [esp + 0x20], xmm0
            //   6689442428           | mov                 word ptr [esp + 0x28], ax

        $sequence_4 = { 8d8ef0120000 e8???????? e9???????? 8b07 897e30 8b4f04 c786b834000001000000 }
            // n = 7, score = 100
            //   8d8ef0120000         | lea                 ecx, [esi + 0x12f0]
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   897e30               | mov                 dword ptr [esi + 0x30], edi
            //   8b4f04               | mov                 ecx, dword ptr [edi + 4]
            //   c786b834000001000000     | mov    dword ptr [esi + 0x34b8], 1

        $sequence_5 = { e8???????? c7460c00000080 84db 750e f0ff0e 7509 89f1 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c7460c00000080       | mov                 dword ptr [esi + 0xc], 0x80000000
            //   84db                 | test                bl, bl
            //   750e                 | jne                 0x10
            //   f0ff0e               | lock dec            dword ptr [esi]
            //   7509                 | jne                 0xb
            //   89f1                 | mov                 ecx, esi

        $sequence_6 = { c70600000000 c6460401 e9???????? 8b4910 85c9 0f8409030000 8b14854c9a8901 }
            // n = 7, score = 100
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   c6460401             | mov                 byte ptr [esi + 4], 1
            //   e9????????           |                     
            //   8b4910               | mov                 ecx, dword ptr [ecx + 0x10]
            //   85c9                 | test                ecx, ecx
            //   0f8409030000         | je                  0x30f
            //   8b14854c9a8901       | mov                 edx, dword ptr [eax*4 + 0x1899a4c]

        $sequence_7 = { a1???????? 85c0 7403 56 ffd0 84db 0f848c000000 }
            // n = 7, score = 100
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   56                   | push                esi
            //   ffd0                 | call                eax
            //   84db                 | test                bl, bl
            //   0f848c000000         | je                  0x92

        $sequence_8 = { e9???????? 81c370ffffff be90000000 56 53 ff742420 }
            // n = 6, score = 100
            //   e9????????           |                     
            //   81c370ffffff         | add                 ebx, 0xffffff70
            //   be90000000           | mov                 esi, 0x90
            //   56                   | push                esi
            //   53                   | push                ebx
            //   ff742420             | push                dword ptr [esp + 0x20]

        $sequence_9 = { c144243007 037c2440 014c2418 035c2430 036c2444 8b4c2404 31e9 }
            // n = 7, score = 100
            //   c144243007           | rol                 dword ptr [esp + 0x30], 7
            //   037c2440             | add                 edi, dword ptr [esp + 0x40]
            //   014c2418             | add                 dword ptr [esp + 0x18], ecx
            //   035c2430             | add                 ebx, dword ptr [esp + 0x30]
            //   036c2444             | add                 ebp, dword ptr [esp + 0x44]
            //   8b4c2404             | mov                 ecx, dword ptr [esp + 4]
            //   31e9                 | xor                 ecx, ebp

    condition:
        7 of them and filesize < 1646592
}