rule win_sappycache_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.sappycache."
        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.sappycache"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 488d8c2484020000 41b834040000 e8???????? 488d942480020000 c784248002000038040000 488bcb }
            // n = 6, score = 200
            //   488d8c2484020000     | lea                 edx, [0xe430]
            //   41b834040000         | dec                 eax
            //   e8????????           |                     
            //   488d942480020000     | mov                 eax, ecx
            //   c784248002000038040000     | and    ecx, 0x3f
            //   488bcb               | dec                 eax

        $sequence_1 = { 33ed 4c8d35266e0000 448bd5 488bf1 41bbe3000000 438d0413 }
            // n = 6, score = 200
            //   33ed                 | dec                 esp
            //   4c8d35266e0000       | lea                 eax, [0x9040]
            //   448bd5               | dec                 eax
            //   488bf1               | lea                 edx, [0x9041]
            //   41bbe3000000         | dec                 esp
            //   438d0413             | lea                 ecx, [0x6d69]

        $sequence_2 = { 4863c9 488d1556fa0000 488bc1 83e13f 48c1f806 }
            // n = 5, score = 200
            //   4863c9               | mov                 edi, edi
            //   488d1556fa0000       | test                ebp, ebp
            //   488bc1               | cmove               eax, ecx
            //   83e13f               | dec                 eax
            //   48c1f806             | mov                 ecx, edi

        $sequence_3 = { e9???????? 488d156ba20000 488d0d54a20000 e8???????? c705????????02000000 }
            // n = 5, score = 200
            //   e9????????           |                     
            //   488d156ba20000       | dec                 eax
            //   488d0d54a20000       | lea                 ebx, [0x11516]
            //   e8????????           |                     
            //   c705????????02000000     |     

        $sequence_4 = { b906000000 48898620020000 0fb7c0 66f3ab 488d3dbcf40000 }
            // n = 5, score = 200
            //   b906000000           | dec                 esp
            //   48898620020000       | xor                 ecx, edx
            //   0fb7c0               | dec                 eax
            //   66f3ab               | cmp                 ecx, eax
            //   488d3dbcf40000       | dec                 eax

        $sequence_5 = { 817c242000140000 0f8592000000 488d05b8600100 b928000000 0f1f00 }
            // n = 5, score = 200
            //   817c242000140000     | mov                 ecx, 0x68
            //   0f8592000000         | dec                 eax
            //   488d05b8600100       | mov                 ecx, esi
            //   b928000000           | dec                 ecx
            //   0f1f00               | or                  edi, 0xffffffff

        $sequence_6 = { e8???????? 418bcc 48897de0 e8???????? 85c0 0f8401010000 488d05efd80000 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   418bcc               | add                 eax, eax
            //   48897de0             | dec                 eax
            //   e8????????           |                     
            //   85c0                 | lea                 ecx, [0x5306]
            //   0f8401010000         | mov                 eax, dword ptr [ecx + eax*8]
            //   488d05efd80000       | js                  0x436

        $sequence_7 = { 498784f130800100 eb25 488bc3 498784f130800100 4885c0 7410 }
            // n = 6, score = 200
            //   498784f130800100     | lea                 edx, [ebx + 8]
            //   eb25                 | dec                 eax
            //   488bc3               | sub                 esp, 0x20
            //   498784f130800100     | dec                 eax
            //   4885c0               | mov                 ebx, ecx
            //   7410                 | dec                 eax

        $sequence_8 = { 75f7 4c8d4530 488d8d30060000 e8???????? 33c0 }
            // n = 5, score = 200
            //   75f7                 | mov                 ecx, ebx
            //   4c8d4530             | mov                 eax, dword ptr [ebp - 0x80]
            //   488d8d30060000       | dec                 eax
            //   e8????????           |                     
            //   33c0                 | mov                 ebx, esi

        $sequence_9 = { 488bd5 ff15???????? 488bf0 4885c0 752d 448d4804 41b800300000 }
            // n = 7, score = 200
            //   488bd5               | lea                 eax, [eax + 0x80]
            //   ff15????????         |                     
            //   488bf0               | je                  0xbf
            //   4885c0               | mov                 esi, dword ptr [ebp]
            //   752d                 | dec                 ecx
            //   448d4804             | mov                 ebx, dword ptr [edi + esi*8 + 0x18620]
            //   41b800300000         | dec                 eax

    condition:
        7 of them and filesize < 262144
}