rule win_revstealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.revstealer."
        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.revstealer"
        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 = { e8???????? 33f6 85c0 7507 32c0 e9???????? 48397330 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   33f6                 | mov                 edx, 0x6590020d
            //   85c0                 | dec                 eax
            //   7507                 | mov                 ecx, eax
            //   32c0                 | dec                 eax
            //   e9????????           |                     
            //   48397330             | lea                 ecx, [0x25348]

        $sequence_1 = { 488d4002 663928 75f5 41b94a000000 4c8d05b8360200 488d4c2420 e8???????? }
            // n = 7, score = 100
            //   488d4002             | movups              xmm0, xmmword ptr [ecx + 0x60]
            //   663928               | movups              xmmword ptr [edx + 0x50], xmm1
            //   75f5                 | movups              xmm1, xmmword ptr [ecx + eax]
            //   41b94a000000         | movups              xmmword ptr [edx + 0x60], xmm0
            //   4c8d05b8360200       | movups              xmm0, xmmword ptr [ecx + 0x70]
            //   488d4c2420           | movups              xmm1, xmmword ptr [ecx + 0x50]
            //   e8????????           |                     

        $sequence_2 = { 8b05???????? 3bc7 75f6 448bc6 488d9570080000 488d0d28d90300 e8???????? }
            // n = 7, score = 100
            //   8b05????????         |                     
            //   3bc7                 | lea                 edx, [0x34348]
            //   75f6                 | dec                 eax
            //   448bc6               | mov                 dword ptr [esp + 0x38], edi
            //   488d9570080000       | inc                 ebp
            //   488d0d28d90300       | xor                 ecx, ecx
            //   e8????????           |                     

        $sequence_3 = { 488bc8 ff15???????? 488d45c8 89742428 4c8d4d90 4889442420 }
            // n = 6, score = 100
            //   488bc8               | cmp                 eax, ebx
            //   ff15????????         |                     
            //   488d45c8             | jne                 0x8c2
            //   89742428             | dec                 eax
            //   4c8d4d90             | lea                 ecx, [0x44b4f]
            //   4889442420           | mov                 edx, 0x7c42d31d

        $sequence_4 = { 483bd9 7ceb e9???????? 83ff10 0f8ea0000000 33d2 488d4d70 }
            // n = 7, score = 100
            //   483bd9               | jne                 0xd50
            //   7ceb                 | dec                 esp
            //   e9????????           |                     
            //   83ff10               | mov                 dword ptr [edi + 8], esi
            //   0f8ea0000000         | dec                 esp
            //   33d2                 | lea                 esi, [0x24768]
            //   488d4d70             | cmp                 eax, ebx

        $sequence_5 = { 740d 4881fb00080000 0f87d6fcffff 498bcd e8???????? 488d95b0010000 498bcc }
            // n = 7, score = 100
            //   740d                 | mov                 eax, edi
            //   4881fb00080000       | mov                 esi, 1
            //   0f87d6fcffff         | inc                 esp
            //   498bcd               | movzx               eax, word ptr [edi]
            //   e8????????           |                     
            //   488d95b0010000       | dec                 eax
            //   498bcc               | add                 edi, 2

        $sequence_6 = { 4c3b4308 7290 488b3b 4885ff 7427 488b05???????? 4885c0 }
            // n = 7, score = 100
            //   4c3b4308             | dec                 eax
            //   7290                 | lea                 edx, [esp + 0x40]
            //   488b3b               | dec                 eax
            //   4885ff               | lea                 ecx, [esp + 0x48]
            //   7427                 | cmp                 eax, edi
            //   488b05????????       |                     
            //   4885c0               | jne                 0x1abe

        $sequence_7 = { 33d2 488bc8 ff15???????? 488b5de8 4885db 7427 488b05???????? }
            // n = 7, score = 100
            //   33d2                 | mov                 dword ptr [eax + 0x608], ebx
            //   488bc8               | dec                 esp
            //   ff15????????         |                     
            //   488b5de8             | mov                 eax, dword ptr [edi + 0x28]
            //   4885db               | dec                 esp
            //   7427                 | mov                 ecx, ebx
            //   488b05????????       |                     

        $sequence_8 = { 4c8b4580 33d2 488bc8 ff15???????? 488b5c2468 4885db 7427 }
            // n = 7, score = 100
            //   4c8b4580             | inc                 bx
            //   33d2                 | cmova               edx, dword ptr [ebx + edx]
            //   488bc8               | add                 cx, 0x20
            //   ff15????????         |                     
            //   488b5c2468           | sub                 ax, 0x41
            //   4885db               | inc                 ecx
            //   7427                 | movzx               edx, word ptr [eax]

        $sequence_9 = { 740c 4103f5 4903c5 4883f830 7ced 8b05???????? 33ff }
            // n = 7, score = 100
            //   740c                 | inc                 esp
            //   4103f5               | movzx               edx, byte ptr [esp + eax + 0x30]
            //   4903c5               | inc                 esp
            //   4883f830             | mov                 bl, bl
            //   7ced                 | inc                 eax
            //   8b05????????         |                     
            //   33ff                 | test                bh, 3

    condition:
        7 of them and filesize < 737280
}