rule win_ravenstealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ravenstealer."
        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.ravenstealer"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 90 c644245f00 488d5590 488d4c245f e8???????? 4c8bf0 f2440f100d???????? }
            // n = 7, score = 100
            //   90                   | lea                 edx, [ebp - 0x59]
            //   c644245f00           | nop                 
            //   488d5590             | inc                 eax
            //   488d4c245f           | test                bh, 1
            //   e8????????           |                     
            //   4c8bf0               | je                  0x1da4
            //   f2440f100d????????     |     

        $sequence_1 = { 660fefc0 0f1101 660f6f05???????? 660f7f85301b0000 48c7c7ffffffff 4c8bc7 6690 }
            // n = 7, score = 100
            //   660fefc0             | movdqa              xmmword ptr [ebp + 0x910], xmm0
            //   0f1101               | dec                 esp
            //   660f6f05????????     |                     
            //   660f7f85301b0000     | mov                 eax, edi
            //   48c7c7ffffffff       | dec                 eax
            //   4c8bc7               | mov                 eax, dword ptr [esp + 0x30]
            //   6690                 | dec                 ecx

        $sequence_2 = { 90 488d8d80160000 660fefc0 0f1101 660f6f05???????? 660f7f8590160000 4c8bc7 }
            // n = 7, score = 100
            //   90                   | add                 ecx, edx
            //   488d8d80160000       | add                 ecx, edx
            //   660fefc0             | je                  0xc00
            //   0f1101               | lea                 edx, [ecx + ecx*4]
            //   660f6f05????????     |                     
            //   660f7f8590160000     | add                 edx, edx
            //   4c8bc7               | inc                 ecx

        $sequence_3 = { 48837df00f 480f4745d8 0fbe18 ebb7 48837df00f 480f4745d8 488b4dc0 }
            // n = 7, score = 100
            //   48837df00f           | movzx               edx, byte ptr [ecx + esi + 1]
            //   480f4745d8           | sub                 dl, al
            //   0fbe18               | dec                 eax
            //   ebb7                 | arpl                word ptr [esp + 0x58], ax
            //   48837df00f           | dec                 eax
            //   480f4745d8           | arpl                word ptr [esp + 0x58], cx
            //   488b4dc0             | inc                 ecx

        $sequence_4 = { 8944244c 8b442420 83c059 660f6ed0 f30fe6d2 0fbe05???????? 660f6ec0 }
            // n = 7, score = 100
            //   8944244c             | movzx               eax, bh
            //   8b442420             | inc                 ecx
            //   83c059               | and                 al, dl
            //   660f6ed0             | add                 al, al
            //   f30fe6d2             | movzx               edx, byte ptr [esp + 0x44]
            //   0fbe05????????       |                     
            //   660f6ec0             | sub                 dl, al

        $sequence_5 = { 7443 e8???????? 0fbec8 0fbe15???????? 0fafd1 8d1c92 03db }
            // n = 7, score = 100
            //   7443                 | je                  0x958
            //   e8????????           |                     
            //   0fbec8               | inc                 ecx
            //   0fbe15????????       |                     
            //   0fafd1               | mov                 ecx, 9
            //   8d1c92               | jmp                 0x9b4
            //   03db                 | test                ecx, ecx

        $sequence_6 = { 488d8a60000000 e9???????? 488d8a88000000 e9???????? 488d8a60000000 e9???????? 488d8a28030000 }
            // n = 7, score = 100
            //   488d8a60000000       | lea                 eax, [esp + 0x190]
            //   e9????????           |                     
            //   488d8a88000000       | dec                 ecx
            //   e9????????           |                     
            //   488d8a60000000       | mov                 eax, 0xffffffff
            //   e9????????           |                     
            //   488d8a28030000       | dec                 ecx

        $sequence_7 = { 4d8bc7 488bc8 4983fe07 764b 488b1f 488bd3 e8???????? }
            // n = 7, score = 100
            //   4d8bc7               | inc                 ecx
            //   488bc8               | movaps              xmm6, xmmword ptr [ebx - 0x10]
            //   4983fe07             | inc                 ecx
            //   764b                 | movaps              xmm7, xmmword ptr [ebx - 0x20]
            //   488b1f               | inc                 ebp
            //   488bd3               | movaps              xmm0, xmmword ptr [ebx - 0x30]
            //   e8????????           |                     

        $sequence_8 = { 488bc8 e8???????? 488bc8 488d85c8020000 660fefc0 0f1100 660f6f0d???????? }
            // n = 7, score = 100
            //   488bc8               | mov                 ebp, dword ptr [esp + 0xa0]
            //   e8????????           |                     
            //   488bc8               | dec                 eax
            //   488d85c8020000       | mov                 eax, esi
            //   660fefc0             | dec                 eax
            //   0f1100               | mov                 ecx, eax
            //   660f6f0d????????     |                     

        $sequence_9 = { f20f59442440 f20f2cc0 898424f8000000 48638c24a0000000 0fb78424b0000000 6623842498000000 6603c0 }
            // n = 7, score = 100
            //   f20f59442440         | addsd               xmm0, xmm0
            //   f20f2cc0             | subsd               xmm1, xmm0
            //   898424f8000000       | inc                 ecx
            //   48638c24a0000000     | mulps               xmm1, xmm6
            //   0fb78424b0000000     | movsd               qword ptr [esp + 0x28], xmm1
            //   6623842498000000     | movsx               ebx, al
            //   6603c0               | addsd               xmm0, xmm0

    condition:
        7 of them and filesize < 8337408
}