rule win_ravenstealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { ba04010000 488d8c24c00e0000 e8???????? 40b601 e9???????? e8???????? 0fbed8 }
            // n = 7, score = 100
            //   ba04010000           | mov                 eax, 4
            //   488d8c24c00e0000     | dec                 eax
            //   e8????????           |                     
            //   40b601               | lea                 ecx, [esp + 0x14a0]
            //   e9????????           |                     
            //   e8????????           |                     
            //   0fbed8               | xor                 edi, edi

        $sequence_1 = { 740a c744247c09000000 eb5a 0fbe05???????? 4103c1 4103c2 0fbe0d???????? }
            // n = 7, score = 100
            //   740a                 | btr                 eax, 8
            //   c744247c09000000     | mov                 dword ptr [esp + 0x100], eax
            //   eb5a                 | dec                 eax
            //   0fbe05????????       |                     
            //   4103c1               | lea                 ecx, [esp + 0x1028]
            //   4103c2               | cmp                 dword ptr [esp + 0x30], 0
            //   0fbe0d????????       |                     

        $sequence_2 = { 662bd0 664103d7 4863442430 664189544602 e8???????? 0fbec0 89842480000000 }
            // n = 7, score = 100
            //   662bd0               | inc                 cx
            //   664103d7             | mov                 dword ptr [esi + eax*2 + 2], edx
            //   4863442430           | and                 ax, word ptr [esp + 0x98]
            //   664189544602         | add                 ax, ax
            //   e8????????           |                     
            //   0fbec0               | inc                 ecx
            //   89842480000000       | movzx               edx, word ptr [esi + ecx*2 + 2]

        $sequence_3 = { b301 e9???????? e8???????? 0fbed8 e8???????? 0fbec8 0fafcb }
            // n = 7, score = 100
            //   b301                 | mov                 ecx, eax
            //   e9????????           |                     
            //   e8????????           |                     
            //   0fbed8               | dec                 eax
            //   e8????????           |                     
            //   0fbec8               | mov                 edx, eax
            //   0fafcb               | dec                 eax

        $sequence_4 = { 7435 0fbe05???????? 33d2 0fbe0d???????? 4103c1 f7f1 0fbe0d???????? }
            // n = 7, score = 100
            //   7435                 | dec                 ebp
            //   0fbe05????????       |                     
            //   33d2                 | test                eax, eax
            //   0fbe0d????????       |                     
            //   4103c1               | dec                 eax
            //   f7f1                 | mov                 edx, ebx
            //   0fbe0d????????       |                     

        $sequence_5 = { 899424c0000000 48c7c6ffffffff 0f1f4000 48ffc6 4238142e 75f7 488b01 }
            // n = 7, score = 100
            //   899424c0000000       | arpl                word ptr [esp + 0x40], ax
            //   48c7c6ffffffff       | inc                 sp
            //   0f1f4000             | and                 ebx, dword ptr [esp + 0xe8]
            //   48ffc6               | inc                 bp
            //   4238142e             | add                 ebx, ebx
            //   75f7                 | dec                 eax
            //   488b01               | mov                 edx, dword ptr [esp + 0x48]

        $sequence_6 = { 33c0 8885b00c0000 0f1003 0f1101 0f104b10 0f114910 f3440f7fb558070000 }
            // n = 7, score = 100
            //   33c0                 | inc                 esp
            //   8885b00c0000         | cvttps2pi           mm5, xmm1
            //   0f1003               | inc                 esp
            //   0f1101               | and                 bl, bh
            //   0f104b10             | sub                 eax, edx
            //   0f114910             | mov                 eax, eax
            //   f3440f7fb558070000     | dec    eax

        $sequence_7 = { 75e5 482bf7 48d1fe 0f57c0 0f11842480000000 4c89bc2490000000 4c89bc2498000000 }
            // n = 7, score = 100
            //   75e5                 | dec                 eax
            //   482bf7               | mov                 dword ptr [ebx], eax
            //   48d1fe               | dec                 eax
            //   0f57c0               | cmp                 dword ptr [edi + 0x18], 7
            //   0f11842480000000     | jbe                 0xac
            //   4c89bc2490000000     | dec                 eax
            //   4c89bc2498000000     | mov                 edi, dword ptr [edi]

        $sequence_8 = { eb07 4c8b95b00c0000 f20f1035???????? 41803a00 0f8531120000 89b5b00c0000 8b85b00c0000 }
            // n = 7, score = 100
            //   eb07                 | mov                 eax, dword ptr [esp + 0x40]
            //   4c8b95b00c0000       | inc                 esp
            //   f20f1035????????     |                     
            //   41803a00             | cmp                 esi, eax
            //   0f8531120000         | jge                 0xccc
            //   89b5b00c0000         | xorps               xmm0, xmm0
            //   8b85b00c0000         | dec                 eax

        $sequence_9 = { 0f1100 660f6f0d???????? f30f7f8d78040000 41b820000000 488d15b2602600 488d8d68040000 e8???????? }
            // n = 7, score = 100
            //   0f1100               | movsx               eax, al
            //   660f6f0d????????     |                     
            //   f30f7f8d78040000     | mov                 dword ptr [esp + 0x30], eax
            //   41b820000000         | movsx               eax, al
            //   488d15b2602600       | add                 ecx, edx
            //   488d8d68040000       | jne                 0xe93
            //   e8????????           |                     

    condition:
        7 of them and filesize < 8337408
}