rule win_7ev3n_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.7ev3n."
        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.7ev3n"
        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 = { 3bc1 0f84e2810000 8dbde0dbffff 8d4f02 0f1f840000000000 668b07 }
            // n = 6, score = 100
            //   3bc1                 | cmp                 eax, ecx
            //   0f84e2810000         | je                  0x81e8
            //   8dbde0dbffff         | lea                 edi, [ebp - 0x2420]
            //   8d4f02               | lea                 ecx, [edi + 2]
            //   0f1f840000000000     | nop                 dword ptr [eax + eax]
            //   668b07               | mov                 ax, word ptr [edi]

        $sequence_1 = { 3bc1 0f8442770000 8dbd80eeffff 8d4f02 0f1f840000000000 668b07 83c702 }
            // n = 7, score = 100
            //   3bc1                 | cmp                 eax, ecx
            //   0f8442770000         | je                  0x7748
            //   8dbd80eeffff         | lea                 edi, [ebp - 0x1180]
            //   8d4f02               | lea                 ecx, [edi + 2]
            //   0f1f840000000000     | nop                 dword ptr [eax + eax]
            //   668b07               | mov                 ax, word ptr [edi]
            //   83c702               | add                 edi, 2

        $sequence_2 = { e8???????? 83ec0c 8d4508 50 8d8db0fdffff e8???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83ec0c               | sub                 esp, 0xc
            //   8d4508               | lea                 eax, [ebp + 8]
            //   50                   | push                eax
            //   8d8db0fdffff         | lea                 ecx, [ebp - 0x250]
            //   e8????????           |                     

        $sequence_3 = { d1f9 8d957ccbffff 8d7202 0f1f4000 668b02 83c202 6685c0 }
            // n = 7, score = 100
            //   d1f9                 | sar                 ecx, 1
            //   8d957ccbffff         | lea                 edx, [ebp - 0x3484]
            //   8d7202               | lea                 esi, [edx + 2]
            //   0f1f4000             | nop                 dword ptr [eax]
            //   668b02               | mov                 ax, word ptr [edx]
            //   83c202               | add                 edx, 2
            //   6685c0               | test                ax, ax

        $sequence_4 = { eb03 8d7e01 3bfb 7ed0 83c8ff eb07 8b04f5946e4400 }
            // n = 7, score = 100
            //   eb03                 | jmp                 5
            //   8d7e01               | lea                 edi, [esi + 1]
            //   3bfb                 | cmp                 edi, ebx
            //   7ed0                 | jle                 0xffffffd2
            //   83c8ff               | or                  eax, 0xffffffff
            //   eb07                 | jmp                 9
            //   8b04f5946e4400       | mov                 eax, dword ptr [esi*8 + 0x446e94]

        $sequence_5 = { 8d4db4 837dc808 0f434db4 8bc7 33d2 f775c4 03d2 }
            // n = 7, score = 100
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]
            //   837dc808             | cmp                 dword ptr [ebp - 0x38], 8
            //   0f434db4             | cmovae              ecx, dword ptr [ebp - 0x4c]
            //   8bc7                 | mov                 eax, edi
            //   33d2                 | xor                 edx, edx
            //   f775c4               | div                 dword ptr [ebp - 0x3c]
            //   03d2                 | add                 edx, edx

        $sequence_6 = { 8d9d38ffffff 8d4b02 0f1f840000000000 668b03 83c302 6685c0 }
            // n = 6, score = 100
            //   8d9d38ffffff         | lea                 ebx, [ebp - 0xc8]
            //   8d4b02               | lea                 ecx, [ebx + 2]
            //   0f1f840000000000     | nop                 dword ptr [eax + eax]
            //   668b03               | mov                 ax, word ptr [ebx]
            //   83c302               | add                 ebx, 2
            //   6685c0               | test                ax, ax

        $sequence_7 = { 75f5 2bd9 d1fb 899dfccaffff 6a00 8d458c }
            // n = 6, score = 100
            //   75f5                 | jne                 0xfffffff7
            //   2bd9                 | sub                 ebx, ecx
            //   d1fb                 | sar                 ebx, 1
            //   899dfccaffff         | mov                 dword ptr [ebp - 0x3504], ebx
            //   6a00                 | push                0
            //   8d458c               | lea                 eax, [ebp - 0x74]

        $sequence_8 = { 8d8dd0cdffff e8???????? 8bce 2bcf 3bc1 0f8432060000 8dbd00fcffff }
            // n = 7, score = 100
            //   8d8dd0cdffff         | lea                 ecx, [ebp - 0x3230]
            //   e8????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   2bcf                 | sub                 ecx, edi
            //   3bc1                 | cmp                 eax, ecx
            //   0f8432060000         | je                  0x638
            //   8dbd00fcffff         | lea                 edi, [ebp - 0x400]

        $sequence_9 = { 6a28 8d4dc8 51 50 ff15???????? 6a28 8d45c8 }
            // n = 7, score = 100
            //   6a28                 | push                0x28
            //   8d4dc8               | lea                 ecx, [ebp - 0x38]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a28                 | push                0x28
            //   8d45c8               | lea                 eax, [ebp - 0x38]

    condition:
        7 of them and filesize < 803840
}