rule win_laplas_shell_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.laplas_shell."
        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.laplas_shell"
        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 = { ffd3 e9???????? 83ec0c 8d8dd8fbffff e8???????? 83c40c }
            // n = 6, score = 100
            //   ffd3                 | call                ebx
            //   e9????????           |                     
            //   83ec0c               | sub                 esp, 0xc
            //   8d8dd8fbffff         | lea                 ecx, [ebp - 0x428]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_1 = { 8d0c1a 81f900000080 8d9100000080 8d8100000080 }
            // n = 4, score = 100
            //   8d0c1a               | lea                 ecx, [edx + ebx]
            //   81f900000080         | cmp                 ecx, 0x80000000
            //   8d9100000080         | lea                 edx, [ecx - 0x80000000]
            //   8d8100000080         | lea                 eax, [ecx - 0x80000000]

        $sequence_2 = { 8bf8 8d8d50e6ffff 8d85b0e6ffff 50 e8???????? }
            // n = 5, score = 100
            //   8bf8                 | mov                 edi, eax
            //   8d8d50e6ffff         | lea                 ecx, [ebp - 0x19b0]
            //   8d85b0e6ffff         | lea                 eax, [ebp - 0x1950]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_3 = { c705????????090400c0 c705????????01000000 c705????????01000000 6a04 58 6bc000 c780ac50400002000000 }
            // n = 7, score = 100
            //   c705????????090400c0     |     
            //   c705????????01000000     |     
            //   c705????????01000000     |     
            //   6a04                 | push                4
            //   58                   | pop                 eax
            //   6bc000               | imul                eax, eax, 0
            //   c780ac50400002000000     | mov    dword ptr [eax + 0x4050ac], 2

        $sequence_4 = { 2bfb ba???????? 57 eb0e 68???????? 8d043b ba???????? }
            // n = 7, score = 100
            //   2bfb                 | sub                 edi, ebx
            //   ba????????           |                     
            //   57                   | push                edi
            //   eb0e                 | jmp                 0x10
            //   68????????           |                     
            //   8d043b               | lea                 eax, [ebx + edi]
            //   ba????????           |                     

        $sequence_5 = { 8bda 33d2 8bc7 f775fc 3bc1 7204 3bde }
            // n = 7, score = 100
            //   8bda                 | mov                 ebx, edx
            //   33d2                 | xor                 edx, edx
            //   8bc7                 | mov                 eax, edi
            //   f775fc               | div                 dword ptr [ebp - 4]
            //   3bc1                 | cmp                 eax, ecx
            //   7204                 | jb                  6
            //   3bde                 | cmp                 ebx, esi

        $sequence_6 = { ffb5a4e6ffff ffd3 6800040000 8d85f0fbffff }
            // n = 4, score = 100
            //   ffb5a4e6ffff         | push                dword ptr [ebp - 0x195c]
            //   ffd3                 | call                ebx
            //   6800040000           | push                0x400
            //   8d85f0fbffff         | lea                 eax, [ebp - 0x410]

        $sequence_7 = { c7471407000000 668907 8945fc 33f6 c745ec01000000 b907000000 0f1f440000 }
            // n = 7, score = 100
            //   c7471407000000       | mov                 dword ptr [edi + 0x14], 7
            //   668907               | mov                 word ptr [edi], ax
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   33f6                 | xor                 esi, esi
            //   c745ec01000000       | mov                 dword ptr [ebp - 0x14], 1
            //   b907000000           | mov                 ecx, 7
            //   0f1f440000           | nop                 dword ptr [eax + eax]

        $sequence_8 = { c78554e6ffff64000000 e8???????? 8bf8 8d8d50e6ffff 8d85b0e6ffff }
            // n = 5, score = 100
            //   c78554e6ffff64000000     | mov    dword ptr [ebp - 0x19ac], 0x64
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   8d8d50e6ffff         | lea                 ecx, [ebp - 0x19b0]
            //   8d85b0e6ffff         | lea                 eax, [ebp - 0x1950]

        $sequence_9 = { 74e6 5d c3 837d08ff 0f8472040000 e9???????? 55 }
            // n = 7, score = 100
            //   74e6                 | je                  0xffffffe8
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   837d08ff             | cmp                 dword ptr [ebp + 8], -1
            //   0f8472040000         | je                  0x478
            //   e9????????           |                     
            //   55                   | push                ebp

    condition:
        7 of them and filesize < 59392
}