rule win_lambload_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.lambload."
        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.lambload"
        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 = { 03f7 8d4601 50 ff75f4 }
            // n = 4, score = 100
            //   03f7                 | add                 esi, edi
            //   8d4601               | lea                 eax, [esi + 1]
            //   50                   | push                eax
            //   ff75f4               | push                dword ptr [ebp - 0xc]

        $sequence_1 = { e8???????? 83c40c 85c0 7511 ffb5ecf5ffff e8???????? 59 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13
            //   ffb5ecf5ffff         | push                dword ptr [ebp - 0xa14]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_2 = { 72d0 7705 3b550c 76c9 8b450c }
            // n = 5, score = 100
            //   72d0                 | jb                  0xffffffd2
            //   7705                 | ja                  7
            //   3b550c               | cmp                 edx, dword ptr [ebp + 0xc]
            //   76c9                 | jbe                 0xffffffcb
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_3 = { c604063d 59 8945f4 8bf7 75e6 }
            // n = 5, score = 100
            //   c604063d             | mov                 byte ptr [esi + eax], 0x3d
            //   59                   | pop                 ecx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8bf7                 | mov                 esi, edi
            //   75e6                 | jne                 0xffffffe8

        $sequence_4 = { 8bf8 8bf1 a5 53 66a5 e8???????? 85c0 }
            // n = 7, score = 100
            //   8bf8                 | mov                 edi, eax
            //   8bf1                 | mov                 esi, ecx
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   53                   | push                ebx
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_5 = { c785f8ebffff10000000 8d8d34ecffff 8b51cc 8b31 8bc2 }
            // n = 5, score = 100
            //   c785f8ebffff10000000     | mov    dword ptr [ebp - 0x1408], 0x10
            //   8d8d34ecffff         | lea                 ecx, [ebp - 0x13cc]
            //   8b51cc               | mov                 edx, dword ptr [ecx - 0x34]
            //   8b31                 | mov                 esi, dword ptr [ecx]
            //   8bc2                 | mov                 eax, edx

        $sequence_6 = { c1e006 03048d00490710 eb02 8bc2 f6402480 7418 e8???????? }
            // n = 7, score = 100
            //   c1e006               | shl                 eax, 6
            //   03048d00490710       | add                 eax, dword ptr [ecx*4 + 0x10074900]
            //   eb02                 | jmp                 4
            //   8bc2                 | mov                 eax, edx
            //   f6402480             | test                byte ptr [eax + 0x24], 0x80
            //   7418                 | je                  0x1a
            //   e8????????           |                     

        $sequence_7 = { 8945fc 8d4601 50 ff75f4 }
            // n = 4, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8d4601               | lea                 eax, [esi + 1]
            //   50                   | push                eax
            //   ff75f4               | push                dword ptr [ebp - 0xc]

        $sequence_8 = { 0f859b010000 8b3d???????? 8d85e8fbffff 50 8d85ecfbffff 50 56 }
            // n = 7, score = 100
            //   0f859b010000         | jne                 0x1a1
            //   8b3d????????         |                     
            //   8d85e8fbffff         | lea                 eax, [ebp - 0x418]
            //   50                   | push                eax
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_9 = { bf???????? 8b6c242c 8d45ff 83f81d 0f87ba030000 33c9 8a88287e0310 }
            // n = 7, score = 100
            //   bf????????           |                     
            //   8b6c242c             | mov                 ebp, dword ptr [esp + 0x2c]
            //   8d45ff               | lea                 eax, [ebp - 1]
            //   83f81d               | cmp                 eax, 0x1d
            //   0f87ba030000         | ja                  0x3c0
            //   33c9                 | xor                 ecx, ecx
            //   8a88287e0310         | mov                 cl, byte ptr [eax + 0x10037e28]

    condition:
        7 of them and filesize < 1039360
}