rule win_snatch_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.snatch_loader."
        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.snatch_loader"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 85f6 744b 33c0 66894606 a1???????? 85c0 }
            // n = 6, score = 600
            //   85f6                 | test                esi, esi
            //   744b                 | je                  0x4d
            //   33c0                 | xor                 eax, eax
            //   66894606             | mov                 word ptr [esi + 6], ax
            //   a1????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_1 = { e8???????? a3???????? 85c0 7505 8b45fc eb05 }
            // n = 6, score = 600
            //   e8????????           |                     
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   eb05                 | jmp                 7

        $sequence_2 = { 53 53 8d4dfc 51 53 53 56 }
            // n = 7, score = 600
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d4dfc               | lea                 ecx, [ebp - 4]
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_3 = { 33d2 85c9 5e 0f45c2 8be5 }
            // n = 5, score = 600
            //   33d2                 | xor                 edx, edx
            //   85c9                 | test                ecx, ecx
            //   5e                   | pop                 esi
            //   0f45c2               | cmovne              eax, edx
            //   8be5                 | mov                 esp, ebp

        $sequence_4 = { 8bd8 a1???????? 85c0 751d 33c9 }
            // n = 5, score = 600
            //   8bd8                 | mov                 ebx, eax
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   751d                 | jne                 0x1f
            //   33c9                 | xor                 ecx, ecx

        $sequence_5 = { 33db bfe71edec0 895dfc e8???????? 8bf0 }
            // n = 5, score = 600
            //   33db                 | xor                 ebx, ebx
            //   bfe71edec0           | mov                 edi, 0xc0de1ee7
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_6 = { 8b7dfc eb04 ffd0 8bf8 a1???????? 85c0 }
            // n = 6, score = 600
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]
            //   eb04                 | jmp                 6
            //   ffd0                 | call                eax
            //   8bf8                 | mov                 edi, eax
            //   a1????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_7 = { 83c002 668945f6 a1???????? 85c0 7522 33c9 }
            // n = 6, score = 600
            //   83c002               | add                 eax, 2
            //   668945f6             | mov                 word ptr [ebp - 0xa], ax
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   7522                 | jne                 0x24
            //   33c9                 | xor                 ecx, ecx

        $sequence_8 = { 57 51 52 ff750c e8???????? }
            // n = 5, score = 500
            //   57                   | push                edi
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     

        $sequence_9 = { 59 5b 5a c9 c20c00 55 8bec }
            // n = 7, score = 500
            //   59                   | pop                 ecx
            //   5b                   | pop                 ebx
            //   5a                   | pop                 edx
            //   c9                   | leave               
            //   c20c00               | ret                 0xc
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_10 = { 03c6 ab 5b 5e eb03 }
            // n = 5, score = 500
            //   03c6                 | add                 eax, esi
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi
            //   eb03                 | jmp                 5

        $sequence_11 = { 76d8 33c0 48 5a 59 5f }
            // n = 6, score = 500
            //   76d8                 | jbe                 0xffffffda
            //   33c0                 | xor                 eax, eax
            //   48                   | dec                 eax
            //   5a                   | pop                 edx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi

        $sequence_12 = { 57 56 8b36 56 8b33 33c0 }
            // n = 6, score = 500
            //   57                   | push                edi
            //   56                   | push                esi
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   56                   | push                esi
            //   8b33                 | mov                 esi, dword ptr [ebx]
            //   33c0                 | xor                 eax, eax

        $sequence_13 = { 0bc0 7440 3b45fc 773b 8b750c 8b7d10 037508 }
            // n = 7, score = 500
            //   0bc0                 | or                  eax, eax
            //   7440                 | je                  0x42
            //   3b45fc               | cmp                 eax, dword ptr [ebp - 4]
            //   773b                 | ja                  0x3d
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   037508               | add                 esi, dword ptr [ebp + 8]

        $sequence_14 = { 7454 394508 734f ff7510 }
            // n = 4, score = 500
            //   7454                 | je                  0x56
            //   394508               | cmp                 dword ptr [ebp + 8], eax
            //   734f                 | jae                 0x51
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_15 = { 33d2 33c9 8a0431 0ac0 }
            // n = 4, score = 500
            //   33d2                 | xor                 edx, edx
            //   33c9                 | xor                 ecx, ecx
            //   8a0431               | mov                 al, byte ptr [ecx + esi]
            //   0ac0                 | or                  al, al

    condition:
        7 of them and filesize < 262144
}