rule win_grabbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.grabbot."
        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.grabbot"
        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 = { 83f85a 770b 83f841 7206 }
            // n = 4, score = 3300
            //   83f85a               | cmp                 eax, 0x5a
            //   770b                 | ja                  0xd
            //   83f841               | cmp                 eax, 0x41
            //   7206                 | jb                  8

        $sequence_1 = { 83f841 7206 83c020 0fb7c0 }
            // n = 4, score = 3300
            //   83f841               | cmp                 eax, 0x41
            //   7206                 | jb                  8
            //   83c020               | add                 eax, 0x20
            //   0fb7c0               | movzx               eax, ax

        $sequence_2 = { 83f85a 770d 83f841 7208 83c020 }
            // n = 5, score = 3300
            //   83f85a               | cmp                 eax, 0x5a
            //   770d                 | ja                  0xf
            //   83f841               | cmp                 eax, 0x41
            //   7208                 | jb                  0xa
            //   83c020               | add                 eax, 0x20

        $sequence_3 = { c20800 55 8bec 83c4f0 8945fc 895df8 }
            // n = 6, score = 3200
            //   c20800               | ret                 8
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83c4f0               | add                 esp, -0x10
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   895df8               | mov                 dword ptr [ebp - 8], ebx

        $sequence_4 = { 3bcd 7515 85c9 7434 0fbe0a }
            // n = 5, score = 3200
            //   3bcd                 | cmp                 ecx, ebp
            //   7515                 | jne                 0x17
            //   85c9                 | test                ecx, ecx
            //   7434                 | je                  0x36
            //   0fbe0a               | movsx               ecx, byte ptr [edx]

        $sequence_5 = { e8???????? 83c410 85c0 7404 85ff 75d5 }
            // n = 6, score = 3200
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7404                 | je                  6
            //   85ff                 | test                edi, edi
            //   75d5                 | jne                 0xffffffd7

        $sequence_6 = { 3b5dfc 0f853dffffff 5a 59 5b 83c428 c9 }
            // n = 7, score = 3200
            //   3b5dfc               | cmp                 ebx, dword ptr [ebp - 4]
            //   0f853dffffff         | jne                 0xffffff43
            //   5a                   | pop                 edx
            //   59                   | pop                 ecx
            //   5b                   | pop                 ebx
            //   83c428               | add                 esp, 0x28
            //   c9                   | leave               

        $sequence_7 = { 8b4d08 2bfe 51 83c6f8 }
            // n = 4, score = 3200
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   2bfe                 | sub                 edi, esi
            //   51                   | push                ecx
            //   83c6f8               | add                 esi, -8

        $sequence_8 = { 56 ffd0 33c9 66894c37fe }
            // n = 4, score = 2600
            //   56                   | push                esi
            //   ffd0                 | call                eax
            //   33c9                 | xor                 ecx, ecx
            //   66894c37fe           | mov                 word ptr [edi + esi - 2], cx

        $sequence_9 = { 894808 8b0d???????? 89480c e9???????? 33c0 }
            // n = 5, score = 2300
            //   894808               | mov                 dword ptr [eax + 8], ecx
            //   8b0d????????         |                     
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   e9????????           |                     
            //   33c0                 | xor                 eax, eax

        $sequence_10 = { 7428 8b0d???????? 8908 8b0d???????? 894804 8b0d???????? 894808 }
            // n = 7, score = 2300
            //   7428                 | je                  0x2a
            //   8b0d????????         |                     
            //   8908                 | mov                 dword ptr [eax], ecx
            //   8b0d????????         |                     
            //   894804               | mov                 dword ptr [eax + 4], ecx
            //   8b0d????????         |                     
            //   894808               | mov                 dword ptr [eax + 8], ecx

        $sequence_11 = { 6840420f00 6a00 ff15???????? a3???????? 85c0 }
            // n = 5, score = 2000
            //   6840420f00           | push                0xf4240
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   a3????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_12 = { 57 8d7c000c 57 e8???????? 8bf0 }
            // n = 5, score = 2000
            //   57                   | push                edi
            //   8d7c000c             | lea                 edi, [eax + eax + 0xc]
            //   57                   | push                edi
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_13 = { 0f9fc3 e8???????? 83c414 5e 8ac3 }
            // n = 5, score = 2000
            //   0f9fc3               | setg                bl
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   5e                   | pop                 esi
            //   8ac3                 | mov                 al, bl

        $sequence_14 = { 85c0 741b 8d440002 50 e8???????? }
            // n = 5, score = 2000
            //   85c0                 | test                eax, eax
            //   741b                 | je                  0x1d
            //   8d440002             | lea                 eax, [eax + eax + 2]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_15 = { e8???????? 85c0 56 0f9fc3 }
            // n = 4, score = 2000
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   56                   | push                esi
            //   0f9fc3               | setg                bl

    condition:
        7 of them and filesize < 1335296
}