rule win_grabbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 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_1 = { 0fb702 83f85a 770b 83f841 7206 83c020 }
            // n = 6, score = 3300
            //   0fb702               | movzx               eax, word ptr [edx]
            //   83f85a               | cmp                 eax, 0x5a
            //   770b                 | ja                  0xd
            //   83f841               | cmp                 eax, 0x41
            //   7206                 | jb                  8
            //   83c020               | add                 eax, 0x20

        $sequence_2 = { 7206 83c020 0fb7c0 83c202 }
            // n = 4, score = 3300
            //   7206                 | jb                  8
            //   83c020               | add                 eax, 0x20
            //   0fb7c0               | movzx               eax, ax
            //   83c202               | add                 edx, 2

        $sequence_3 = { c745fc0f72a7dc 8145fc11111111 56 53 51 }
            // n = 5, score = 3200
            //   c745fc0f72a7dc       | mov                 dword ptr [ebp - 4], 0xdca7720f
            //   8145fc11111111       | add                 dword ptr [ebp - 4], 0x11111111
            //   56                   | push                esi
            //   53                   | push                ebx
            //   51                   | push                ecx

        $sequence_4 = { ad 3b450c 7406 e2f8 }
            // n = 4, score = 3200
            //   ad                   | lodsd               eax, dword ptr [esi]
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]
            //   7406                 | je                  8
            //   e2f8                 | loop                0xfffffffa

        $sequence_5 = { 53 8bd8 035b3c 66813b5045 5b 7407 2d00100000 }
            // n = 7, score = 3200
            //   53                   | push                ebx
            //   8bd8                 | mov                 ebx, eax
            //   035b3c               | add                 ebx, dword ptr [ebx + 0x3c]
            //   66813b5045           | cmp                 word ptr [ebx], 0x4550
            //   5b                   | pop                 ebx
            //   7407                 | je                  9
            //   2d00100000           | sub                 eax, 0x1000

        $sequence_6 = { c745c475726541 c745c864647265 66c745cc7373 c645ce00 }
            // n = 4, score = 3200
            //   c745c475726541       | mov                 dword ptr [ebp - 0x3c], 0x41657275
            //   c745c864647265       | mov                 dword ptr [ebp - 0x38], 0x65726464
            //   66c745cc7373         | mov                 word ptr [ebp - 0x34], 0x7373
            //   c645ce00             | mov                 byte ptr [ebp - 0x32], 0

        $sequence_7 = { 68391ef172 e8???????? 50 e8???????? ffe0 }
            // n = 5, score = 3200
            //   68391ef172           | push                0x72f11e39
            //   e8????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   ffe0                 | jmp                 eax

        $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 = { 89480c e9???????? 33c0 e9???????? }
            // n = 4, score = 2300
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   e9????????           |                     
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

        $sequence_10 = { 894804 8b0d???????? 894808 8b0d???????? 89480c e9???????? }
            // n = 6, score = 2300
            //   894804               | mov                 dword ptr [eax + 4], ecx
            //   8b0d????????         |                     
            //   894808               | mov                 dword ptr [eax + 8], ecx
            //   8b0d????????         |                     
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   e9????????           |                     

        $sequence_11 = { 7428 8b0d???????? 8908 8b0d???????? 894804 8b0d???????? }
            // n = 6, score = 2300
            //   7428                 | je                  0x2a
            //   8b0d????????         |                     
            //   8908                 | mov                 dword ptr [eax], ecx
            //   8b0d????????         |                     
            //   894804               | mov                 dword ptr [eax + 4], ecx
            //   8b0d????????         |                     

        $sequence_12 = { 6a00 6840420f00 6a00 ff15???????? a3???????? 85c0 }
            // n = 6, score = 2000
            //   6a00                 | push                0
            //   6840420f00           | push                0xf4240
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   a3????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_13 = { 85f6 741e 57 56 6aff }
            // n = 5, score = 2000
            //   85f6                 | test                esi, esi
            //   741e                 | je                  0x20
            //   57                   | push                edi
            //   56                   | push                esi
            //   6aff                 | push                -1

        $sequence_14 = { 85c0 56 0f9fc3 e8???????? 83c414 }
            // n = 5, score = 2000
            //   85c0                 | test                eax, eax
            //   56                   | push                esi
            //   0f9fc3               | setg                bl
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14

        $sequence_15 = { 8bf0 85f6 741d 8d4601 50 e8???????? 8bf8 }
            // n = 7, score = 2000
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   741d                 | je                  0x1f
            //   8d4601               | lea                 eax, [esi + 1]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

    condition:
        7 of them and filesize < 1335296
}