rule win_grabbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { ffe0 c3 55 8bec 51 53 52 }
            // n = 7, score = 3600
            //   ffe0                 | dec                 ecx
            //   c3                   | mov                 edi, ebp
            //   55                   | dec                 ebp
            //   8bec                 | test                ebp, ebp
            //   51                   | je                  0xba2
            //   53                   | dec                 eax
            //   52                   | mov                 eax, dword ptr [edi]

        $sequence_1 = { e8???????? ffe0 c3 68a0f7bf08 e8???????? }
            // n = 5, score = 3600
            //   e8????????           |                     
            //   ffe0                 | dec                 eax
            //   c3                   | test                esi, esi
            //   68a0f7bf08           | je                  0xc07
            //   e8????????           |                     

        $sequence_2 = { 03ca 3bc1 773f 81ec80000000 8bdc 53 }
            // n = 6, score = 3600
            //   03ca                 | push                0
            //   3bc1                 | mov                 bl, al
            //   773f                 | add                 esp, 0xc
            //   81ec80000000         | mov                 al, bl
            //   8bdc                 | pop                 edi
            //   53                   | mov                 bl, al

        $sequence_3 = { 8919 648b152c000000 8b3c9a 8b30 }
            // n = 4, score = 3600
            //   8919                 | jb                  0xf2
            //   648b152c000000       | push                eax
            //   8b3c9a               | lea                 eax, [ebp - 0x5c]
            //   8b30                 | jb                  2

        $sequence_4 = { 6683c020 0fb70a 6683f95a 770a 6683f941 }
            // n = 5, score = 3600
            //   6683c020             | dec                 eax
            //   0fb70a               | mov                 dword ptr [ebp + 0xf], eax
            //   6683f95a             | dec                 eax
            //   770a                 | mov                 eax, dword ptr [ecx + 0x20]
            //   6683f941             | dec                 eax

        $sequence_5 = { 5a 5b 59 c9 c20800 eb25 8b0424 }
            // n = 7, score = 3600
            //   5a                   | pop                 eax
            //   5b                   | dec                 eax
            //   59                   | mov                 byte ptr [ebp + eax - 0x40], bl
            //   c9                   | jne                 0x888
            //   c20800               | cmp                 edi, ebx
            //   eb25                 | je                  0x8da
            //   8b0424               | mov                 ecx, edi

        $sequence_6 = { 741a 3b8884000000 7312 85f6 }
            // n = 4, score = 3600
            //   741a                 | push                ebx
            //   3b8884000000         | push                0x2719
            //   7312                 | mov                 eax, esi
            //   85f6                 | push                ebx

        $sequence_7 = { 8b8c18b0000000 85c9 7460 83bc188400000005 7656 8bbc18b4000000 }
            // n = 6, score = 3600
            //   8b8c18b0000000       | dec                 eax
            //   85c9                 | mov                 ebp, esp
            //   7460                 | dec                 eax
            //   83bc188400000005     | sub                 esp, 0x80
            //   7656                 | mov                 eax, 0x63
            //   8bbc18b4000000       | dec                 esp

        $sequence_8 = { e8???????? ff750c ff7508 ffd0 5a 5b }
            // n = 6, score = 3600
            //   e8????????           |                     
            //   ff750c               | jbe                 0x1d4c
            //   ff7508               | jne                 0x1d0e
            //   ffd0                 | mov                 dword ptr [ebp - 8], 1
            //   5a                   | mov                 edx, dword ptr [ebp - 0x14]
            //   5b                   | mov                 dword ptr [ebp - 0x10], edx

        $sequence_9 = { 53 e8???????? 59 81c480000000 50 }
            // n = 5, score = 3600
            //   53                   | and                 dword ptr [eax + 0x18], 0
            //   e8????????           |                     
            //   59                   | dec                 eax
            //   81c480000000         | and                 dword ptr [eax + 0x20], 0
            //   50                   | xor                 bl, bl

    condition:
        7 of them and filesize < 1335296
}