rule win_kasperagent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.kasperagent."
        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.kasperagent"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 8947f4 52 8bcb c6043800 e8???????? }
            // n = 5, score = 200
            //   8947f4               | mov                 dword ptr [edi - 0xc], eax
            //   52                   | push                edx
            //   8bcb                 | mov                 ecx, ebx
            //   c6043800             | mov                 byte ptr [eax + edi], 0
            //   e8????????           |                     

        $sequence_1 = { 8bf9 85db 7470 8b2d???????? 6a00 6a00 6a00 }
            // n = 7, score = 200
            //   8bf9                 | mov                 edi, ecx
            //   85db                 | test                ebx, ebx
            //   7470                 | je                  0x72
            //   8b2d????????         |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_2 = { 8bf1 8b7c241c e8???????? 33c9 85c0 0f95c1 85c9 }
            // n = 7, score = 200
            //   8bf1                 | mov                 esi, ecx
            //   8b7c241c             | mov                 edi, dword ptr [esp + 0x1c]
            //   e8????????           |                     
            //   33c9                 | xor                 ecx, ecx
            //   85c0                 | test                eax, eax
            //   0f95c1               | setne               cl
            //   85c9                 | test                ecx, ecx

        $sequence_3 = { 40 5e 5d c3 833d????????00 7515 68???????? }
            // n = 7, score = 200
            //   40                   | inc                 eax
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   833d????????00       |                     
            //   7515                 | jne                 0x17
            //   68????????           |                     

        $sequence_4 = { 8b4500 3b70f8 7f17 8970f4 8b5500 }
            // n = 5, score = 200
            //   8b4500               | mov                 eax, dword ptr [ebp]
            //   3b70f8               | cmp                 esi, dword ptr [eax - 8]
            //   7f17                 | jg                  0x19
            //   8970f4               | mov                 dword ptr [eax - 0xc], esi
            //   8b5500               | mov                 edx, dword ptr [ebp]

        $sequence_5 = { e8???????? 8b542424 8b4620 6a00 52 6a27 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b542424             | mov                 edx, dword ptr [esp + 0x24]
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]
            //   6a00                 | push                0
            //   52                   | push                edx
            //   6a27                 | push                0x27
            //   50                   | push                eax

        $sequence_6 = { 663b44243c 750b b801000000 5f 5e }
            // n = 5, score = 200
            //   663b44243c           | cmp                 ax, word ptr [esp + 0x3c]
            //   750b                 | jne                 0xd
            //   b801000000           | mov                 eax, 1
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_7 = { 56 57 8bf9 85db 7470 8b2d???????? 6a00 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   85db                 | test                ebx, ebx
            //   7470                 | je                  0x72
            //   8b2d????????         |                     
            //   6a00                 | push                0

        $sequence_8 = { 8bc7 5e 83c420 c20800 b801000000 894708 8bc7 }
            // n = 7, score = 200
            //   8bc7                 | mov                 eax, edi
            //   5e                   | pop                 esi
            //   83c420               | add                 esp, 0x20
            //   c20800               | ret                 8
            //   b801000000           | mov                 eax, 1
            //   894708               | mov                 dword ptr [edi + 8], eax
            //   8bc7                 | mov                 eax, edi

        $sequence_9 = { 85c0 0f848a000000 56 8d4c2424 }
            // n = 4, score = 200
            //   85c0                 | test                eax, eax
            //   0f848a000000         | je                  0x90
            //   56                   | push                esi
            //   8d4c2424             | lea                 ecx, [esp + 0x24]

    condition:
        7 of them and filesize < 1605632
}