rule win_ismagent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.ismagent."
        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.ismagent"
        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 = { 66a1???????? 8d9424b0020000 668907 8bf2 0f1f4000 8a02 42 }
            // n = 7, score = 200
            //   66a1????????         |                     
            //   8d9424b0020000       | lea                 edx, [esp + 0x2b0]
            //   668907               | mov                 word ptr [edi], ax
            //   8bf2                 | mov                 esi, edx
            //   0f1f4000             | nop                 dword ptr [eax]
            //   8a02                 | mov                 al, byte ptr [edx]
            //   42                   | inc                 edx

        $sequence_1 = { 75f3 68a0860100 ff74241c 50 e8???????? 8b7c241c }
            // n = 6, score = 200
            //   75f3                 | jne                 0xfffffff5
            //   68a0860100           | push                0x186a0
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b7c241c             | mov                 edi, dword ptr [esp + 0x1c]

        $sequence_2 = { 83c004 68e8030000 50 8d8424580b0000 50 e8???????? }
            // n = 6, score = 200
            //   83c004               | add                 eax, 4
            //   68e8030000           | push                0x3e8
            //   50                   | push                eax
            //   8d8424580b0000       | lea                 eax, [esp + 0xb58]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_3 = { 8d85b4f3ffff 50 8bcb 8d1432 }
            // n = 4, score = 200
            //   8d85b4f3ffff         | lea                 eax, [ebp - 0xc4c]
            //   50                   | push                eax
            //   8bcb                 | mov                 ecx, ebx
            //   8d1432               | lea                 edx, [edx + esi]

        $sequence_4 = { 6b45e430 8945e0 8d8048334200 8945e4 803800 }
            // n = 5, score = 200
            //   6b45e430             | imul                eax, dword ptr [ebp - 0x1c], 0x30
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8d8048334200         | lea                 eax, [eax + 0x423348]
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   803800               | cmp                 byte ptr [eax], 0

        $sequence_5 = { 56 e8???????? 83c410 33f6 83ff05 0f8e33010000 }
            // n = 6, score = 200
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   33f6                 | xor                 esi, esi
            //   83ff05               | cmp                 edi, 5
            //   0f8e33010000         | jle                 0x139

        $sequence_6 = { 8d040f 50 e8???????? 83c410 ff742424 }
            // n = 5, score = 200
            //   8d040f               | lea                 eax, [edi + ecx]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   ff742424             | push                dword ptr [esp + 0x24]

        $sequence_7 = { 8a45fe 8b0c8d48404200 88441129 8b0b }
            // n = 4, score = 200
            //   8a45fe               | mov                 al, byte ptr [ebp - 2]
            //   8b0c8d48404200       | mov                 ecx, dword ptr [ecx*4 + 0x424048]
            //   88441129             | mov                 byte ptr [ecx + edx + 0x29], al
            //   8b0b                 | mov                 ecx, dword ptr [ebx]

    condition:
        7 of them and filesize < 327680
}