rule win_remcom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.remcom."
        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.remcom"
        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 = { 6a01 6a00 6a01 8d4de0 51 ffd3 8d45f4 }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   51                   | push                ecx
            //   ffd3                 | call                ebx
            //   8d45f4               | lea                 eax, [ebp - 0xc]

        $sequence_1 = { e8???????? 83c414 85c0 7515 5f b802000000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   85c0                 | test                eax, eax
            //   7515                 | jne                 0x17
            //   5f                   | pop                 edi
            //   b802000000           | mov                 eax, 2

        $sequence_2 = { 897de0 ff15???????? 33db 50 53 68ffff1f00 }
            // n = 6, score = 100
            //   897de0               | mov                 dword ptr [ebp - 0x20], edi
            //   ff15????????         |                     
            //   33db                 | xor                 ebx, ebx
            //   50                   | push                eax
            //   53                   | push                ebx
            //   68ffff1f00           | push                0x1fffff

        $sequence_3 = { 6aff 6a00 6a00 68ff000000 6a04 6a02 }
            // n = 6, score = 100
            //   6aff                 | push                -1
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68ff000000           | push                0xff
            //   6a04                 | push                4
            //   6a02                 | push                2

        $sequence_4 = { ff15???????? 8b85f4feffff 5b 5f 5e 8b4dfc }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8b85f4feffff         | mov                 eax, dword ptr [ebp - 0x10c]
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_5 = { ff15???????? 8bf0 85f6 74a5 6a00 56 ff15???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   74a5                 | je                  0xffffffa7
            //   6a00                 | push                0
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_6 = { eb12 8b45e0 8a806ceb4000 08443b1d }
            // n = 4, score = 100
            //   eb12                 | jmp                 0x14
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8a806ceb4000         | mov                 al, byte ptr [eax + 0x40eb6c]
            //   08443b1d             | or                  byte ptr [ebx + edi + 0x1d], al

        $sequence_7 = { 33c0 50 8985e0edffff 8985e4edffff 8d85dcedffff 50 6814120000 }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   50                   | push                eax
            //   8985e0edffff         | mov                 dword ptr [ebp - 0x1220], eax
            //   8985e4edffff         | mov                 dword ptr [ebp - 0x121c], eax
            //   8d85dcedffff         | lea                 eax, [ebp - 0x1224]
            //   50                   | push                eax
            //   6814120000           | push                0x1214

        $sequence_8 = { 57 33f6 bf???????? 833cf52ce5400001 751e 8d04f528e54000 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   33f6                 | xor                 esi, esi
            //   bf????????           |                     
            //   833cf52ce5400001     | cmp                 dword ptr [esi*8 + 0x40e52c], 1
            //   751e                 | jne                 0x20
            //   8d04f528e54000       | lea                 eax, [esi*8 + 0x40e528]

        $sequence_9 = { 50 6814120000 8d8de8edffff 51 56 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   6814120000           | push                0x1214
            //   8d8de8edffff         | lea                 ecx, [ebp - 0x1218]
            //   51                   | push                ecx
            //   56                   | push                esi

    condition:
        7 of them and filesize < 155648
}