rule win_remcom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { c705????????30000000 c705????????02000000 c705????????01000000 8935???????? 8935???????? 8935???????? 8935???????? }
            // n = 7, score = 100
            //   c705????????30000000     |     
            //   c705????????02000000     |     
            //   c705????????01000000     |     
            //   8935????????         |                     
            //   8935????????         |                     
            //   8935????????         |                     
            //   8935????????         |                     

        $sequence_1 = { 8b0485e0fc4000 83e61f c1e606 8d443004 8020fd 8b45f8 8b55fc }
            // n = 7, score = 100
            //   8b0485e0fc4000       | mov                 eax, dword ptr [eax*4 + 0x40fce0]
            //   83e61f               | and                 esi, 0x1f
            //   c1e606               | shl                 esi, 6
            //   8d443004             | lea                 eax, dword ptr [eax + esi + 4]
            //   8020fd               | and                 byte ptr [eax], 0xfd
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]

        $sequence_2 = { 0010 8340008a 46 0323 d188470383ee }
            // n = 5, score = 100
            //   0010                 | add                 byte ptr [eax], dl
            //   8340008a             | add                 dword ptr [eax], -0x76
            //   46                   | inc                 esi
            //   0323                 | add                 esp, dword ptr [ebx]
            //   d188470383ee         | ror                 dword ptr [eax - 0x117cfcb9], 1

        $sequence_3 = { 8955f8 c745fc01000000 ff15???????? 8bf0 85f6 74a5 }
            // n = 6, score = 100
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   74a5                 | je                  0xffffffa7

        $sequence_4 = { 57 8d3c85ccf54000 833f00 bb00100000 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   8d3c85ccf54000       | lea                 edi, dword ptr [eax*4 + 0x40f5cc]
            //   833f00               | cmp                 dword ptr [edi], 0
            //   bb00100000           | mov                 ebx, 0x1000

        $sequence_5 = { 8bec 83ec14 8d45fc 50 c745ecc8b14000 c745f010134000 }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   83ec14               | sub                 esp, 0x14
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   c745ecc8b14000       | mov                 dword ptr [ebp - 0x14], 0x40b1c8
            //   c745f010134000       | mov                 dword ptr [ebp - 0x10], 0x401310

        $sequence_6 = { 7416 8bc8 83e11f 8bf0 c1fe05 c1e106 030cb5e0fc4000 }
            // n = 7, score = 100
            //   7416                 | je                  0x18
            //   8bc8                 | mov                 ecx, eax
            //   83e11f               | and                 ecx, 0x1f
            //   8bf0                 | mov                 esi, eax
            //   c1fe05               | sar                 esi, 5
            //   c1e106               | shl                 ecx, 6
            //   030cb5e0fc4000       | add                 ecx, dword ptr [esi*4 + 0x40fce0]

        $sequence_7 = { 750c a1???????? 50 ff15???????? 8b4dfc 33cd e8???????? }
            // n = 7, score = 100
            //   750c                 | jne                 0xe
            //   a1????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     

        $sequence_8 = { 51 6a08 8d95e0edffff 52 56 8985e0edffff ff15???????? }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   6a08                 | push                8
            //   8d95e0edffff         | lea                 edx, dword ptr [ebp - 0x1220]
            //   52                   | push                edx
            //   56                   | push                esi
            //   8985e0edffff         | mov                 dword ptr [ebp - 0x1220], eax
            //   ff15????????         |                     

        $sequence_9 = { 8d3c85ccf54000 833f00 bb00100000 7520 53 e8???????? 59 }
            // n = 7, score = 100
            //   8d3c85ccf54000       | lea                 edi, dword ptr [eax*4 + 0x40f5cc]
            //   833f00               | cmp                 dword ptr [edi], 0
            //   bb00100000           | mov                 ebx, 0x1000
            //   7520                 | jne                 0x22
            //   53                   | push                ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx

    condition:
        7 of them and filesize < 155648
}