rule win_coronavirus_ransomware_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.coronavirus_ransomware."
        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.coronavirus_ransomware"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 52 ff15???????? a3???????? e8???????? 8b0d???????? 8b15???????? }
            // n = 6, score = 100
            //   52                   | push                edx
            //   ff15????????         |                     
            //   a3????????           |                     
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   8b15????????         |                     

        $sequence_1 = { 8b15???????? 83c408 8d4f01 51 6a08 52 ff15???????? }
            // n = 7, score = 100
            //   8b15????????         |                     
            //   83c408               | add                 esp, 8
            //   8d4f01               | lea                 ecx, [edi + 1]
            //   51                   | push                ecx
            //   6a08                 | push                8
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_2 = { 389ffd010000 0f857b040000 8b7c2418 0faf7c2428 0faf7c2424 57 }
            // n = 6, score = 100
            //   389ffd010000         | cmp                 byte ptr [edi + 0x1fd], bl
            //   0f857b040000         | jne                 0x481
            //   8b7c2418             | mov                 edi, dword ptr [esp + 0x18]
            //   0faf7c2428           | imul                edi, dword ptr [esp + 0x28]
            //   0faf7c2424           | imul                edi, dword ptr [esp + 0x24]
            //   57                   | push                edi

        $sequence_3 = { 884602 0fb691d83b4100 885603 8b06 8906 0fb64e04 }
            // n = 6, score = 100
            //   884602               | mov                 byte ptr [esi + 2], al
            //   0fb691d83b4100       | movzx               edx, byte ptr [ecx + 0x413bd8]
            //   885603               | mov                 byte ptr [esi + 3], dl
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8906                 | mov                 dword ptr [esi], eax
            //   0fb64e04             | movzx               ecx, byte ptr [esi + 4]

        $sequence_4 = { 85c0 0f84fd040000 8b44242c 3d00020000 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   0f84fd040000         | je                  0x503
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]
            //   3d00020000           | cmp                 eax, 0x200

        $sequence_5 = { 8b15???????? 6a11 52 ffd7 }
            // n = 4, score = 100
            //   8b15????????         |                     
            //   6a11                 | push                0x11
            //   52                   | push                edx
            //   ffd7                 | call                edi

        $sequence_6 = { 8d4de0 51 ff15???????? 50 ff15???????? 8945d0 c68578ffffff00 }
            // n = 7, score = 100
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   c68578ffffff00       | mov                 byte ptr [ebp - 0x88], 0

        $sequence_7 = { 7536 ff15???????? 68???????? 8bf8 e8???????? }
            // n = 5, score = 100
            //   7536                 | jne                 0x38
            //   ff15????????         |                     
            //   68????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   e8????????           |                     

        $sequence_8 = { 8d45e4 50 6a07 ff15???????? 50 ff15???????? }
            // n = 6, score = 100
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   6a07                 | push                7
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_9 = { 807d0c01 56 7510 8b75e8 8b7dcc }
            // n = 5, score = 100
            //   807d0c01             | cmp                 byte ptr [ebp + 0xc], 1
            //   56                   | push                esi
            //   7510                 | jne                 0x12
            //   8b75e8               | mov                 esi, dword ptr [ebp - 0x18]
            //   8b7dcc               | mov                 edi, dword ptr [ebp - 0x34]

    condition:
        7 of them and filesize < 235520
}