rule win_coronavirus_ransomware_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 33d2 6689959c9fffff 68fe1f0000 52 8d859e9fffff 50 }
            // n = 6, score = 100
            //   33d2                 | xor                 edx, edx
            //   6689959c9fffff       | mov                 word ptr [ebp - 0x6064], dx
            //   68fe1f0000           | push                0x1ffe
            //   52                   | push                edx
            //   8d859e9fffff         | lea                 eax, [ebp - 0x6062]
            //   50                   | push                eax

        $sequence_1 = { 68fe1f0000 50 8d8d9edfffff 51 e8???????? 83c424 }
            // n = 6, score = 100
            //   68fe1f0000           | push                0x1ffe
            //   50                   | push                eax
            //   8d8d9edfffff         | lea                 ecx, [ebp - 0x2062]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c424               | add                 esp, 0x24

        $sequence_2 = { 8a4601 84c0 7423 0fb6d0 0fb68280fa4000 0fb615???????? }
            // n = 6, score = 100
            //   8a4601               | mov                 al, byte ptr [esi + 1]
            //   84c0                 | test                al, al
            //   7423                 | je                  0x25
            //   0fb6d0               | movzx               edx, al
            //   0fb68280fa4000       | movzx               eax, byte ptr [edx + 0x40fa80]
            //   0fb615????????       |                     

        $sequence_3 = { 68???????? 50 ff15???????? 83c41c 6a00 6a00 6a00 }
            // n = 7, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c41c               | add                 esp, 0x1c
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_4 = { 83ff0f 7330 eb13 6a44 }
            // n = 4, score = 100
            //   83ff0f               | cmp                 edi, 0xf
            //   7330                 | jae                 0x32
            //   eb13                 | jmp                 0x15
            //   6a44                 | push                0x44

        $sequence_5 = { 0f841e030000 66833d????????00 bb???????? 0f840b030000 8bc3 8d5002 8d9b00000000 }
            // n = 7, score = 100
            //   0f841e030000         | je                  0x324
            //   66833d????????00     |                     
            //   bb????????           |                     
            //   0f840b030000         | je                  0x311
            //   8bc3                 | mov                 eax, ebx
            //   8d5002               | lea                 edx, [eax + 2]
            //   8d9b00000000         | lea                 ebx, [ebx]

        $sequence_6 = { 85c0 7406 8b55d0 880417 8b45c8 50 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   8b55d0               | mov                 edx, dword ptr [ebp - 0x30]
            //   880417               | mov                 byte ptr [edi + edx], al
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   50                   | push                eax

        $sequence_7 = { 52 ff15???????? a1???????? 8b1d???????? 50 8d8df8deffff }
            // n = 6, score = 100
            //   52                   | push                edx
            //   ff15????????         |                     
            //   a1????????           |                     
            //   8b1d????????         |                     
            //   50                   | push                eax
            //   8d8df8deffff         | lea                 ecx, [ebp - 0x2108]

        $sequence_8 = { 8d4900 66833f00 0f8407010000 57 ff15???????? 83f803 7413 }
            // n = 7, score = 100
            //   8d4900               | lea                 ecx, [ecx]
            //   66833f00             | cmp                 word ptr [edi], 0
            //   0f8407010000         | je                  0x10d
            //   57                   | push                edi
            //   ff15????????         |                     
            //   83f803               | cmp                 eax, 3
            //   7413                 | je                  0x15

        $sequence_9 = { 68???????? 68???????? 6a15 b8???????? e8???????? 50 }
            // n = 6, score = 100
            //   68????????           |                     
            //   68????????           |                     
            //   6a15                 | push                0x15
            //   b8????????           |                     
            //   e8????????           |                     
            //   50                   | push                eax

    condition:
        7 of them and filesize < 235520
}