rule win_atomsilo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.atomsilo."
        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.atomsilo"
        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 = { f348ab 488bca e8???????? 90 488d4d20 e8???????? 488bc6 }
            // n = 7, score = 100
            //   f348ab               | dec                 eax
            //   488bca               | lea                 ecx, [esp + 0x30]
            //   e8????????           |                     
            //   90                   | dec                 eax
            //   488d4d20             | mov                 edx, dword ptr [esp + 0x40]
            //   e8????????           |                     
            //   488bc6               | dec                 esp

        $sequence_1 = { 57 4156 4157 488d6c24d0 4881ec30010000 48c7442438feffffff 48899c2470010000 }
            // n = 7, score = 100
            //   57                   | mov                 ebp, edx
            //   4156                 | dec                 esp
            //   4157                 | mov                 esi, ecx
            //   488d6c24d0           | dec                 eax
            //   4881ec30010000       | lea                 eax, [0x33e12]
            //   48c7442438feffffff     | dec    eax
            //   48899c2470010000     | mov                 dword ptr [ecx], eax

        $sequence_2 = { e8???????? 90 b9c0010000 bab8010000 488b83c0010000 483983b8010000 0f42ca }
            // n = 7, score = 100
            //   e8????????           |                     
            //   90                   | dec                 eax
            //   b9c0010000           | lea                 edx, [0x22e40]
            //   bab8010000           | vsubsd              xmm4, xmm1, xmm2
            //   488b83c0010000       | les                 eax, ptr [ecx - 0x3ef3a6a5]
            //   483983b8010000       | vmovapd             xmm5, xmm1
            //   0f42ca               | dec                 esp

        $sequence_3 = { 4e8b5401f8 4d85d2 4e897439f8 4d8937 440f44e8 4b8d0c2f 493bc8 }
            // n = 7, score = 100
            //   4e8b5401f8           | mov                 ebx, eax
            //   4d85d2               | dec                 eax
            //   4e897439f8           | mov                 dword ptr [ecx + 8], ebx
            //   4d8937               | dec                 ecx
            //   440f44e8             | mov                 ecx, eax
            //   4b8d0c2f             | dec                 esp
            //   493bc8               | mov                 esi, dword ptr [esp + 0x88]

        $sequence_4 = { ff5008 0fb6e8 488b542440 4883fa10 7232 48ffc2 488b4c2428 }
            // n = 7, score = 100
            //   ff5008               | test                eax, eax
            //   0fb6e8               | nop                 
            //   488b542440           | dec                 eax
            //   4883fa10             | mov                 ecx, dword ptr [ebp + 0x30]
            //   7232                 | dec                 eax
            //   48ffc2               | cmp                 dword ptr [ebp + 0x28], ecx
            //   488b4c2428           | dec                 eax

        $sequence_5 = { 4c8d34cd00000000 488b4b08 4a833c3100 7516 b910000000 e8???????? 488b4b08 }
            // n = 7, score = 100
            //   4c8d34cd00000000     | cmp                 edx, eax
            //   488b4b08             | dec                 esp
            //   4a833c3100           | mov                 ecx, ecx
            //   7516                 | dec                 esp
            //   b910000000           | cmovb               eax, edx
            //   e8????????           |                     
            //   488b4b08             | dec                 ebp

        $sequence_6 = { f30f7f442468 4885ff 7410 488b07 4885c0 7408 488b00 }
            // n = 7, score = 100
            //   f30f7f442468         | mov                 ecx, eax
            //   4885ff               | dec                 esp
            //   7410                 | mov                 eax, dword ptr [ebp + 0x88]
            //   488b07               | dec                 eax
            //   4885c0               | mov                 edx, dword ptr [ebp + 0x28]
            //   7408                 | dec                 eax
            //   488b00               | mov                 ecx, dword ptr [ebp + 0x78]

        $sequence_7 = { 4055 4883ec20 488bea 8b8590010000 83e004 85c0 7410 }
            // n = 7, score = 100
            //   4055                 | dec                 eax
            //   4883ec20             | mov                 eax, esi
            //   488bea               | add                 al, 0xd
            //   8b8590010000         | xor                 eax, 0x4d
            //   83e004               | mov                 byte ptr [esp + 0x61], al
            //   85c0                 | mov                 eax, dword ptr [esp + 0x50]
            //   7410                 | add                 al, 0xe

        $sequence_8 = { 896f48 48c74758ffffffff 48896f60 48896f68 488bd3 488bcf e8???????? }
            // n = 7, score = 100
            //   896f48               | dec                 eax
            //   48c74758ffffffff     | sub                 eax, 1
            //   48896f60             | jne                 0x1298
            //   48896f68             | dec                 eax
            //   488bd3               | mov                 ecx, dword ptr [esp + 0x58]
            //   488bcf               | dec                 eax
            //   e8????????           |                     

        $sequence_9 = { 4584ff 0f44c3 4c8d9c2490000000 498b5b20 498b6b30 498b7338 }
            // n = 6, score = 100
            //   4584ff               | dec                 eax
            //   0f44c3               | lea                 ecx, [esp + 0x28]
            //   4c8d9c2490000000     | nop                 
            //   498b5b20             | dec                 eax
            //   498b6b30             | lea                 edx, [0x66e13]
            //   498b7338             | dec                 eax

    condition:
        7 of them and filesize < 1785856
}