rule win_sobig_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.sobig."
        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.sobig"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 50 c645fc02 e8???????? 59 c645fc01 59 6a01 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   59                   | pop                 ecx
            //   6a01                 | push                1

        $sequence_1 = { 50 8d8560fbffff 50 e8???????? 395e78 0f8494000000 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   8d8560fbffff         | lea                 eax, [ebp - 0x4a0]
            //   50                   | push                eax
            //   e8????????           |                     
            //   395e78               | cmp                 dword ptr [esi + 0x78], ebx
            //   0f8494000000         | je                  0x9a

        $sequence_2 = { 8a4801 c0e102 884e02 8a5002 }
            // n = 4, score = 100
            //   8a4801               | mov                 cl, byte ptr [eax + 1]
            //   c0e102               | shl                 cl, 2
            //   884e02               | mov                 byte ptr [esi + 2], cl
            //   8a5002               | mov                 dl, byte ptr [eax + 2]

        $sequence_3 = { ff7510 53 57 e8???????? 83c40c 85c0 7408 }
            // n = 7, score = 100
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   7408                 | je                  0xa

        $sequence_4 = { c645fc01 e8???????? ff30 8d45e8 8d4e14 50 e8???????? }
            // n = 7, score = 100
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     
            //   ff30                 | push                dword ptr [eax]
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   8d4e14               | lea                 ecx, [esi + 0x14]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_5 = { 50 ff15???????? 8d8560fbffff 50 e8???????? 83c410 8d4dc8 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d8560fbffff         | lea                 eax, [ebp - 0x4a0]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8d4dc8               | lea                 ecx, [ebp - 0x38]

        $sequence_6 = { 8d4de4 e8???????? e9???????? 8b4004 53 57 3bc6 }
            // n = 7, score = 100
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   53                   | push                ebx
            //   57                   | push                edi
            //   3bc6                 | cmp                 eax, esi

        $sequence_7 = { 59 753a 8b45ec 3bc6 7505 b8???????? 56 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   753a                 | jne                 0x3c
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   3bc6                 | cmp                 eax, esi
            //   7505                 | jne                 7
            //   b8????????           |                     
            //   56                   | push                esi

        $sequence_8 = { 5f 64890d00000000 c9 c20800 8b44240c 56 57 }
            // n = 7, score = 100
            //   5f                   | pop                 edi
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   c9                   | leave               
            //   c20800               | ret                 8
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_9 = { 6a30 68???????? e8???????? 83450840 83c40c ff45fc }
            // n = 6, score = 100
            //   6a30                 | push                0x30
            //   68????????           |                     
            //   e8????????           |                     
            //   83450840             | add                 dword ptr [ebp + 8], 0x40
            //   83c40c               | add                 esp, 0xc
            //   ff45fc               | inc                 dword ptr [ebp - 4]

    condition:
        7 of them and filesize < 262144
}