rule win_webc2_yahoo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.webc2_yahoo."
        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.webc2_yahoo"
        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 = { 8d4590 68???????? 50 e8???????? 59 }
            // n = 5, score = 100
            //   8d4590               | lea                 eax, [ebp - 0x70]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_1 = { 69c010270000 03c8 4e 8bc1 99 f7fe 8b45f4 }
            // n = 7, score = 100
            //   69c010270000         | imul                eax, eax, 0x2710
            //   03c8                 | add                 ecx, eax
            //   4e                   | dec                 esi
            //   8bc1                 | mov                 eax, ecx
            //   99                   | cdq                 
            //   f7fe                 | idiv                esi
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_2 = { 0f84d7010000 48 0f841b010000 48 0f84bd000000 48 7458 }
            // n = 7, score = 100
            //   0f84d7010000         | je                  0x1dd
            //   48                   | dec                 eax
            //   0f841b010000         | je                  0x121
            //   48                   | dec                 eax
            //   0f84bd000000         | je                  0xc3
            //   48                   | dec                 eax
            //   7458                 | je                  0x5a

        $sequence_3 = { e8???????? 8b450c 83c414 80240300 57 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   83c414               | add                 esp, 0x14
            //   80240300             | and                 byte ptr [ebx + eax], 0
            //   57                   | push                edi

        $sequence_4 = { 53 56 ff750c ff15???????? 57 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff15????????         |                     
            //   57                   | push                edi

        $sequence_5 = { 8818 8d85f4feffff 50 ff15???????? }
            // n = 4, score = 100
            //   8818                 | mov                 byte ptr [eax], bl
            //   8d85f4feffff         | lea                 eax, [ebp - 0x10c]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_6 = { 8bec b828280000 e8???????? 53 56 57 }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   b828280000           | mov                 eax, 0x2828
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_7 = { 034510 50 e8???????? 6a64 e8???????? 011e }
            // n = 6, score = 100
            //   034510               | add                 eax, dword ptr [ebp + 0x10]
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a64                 | push                0x64
            //   e8????????           |                     
            //   011e                 | add                 dword ptr [esi], ebx

        $sequence_8 = { eb29 8d459c 50 ff15???????? 50 a3???????? e8???????? }
            // n = 7, score = 100
            //   eb29                 | jmp                 0x2b
            //   8d459c               | lea                 eax, [ebp - 0x64]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   a3????????           |                     
            //   e8????????           |                     

        $sequence_9 = { 53 57 56 e8???????? ff7508 56 68???????? }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   57                   | push                edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   56                   | push                esi
            //   68????????           |                     

    condition:
        7 of them and filesize < 8060928
}