rule win_webc2_greencat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.webc2_greencat."
        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_greencat"
        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 = { 59 57 57 56 68???????? 57 57 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   57                   | push                edi
            //   57                   | push                edi
            //   56                   | push                esi
            //   68????????           |                     
            //   57                   | push                edi
            //   57                   | push                edi

        $sequence_1 = { 83ff05 72db 83ff05 0f849f030000 6800000100 e8???????? }
            // n = 6, score = 100
            //   83ff05               | cmp                 edi, 5
            //   72db                 | jb                  0xffffffdd
            //   83ff05               | cmp                 edi, 5
            //   0f849f030000         | je                  0x3a5
            //   6800000100           | push                0x10000
            //   e8????????           |                     

        $sequence_2 = { 3bc3 59 7445 6a2f 55 885801 }
            // n = 6, score = 100
            //   3bc3                 | cmp                 eax, ebx
            //   59                   | pop                 ecx
            //   7445                 | je                  0x47
            //   6a2f                 | push                0x2f
            //   55                   | push                ebp
            //   885801               | mov                 byte ptr [eax + 1], bl

        $sequence_3 = { c20400 56 8bf1 57 8b3d???????? 8b460c 85c0 }
            // n = 7, score = 100
            //   c20400               | ret                 4
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_4 = { e8???????? be24020000 8d859cfbffff 56 53 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   be24020000           | mov                 esi, 0x224
            //   8d859cfbffff         | lea                 eax, [ebp - 0x464]
            //   56                   | push                esi
            //   53                   | push                ebx

        $sequence_5 = { c645d1f0 c645d2d2 c645d3e6 c645d4e8 c645d540 c645d64a c645d7e6 }
            // n = 7, score = 100
            //   c645d1f0             | mov                 byte ptr [ebp - 0x2f], 0xf0
            //   c645d2d2             | mov                 byte ptr [ebp - 0x2e], 0xd2
            //   c645d3e6             | mov                 byte ptr [ebp - 0x2d], 0xe6
            //   c645d4e8             | mov                 byte ptr [ebp - 0x2c], 0xe8
            //   c645d540             | mov                 byte ptr [ebp - 0x2b], 0x40
            //   c645d64a             | mov                 byte ptr [ebp - 0x2a], 0x4a
            //   c645d7e6             | mov                 byte ptr [ebp - 0x29], 0xe6

        $sequence_6 = { 59 0f84f8000000 802000 8d85f9fdffff 50 }
            // n = 5, score = 100
            //   59                   | pop                 ecx
            //   0f84f8000000         | je                  0xfe
            //   802000               | and                 byte ptr [eax], 0
            //   8d85f9fdffff         | lea                 eax, [ebp - 0x207]
            //   50                   | push                eax

        $sequence_7 = { ff750c e8???????? e9???????? 8b4508 53 }
            // n = 5, score = 100
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx

        $sequence_8 = { c6065c 50 ff15???????? 8bf8 8bc7 }
            // n = 5, score = 100
            //   c6065c               | mov                 byte ptr [esi], 0x5c
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   8bc7                 | mov                 eax, edi

        $sequence_9 = { 53 53 53 53 8d85e0fdffff 6805010000 50 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d85e0fdffff         | lea                 eax, [ebp - 0x220]
            //   6805010000           | push                0x105
            //   50                   | push                eax

    condition:
        7 of them and filesize < 57344
}