rule win_greenshaitan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.greenshaitan."
        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.greenshaitan"
        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 = { 837b4400 c744241400000000 0f8658010000 eb02 8bd9 8b7340 8b5344 }
            // n = 7, score = 100
            //   837b4400             | cmp                 dword ptr [ebx + 0x44], 0
            //   c744241400000000     | mov                 dword ptr [esp + 0x14], 0
            //   0f8658010000         | jbe                 0x15e
            //   eb02                 | jmp                 4
            //   8bd9                 | mov                 ebx, ecx
            //   8b7340               | mov                 esi, dword ptr [ebx + 0x40]
            //   8b5344               | mov                 edx, dword ptr [ebx + 0x44]

        $sequence_1 = { e9???????? 6a24 e8???????? 8bf0 83c404 89742418 c684249800000007 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   6a24                 | push                0x24
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c404               | add                 esp, 4
            //   89742418             | mov                 dword ptr [esp + 0x18], esi
            //   c684249800000007     | mov                 byte ptr [esp + 0x98], 7

        $sequence_2 = { e8???????? 55 6a00 b9???????? c784246802000003000000 e8???????? 89ac2460020000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   55                   | push                ebp
            //   6a00                 | push                0
            //   b9????????           |                     
            //   c784246802000003000000     | mov    dword ptr [esp + 0x268], 3
            //   e8????????           |                     
            //   89ac2460020000       | mov                 dword ptr [esp + 0x260], ebp

        $sequence_3 = { b9???????? e8???????? 3bc3 751a 83fe02 721a }
            // n = 6, score = 100
            //   b9????????           |                     
            //   e8????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   751a                 | jne                 0x1c
            //   83fe02               | cmp                 esi, 2
            //   721a                 | jb                  0x1c

        $sequence_4 = { 50 8b06 51 52 50 68???????? 8d74242c }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   50                   | push                eax
            //   68????????           |                     
            //   8d74242c             | lea                 esi, [esp + 0x2c]

        $sequence_5 = { 394608 741e 8b442410 8b4d08 40 89442410 3b4124 }
            // n = 7, score = 100
            //   394608               | cmp                 dword ptr [esi + 8], eax
            //   741e                 | je                  0x20
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   40                   | inc                 eax
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   3b4124               | cmp                 eax, dword ptr [ecx + 0x24]

        $sequence_6 = { 035318 3bc2 7209 e8???????? 8b4c2420 85c9 7404 }
            // n = 7, score = 100
            //   035318               | add                 edx, dword ptr [ebx + 0x18]
            //   3bc2                 | cmp                 eax, edx
            //   7209                 | jb                  0xb
            //   e8????????           |                     
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   85c9                 | test                ecx, ecx
            //   7404                 | je                  6

        $sequence_7 = { 51 e8???????? 83c404 8d4c2410 e8???????? 55 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   e8????????           |                     
            //   55                   | push                ebp

        $sequence_8 = { 53 56 57 8bf9 8bda 57 e8???????? }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   8bda                 | mov                 ebx, edx
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_9 = { 8d0c8d60ab6e00 8901 8305????????20 8d9000080000 eb2a c6400400 }
            // n = 6, score = 100
            //   8d0c8d60ab6e00       | lea                 ecx, [ecx*4 + 0x6eab60]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8305????????20       |                     
            //   8d9000080000         | lea                 edx, [eax + 0x800]
            //   eb2a                 | jmp                 0x2c
            //   c6400400             | mov                 byte ptr [eax + 4], 0

    condition:
        7 of them and filesize < 253952
}