rule win_troldesh_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.troldesh."
        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.troldesh"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { e8???????? 8945f8 85c0 0f8447010000 8b4d0c 8d435c 50 }
            // n = 7, score = 600
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   85c0                 | test                eax, eax
            //   0f8447010000         | je                  0x14d
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8d435c               | lea                 eax, [ebx + 0x5c]
            //   50                   | push                eax

        $sequence_1 = { ebae 807d0401 731e 68???????? 53 6883120000 e8???????? }
            // n = 7, score = 600
            //   ebae                 | jmp                 0xffffffb0
            //   807d0401             | cmp                 byte ptr [ebp + 4], 1
            //   731e                 | jae                 0x20
            //   68????????           |                     
            //   53                   | push                ebx
            //   6883120000           | push                0x1283
            //   e8????????           |                     

        $sequence_2 = { 8bf9 85ff 7504 33c0 5f c3 85db }
            // n = 7, score = 600
            //   8bf9                 | mov                 edi, ecx
            //   85ff                 | test                edi, edi
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi
            //   c3                   | ret                 
            //   85db                 | test                ebx, ebx

        $sequence_3 = { e8???????? 8b475c 0fb788c8020000 0188c0020000 8b475c 8b770c 03c3 }
            // n = 7, score = 600
            //   e8????????           |                     
            //   8b475c               | mov                 eax, dword ptr [edi + 0x5c]
            //   0fb788c8020000       | movzx               ecx, word ptr [eax + 0x2c8]
            //   0188c0020000         | add                 dword ptr [eax + 0x2c0], ecx
            //   8b475c               | mov                 eax, dword ptr [edi + 0x5c]
            //   8b770c               | mov                 esi, dword ptr [edi + 0xc]
            //   03c3                 | add                 eax, ebx

        $sequence_4 = { ff7508 e8???????? 8d45e0 50 e8???????? 8b4508 5f }
            // n = 7, score = 600
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   5f                   | pop                 edi

        $sequence_5 = { e8???????? 85c0 7407 33c9 894dec eb02 33c9 }
            // n = 7, score = 600
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   33c9                 | xor                 ecx, ecx
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   eb02                 | jmp                 4
            //   33c9                 | xor                 ecx, ecx

        $sequence_6 = { e9???????? ff750c e8???????? 59 85c0 0f84f1000000 8b5710 }
            // n = 7, score = 600
            //   e9????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   0f84f1000000         | je                  0xf7
            //   8b5710               | mov                 edx, dword ptr [edi + 0x10]

        $sequence_7 = { ff74242c e8???????? 59 59 85c0 7533 837d1000 }
            // n = 7, score = 600
            //   ff74242c             | push                dword ptr [esp + 0x2c]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7533                 | jne                 0x35
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0

        $sequence_8 = { e8???????? 8b4e14 8d0448 3b442404 7604 b001 eb02 }
            // n = 7, score = 600
            //   e8????????           |                     
            //   8b4e14               | mov                 ecx, dword ptr [esi + 0x14]
            //   8d0448               | lea                 eax, [eax + ecx*2]
            //   3b442404             | cmp                 eax, dword ptr [esp + 4]
            //   7604                 | jbe                 6
            //   b001                 | mov                 al, 1
            //   eb02                 | jmp                 4

        $sequence_9 = { ff75fc e8???????? 59 ff7708 8d4f10 ff7704 891f }
            // n = 7, score = 600
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   ff7708               | push                dword ptr [edi + 8]
            //   8d4f10               | lea                 ecx, [edi + 0x10]
            //   ff7704               | push                dword ptr [edi + 4]
            //   891f                 | mov                 dword ptr [edi], ebx

    condition:
        7 of them and filesize < 3915776
}