rule win_troldesh_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.troldesh"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        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 / approach 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 = { ff15???????? 59 8b07 832700 33ff 47 57 }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   832700               | and                 dword ptr [edi], 0
            //   33ff                 | xor                 edi, edi
            //   47                   | inc                 edi
            //   57                   | push                edi

        $sequence_1 = { e8???????? 8bf0 8d460a c60607 bf???????? 89450c 0fb707 }
            // n = 7, score = 600
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8d460a               | lea                 eax, [esi + 0xa]
            //   c60607               | mov                 byte ptr [esi], 7
            //   bf????????           |                     
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax
            //   0fb707               | movzx               eax, word ptr [edi]

        $sequence_2 = { 8d460a 50 8bcb e8???????? ff750c e8???????? 8b4508 }
            // n = 7, score = 600
            //   8d460a               | lea                 eax, [esi + 0xa]
            //   50                   | push                eax
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_3 = { eb02 33c0 3d00400000 7340 8b437c d1e8 83e007 }
            // n = 7, score = 600
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   3d00400000           | cmp                 eax, 0x4000
            //   7340                 | jae                 0x42
            //   8b437c               | mov                 eax, dword ptr [ebx + 0x7c]
            //   d1e8                 | shr                 eax, 1
            //   83e007               | and                 eax, 7

        $sequence_4 = { eb0b a804 7407 c685f0fdffff02 8b45f4 8b4014 f640100c }
            // n = 7, score = 600
            //   eb0b                 | jmp                 0xd
            //   a804                 | test                al, 4
            //   7407                 | je                  9
            //   c685f0fdffff02       | mov                 byte ptr [ebp - 0x210], 2
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   8b4014               | mov                 eax, dword ptr [eax + 0x14]
            //   f640100c             | test                byte ptr [eax + 0x10], 0xc

        $sequence_5 = { e9???????? 8b4514 898704010000 e9???????? 83f850 0f8f51010000 0f8440010000 }
            // n = 7, score = 600
            //   e9????????           |                     
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   898704010000         | mov                 dword ptr [edi + 0x104], eax
            //   e9????????           |                     
            //   83f850               | cmp                 eax, 0x50
            //   0f8f51010000         | jg                  0x157
            //   0f8440010000         | je                  0x146

        $sequence_6 = { ffb320010000 68???????? e8???????? 83c410 eb1f ff74241c e8???????? }
            // n = 7, score = 600
            //   ffb320010000         | push                dword ptr [ebx + 0x120]
            //   68????????           |                     
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   eb1f                 | jmp                 0x21
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   e8????????           |                     

        $sequence_7 = { e8???????? ff75e4 3945e4 7438 e8???????? 59 ff730c }
            // n = 7, score = 600
            //   e8????????           |                     
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   3945e4               | cmp                 dword ptr [ebp - 0x1c], eax
            //   7438                 | je                  0x3a
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   ff730c               | push                dword ptr [ebx + 0xc]

        $sequence_8 = { fec0 6a01 33db 8d759c 8845f3 c645fc01 e8???????? }
            // n = 7, score = 600
            //   fec0                 | inc                 al
            //   6a01                 | push                1
            //   33db                 | xor                 ebx, ebx
            //   8d759c               | lea                 esi, [ebp - 0x64]
            //   8845f3               | mov                 byte ptr [ebp - 0xd], al
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     

        $sequence_9 = { ff15???????? 59 837d0800 740a ff7508 ff15???????? 59 }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   740a                 | je                  0xc
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   59                   | pop                 ecx

    condition:
        7 of them and filesize < 3915776
}