rule win_taintedscribe_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.taintedscribe."
        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.taintedscribe"
        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 = { 5e b800020000 5b 5d c20c00 c6461401 }
            // n = 6, score = 500
            //   5e                   | pop                 esi
            //   b800020000           | mov                 eax, 0x200
            //   5b                   | pop                 ebx
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   c6461401             | mov                 byte ptr [esi + 0x14], 1

        $sequence_1 = { 895634 0fb755e4 894630 894638 894640 0fb745e8 c1e210 }
            // n = 7, score = 500
            //   895634               | mov                 dword ptr [esi + 0x34], edx
            //   0fb755e4             | movzx               edx, word ptr [ebp - 0x1c]
            //   894630               | mov                 dword ptr [esi + 0x30], eax
            //   894638               | mov                 dword ptr [esi + 0x38], eax
            //   894640               | mov                 dword ptr [esi + 0x40], eax
            //   0fb745e8             | movzx               eax, word ptr [ebp - 0x18]
            //   c1e210               | shl                 edx, 0x10

        $sequence_2 = { 8bf8 f3a5 8b4b28 83c414 85c9 7518 5f }
            // n = 7, score = 500
            //   8bf8                 | mov                 edi, eax
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8b4b28               | mov                 ecx, dword ptr [ebx + 0x28]
            //   83c414               | add                 esp, 0x14
            //   85c9                 | test                ecx, ecx
            //   7518                 | jne                 0x1a
            //   5f                   | pop                 edi

        $sequence_3 = { 017e54 57 53 50 e8???????? 83c418 }
            // n = 6, score = 500
            //   017e54               | add                 dword ptr [esi + 0x54], edi
            //   57                   | push                edi
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18

        $sequence_4 = { 81cf00000040 eb06 81cf00000080 81cf00000001 897da4 85c0 }
            // n = 6, score = 500
            //   81cf00000040         | or                  edi, 0x40000000
            //   eb06                 | jmp                 8
            //   81cf00000080         | or                  edi, 0x80000000
            //   81cf00000001         | or                  edi, 0x1000000
            //   897da4               | mov                 dword ptr [ebp - 0x5c], edi
            //   85c0                 | test                eax, eax

        $sequence_5 = { 8bc2 d3e0 83c40c 098658af0100 8d0419 89865caf0100 83f810 }
            // n = 7, score = 500
            //   8bc2                 | mov                 eax, edx
            //   d3e0                 | shl                 eax, cl
            //   83c40c               | add                 esp, 0xc
            //   098658af0100         | or                  dword ptr [esi + 0x1af58], eax
            //   8d0419               | lea                 eax, [ecx + ebx]
            //   89865caf0100         | mov                 dword ptr [esi + 0x1af5c], eax
            //   83f810               | cmp                 eax, 0x10

        $sequence_6 = { 668985ecfbffff e8???????? 83c40c 85db 7410 }
            // n = 5, score = 500
            //   668985ecfbffff       | mov                 word ptr [ebp - 0x414], ax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85db                 | test                ebx, ebx
            //   7410                 | je                  0x12

        $sequence_7 = { 83c418 894310 895314 8bb57cffffff 85f6 7421 8d55a4 }
            // n = 7, score = 500
            //   83c418               | add                 esp, 0x18
            //   894310               | mov                 dword ptr [ebx + 0x10], eax
            //   895314               | mov                 dword ptr [ebx + 0x14], edx
            //   8bb57cffffff         | mov                 esi, dword ptr [ebp - 0x84]
            //   85f6                 | test                esi, esi
            //   7421                 | je                  0x23
            //   8d55a4               | lea                 edx, [ebp - 0x5c]

        $sequence_8 = { 7d06 89b588fbffff 8b5350 8b4b2c 8b7b38 89958cfbffff }
            // n = 6, score = 500
            //   7d06                 | jge                 8
            //   89b588fbffff         | mov                 dword ptr [ebp - 0x478], esi
            //   8b5350               | mov                 edx, dword ptr [ebx + 0x50]
            //   8b4b2c               | mov                 ecx, dword ptr [ebx + 0x2c]
            //   8b7b38               | mov                 edi, dword ptr [ebx + 0x38]
            //   89958cfbffff         | mov                 dword ptr [ebp - 0x474], edx

        $sequence_9 = { 7407 3d50450000 7507 814da400004000 8b7da4 8b5d9c 8b4580 }
            // n = 7, score = 500
            //   7407                 | je                  9
            //   3d50450000           | cmp                 eax, 0x4550
            //   7507                 | jne                 9
            //   814da400004000       | or                  dword ptr [ebp - 0x5c], 0x400000
            //   8b7da4               | mov                 edi, dword ptr [ebp - 0x5c]
            //   8b5d9c               | mov                 ebx, dword ptr [ebp - 0x64]
            //   8b4580               | mov                 eax, dword ptr [ebp - 0x80]

    condition:
        7 of them and filesize < 524288
}