rule win_thumbthief_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.thumbthief."
        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.thumbthief"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { e9???????? 8d8e143d0000 e8???????? 3bd0 0f84f3000000 8d8e203f0000 e8???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8d8e143d0000         | lea                 ecx, [esi + 0x3d14]
            //   e8????????           |                     
            //   3bd0                 | cmp                 edx, eax
            //   0f84f3000000         | je                  0xf9
            //   8d8e203f0000         | lea                 ecx, [esi + 0x3f20]
            //   e8????????           |                     

        $sequence_1 = { e8???????? c645fc02 8d8d18ffffff e8???????? c645fc03 8d4d9c e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   8d8d18ffffff         | lea                 ecx, [ebp - 0xe8]
            //   e8????????           |                     
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   8d4d9c               | lea                 ecx, [ebp - 0x64]
            //   e8????????           |                     

        $sequence_2 = { ff75f8 e8???????? 83c40c 85c0 0f856e010000 8bce e8???????? }
            // n = 7, score = 100
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   0f856e010000         | jne                 0x174
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_3 = { e9???????? 8b4dec 81c1c4210000 e9???????? 8b4dec 81c108230000 e9???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   81c1c4210000         | add                 ecx, 0x21c4
            //   e9????????           |                     
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   81c108230000         | add                 ecx, 0x2308
            //   e9????????           |                     

        $sequence_4 = { f30f6f4120 f30f7f4720 f30f6f4130 f30f7f4730 f30f7e4140 660fd64740 8b4148 }
            // n = 7, score = 100
            //   f30f6f4120           | movdqu              xmm0, xmmword ptr [ecx + 0x20]
            //   f30f7f4720           | movdqu              xmmword ptr [edi + 0x20], xmm0
            //   f30f6f4130           | movdqu              xmm0, xmmword ptr [ecx + 0x30]
            //   f30f7f4730           | movdqu              xmmword ptr [edi + 0x30], xmm0
            //   f30f7e4140           | movq                xmm0, qword ptr [ecx + 0x40]
            //   660fd64740           | movq                qword ptr [edi + 0x40], xmm0
            //   8b4148               | mov                 eax, dword ptr [ecx + 0x48]

        $sequence_5 = { f644c21c20 8d34c2 8b44b908 8d3c80 7511 8bce e8???????? }
            // n = 7, score = 100
            //   f644c21c20           | test                byte ptr [edx + eax*8 + 0x1c], 0x20
            //   8d34c2               | lea                 esi, [edx + eax*8]
            //   8b44b908             | mov                 eax, dword ptr [ecx + edi*4 + 8]
            //   8d3c80               | lea                 edi, [eax + eax*4]
            //   7511                 | jne                 0x13
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_6 = { ff15???????? 8bd8 807e0800 741a 837e1802 b960880000 8d4104 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   807e0800             | cmp                 byte ptr [esi + 8], 0
            //   741a                 | je                  0x1c
            //   837e1802             | cmp                 dword ptr [esi + 0x18], 2
            //   b960880000           | mov                 ecx, 0x8860
            //   8d4104               | lea                 eax, [ecx + 4]

        $sequence_7 = { eba7 68de070000 eba0 68df070000 eb99 68db070000 eb92 }
            // n = 7, score = 100
            //   eba7                 | jmp                 0xffffffa9
            //   68de070000           | push                0x7de
            //   eba0                 | jmp                 0xffffffa2
            //   68df070000           | push                0x7df
            //   eb99                 | jmp                 0xffffff9b
            //   68db070000           | push                0x7db
            //   eb92                 | jmp                 0xffffff94

        $sequence_8 = { c785b0feffff0a000000 8b8574feffff 83c0f6 8985acfeffff 8985b8feffff c785b4feffff05000000 c785bcfeffff28000000 }
            // n = 7, score = 100
            //   c785b0feffff0a000000     | mov    dword ptr [ebp - 0x150], 0xa
            //   8b8574feffff         | mov                 eax, dword ptr [ebp - 0x18c]
            //   83c0f6               | add                 eax, -0xa
            //   8985acfeffff         | mov                 dword ptr [ebp - 0x154], eax
            //   8985b8feffff         | mov                 dword ptr [ebp - 0x148], eax
            //   c785b4feffff05000000     | mov    dword ptr [ebp - 0x14c], 5
            //   c785bcfeffff28000000     | mov    dword ptr [ebp - 0x144], 0x28

        $sequence_9 = { eb23 ff7514 ff7510 8bcf e8???????? eb14 885deb }
            // n = 7, score = 100
            //   eb23                 | jmp                 0x25
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   eb14                 | jmp                 0x16
            //   885deb               | mov                 byte ptr [ebp - 0x15], bl

    condition:
        7 of them and filesize < 4235264
}