rule win_poscardstealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.poscardstealer."
        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.poscardstealer"
        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 = { 50 8d4db8 e8???????? 6a01 6aff b303 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   8d4db8               | lea                 ecx, [ebp - 0x48]
            //   e8????????           |                     
            //   6a01                 | push                1
            //   6aff                 | push                -1
            //   b303                 | mov                 bl, 3

        $sequence_1 = { 83e61f 8d3c85e0794200 8b07 c1e606 8a4c3004 f6c101 7514 }
            // n = 7, score = 200
            //   83e61f               | and                 esi, 0x1f
            //   8d3c85e0794200       | lea                 edi, [eax*4 + 0x4279e0]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   c1e606               | shl                 esi, 6
            //   8a4c3004             | mov                 cl, byte ptr [eax + esi + 4]
            //   f6c101               | test                cl, 1
            //   7514                 | jne                 0x16

        $sequence_2 = { e8???????? 83c404 c745e80f000000 c745e400000000 c645d400 c745fcffffffff 3975cc }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c745e80f000000       | mov                 dword ptr [ebp - 0x18], 0xf
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0
            //   c645d400             | mov                 byte ptr [ebp - 0x2c], 0
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   3975cc               | cmp                 dword ptr [ebp - 0x34], esi

        $sequence_3 = { e8???????? 83c40c 8bfb eb5f 7360 8bc6 2bc7 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8bfb                 | mov                 edi, ebx
            //   eb5f                 | jmp                 0x61
            //   7360                 | jae                 0x62
            //   8bc6                 | mov                 eax, esi
            //   2bc7                 | sub                 eax, edi

        $sequence_4 = { 51 8d4dec 8bf8 c7450c30e74100 e8???????? 68???????? 8d55ec }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   8bf8                 | mov                 edi, eax
            //   c7450c30e74100       | mov                 dword ptr [ebp + 0xc], 0x41e730
            //   e8????????           |                     
            //   68????????           |                     
            //   8d55ec               | lea                 edx, [ebp - 0x14]

        $sequence_5 = { 50 6800100000 8d8df4edffff 51 e8???????? 8b0d???????? 2b0d???????? }
            // n = 7, score = 200
            //   50                   | push                eax
            //   6800100000           | push                0x1000
            //   8d8df4edffff         | lea                 ecx, [ebp - 0x120c]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   2b0d????????         |                     

        $sequence_6 = { 52 c645fc04 e8???????? 8b9544ffffff 8d4dd4 51 50 }
            // n = 7, score = 200
            //   52                   | push                edx
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4
            //   e8????????           |                     
            //   8b9544ffffff         | mov                 edx, dword ptr [ebp - 0xbc]
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   51                   | push                ecx
            //   50                   | push                eax

        $sequence_7 = { 83c404 83c61c 3b35???????? 0f8551ffffff 8d8de8feffff e8???????? }
            // n = 6, score = 200
            //   83c404               | add                 esp, 4
            //   83c61c               | add                 esi, 0x1c
            //   3b35????????         |                     
            //   0f8551ffffff         | jne                 0xffffff57
            //   8d8de8feffff         | lea                 ecx, [ebp - 0x118]
            //   e8????????           |                     

        $sequence_8 = { 83e203 83f908 7229 f3a5 ff2495c0b54000 8bc7 }
            // n = 6, score = 200
            //   83e203               | and                 edx, 3
            //   83f908               | cmp                 ecx, 8
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495c0b54000       | jmp                 dword ptr [edx*4 + 0x40b5c0]
            //   8bc7                 | mov                 eax, edi

        $sequence_9 = { 50 8d45f4 64a300000000 8b4508 33c9 6a3e }
            // n = 6, score = 200
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   33c9                 | xor                 ecx, ecx
            //   6a3e                 | push                0x3e

    condition:
        7 of them and filesize < 362496
}