rule win_newposthings_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.newposthings."
        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.newposthings"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 837d3410 720b ff7520 e8???????? 83c404 }
            // n = 5, score = 100
            //   837d3410             | cmp                 dword ptr [ebp + 0x34], 0x10
            //   720b                 | jb                  0xd
            //   ff7520               | push                dword ptr [ebp + 0x20]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_1 = { 6afe 8d45f0 50 68e4010210 e8???????? 83c40c 83c8ff }
            // n = 7, score = 100
            //   6afe                 | push                -2
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   68e4010210           | push                0x100201e4
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_2 = { 6843120110 e8???????? 83c418 85c0 7903 c60600 83f8fe }
            // n = 7, score = 100
            //   6843120110           | push                0x10011243
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   85c0                 | test                eax, eax
            //   7903                 | jns                 5
            //   c60600               | mov                 byte ptr [esi], 0
            //   83f8fe               | cmp                 eax, -2

        $sequence_3 = { 50 8d8d68ffffff c78540ffffff0f000000 c7853cffffff00000000 c6852cffffff00 c7857cffffff0f000000 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   8d8d68ffffff         | lea                 ecx, [ebp - 0x98]
            //   c78540ffffff0f000000     | mov    dword ptr [ebp - 0xc0], 0xf
            //   c7853cffffff00000000     | mov    dword ptr [ebp - 0xc4], 0
            //   c6852cffffff00       | mov                 byte ptr [ebp - 0xd4], 0
            //   c7857cffffff0f000000     | mov    dword ptr [ebp - 0x84], 0xf

        $sequence_4 = { ffd6 8d442410 50 ffd7 6a00 6a00 53 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   53                   | push                ebx

        $sequence_5 = { 59 48 5d c3 8b0d???????? 83c901 }
            // n = 6, score = 100
            //   59                   | pop                 ecx
            //   48                   | dec                 eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b0d????????         |                     
            //   83c901               | or                  ecx, 1

        $sequence_6 = { 8b3495481d0210 8a441e04 84c0 0f8957020000 807d1302 0f846d020000 }
            // n = 6, score = 100
            //   8b3495481d0210       | mov                 esi, dword ptr [edx*4 + 0x10021d48]
            //   8a441e04             | mov                 al, byte ptr [esi + ebx + 4]
            //   84c0                 | test                al, al
            //   0f8957020000         | jns                 0x25d
            //   807d1302             | cmp                 byte ptr [ebp + 0x13], 2
            //   0f846d020000         | je                  0x273

        $sequence_7 = { 8d8d14ffffff e8???????? 83c404 c645fc07 8d4d08 51 }
            // n = 6, score = 100
            //   8d8d14ffffff         | lea                 ecx, [ebp - 0xec]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c645fc07             | mov                 byte ptr [ebp - 4], 7
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   51                   | push                ecx

        $sequence_8 = { 8b06 3b4210 0f92c1 884de4 84c9 7404 8b12 }
            // n = 7, score = 100
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   3b4210               | cmp                 eax, dword ptr [edx + 0x10]
            //   0f92c1               | setb                cl
            //   884de4               | mov                 byte ptr [ebp - 0x1c], cl
            //   84c9                 | test                cl, cl
            //   7404                 | je                  6
            //   8b12                 | mov                 edx, dword ptr [edx]

        $sequence_9 = { 75f8 8bca c1e902 f3a5 8d8508feffff 8bca 50 }
            // n = 7, score = 100
            //   75f8                 | jne                 0xfffffffa
            //   8bca                 | mov                 ecx, edx
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8d8508feffff         | lea                 eax, [ebp - 0x1f8]
            //   8bca                 | mov                 ecx, edx
            //   50                   | push                eax

    condition:
        7 of them and filesize < 827392
}