rule win_newpass_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.newpass."
        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.newpass"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8d4801 e8???????? 4c8b542458 498902 8b0b c6040100 803d????????00 }
            // n = 7, score = 700
            //   8d4801               | dec                 ebp
            //   e8????????           |                     
            //   4c8b542458           | lea                 ecx, [ecx + 1]
            //   498902               | dec                 ecx
            //   8b0b                 | mov                 edx, dword ptr [esi + 8]
            //   c6040100             | dec                 ecx
            //   803d????????00       |                     

        $sequence_1 = { ba14000000 498bcf ff15???????? 85c0 0f8427ffffff eb38 488b5758 }
            // n = 7, score = 700
            //   ba14000000           | dec                 eax
            //   498bcf               | xor                 eax, esp
            //   ff15????????         |                     
            //   85c0                 | dec                 eax
            //   0f8427ffffff         | mov                 dword ptr [ebp - 9], eax
            //   eb38                 | dec                 ebp
            //   488b5758             | mov                 ebp, ecx

        $sequence_2 = { 0f95c0 85c0 0f94c0 84c0 7515 4183c702 4883c340 }
            // n = 7, score = 700
            //   0f95c0               | lea                 ecx, [ebp - 0x59]
            //   85c0                 | nop                 
            //   0f94c0               | dec                 eax
            //   84c0                 | cmp                 dword ptr [ebp + 0x2f], 8
            //   7515                 | jb                  0xa01
            //   4183c702             | dec                 eax
            //   4883c340             | mov                 ecx, dword ptr [ebp + 0x17]

        $sequence_3 = { 4d8bc4 eb0d 4983c8ff 49ffc0 47382401 75f7 }
            // n = 6, score = 700
            //   4d8bc4               | cmp                 dword ptr [esp + 0x50], 0x10
            //   eb0d                 | jb                  0x1e32
            //   4983c8ff             | inc                 ecx
            //   49ffc0               | test                bh, 1
            //   47382401             | je                  0x1e49
            //   75f7                 | inc                 ecx

        $sequence_4 = { c60700 498bc6 488b8c24b0000000 4833cc e8???????? 488b9c2410010000 4881c4c0000000 }
            // n = 7, score = 700
            //   c60700               | dec                 eax
            //   498bc6               | cmp                 esi, ebx
            //   488b8c24b0000000     | setne               al
            //   4833cc               | test                eax, eax
            //   e8????????           |                     
            //   488b9c2410010000     | sete                bl
            //   4881c4c0000000       | dec                 ecx

        $sequence_5 = { 48837dc810 480f4355b0 4889742420 4c8d4c2430 448bc3 488b8dd0100000 }
            // n = 6, score = 700
            //   48837dc810           | lea                 edx, [0x8429a]
            //   480f4355b0           | mov                 ecx, 0x35
            //   4889742420           | jmp                 0x930
            //   4c8d4c2430           | jne                 0x93e
            //   448bc3               | dec                 eax
            //   488b8dd0100000       | lea                 edx, [0x84e9a]

        $sequence_6 = { 7447 493bdd 742c 48837b1810 7208 488b0b e8???????? }
            // n = 7, score = 700
            //   7447                 | dec                 eax
            //   493bdd               | cmp                 dword ptr [ebx + 0x18], 0x10
            //   742c                 | jb                  0x1574
            //   48837b1810           | dec                 eax
            //   7208                 | mov                 ecx, dword ptr [ebx]
            //   488b0b               | dec                 esp
            //   e8????????           |                     

        $sequence_7 = { b001 488b4c2468 4833cc e8???????? 488b9c24a0000000 4883c470 }
            // n = 6, score = 700
            //   b001                 | jmp                 0x1a9
            //   488b4c2468           | dec                 eax
            //   4833cc               | mov                 eax, edi
            //   e8????????           |                     
            //   488b9c24a0000000     | dec                 eax
            //   4883c470             | mov                 dword ptr [ebp - 0x40], eax

        $sequence_8 = { 837e3000 0f8534010000 0fb603 3c30 7c25 ebc3 488bc3 }
            // n = 7, score = 700
            //   837e3000             | inc                 ecx
            //   0f8534010000         | dec                 eax
            //   0fb603               | inc                 edx
            //   3c30                 | cmp                 ecx, 0xd
            //   7c25                 | jb                  0x1840
            //   ebc3                 | inc                 ecx
            //   488bc3               | xor                 al, byte ptr [eax + edx]

        $sequence_9 = { 740c 3c0a 7408 3c0d 7404 3c09 7505 }
            // n = 7, score = 700
            //   740c                 | inc                 eax
            //   3c0a                 | inc                 ecx
            //   7408                 | xor                 al, byte ptr [eax + edx]
            //   3c0d                 | xor                 al, 0x26
            //   7404                 | mov                 byte ptr [edx], al
            //   3c09                 | dec                 eax
            //   7505                 | or                  eax, 0xffffff00

    condition:
        7 of them and filesize < 2654208
}