rule win_narilam_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.narilam."
        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.narilam"
        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 = { 9e 7515 dd82f8000000 d81d???????? dfe0 9e 7504 }
            // n = 7, score = 100
            //   9e                   | sahf                
            //   7515                 | jne                 0x17
            //   dd82f8000000         | fld                 qword ptr [edx + 0xf8]
            //   d81d????????         |                     
            //   dfe0                 | fnstsw              ax
            //   9e                   | sahf                
            //   7504                 | jne                 6

        $sequence_1 = { 56 57 b8???????? e8???????? be???????? 8dbd70e3f9ff b9a0860100 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   b8????????           |                     
            //   e8????????           |                     
            //   be????????           |                     
            //   8dbd70e3f9ff         | lea                 edi, [ebp - 0x61c90]
            //   b9a0860100           | mov                 ecx, 0x186a0

        $sequence_2 = { 8b853cffffff 8b10 ff5244 66c78564ffffffec00 8d45a8 e8???????? 8bc8 }
            // n = 7, score = 100
            //   8b853cffffff         | mov                 eax, dword ptr [ebp - 0xc4]
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   ff5244               | call                dword ptr [edx + 0x44]
            //   66c78564ffffffec00     | mov    word ptr [ebp - 0x9c], 0xec
            //   8d45a8               | lea                 eax, [ebp - 0x58]
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax

        $sequence_3 = { ebef 66b86a01 ebe9 66b86b01 ebe3 66b86c01 ebdd }
            // n = 7, score = 100
            //   ebef                 | jmp                 0xfffffff1
            //   66b86a01             | mov                 ax, 0x16a
            //   ebe9                 | jmp                 0xffffffeb
            //   66b86b01             | mov                 ax, 0x16b
            //   ebe3                 | jmp                 0xffffffe5
            //   66b86c01             | mov                 ax, 0x16c
            //   ebdd                 | jmp                 0xffffffdf

        $sequence_4 = { ba???????? 8d45f0 e8???????? ff45e4 8d55f0 8d45fc e8???????? }
            // n = 7, score = 100
            //   ba????????           |                     
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   e8????????           |                     
            //   ff45e4               | inc                 dword ptr [ebp - 0x1c]
            //   8d55f0               | lea                 edx, [ebp - 0x10]
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   e8????????           |                     

        $sequence_5 = { e8???????? b207 8bc6 e8???????? c686e800000001 8bc6 84db }
            // n = 7, score = 100
            //   e8????????           |                     
            //   b207                 | mov                 dl, 7
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     
            //   c686e800000001       | mov                 byte ptr [esi + 0xe8], 1
            //   8bc6                 | mov                 eax, esi
            //   84db                 | test                bl, bl

        $sequence_6 = { e8???????? 50 ff45ac ba???????? 8d45cc e8???????? ff45ac }
            // n = 7, score = 100
            //   e8????????           |                     
            //   50                   | push                eax
            //   ff45ac               | inc                 dword ptr [ebp - 0x54]
            //   ba????????           |                     
            //   8d45cc               | lea                 eax, [ebp - 0x34]
            //   e8????????           |                     
            //   ff45ac               | inc                 dword ptr [ebp - 0x54]

        $sequence_7 = { 648920 83ea01 7204 742d eb48 8bd7 8bc3 }
            // n = 7, score = 100
            //   648920               | mov                 dword ptr fs:[eax], esp
            //   83ea01               | sub                 edx, 1
            //   7204                 | jb                  6
            //   742d                 | je                  0x2f
            //   eb48                 | jmp                 0x4a
            //   8bd7                 | mov                 edx, edi
            //   8bc3                 | mov                 eax, ebx

        $sequence_8 = { ff8d2cffffff 8d8578ffffff ba02000000 e8???????? 66c78520ffffff7001 ba???????? 8d8574ffffff }
            // n = 7, score = 100
            //   ff8d2cffffff         | dec                 dword ptr [ebp - 0xd4]
            //   8d8578ffffff         | lea                 eax, [ebp - 0x88]
            //   ba02000000           | mov                 edx, 2
            //   e8????????           |                     
            //   66c78520ffffff7001     | mov    word ptr [ebp - 0xe0], 0x170
            //   ba????????           |                     
            //   8d8574ffffff         | lea                 eax, [ebp - 0x8c]

        $sequence_9 = { ff7308 8bc7 8bd6 e8???????? eb56 8b4308 ff7004 }
            // n = 7, score = 100
            //   ff7308               | push                dword ptr [ebx + 8]
            //   8bc7                 | mov                 eax, edi
            //   8bd6                 | mov                 edx, esi
            //   e8????????           |                     
            //   eb56                 | jmp                 0x58
            //   8b4308               | mov                 eax, dword ptr [ebx + 8]
            //   ff7004               | push                dword ptr [eax + 4]

    condition:
        7 of them and filesize < 3325952
}