rule win_tarsip_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.tarsip."
        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.tarsip"
        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 = { 8d8424c8010000 83c40c 8d5001 8a08 40 3acb 75f9 }
            // n = 7, score = 100
            //   8d8424c8010000       | lea                 eax, [esp + 0x1c8]
            //   83c40c               | add                 esp, 0xc
            //   8d5001               | lea                 edx, [eax + 1]
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   40                   | inc                 eax
            //   3acb                 | cmp                 cl, bl
            //   75f9                 | jne                 0xfffffffb

        $sequence_1 = { ff15???????? 8b0424 59 c3 83f801 753a 8b8ea0830000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8b0424               | mov                 eax, dword ptr [esp]
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   83f801               | cmp                 eax, 1
            //   753a                 | jne                 0x3c
            //   8b8ea0830000         | mov                 ecx, dword ptr [esi + 0x83a0]

        $sequence_2 = { e8???????? 83c408 c78424bc080000ffffffff 39b42484000000 0f8291020000 8b442470 e9???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   c78424bc080000ffffffff     | mov    dword ptr [esp + 0x8bc], 0xffffffff
            //   39b42484000000       | cmp                 dword ptr [esp + 0x84], esi
            //   0f8291020000         | jb                  0x297
            //   8b442470             | mov                 eax, dword ptr [esp + 0x70]
            //   e9????????           |                     

        $sequence_3 = { 51 8d542424 52 ffd6 8d442448 50 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   8d542424             | lea                 edx, [esp + 0x24]
            //   52                   | push                edx
            //   ffd6                 | call                esi
            //   8d442448             | lea                 eax, [esp + 0x48]
            //   50                   | push                eax

        $sequence_4 = { 51 e8???????? 83c404 33c0 e9???????? 8b54242c 8d3c02 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   8b54242c             | mov                 edx, dword ptr [esp + 0x2c]
            //   8d3c02               | lea                 edi, [edx + eax]

        $sequence_5 = { 56 ff15???????? 5b 33c0 5e c3 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   5b                   | pop                 ebx
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   c3                   | ret                 

        $sequence_6 = { b9???????? e8???????? 8bdd e8???????? 33c0 }
            // n = 5, score = 100
            //   b9????????           |                     
            //   e8????????           |                     
            //   8bdd                 | mov                 ebx, ebp
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax

        $sequence_7 = { e8???????? 81c468070000 c20800 56 6a01 8d442418 6a04 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   81c468070000         | add                 esp, 0x768
            //   c20800               | ret                 8
            //   56                   | push                esi
            //   6a01                 | push                1
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   6a04                 | push                4

        $sequence_8 = { ff34c5bc364200 53 57 e8???????? 83c40c 85c0 740d }
            // n = 7, score = 100
            //   ff34c5bc364200       | push                dword ptr [eax*8 + 0x4236bc]
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf

        $sequence_9 = { ebc9 8bc8 c1f905 8d1c8d00704200 8bf8 83e71f }
            // n = 6, score = 100
            //   ebc9                 | jmp                 0xffffffcb
            //   8bc8                 | mov                 ecx, eax
            //   c1f905               | sar                 ecx, 5
            //   8d1c8d00704200       | lea                 ebx, [ecx*4 + 0x427000]
            //   8bf8                 | mov                 edi, eax
            //   83e71f               | and                 edi, 0x1f

    condition:
        7 of them and filesize < 360448
}