rule win_erebus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.erebus."
        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.erebus"
        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 = { 57 ff750c e8???????? 83c41c 8d4c246c ffb424b4000000 ffb424bc000000 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   8d4c246c             | lea                 ecx, [esp + 0x6c]
            //   ffb424b4000000       | push                dword ptr [esp + 0xb4]
            //   ffb424bc000000       | push                dword ptr [esp + 0xbc]

        $sequence_1 = { 83fa40 7707 ba40000000 eb19 8d42ff 8d4c241c 8944241c }
            // n = 7, score = 100
            //   83fa40               | cmp                 edx, 0x40
            //   7707                 | ja                  9
            //   ba40000000           | mov                 edx, 0x40
            //   eb19                 | jmp                 0x1b
            //   8d42ff               | lea                 eax, [edx - 1]
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax

        $sequence_2 = { 7433 8b07 83f81d 7d2c 83f81a 7c06 837d0c04 }
            // n = 7, score = 100
            //   7433                 | je                  0x35
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   83f81d               | cmp                 eax, 0x1d
            //   7d2c                 | jge                 0x2e
            //   83f81a               | cmp                 eax, 0x1a
            //   7c06                 | jl                  8
            //   837d0c04             | cmp                 dword ptr [ebp + 0xc], 4

        $sequence_3 = { e8???????? 83c404 c645fc06 83bd14ffffff10 c745c00f000000 c745bc00000000 c645ac00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   83bd14ffffff10       | cmp                 dword ptr [ebp - 0xec], 0x10
            //   c745c00f000000       | mov                 dword ptr [ebp - 0x40], 0xf
            //   c745bc00000000       | mov                 dword ptr [ebp - 0x44], 0
            //   c645ac00             | mov                 byte ptr [ebp - 0x54], 0

        $sequence_4 = { c741140f000000 c7411000000000 50 c60100 e8???????? 8d8d30ffffff e8???????? }
            // n = 7, score = 100
            //   c741140f000000       | mov                 dword ptr [ecx + 0x14], 0xf
            //   c7411000000000       | mov                 dword ptr [ecx + 0x10], 0
            //   50                   | push                eax
            //   c60100               | mov                 byte ptr [ecx], 0
            //   e8????????           |                     
            //   8d8d30ffffff         | lea                 ecx, [ebp - 0xd0]
            //   e8????????           |                     

        $sequence_5 = { ff35???????? 50 e8???????? ff35???????? e8???????? 83c404 8d045b }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d045b               | lea                 eax, [ebx + ebx*2]

        $sequence_6 = { 68???????? c744241000000000 c705????????402b4f00 e8???????? 83c404 8b442414 8b4c2418 }
            // n = 7, score = 100
            //   68????????           |                     
            //   c744241000000000     | mov                 dword ptr [esp + 0x10], 0
            //   c705????????402b4f00     |     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]

        $sequence_7 = { 8d44240c c644245c00 50 c7442410a0fb4f00 e8???????? 8b4c2450 64890d00000000 }
            // n = 7, score = 100
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   c644245c00           | mov                 byte ptr [esp + 0x5c], 0
            //   50                   | push                eax
            //   c7442410a0fb4f00     | mov                 dword ptr [esp + 0x10], 0x4ffba0
            //   e8????????           |                     
            //   8b4c2450             | mov                 ecx, dword ptr [esp + 0x50]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_8 = { 2142fc 5b 5f 5e c20400 68???????? e8???????? }
            // n = 7, score = 100
            //   2142fc               | and                 dword ptr [edx - 4], eax
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_9 = { 8bcb 6a00 8b4014 ffd0 8b7510 8d4c2478 0fb6c0 }
            // n = 7, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   6a00                 | push                0
            //   8b4014               | mov                 eax, dword ptr [eax + 0x14]
            //   ffd0                 | call                eax
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   8d4c2478             | lea                 ecx, [esp + 0x78]
            //   0fb6c0               | movzx               eax, al

    condition:
        7 of them and filesize < 2564096
}