rule win_atlas_agent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.atlas_agent."
        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.atlas_agent"
        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 = { 0fb60c0a 83e13c c1f902 03c1 }
            // n = 4, score = 200
            //   0fb60c0a             | movzx               ecx, byte ptr [edx + ecx]
            //   83e13c               | and                 ecx, 0x3c
            //   c1f902               | sar                 ecx, 2
            //   03c1                 | add                 eax, ecx

        $sequence_1 = { 8bc1 99 b903000000 f7f9 c1e002 }
            // n = 5, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   99                   | cdq                 
            //   b903000000           | mov                 ecx, 3
            //   f7f9                 | idiv                ecx
            //   c1e002               | shl                 eax, 2

        $sequence_2 = { 57 4883ec48 488d4c2420 e8???????? }
            // n = 4, score = 100
            //   57                   | push                edi
            //   4883ec48             | dec                 eax
            //   488d4c2420           | sub                 esp, 0x48
            //   e8????????           |                     

        $sequence_3 = { 8b00 8945bc 8d4d88 e8???????? }
            // n = 4, score = 100
            //   8b00                 | mov                 eax, dword ptr [esp + 0x70]
            //   8945bc               | dec                 eax
            //   8d4d88               | mov                 dword ptr [esp + 0x48], eax
            //   e8????????           |                     

        $sequence_4 = { 57 4883ec58 488b442470 488b00 488b4040 }
            // n = 5, score = 100
            //   57                   | mov                 edi, eax
            //   4883ec58             | xor                 eax, eax
            //   488b442470           | push                edi
            //   488b00               | dec                 eax
            //   488b4040             | sub                 esp, 0x50

        $sequence_5 = { 57 4883ec58 488d442438 488bf8 }
            // n = 4, score = 100
            //   57                   | xor                 eax, eax
            //   4883ec58             | mov                 ecx, 1
            //   488d442438           | rep stosb           byte ptr es:[edi], al
            //   488bf8               | push                edi

        $sequence_6 = { 8b00 8945ec 8d4dd0 51 }
            // n = 4, score = 100
            //   8b00                 | sub                 esp, 0x60
            //   8945ec               | dec                 eax
            //   8d4dd0               | mov                 eax, dword ptr [esp + 0x70]
            //   51                   | dec                 eax

        $sequence_7 = { 8b00 8945f0 8d4dff 51 }
            // n = 4, score = 100
            //   8b00                 | sar                 ecx, 2
            //   8945f0               | add                 eax, ecx
            //   8d4dff               | mov                 eax, ecx
            //   51                   | cdq                 

        $sequence_8 = { 8a95a4f8ffff 8895c3f8ffff c645fc01 8d8db8f9ffff }
            // n = 4, score = 100
            //   8a95a4f8ffff         | mov                 edi, eax
            //   8895c3f8ffff         | xor                 eax, eax
            //   c645fc01             | push                edi
            //   8d8db8f9ffff         | dec                 eax

        $sequence_9 = { 57 4883ec50 488d442433 488bf8 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   4883ec50             | dec                 eax
            //   488d442433           | sub                 esp, 0x50
            //   488bf8               | inc                 ecx

        $sequence_10 = { 8a95e8fdffff 8895fffdffff c645fc02 8d8db8feffff }
            // n = 4, score = 100
            //   8a95e8fdffff         | mov                 ecx, 0x18
            //   8895fffdffff         | rep stosb           byte ptr es:[edi], al
            //   c645fc02             | push                edi
            //   8d8db8feffff         | dec                 eax

        $sequence_11 = { 57 4883ec60 488b442470 4889442448 488b542478 }
            // n = 5, score = 100
            //   57                   | mov                 eax, dword ptr [eax]
            //   4883ec60             | dec                 eax
            //   488b442470           | mov                 eax, dword ptr [eax + 0x40]
            //   4889442448           | dec                 eax
            //   488b542478           | mov                 dword ptr [esp + 0x30], eax

        $sequence_12 = { 8b00 8945bc 8b4d28 e8???????? }
            // n = 4, score = 100
            //   8b00                 | dec                 eax
            //   8945bc               | mov                 edi, dword ptr [esp + 0x78]
            //   8b4d28               | dec                 eax
            //   e8????????           |                     

        $sequence_13 = { 57 4883ec50 418bd9 498bf8 8bf2 4c8d0de57f0100 }
            // n = 6, score = 100
            //   57                   | mov                 edi, dword ptr [esp + 0x68]
            //   4883ec50             | dec                 eax
            //   418bd9               | mov                 esi, eax
            //   498bf8               | push                edi
            //   8bf2                 | dec                 eax
            //   4c8d0de57f0100       | sub                 esp, 0x48

    condition:
        7 of them and filesize < 857088
}