rule win_atlas_agent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { 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 = { 740d c74424640f000000 e9???????? 488d8424a0000000 }
            // n = 4, score = 100
            //   740d                 | je                  0xf
            //   c74424640f000000     | mov                 dword ptr [esp + 0x64], 0xd
            //   e9????????           |                     
            //   488d8424a0000000     | dec                 eax

        $sequence_3 = { 740d c74424640c000000 e9???????? 8b442474 488b8c24a0000000 482bc8 }
            // n = 6, score = 100
            //   740d                 | je                  0xf
            //   c74424640c000000     | mov                 dword ptr [esp + 0x64], 0xc
            //   e9????????           |                     
            //   8b442474             | mov                 eax, dword ptr [esp + 0x74]
            //   488b8c24a0000000     | dec                 eax
            //   482bc8               | mov                 ecx, dword ptr [esp + 0xa0]

        $sequence_4 = { 8b00 8945bc 8d4d88 e8???????? }
            // n = 4, score = 100
            //   8b00                 | dec                 eax
            //   8945bc               | mov                 eax, dword ptr [eax + 0x10]
            //   8d4d88               | je                  0x10
            //   e8????????           |                     

        $sequence_5 = { 740e 488d050f390400 4889442420 eb0e }
            // n = 4, score = 100
            //   740e                 | mov                 dword ptr [esp + 0x64], 0xf
            //   488d050f390400       | dec                 eax
            //   4889442420           | lea                 eax, [esp + 0xa0]
            //   eb0e                 | dec                 eax

        $sequence_6 = { 8a95a4f8ffff 8895c3f8ffff c645fc01 8d8db8f9ffff e8???????? c645fc00 8d8da0f9ffff }
            // n = 7, score = 100
            //   8a95a4f8ffff         | dec                 eax
            //   8895c3f8ffff         | cmp                 ebx, edi
            //   c645fc01             | je                  0xb5
            //   8d8db8f9ffff         | dec                 ebp
            //   e8????????           |                     
            //   c645fc00             | mov                 esi, dword ptr [esi + esi*8 + 0x48d80]
            //   8d8da0f9ffff         | je                  0x10

        $sequence_7 = { 8b00 8945ec 8d4dd0 51 }
            // n = 4, score = 100
            //   8b00                 | mov                 dword ptr [esp + 0x28], eax
            //   8945ec               | jmp                 0x1a
            //   8d4dd0               | movzx               ecx, byte ptr [edx + ecx]
            //   51                   | and                 ecx, 0x3c

        $sequence_8 = { 8b00 8945f0 8d4dff 51 }
            // n = 4, score = 100
            //   8b00                 | lea                 ecx, [ebp - 0x148]
            //   8945f0               | mov                 dl, byte ptr [ebp - 0x218]
            //   8d4dff               | mov                 byte ptr [ebp - 0x201], dl
            //   51                   | mov                 byte ptr [ebp - 4], 2

        $sequence_9 = { 740d c74424640c000000 e9???????? b808000000 486bc000 488d8404a0010000 }
            // n = 6, score = 100
            //   740d                 | mov                 eax, 8
            //   c74424640c000000     | je                  0xf
            //   e9????????           |                     
            //   b808000000           | mov                 dword ptr [esp + 0x64], 0xc
            //   486bc000             | mov                 eax, 8
            //   488d8404a0010000     | dec                 eax

        $sequence_10 = { 8a95e8fdffff 8895fffdffff c645fc02 8d8db8feffff }
            // n = 4, score = 100
            //   8a95e8fdffff         | dec                 eax
            //   8895fffdffff         | cmp                 ebx, edi
            //   c645fc02             | je                  0xb5
            //   8d8db8feffff         | dec                 ebp

        $sequence_11 = { 740e 483bdf 0f84ac000000 e9???????? 4d8bb4f6808d0400 }
            // n = 5, score = 100
            //   740e                 | dec                 eax
            //   483bdf               | mov                 eax, dword ptr [esp + 0xc8]
            //   0f84ac000000         | dec                 eax
            //   e9????????           |                     
            //   4d8bb4f6808d0400     | mov                 dword ptr [esp + 0x20], eax

        $sequence_12 = { 8b00 8945bc 8b4d28 e8???????? }
            // n = 4, score = 100
            //   8b00                 | mov                 dword ptr [esp + 0x20], eax
            //   8945bc               | jmp                 0x1c
            //   8b4d28               | je                  0x10
            //   e8????????           |                     

        $sequence_13 = { 740d c74424640d000000 e9???????? 488d842400010000 }
            // n = 4, score = 100
            //   740d                 | dec                 eax
            //   c74424640d000000     | lea                 eax, [esp + eax + 0x1a0]
            //   e9????????           |                     
            //   488d842400010000     | je                  0xf

    condition:
        7 of them and filesize < 857088
}