rule win_andromeda_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.andromeda."
        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.andromeda"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 301439 41 3b4d14 75c3 }
            // n = 4, score = 800
            //   301439               | xor                 byte ptr [ecx + edi], dl
            //   41                   | inc                 ecx
            //   3b4d14               | cmp                 ecx, dword ptr [ebp + 0x14]
            //   75c3                 | jne                 0xffffffc5

        $sequence_1 = { 7408 43 3b5d0c 74cf }
            // n = 4, score = 800
            //   7408                 | je                  0xa
            //   43                   | inc                 ebx
            //   3b5d0c               | cmp                 ebx, dword ptr [ebp + 0xc]
            //   74cf                 | je                  0xffffffd1

        $sequence_2 = { 33d2 8b7d10 fec0 368a942800ffffff }
            // n = 4, score = 800
            //   33d2                 | xor                 edx, edx
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   fec0                 | inc                 al
            //   368a942800ffffff     | mov                 dl, byte ptr ss:[eax + ebp - 0x100]

        $sequence_3 = { 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff }
            // n = 5, score = 800
            //   81c400ffffff         | add                 esp, 0xffffff00
            //   60                   | pushal              
            //   b940000000           | mov                 ecx, 0x40
            //   8d7dfc               | lea                 edi, [ebp - 4]
            //   b8fcfdfeff           | mov                 eax, 0xfffefdfc

        $sequence_4 = { 368a942900ffffff 02c2 020433 368ab42800ffffff }
            // n = 4, score = 800
            //   368a942900ffffff     | mov                 dl, byte ptr ss:[ecx + ebp - 0x100]
            //   02c2                 | add                 al, dl
            //   020433               | add                 al, byte ptr [ebx + esi]
            //   368ab42800ffffff     | mov                 dh, byte ptr ss:[eax + ebp - 0x100]

        $sequence_5 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 }
            // n = 6, score = 800
            //   368a942800ffffff     | mov                 dl, byte ptr ss:[eax + ebp - 0x100]
            //   02da                 | add                 bl, dl
            //   368ab42b00ffffff     | mov                 dh, byte ptr ss:[ebx + ebp - 0x100]
            //   3688b42800ffffff     | mov                 byte ptr ss:[eax + ebp - 0x100], dh
            //   3688942b00ffffff     | mov                 byte ptr ss:[ebx + ebp - 0x100], dl
            //   02d6                 | add                 dl, dh

        $sequence_6 = { 3688942800ffffff fec1 7408 43 }
            // n = 4, score = 800
            //   3688942800ffffff     | mov                 byte ptr ss:[eax + ebp - 0x100], dl
            //   fec1                 | inc                 cl
            //   7408                 | je                  0xa
            //   43                   | inc                 ebx

        $sequence_7 = { b8fcfdfeff fd ab 2d04040404 e2f8 fc 33c0 }
            // n = 7, score = 800
            //   b8fcfdfeff           | mov                 eax, 0xfffefdfc
            //   fd                   | std                 
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   2d04040404           | sub                 eax, 0x4040404
            //   e2f8                 | loop                0xfffffffa
            //   fc                   | cld                 
            //   33c0                 | xor                 eax, eax

        $sequence_8 = { 60 e8???????? 5d 81ed???????? 33c9 }
            // n = 5, score = 700
            //   60                   | pushal              
            //   e8????????           |                     
            //   5d                   | pop                 ebp
            //   81ed????????         |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_9 = { 50 e8???????? 83c40c 6800000100 e8???????? }
            // n = 5, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6800000100           | push                0x10000
            //   e8????????           |                     

        $sequence_10 = { 8a06 33c9 3c5a 0f9ec1 33d2 }
            // n = 5, score = 400
            //   8a06                 | mov                 al, byte ptr [esi]
            //   33c9                 | xor                 ecx, ecx
            //   3c5a                 | cmp                 al, 0x5a
            //   0f9ec1               | setle               cl
            //   33d2                 | xor                 edx, edx

        $sequence_11 = { 0f9dc2 85ca 7404 0420 }
            // n = 4, score = 400
            //   0f9dc2               | setge               dl
            //   85ca                 | test                edx, ecx
            //   7404                 | je                  6
            //   0420                 | add                 al, 0x20

        $sequence_12 = { 0fb64601 84c0 7905 0d00ffffff }
            // n = 4, score = 400
            //   0fb64601             | movzx               eax, byte ptr [esi + 1]
            //   84c0                 | test                al, al
            //   7905                 | jns                 7
            //   0d00ffffff           | or                  eax, 0xffffff00

        $sequence_13 = { 6a30 8d45d0 50 6a01 ff7508 e8???????? }
            // n = 6, score = 400
            //   6a30                 | push                0x30
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   50                   | push                eax
            //   6a01                 | push                1
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_14 = { 8945e4 e8???????? 8945e8 3bc6 }
            // n = 4, score = 300
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   e8????????           |                     
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   3bc6                 | cmp                 eax, esi

        $sequence_15 = { 8975bc 8b35???????? 83c40c c745c040040000 }
            // n = 4, score = 300
            //   8975bc               | mov                 dword ptr [ebp - 0x44], esi
            //   8b35????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   c745c040040000       | mov                 dword ptr [ebp - 0x40], 0x440

        $sequence_16 = { 6a10 8d45e0 50 ff75f0 }
            // n = 4, score = 200
            //   6a10                 | push                0x10
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   ff75f0               | push                dword ptr [ebp - 0x10]

        $sequence_17 = { ff75fc 6a00 e8???????? 6a00 ff75f8 ff75fc }
            // n = 6, score = 200
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   6a00                 | push                0
            //   e8????????           |                     
            //   6a00                 | push                0
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_18 = { 0f8476010000 6804010000 6a00 ff35???????? }
            // n = 4, score = 200
            //   0f8476010000         | je                  0x17c
            //   6804010000           | push                0x104
            //   6a00                 | push                0
            //   ff35????????         |                     

        $sequence_19 = { ff75fc e8???????? 6a06 ff75f8 e8???????? 8d45f4 50 }
            // n = 7, score = 200
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   6a06                 | push                6
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax

        $sequence_20 = { 6a01 6a00 6a00 68???????? 6a00 e8???????? eba9 }
            // n = 7, score = 200
            //   6a01                 | push                1
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     
            //   6a00                 | push                0
            //   e8????????           |                     
            //   eba9                 | jmp                 0xffffffab

        $sequence_21 = { 7466 6a05 ff75f0 e8???????? 83f8ff 7457 }
            // n = 6, score = 200
            //   7466                 | je                  0x68
            //   6a05                 | push                5
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   7457                 | je                  0x59

        $sequence_22 = { 83f8ff 7457 33c0 8d7d9c }
            // n = 4, score = 200
            //   83f8ff               | cmp                 eax, -1
            //   7457                 | je                  0x59
            //   33c0                 | xor                 eax, eax
            //   8d7d9c               | lea                 edi, [ebp - 0x64]

        $sequence_23 = { 6a00 68???????? 6801000080 e8???????? 83f800 7526 ff75f8 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   68????????           |                     
            //   6801000080           | push                0x80000001
            //   e8????????           |                     
            //   83f800               | cmp                 eax, 0
            //   7526                 | jne                 0x28
            //   ff75f8               | push                dword ptr [ebp - 8]

        $sequence_24 = { ff5634 8365f400 8bf8 ff5634 8b4d0c }
            // n = 5, score = 100
            //   ff5634               | call                dword ptr [esi + 0x34]
            //   8365f400             | and                 dword ptr [ebp - 0xc], 0
            //   8bf8                 | mov                 edi, eax
            //   ff5634               | call                dword ptr [esi + 0x34]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_25 = { 81e32a861356 81f71b1ccc93 81f3db50ed3e 8945ec 81ff7185baee 7456 85c0 }
            // n = 7, score = 100
            //   81e32a861356         | and                 ebx, 0x5613862a
            //   81f71b1ccc93         | xor                 edi, 0x93cc1c1b
            //   81f3db50ed3e         | xor                 ebx, 0x3eed50db
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   81ff7185baee         | cmp                 edi, 0xeeba8571
            //   7456                 | je                  0x58
            //   85c0                 | test                eax, eax

        $sequence_26 = { eb10 8bc7 23450c 3dd39987df 0f85da000000 ff560c 0faf450c }
            // n = 7, score = 100
            //   eb10                 | jmp                 0x12
            //   8bc7                 | mov                 eax, edi
            //   23450c               | and                 eax, dword ptr [ebp + 0xc]
            //   3dd39987df           | cmp                 eax, 0xdf8799d3
            //   0f85da000000         | jne                 0xe0
            //   ff560c               | call                dword ptr [esi + 0xc]
            //   0faf450c             | imul                eax, dword ptr [ebp + 0xc]

        $sequence_27 = { 6af5 8bf8 ff5630 0bd8 }
            // n = 4, score = 100
            //   6af5                 | push                -0xb
            //   8bf8                 | mov                 edi, eax
            //   ff5630               | call                dword ptr [esi + 0x30]
            //   0bd8                 | or                  ebx, eax

        $sequence_28 = { 50 ff7510 ff5644 8b45fc }
            // n = 4, score = 100
            //   50                   | push                eax
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff5644               | call                dword ptr [esi + 0x44]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_29 = { 837de8ff 0f8490000000 837d1400 74bf 8b45fc f60010 }
            // n = 6, score = 100
            //   837de8ff             | cmp                 dword ptr [ebp - 0x18], -1
            //   0f8490000000         | je                  0x96
            //   837d1400             | cmp                 dword ptr [ebp + 0x14], 0
            //   74bf                 | je                  0xffffffc1
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   f60010               | test                byte ptr [eax], 0x10

        $sequence_30 = { 0bf8 81fb37355e10 0f856afeffff e9???????? 55 8bec }
            // n = 6, score = 100
            //   0bf8                 | or                  edi, eax
            //   81fb37355e10         | cmp                 ebx, 0x105e3537
            //   0f856afeffff         | jne                 0xfffffe70
            //   e9????????           |                     
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_31 = { 894508 ff5630 8bd8 ff5638 }
            // n = 4, score = 100
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   ff5630               | call                dword ptr [esi + 0x30]
            //   8bd8                 | mov                 ebx, eax
            //   ff5638               | call                dword ptr [esi + 0x38]

    condition:
        7 of them and filesize < 204800
}