rule win_rifdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.rifdoor."
        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.rifdoor"
        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 ffd6 8d4c2410 a3???????? 51 b810000000 }
            // n = 6, score = 200
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   a3????????           |                     
            //   51                   | push                ecx
            //   b810000000           | mov                 eax, 0x10

        $sequence_1 = { ff15???????? 5f b001 5e 81c408010000 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   b001                 | mov                 al, 1
            //   5e                   | pop                 esi
            //   81c408010000         | add                 esp, 0x108

        $sequence_2 = { e8???????? 8b4de4 83c40c 6bc930 8975e0 8db1304b4100 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   83c40c               | add                 esp, 0xc
            //   6bc930               | imul                ecx, ecx, 0x30
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8db1304b4100         | lea                 esi, [ecx + 0x414b30]

        $sequence_3 = { 02c9 02c9 880c30 eb26 }
            // n = 4, score = 200
            //   02c9                 | add                 cl, cl
            //   02c9                 | add                 cl, cl
            //   880c30               | mov                 byte ptr [eax + esi], cl
            //   eb26                 | jmp                 0x28

        $sequence_4 = { 85d2 7e6d 83f93d 7468 83f920 }
            // n = 5, score = 200
            //   85d2                 | test                edx, edx
            //   7e6d                 | jle                 0x6f
            //   83f93d               | cmp                 ecx, 0x3d
            //   7468                 | je                  0x6a
            //   83f920               | cmp                 ecx, 0x20

        $sequence_5 = { 52 b808000000 b9???????? 895c2414 e8???????? 8be8 }
            // n = 6, score = 200
            //   52                   | push                edx
            //   b808000000           | mov                 eax, 8
            //   b9????????           |                     
            //   895c2414             | mov                 dword ptr [esp + 0x14], ebx
            //   e8????????           |                     
            //   8be8                 | mov                 ebp, eax

        $sequence_6 = { e8???????? 83c410 6a00 8d84240c010000 50 ff15???????? 6a00 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   6a00                 | push                0
            //   8d84240c010000       | lea                 eax, [esp + 0x10c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_7 = { c3 397c240c 74e1 ba4f000000 8bc2 }
            // n = 5, score = 200
            //   c3                   | ret                 
            //   397c240c             | cmp                 dword ptr [esp + 0xc], edi
            //   74e1                 | je                  0xffffffe3
            //   ba4f000000           | mov                 edx, 0x4f
            //   8bc2                 | mov                 eax, edx

        $sequence_8 = { 52 8d45e8 50 8d8de8f7ffff }
            // n = 4, score = 100
            //   52                   | push                edx
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax
            //   8d8de8f7ffff         | lea                 ecx, [ebp - 0x818]

        $sequence_9 = { b9843a0000 81fb843a0000 7702 8bcb 2bd9 be2c1a0000 33ff }
            // n = 7, score = 100
            //   b9843a0000           | mov                 ecx, 0x3a84
            //   81fb843a0000         | cmp                 ebx, 0x3a84
            //   7702                 | ja                  4
            //   8bcb                 | mov                 ecx, ebx
            //   2bd9                 | sub                 ebx, ecx
            //   be2c1a0000           | mov                 esi, 0x1a2c
            //   33ff                 | xor                 edi, edi

        $sequence_10 = { eb08 ff15???????? 33c9 b873b2e745 f72d???????? }
            // n = 5, score = 100
            //   eb08                 | jmp                 0xa
            //   ff15????????         |                     
            //   33c9                 | xor                 ecx, ecx
            //   b873b2e745           | mov                 eax, 0x45e7b273
            //   f72d????????         |                     

        $sequence_11 = { 83c103 51 ffd3 a3???????? eb2c 8b14b7 83c203 }
            // n = 7, score = 100
            //   83c103               | add                 ecx, 3
            //   51                   | push                ecx
            //   ffd3                 | call                ebx
            //   a3????????           |                     
            //   eb2c                 | jmp                 0x2e
            //   8b14b7               | mov                 edx, dword ptr [edi + esi*4]
            //   83c203               | add                 edx, 3

        $sequence_12 = { 83c40c 8d8d68fcffff 51 8d9574fcffff 52 6a00 }
            // n = 6, score = 100
            //   83c40c               | add                 esp, 0xc
            //   8d8d68fcffff         | lea                 ecx, [ebp - 0x398]
            //   51                   | push                ecx
            //   8d9574fcffff         | lea                 edx, [ebp - 0x38c]
            //   52                   | push                edx
            //   6a00                 | push                0

        $sequence_13 = { 68ff000000 e8???????? 59 59 8b7508 8d34f5000d4100 391e }
            // n = 7, score = 100
            //   68ff000000           | push                0xff
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   8d34f5000d4100       | lea                 esi, [esi*8 + 0x410d00]
            //   391e                 | cmp                 dword ptr [esi], ebx

        $sequence_14 = { ff15???????? 8bf8 83ffff 0f84bb000000 53 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   83ffff               | cmp                 edi, -1
            //   0f84bb000000         | je                  0xc1
            //   53                   | push                ebx

        $sequence_15 = { c785e4bcffff44000000 899d1cbdffff c78510bdffff01010000 66898514bdffff 33f6 8d642400 8d8d40bdffff }
            // n = 7, score = 100
            //   c785e4bcffff44000000     | mov    dword ptr [ebp - 0x431c], 0x44
            //   899d1cbdffff         | mov                 dword ptr [ebp - 0x42e4], ebx
            //   c78510bdffff01010000     | mov    dword ptr [ebp - 0x42f0], 0x101
            //   66898514bdffff       | mov                 word ptr [ebp - 0x42ec], ax
            //   33f6                 | xor                 esi, esi
            //   8d642400             | lea                 esp, [esp]
            //   8d8d40bdffff         | lea                 ecx, [ebp - 0x42c0]

    condition:
        7 of them and filesize < 212992
}

rule win_rifdoor_w0 {
	meta:
	    description = "detect_rifdoor"
	    author = "@malgamy12"
	    date = "2022/11/11"
	    license = "DRL 1.1"
        hash1 = "19b2144927bd071e30df9fce5f3d49f1"
        hash2 = "d8ba4b4bfc5e0877fa8e8c1b26876ea6"
        hash3 = "d94d6f773c0ed5514d3e571e4b3681ba"
        hash4 = "5aca1e4ec64ba417d1b0ebea88bdd06e"
        hash5 = "45f8d44cba70520ca2ea97427ddaab3e"
        hash6 = "d3b2956904bed8c8146b8bb556b8911a"
        hash7 = "e4c4c9abdd8613afa17f58d721039a46"
        hash8 = "cf847663a7a9d6ddbe3a1f0d5e5236b6"
        hash9 = "01a0b932d82ed3b78ccfb2bb5826c32f"
        hash10 = "c6687e1fab97b2d7433a5e51fcf2aa30"

        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rifdoor"
        malpedia_rule_date = "20230118"
        malpedia_hash = ""
        malpedia_version = "20230118"
        malpedia_license = "DRL 1.1"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $pdb = "rifle.pdb" ascii

        $s1 = "MUTEX394039_4830023" ascii
        $s2 = "CMD:%s %s %d/%d/%d %d:%d:%d" ascii
	$s3 = "/c del /q \"%s\" >> NUL" ascii

        $chunk_1 = {80 32 ?? 41 80 39 ?? 8B D1 75} // xor operation

        
    condition:
        uint16(0) == 0x5A4D  and ($pdb  or  (2 of ($s*) and $chunk_1 ))

}