rule win_rifdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        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 = "20231130"
        malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
        malpedia_version = "20230808"
        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 = { e8???????? 8be5 5d c20400 6804010000 8d54240c }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   6804010000           | push                0x104
            //   8d54240c             | lea                 edx, [esp + 0xc]

        $sequence_1 = { 0f8484000000 391d???????? 747c 391d???????? 7474 391d???????? 746c }
            // n = 7, score = 200
            //   0f8484000000         | je                  0x8a
            //   391d????????         |                     
            //   747c                 | je                  0x7e
            //   391d????????         |                     
            //   7474                 | je                  0x76
            //   391d????????         |                     
            //   746c                 | je                  0x6e

        $sequence_2 = { ba4f000000 8bc2 668944243c b952000000 66894c2438 668954243a }
            // n = 6, score = 200
            //   ba4f000000           | mov                 edx, 0x4f
            //   8bc2                 | mov                 eax, edx
            //   668944243c           | mov                 word ptr [esp + 0x3c], ax
            //   b952000000           | mov                 ecx, 0x52
            //   66894c2438           | mov                 word ptr [esp + 0x38], cx
            //   668954243a           | mov                 word ptr [esp + 0x3a], dx

        $sequence_3 = { 83c408 85c0 7405 bf01000000 8d542410 52 ff15???????? }
            // n = 7, score = 200
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7
            //   bf01000000           | mov                 edi, 1
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_4 = { 830eff 2b34bd605d4100 c1fe06 8bc7 c1e005 }
            // n = 5, score = 200
            //   830eff               | or                  dword ptr [esi], 0xffffffff
            //   2b34bd605d4100       | sub                 esi, dword ptr [edi*4 + 0x415d60]
            //   c1fe06               | sar                 esi, 6
            //   8bc7                 | mov                 eax, edi
            //   c1e005               | shl                 eax, 5

        $sequence_5 = { b001 5e 81c408010000 c3 5f 32c0 }
            // n = 6, score = 200
            //   b001                 | mov                 al, 1
            //   5e                   | pop                 esi
            //   81c408010000         | add                 esp, 0x108
            //   c3                   | ret                 
            //   5f                   | pop                 edi
            //   32c0                 | xor                 al, al

        $sequence_6 = { 8d4c2454 51 8b4c2410 8d54242c e8???????? 83c408 85c0 }
            // n = 7, score = 200
            //   8d4c2454             | lea                 ecx, [esp + 0x54]
            //   51                   | push                ecx
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   8d54242c             | lea                 edx, [esp + 0x2c]
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_7 = { 83c408 a3???????? e9???????? 3c01 }
            // n = 4, score = 200
            //   83c408               | add                 esp, 8
            //   a3????????           |                     
            //   e9????????           |                     
            //   3c01                 | cmp                 al, 1

        $sequence_8 = { 53 56 8b35???????? 57 3b35???????? 7d4a }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b35????????         |                     
            //   57                   | push                edi
            //   3b35????????         |                     
            //   7d4a                 | jge                 0x4c

        $sequence_9 = { 50 8b410c ffd0 8b95f0f7ffff }
            // n = 4, score = 100
            //   50                   | push                eax
            //   8b410c               | mov                 eax, dword ptr [ecx + 0xc]
            //   ffd0                 | call                eax
            //   8b95f0f7ffff         | mov                 edx, dword ptr [ebp - 0x810]

        $sequence_10 = { e8???????? 8b1d???????? 33c0 83c40c 33d2 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b1d????????         |                     
            //   33c0                 | xor                 eax, eax
            //   83c40c               | add                 esp, 0xc
            //   33d2                 | xor                 edx, edx

        $sequence_11 = { 68ff000000 8d9524faffff 52 ff15???????? }
            // n = 4, score = 100
            //   68ff000000           | push                0xff
            //   8d9524faffff         | lea                 edx, [ebp - 0x5dc]
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_12 = { 75f9 8d8de8fbffff 2bc2 51 40 }
            // n = 5, score = 100
            //   75f9                 | jne                 0xfffffffb
            //   8d8de8fbffff         | lea                 ecx, [ebp - 0x418]
            //   2bc2                 | sub                 eax, edx
            //   51                   | push                ecx
            //   40                   | inc                 eax

        $sequence_13 = { c1ee08 0bd6 884101 03c2 8d1400 33d0 }
            // n = 6, score = 100
            //   c1ee08               | shr                 esi, 8
            //   0bd6                 | or                  edx, esi
            //   884101               | mov                 byte ptr [ecx + 1], al
            //   03c2                 | add                 eax, edx
            //   8d1400               | lea                 edx, [eax + eax]
            //   33d0                 | xor                 edx, eax

        $sequence_14 = { ff15???????? 68???????? 6a00 6801001f00 ff15???????? 5f 5e }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   68????????           |                     
            //   6a00                 | push                0
            //   6801001f00           | push                0x1f0001
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_15 = { 8d8424a8010000 50 53 ff15???????? 85c0 7507 53 }
            // n = 7, score = 100
            //   8d8424a8010000       | lea                 eax, [esp + 0x1a8]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7507                 | jne                 9
            //   53                   | push                ebx

    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 ))

}