rule win_rifdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 8b1495605d4100 59 c1e006 59 8a4dff 80c901 }
            // n = 6, score = 200
            //   8b1495605d4100       | mov                 edx, dword ptr [edx*4 + 0x415d60]
            //   59                   | pop                 ecx
            //   c1e006               | shl                 eax, 6
            //   59                   | pop                 ecx
            //   8a4dff               | mov                 cl, byte ptr [ebp - 1]
            //   80c901               | or                  cl, 1

        $sequence_1 = { 50 b814000000 b9???????? e8???????? 8b4c2414 8be8 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   b814000000           | mov                 eax, 0x14
            //   b9????????           |                     
            //   e8????????           |                     
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   8be8                 | mov                 ebp, eax

        $sequence_2 = { ffd6 32c0 5e 5b 8b8c2474010000 }
            // n = 5, score = 200
            //   ffd6                 | call                esi
            //   32c0                 | xor                 al, al
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8b8c2474010000       | mov                 ecx, dword ptr [esp + 0x174]

        $sequence_3 = { 33c0 5b c3 8d5601 c6040200 8b4c2414 }
            // n = 6, score = 200
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   8d5601               | lea                 edx, [esi + 1]
            //   c6040200             | mov                 byte ptr [edx + eax], 0
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]

        $sequence_4 = { c744245044000000 c744247c01010000 ff15???????? 85c0 754b a1???????? }
            // n = 6, score = 200
            //   c744245044000000     | mov                 dword ptr [esp + 0x50], 0x44
            //   c744247c01010000     | mov                 dword ptr [esp + 0x7c], 0x101
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   754b                 | jne                 0x4d
            //   a1????????           |                     

        $sequence_5 = { 7560 66833e08 755a 8844242c 8944242d 89442431 89442435 }
            // n = 7, score = 200
            //   7560                 | jne                 0x62
            //   66833e08             | cmp                 word ptr [esi], 8
            //   755a                 | jne                 0x5c
            //   8844242c             | mov                 byte ptr [esp + 0x2c], al
            //   8944242d             | mov                 dword ptr [esp + 0x2d], eax
            //   89442431             | mov                 dword ptr [esp + 0x31], eax
            //   89442435             | mov                 dword ptr [esp + 0x35], eax

        $sequence_6 = { 83c404 33c0 c644240703 c644240602 }
            // n = 4, score = 200
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax
            //   c644240703           | mov                 byte ptr [esp + 7], 3
            //   c644240602           | mov                 byte ptr [esp + 6], 2

        $sequence_7 = { e8???????? 84c0 75c9 8b15???????? 52 ffd6 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   75c9                 | jne                 0xffffffcb
            //   8b15????????         |                     
            //   52                   | push                edx
            //   ffd6                 | call                esi

        $sequence_8 = { 56 8b35???????? 57 3b35???????? }
            // n = 4, score = 100
            //   56                   | push                esi
            //   8b35????????         |                     
            //   57                   | push                edi
            //   3b35????????         |                     

        $sequence_9 = { 56 89858cfdffff ff15???????? 56 ff15???????? }
            // n = 5, score = 100
            //   56                   | push                esi
            //   89858cfdffff         | mov                 dword ptr [ebp - 0x274], eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_10 = { 51 52 ff15???????? 85c0 7503 8d5801 8b4594 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7503                 | jne                 5
            //   8d5801               | lea                 ebx, [eax + 1]
            //   8b4594               | mov                 eax, dword ptr [ebp - 0x6c]

        $sequence_11 = { ffd6 68???????? 8d95e8fbffff 52 ffd3 8d85e8fbffff 50 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   8d95e8fbffff         | lea                 edx, [ebp - 0x418]
            //   52                   | push                edx
            //   ffd3                 | call                ebx
            //   8d85e8fbffff         | lea                 eax, [ebp - 0x418]
            //   50                   | push                eax

        $sequence_12 = { 8d85f9fbffff 53 50 899df0f7ffff 889df8fbffff }
            // n = 5, score = 100
            //   8d85f9fbffff         | lea                 eax, [ebp - 0x407]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   899df0f7ffff         | mov                 dword ptr [ebp - 0x810], ebx
            //   889df8fbffff         | mov                 byte ptr [ebp - 0x408], bl

        $sequence_13 = { 8d9530bdffff 52 8d8558bdffff 50 8d8d54bdffff 51 c78530bdffff0c000000 }
            // n = 7, score = 100
            //   8d9530bdffff         | lea                 edx, [ebp - 0x42d0]
            //   52                   | push                edx
            //   8d8558bdffff         | lea                 eax, [ebp - 0x42a8]
            //   50                   | push                eax
            //   8d8d54bdffff         | lea                 ecx, [ebp - 0x42ac]
            //   51                   | push                ecx
            //   c78530bdffff0c000000     | mov    dword ptr [ebp - 0x42d0], 0xc

        $sequence_14 = { 75f6 57 ff15???????? 8b5594 }
            // n = 4, score = 100
            //   75f6                 | jne                 0xfffffff8
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8b5594               | mov                 edx, dword ptr [ebp - 0x6c]

        $sequence_15 = { a3???????? eb2c 8b14b7 83c203 803a00 }
            // n = 5, score = 100
            //   a3????????           |                     
            //   eb2c                 | jmp                 0x2e
            //   8b14b7               | mov                 edx, dword ptr [edi + esi*4]
            //   83c203               | add                 edx, 3
            //   803a00               | cmp                 byte ptr [edx], 0

    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 ))

}