rule win_cosmicduke_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.cosmicduke."
        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.cosmicduke"
        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 = { 53 56 57 8d442444 50 ff15???????? }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_1 = { 50 ffd7 53 8d84246c040000 50 ffd6 68???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   53                   | push                ebx
            //   8d84246c040000       | lea                 eax, [esp + 0x46c]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   68????????           |                     

        $sequence_2 = { e8???????? 3ac3 742a 53 ff15???????? ff742410 6a08 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   3ac3                 | cmp                 al, bl
            //   742a                 | je                  0x2c
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   ff742410             | push                dword ptr [esp + 0x10]
            //   6a08                 | push                8

        $sequence_3 = { 50 6a04 58 b9???????? 8975e8 e8???????? 33f6 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a04                 | push                4
            //   58                   | pop                 eax
            //   b9????????           |                     
            //   8975e8               | mov                 dword ptr [ebp - 0x18], esi
            //   e8????????           |                     
            //   33f6                 | xor                 esi, esi

        $sequence_4 = { 8d95b0ebffff 8bce e8???????? 5f b001 5e c9 }
            // n = 7, score = 100
            //   8d95b0ebffff         | lea                 edx, [ebp - 0x1450]
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   b001                 | mov                 al, 1
            //   5e                   | pop                 esi
            //   c9                   | leave               

        $sequence_5 = { 68???????? ff15???????? 8b16 8915???????? 8b7e04 893d???????? 8b06 }
            // n = 7, score = 100
            //   68????????           |                     
            //   ff15????????         |                     
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   8915????????         |                     
            //   8b7e04               | mov                 edi, dword ptr [esi + 4]
            //   893d????????         |                     
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_6 = { 668b4710 668945e5 668b4716 bf???????? 57 668945e9 ff15???????? }
            // n = 7, score = 100
            //   668b4710             | mov                 ax, word ptr [edi + 0x10]
            //   668945e5             | mov                 word ptr [ebp - 0x1b], ax
            //   668b4716             | mov                 ax, word ptr [edi + 0x16]
            //   bf????????           |                     
            //   57                   | push                edi
            //   668945e9             | mov                 word ptr [ebp - 0x17], ax
            //   ff15????????         |                     

        $sequence_7 = { 7cd6 0fb645ff 50 8d45d8 68???????? 50 ffd3 }
            // n = 7, score = 100
            //   7cd6                 | jl                  0xffffffd8
            //   0fb645ff             | movzx               eax, byte ptr [ebp - 1]
            //   50                   | push                eax
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd3                 | call                ebx

        $sequence_8 = { ff750c ff15???????? eb37 6a08 59 6a29 ff7508 }
            // n = 7, score = 100
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff15????????         |                     
            //   eb37                 | jmp                 0x39
            //   6a08                 | push                8
            //   59                   | pop                 ecx
            //   6a29                 | push                0x29
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_9 = { 6a08 ff35???????? ff15???????? 3bc6 7499 8bf0 85f6 }
            // n = 7, score = 100
            //   6a08                 | push                8
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   3bc6                 | cmp                 eax, esi
            //   7499                 | je                  0xffffff9b
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi

    condition:
        7 of them and filesize < 456704
}

rule win_cosmicduke_w0 {
	meta:
	    description = "detect cosmicduke"
	    author = "@malgamy12"
        date = "2022-11-6"
	    license = "DRL 1.1"
	    hash_sample1 = "93054d3abc36019ccfe88f87363363e6ca9b77f4"
        hash_sample2 = "0eadbd6ef9f5930257530ac5a3b8abb49c9755d1"
        hash_sample3 = "69c2d292179dc615bfe4d7f880b5f9928604558e"
        hash_sample4 = "616306489de4029da7271eadbdf090cee22ae1af"
        hash_sample5 = "ecb8edfddd812a125b515dc42a2e93569c1caed9"
        hash_sample6 = "a86f3faf1eedb7325023616adf37a62c9129c24e"
        hash_sample7 = "4d22b2d85b75ccf651f0ba85808482660a440bff"
        hash_sample8 = "3463df6b33b26c1249207f6e004c0bbc31b31152"
        hash_sample9 = "ca4c53eb86d5b920b321de573e212e31405707d5"
        hash_sample10 = "a48e4dd017618ae2d46a753345594a5f57fbe869"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cosmicduke"
        malpedia_rule_date = "20230118"
        malpedia_hash = ""
        malpedia_version = "20230118"
        malpedia_license = "DRL 1.1"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $pdb = "5\\bin\\bot.pdb" ascii

        $s1 = "pipe\\40DC244D-F62E-093E-8A91-736FF2FA2AA2" wide
        $s2 = "LoginName" ascii	
        $s3 = "select id, hostname, usernamefield, passwordfield, encryptedusern" wide
        $s4 = "*temporary;*Cookies;*games;*system32;*program files;*\\windows\\;*\\System Volume Information" wide
        $s5 = "msicheck.cmd" ascii
        $s6 = "AppData\\Roaming\\Miranda"  wide 
        $s7 = "Local Settings\\Application Data" wide
	
	/*
	imul    ebx, esi
        imul    esi, 0BC8Fh
        mov     eax, edx
        and     eax, 3
        lea     eax, [ebp+eax*4+var_3C]
        xor     [eax], ebx
        inc     edx
        dec     [ebp+var_8]
	*/

        $chunk_1 = {0F AF DE 69 F6 ?? ?? ?? ?? 8B C2 83 E0 ?? 8D 44 85 ?? 31 18 42 FF 4D ??}   

    condition:
        uint16(0) == 0x5A4D and filesize > 70KB and ($pdb  or  (4 of ($s*) and $chunk_1 ))
}