rule win_cosmicduke_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-01-05"
        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 = "20260105"
        malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79"
        malpedia_version = "20251219"
        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 = { 895df4 53 33f6 885dfb ff15???????? 85c0 0f8591000000 }
            // n = 7, score = 100
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   53                   | push                ebx
            //   33f6                 | xor                 esi, esi
            //   885dfb               | mov                 byte ptr [ebp - 5], bl
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8591000000         | jne                 0x97

        $sequence_1 = { eb0e 68???????? 8d85c0f9ffff 50 ffd3 68???????? 8d85d0fdffff }
            // n = 7, score = 100
            //   eb0e                 | jmp                 0x10
            //   68????????           |                     
            //   8d85c0f9ffff         | lea                 eax, [ebp - 0x640]
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   68????????           |                     
            //   8d85d0fdffff         | lea                 eax, [ebp - 0x230]

        $sequence_2 = { 68???????? 8d85f4fdffff 50 ff15???????? 8d85ecfbffff 50 }
            // n = 6, score = 100
            //   68????????           |                     
            //   8d85f4fdffff         | lea                 eax, [ebp - 0x20c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   50                   | push                eax

        $sequence_3 = { 7443 68???????? 8d842448020000 50 ffd6 85c0 7438 }
            // n = 7, score = 100
            //   7443                 | je                  0x45
            //   68????????           |                     
            //   8d842448020000       | lea                 eax, [esp + 0x248]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   7438                 | je                  0x3a

        $sequence_4 = { 68???????? 6a01 6a01 68???????? e8???????? ba01000080 8bc8 }
            // n = 7, score = 100
            //   68????????           |                     
            //   6a01                 | push                1
            //   6a01                 | push                1
            //   68????????           |                     
            //   e8????????           |                     
            //   ba01000080           | mov                 edx, 0x80000001
            //   8bc8                 | mov                 ecx, eax

        $sequence_5 = { 668b044510984200 8b4dfc 6689044e 33c0 ff4d0c 75d2 8b4dfc }
            // n = 7, score = 100
            //   668b044510984200     | mov                 ax, word ptr [eax*2 + 0x429810]
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   6689044e             | mov                 word ptr [esi + ecx*2], ax
            //   33c0                 | xor                 eax, eax
            //   ff4d0c               | dec                 dword ptr [ebp + 0xc]
            //   75d2                 | jne                 0xffffffd4
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_6 = { e8???????? 8b442450 8944240c 8d44240c 50 8bfe 8d442450 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b442450             | mov                 eax, dword ptr [esp + 0x50]
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   50                   | push                eax
            //   8bfe                 | mov                 edi, esi
            //   8d442450             | lea                 eax, [esp + 0x50]

        $sequence_7 = { 68???????? 50 6801000080 e8???????? e8???????? 3d09030000 7515 }
            // n = 7, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   6801000080           | push                0x80000001
            //   e8????????           |                     
            //   e8????????           |                     
            //   3d09030000           | cmp                 eax, 0x309
            //   7515                 | jne                 0x17

        $sequence_8 = { ff15???????? 83c410 6a00 ff742434 68???????? e8???????? c644245c00 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   83c410               | add                 esp, 0x10
            //   6a00                 | push                0
            //   ff742434             | push                dword ptr [esp + 0x34]
            //   68????????           |                     
            //   e8????????           |                     
            //   c644245c00           | mov                 byte ptr [esp + 0x5c], 0

        $sequence_9 = { 8d442424 50 8b442424 68???????? 57 895c2448 }
            // n = 6, score = 100
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   50                   | push                eax
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   68????????           |                     
            //   57                   | push                edi
            //   895c2448             | mov                 dword ptr [esp + 0x48], ebx

    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 ))
}