rule win_colibri_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.colibri."
        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.colibri"
        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 = { 8d8568f9ffff ff75e8 ff75e0 50 6a05 59 e8???????? }
            // n = 7, score = 100
            //   8d8568f9ffff         | lea                 eax, [ebp - 0x698]
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ff75e0               | push                dword ptr [ebp - 0x20]
            //   50                   | push                eax
            //   6a05                 | push                5
            //   59                   | pop                 ecx
            //   e8????????           |                     

        $sequence_1 = { 85c0 7557 a1???????? 8d0c4502000000 e8???????? 83ec10 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7557                 | jne                 0x59
            //   a1????????           |                     
            //   8d0c4502000000       | lea                 ecx, [eax*2 + 2]
            //   e8????????           |                     
            //   83ec10               | sub                 esp, 0x10

        $sequence_2 = { 8d45a4 50 33c0 50 50 6a08 50 }
            // n = 7, score = 100
            //   8d45a4               | lea                 eax, [ebp - 0x5c]
            //   50                   | push                eax
            //   33c0                 | xor                 eax, eax
            //   50                   | push                eax
            //   50                   | push                eax
            //   6a08                 | push                8
            //   50                   | push                eax

        $sequence_3 = { e8???????? 83c410 8d8590fdffff ff75f8 ff75fc 50 53 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8d8590fdffff         | lea                 eax, [ebp - 0x270]
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_4 = { c1e806 03c2 5f eb02 }
            // n = 4, score = 100
            //   c1e806               | shr                 eax, 6
            //   03c2                 | add                 eax, edx
            //   5f                   | pop                 edi
            //   eb02                 | jmp                 4

        $sequence_5 = { ffd0 33c9 50 41 e8???????? ba4d1cfed4 8bc8 }
            // n = 7, score = 100
            //   ffd0                 | call                eax
            //   33c9                 | xor                 ecx, ecx
            //   50                   | push                eax
            //   41                   | inc                 ecx
            //   e8????????           |                     
            //   ba4d1cfed4           | mov                 edx, 0xd4fe1c4d
            //   8bc8                 | mov                 ecx, eax

        $sequence_6 = { 8d8594fdffff 50 6a05 59 e8???????? ba083cf2e9 8bc8 }
            // n = 7, score = 100
            //   8d8594fdffff         | lea                 eax, [ebp - 0x26c]
            //   50                   | push                eax
            //   6a05                 | push                5
            //   59                   | pop                 ecx
            //   e8????????           |                     
            //   ba083cf2e9           | mov                 edx, 0xe9f23c08
            //   8bc8                 | mov                 ecx, eax

        $sequence_7 = { 81ff00010000 7cbc 8bfe 8b5df8 8975fc 397508 }
            // n = 6, score = 100
            //   81ff00010000         | cmp                 edi, 0x100
            //   7cbc                 | jl                  0xffffffbe
            //   8bfe                 | mov                 edi, esi
            //   8b5df8               | mov                 ebx, dword ptr [ebp - 8]
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   397508               | cmp                 dword ptr [ebp + 8], esi

        $sequence_8 = { 8d144502000000 e8???????? a1???????? 8bce 8d144502000000 e8???????? 5f }
            // n = 7, score = 100
            //   8d144502000000       | lea                 edx, [eax*2 + 2]
            //   e8????????           |                     
            //   a1????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   8d144502000000       | lea                 edx, [eax*2 + 2]
            //   e8????????           |                     
            //   5f                   | pop                 edi

        $sequence_9 = { 0f849b000000 53 8d85ecfdffff 50 }
            // n = 4, score = 100
            //   0f849b000000         | je                  0xa1
            //   53                   | push                ebx
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 51200
}

rule win_colibri_w0 {
    meta:
	description = "Detect_colibri_loader"
	author = "@malgamy12"
	date = "7/12/2022"
	license = "DRL 1.1"
        hash= "59f5e517dc05a83d35f11c6682934497"
        hash= "7615231dd8463c48f9dc66b67da68f49"
        hash= "7f697936757ced404c2a7515ccfe426b"
        hash= "85c3a80b85fceae0aba419b8b62ff831"
        hash= "f1bbf3a0c6c52953803e5804f4e37b15"
        hash= "7207e37226711374827d0f877b607b0f"
        hash= "7eb0b86bc4725d56c499939ab06212cf"
        hash= "21ec2cac8a3511f6a3d1ade20d5c1e38"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.colibri"
        malpedia_rule_date = "20230118"
        malpedia_hash = ""
        malpedia_version = "20230118"
        malpedia_license = "DRL 1.1"
        malpedia_sharing = "TLP:WHITE"    
    strings:
        $p1 = {0F B7 06 0F B7 4E ?? 03 D0 8B C2 83 C6 ?? C1 E0 ?? 33 C8 C1 E1 ?? 33 D1 8B C2 C1 E8 ?? 03 D0 83 EB}
        $p2 = {8B C2 C1 E0 ?? 33 D0 8B C2 C1 E8 ?? 03 D0 8B C2 C1 E0 ?? 33 D0 8B C2 C1 E8 ?? 03 D0 8B C2 C1 E0 ?? 33 D0 8B C2 C1 E8 ?? 03 C2}
        $p3 = {33 D2 8B C3 F7 75 ?? 66 8B 04 56 66 33 04 0F 43 66 89 01 8D 49 ?? 3B 5D}
        
    condition:
        uint16(0) == 0x5A4D and all of them
}