rule win_colibri_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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???????? 8b0d???????? 8d144d02000000 8b4de0 e8???????? 5f 8bc6 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   8d144d02000000       | lea                 edx, [ecx*2 + 2]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   8bc6                 | mov                 eax, esi

        $sequence_1 = { c3 55 8bec 83ec0c 8bd1 c645fc00 57 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec0c               | sub                 esp, 0xc
            //   8bd1                 | mov                 edx, ecx
            //   c645fc00             | mov                 byte ptr [ebp - 4], 0
            //   57                   | push                edi

        $sequence_2 = { 8d8594fdffff 50 57 6a08 59 }
            // n = 5, score = 100
            //   8d8594fdffff         | lea                 eax, [ebp - 0x26c]
            //   50                   | push                eax
            //   57                   | push                edi
            //   6a08                 | push                8
            //   59                   | pop                 ecx

        $sequence_3 = { ffd0 8d8594fdffff 50 6a04 59 e8???????? ba8fe39437 }
            // n = 7, score = 100
            //   ffd0                 | call                eax
            //   8d8594fdffff         | lea                 eax, [ebp - 0x26c]
            //   50                   | push                eax
            //   6a04                 | push                4
            //   59                   | pop                 ecx
            //   e8????????           |                     
            //   ba8fe39437           | mov                 edx, 0x3794e38f

        $sequence_4 = { 8bec 51 51 8b4d08 8d45f8 8365fc00 }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   8365fc00             | and                 dword ptr [ebp - 4], 0

        $sequence_5 = { e8???????? ba6057d067 8bc8 e8???????? ffd0 c3 55 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   ba6057d067           | mov                 edx, 0x67d05760
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   ffd0                 | call                eax
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_6 = { ffd0 85c0 0f84ce000000 8d8588fbffff 50 ff75f4 8d8570f7ffff }
            // n = 7, score = 100
            //   ffd0                 | call                eax
            //   85c0                 | test                eax, eax
            //   0f84ce000000         | je                  0xd4
            //   8d8588fbffff         | lea                 eax, [ebp - 0x478]
            //   50                   | push                eax
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   8d8570f7ffff         | lea                 eax, [ebp - 0x890]

        $sequence_7 = { e8???????? ffd0 56 6a1c 8d85ecfdffff }
            // n = 5, score = 100
            //   e8????????           |                     
            //   ffd0                 | call                eax
            //   56                   | push                esi
            //   6a1c                 | push                0x1c
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]

        $sequence_8 = { 85c0 0f8514010000 a1???????? 8d0c4502000000 e8???????? 83ec10 8945f0 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f8514010000         | jne                 0x11a
            //   a1????????           |                     
            //   8d0c4502000000       | lea                 ecx, [eax*2 + 2]
            //   e8????????           |                     
            //   83ec10               | sub                 esp, 0x10
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax

        $sequence_9 = { 8d85e0fbffff 33f6 6804010000 50 }
            // n = 4, score = 100
            //   8d85e0fbffff         | lea                 eax, [ebp - 0x420]
            //   33f6                 | xor                 esi, esi
            //   6804010000           | push                0x104
            //   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
}