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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 }
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