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rule win_banjori_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.banjori." 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.banjori" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 7369 27 206964 3d27257327 206d69 6d 652d74797065 } // n = 7, score = 100 // 7369 | jae 0x6b // 27 | daa // 206964 | and byte ptr [ecx + 0x64], ch // 3d27257327 | cmp eax, 0x27732527 // 206d69 | and byte ptr [ebp + 0x69], ch // 6d | insd dword ptr es:[edi], dx // 652d74797065 | sub eax, 0x65707974 $sequence_1 = { 33c0 8b4df8 8ac5 50 ff15???????? 6880000000 6a40 } // n = 7, score = 100 // 33c0 | xor eax, eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8ac5 | mov al, ch // 50 | push eax // ff15???????? | // 6880000000 | push 0x80 // 6a40 | push 0x40 $sequence_2 = { ff15???????? ff75f0 ff15???????? 6803800000 50 ff75f0 e8???????? } // n = 7, score = 100 // ff15???????? | // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | // 6803800000 | push 0x8003 // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | $sequence_3 = { ff15???????? ebe1 e8???????? a1???????? e9???????? 55 8bec } // n = 7, score = 100 // ff15???????? | // ebe1 | jmp 0xffffffe3 // e8???????? | // a1???????? | // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp $sequence_4 = { ff75fc 53 53 53 ff75d8 68???????? } // n = 6, score = 100 // ff75fc | push dword ptr [ebp - 4] // 53 | push ebx // 53 | push ebx // 53 | push ebx // ff75d8 | push dword ptr [ebp - 0x28] // 68???????? | $sequence_5 = { ff75f8 57 ff15???????? ff75f8 e8???????? 8bc7 5f } // n = 7, score = 100 // ff75f8 | push dword ptr [ebp - 8] // 57 | push edi // ff15???????? | // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8bc7 | mov eax, edi // 5f | pop edi $sequence_6 = { 8d3dac169500 57 ff15???????? 40 50 57 6a01 } // n = 7, score = 100 // 8d3dac169500 | lea edi, [0x9516ac] // 57 | push edi // ff15???????? | // 40 | inc eax // 50 | push eax // 57 | push edi // 6a01 | push 1 $sequence_7 = { 8945e0 0500020000 8945dc 0500020000 8945d4 0500040000 } // n = 6, score = 100 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 0500020000 | add eax, 0x200 // 8945dc | mov dword ptr [ebp - 0x24], eax // 0500020000 | add eax, 0x200 // 8945d4 | mov dword ptr [ebp - 0x2c], eax // 0500040000 | add eax, 0x400 $sequence_8 = { c1e010 0bc1 8b550c 3902 7506 8b4508 894204 } // n = 7, score = 100 // c1e010 | shl eax, 0x10 // 0bc1 | or eax, ecx // 8b550c | mov edx, dword ptr [ebp + 0xc] // 3902 | cmp dword ptr [edx], eax // 7506 | jne 8 // 8b4508 | mov eax, dword ptr [ebp + 8] // 894204 | mov dword ptr [edx + 4], eax $sequence_9 = { 53 50 68???????? ff75c8 ff15???????? ff75c8 ff15???????? } // n = 7, score = 100 // 53 | push ebx // 50 | push eax // 68???????? | // ff75c8 | push dword ptr [ebp - 0x38] // ff15???????? | // ff75c8 | push dword ptr [ebp - 0x38] // ff15???????? | condition: 7 of them and filesize < 139264 }
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