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rule win_mebromi_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mebromi." 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.mebromi" 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 = { c20c00 ff05???????? 833d????????01 55 56 } // n = 5, score = 100 // c20c00 | ret 0xc // ff05???????? | // 833d????????01 | // 55 | push ebp // 56 | push esi $sequence_1 = { ff15???????? 8bf0 85f6 741c 8d45e4 57 } // n = 6, score = 100 // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 741c | je 0x1e // 8d45e4 | lea eax, [ebp - 0x1c] // 57 | push edi $sequence_2 = { f3ab c1e604 aa 8d9e88722900 } // n = 4, score = 100 // f3ab | rep stosd dword ptr es:[edi], eax // c1e604 | shl esi, 4 // aa | stosb byte ptr es:[edi], al // 8d9e88722900 | lea ebx, [esi + 0x297288] $sequence_3 = { 8d05549d2900 83780800 753b b0ff 8bff 0ac0 } // n = 6, score = 100 // 8d05549d2900 | lea eax, [0x299d54] // 83780800 | cmp dword ptr [eax + 8], 0 // 753b | jne 0x3d // b0ff | mov al, 0xff // 8bff | mov edi, edi // 0ac0 | or al, al $sequence_4 = { 5c 2b29 00802b290023 d18a0688078a } // n = 4, score = 100 // 5c | pop esp // 2b29 | sub ebp, dword ptr [ecx] // 00802b290023 | add byte ptr [eax + 0x2300292b], al // d18a0688078a | ror dword ptr [edx - 0x75f877fa], 1 $sequence_5 = { 0fb6d2 3bc2 0f8794000000 808801a0290004 40 ebee } // n = 6, score = 100 // 0fb6d2 | movzx edx, dl // 3bc2 | cmp eax, edx // 0f8794000000 | ja 0x9a // 808801a0290004 | or byte ptr [eax + 0x29a001], 4 // 40 | inc eax // ebee | jmp 0xfffffff0 $sequence_6 = { 683f000f00 6a00 6a00 ff15???????? 8bf0 56 } // n = 6, score = 100 // 683f000f00 | push 0xf003f // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 8bf0 | mov esi, eax // 56 | push esi $sequence_7 = { 85f6 7419 0fb6da f68301a0290004 7406 8816 } // n = 6, score = 100 // 85f6 | test esi, esi // 7419 | je 0x1b // 0fb6da | movzx ebx, dl // f68301a0290004 | test byte ptr [ebx + 0x29a001], 4 // 7406 | je 8 // 8816 | mov byte ptr [esi], dl $sequence_8 = { 83f908 7229 f3a5 ff2495082c2900 8bc7 ba03000000 } // n = 6, score = 100 // 83f908 | cmp ecx, 8 // 7229 | jb 0x2b // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff2495082c2900 | jmp dword ptr [edx*4 + 0x292c08] // 8bc7 | mov eax, edi // ba03000000 | mov edx, 3 $sequence_9 = { 8bd8 56 ffd7 3bdd 5b 7504 } // n = 6, score = 100 // 8bd8 | mov ebx, eax // 56 | push esi // ffd7 | call edi // 3bdd | cmp ebx, ebp // 5b | pop ebx // 7504 | jne 6 condition: 7 of them and filesize < 106496 }
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