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rule win_mailto_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.mailto" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8d4c2440 51 6a0f 8b4074 53 ffd0 8b7c2440 } // n = 7, score = 400 // 8d4c2440 | lea ecx, [esp + 0x40] // 51 | push ecx // 6a0f | push 0xf // 8b4074 | mov eax, dword ptr [eax + 0x74] // 53 | push ebx // ffd0 | call eax // 8b7c2440 | mov edi, dword ptr [esp + 0x40] $sequence_1 = { 747a 8bf2 89542414 89542410 } // n = 4, score = 400 // 747a | je 0x7c // 8bf2 | mov esi, edx // 89542414 | mov dword ptr [esp + 0x14], edx // 89542410 | mov dword ptr [esp + 0x10], edx $sequence_2 = { 57 33ff 85f6 0f843e010000 8b5c2414 } // n = 5, score = 400 // 57 | push edi // 33ff | xor edi, edi // 85f6 | test esi, esi // 0f843e010000 | je 0x144 // 8b5c2414 | mov ebx, dword ptr [esp + 0x14] $sequence_3 = { 0f84d0000000 c60009 e8???????? 8d4c2414 51 8b407c ffd0 } // n = 7, score = 400 // 0f84d0000000 | je 0xd6 // c60009 | mov byte ptr [eax], 9 // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // 51 | push ecx // 8b407c | mov eax, dword ptr [eax + 0x7c] // ffd0 | call eax $sequence_4 = { 83c408 3b7b10 72e5 8b4314 } // n = 4, score = 400 // 83c408 | add esp, 8 // 3b7b10 | cmp edi, dword ptr [ebx + 0x10] // 72e5 | jb 0xffffffe7 // 8b4314 | mov eax, dword ptr [ebx + 0x14] $sequence_5 = { e8???????? 83c40c 85c0 741a 8b4f14 56 51 } // n = 7, score = 400 // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 741a | je 0x1c // 8b4f14 | mov ecx, dword ptr [edi + 0x14] // 56 | push esi // 51 | push ecx $sequence_6 = { 57 6a20 e8???????? 8bf8 83c404 85ff 7429 } // n = 7, score = 400 // 57 | push edi // 6a20 | push 0x20 // e8???????? | // 8bf8 | mov edi, eax // 83c404 | add esp, 4 // 85ff | test edi, edi // 7429 | je 0x2b $sequence_7 = { 7508 84c0 0f8491000000 57 56 e8???????? 83c408 } // n = 7, score = 400 // 7508 | jne 0xa // 84c0 | test al, al // 0f8491000000 | je 0x97 // 57 | push edi // 56 | push esi // e8???????? | // 83c408 | add esp, 8 $sequence_8 = { 88461a 8bc3 c1f810 884e16 8bcd 88461b 8bc1 } // n = 7, score = 400 // 88461a | mov byte ptr [esi + 0x1a], al // 8bc3 | mov eax, ebx // c1f810 | sar eax, 0x10 // 884e16 | mov byte ptr [esi + 0x16], cl // 8bcd | mov ecx, ebp // 88461b | mov byte ptr [esi + 0x1b], al // 8bc1 | mov eax, ecx $sequence_9 = { 8bc7 2bf7 b902000000 8d4010 0f104406f0 660fefc1 0f1140f0 } // n = 7, score = 400 // 8bc7 | mov eax, edi // 2bf7 | sub esi, edi // b902000000 | mov ecx, 2 // 8d4010 | lea eax, [eax + 0x10] // 0f104406f0 | movups xmm0, xmmword ptr [esi + eax - 0x10] // 660fefc1 | pxor xmm0, xmm1 // 0f1140f0 | movups xmmword ptr [eax - 0x10], xmm0 condition: 7 of them and filesize < 180224 }
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