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rule win_http_troy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.http_troy." 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.http_troy" 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 = { 8d4c2434 51 56 8844243c ffd7 8a5307 6a01 } // n = 7, score = 200 // 8d4c2434 | lea ecx, [esp + 0x34] // 51 | push ecx // 56 | push esi // 8844243c | mov byte ptr [esp + 0x3c], al // ffd7 | call edi // 8a5307 | mov dl, byte ptr [ebx + 7] // 6a01 | push 1 $sequence_1 = { 8b7508 8d442408 8d5001 90 8a08 40 } // n = 6, score = 200 // 8b7508 | mov esi, dword ptr [ebp + 8] // 8d442408 | lea eax, [esp + 8] // 8d5001 | lea edx, [eax + 1] // 90 | nop // 8a08 | mov cl, byte ptr [eax] // 40 | inc eax $sequence_2 = { 6a00 56 ff15???????? 85c0 7535 8b4c2410 } // n = 6, score = 200 // 6a00 | push 0 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 7535 | jne 0x37 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] $sequence_3 = { 56 57 8b7c2410 6a00 6880000000 6a03 6a00 } // n = 7, score = 200 // 56 | push esi // 57 | push edi // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // 6a00 | push 0 // 6880000000 | push 0x80 // 6a03 | push 3 // 6a00 | push 0 $sequence_4 = { 8d4411ff 3dff7f0000 740a c786a4af0600d4a70210 8b5c243c 33f6 85db } // n = 7, score = 200 // 8d4411ff | lea eax, [ecx + edx - 1] // 3dff7f0000 | cmp eax, 0x7fff // 740a | je 0xc // c786a4af0600d4a70210 | mov dword ptr [esi + 0x6afa4], 0x1002a7d4 // 8b5c243c | mov ebx, dword ptr [esp + 0x3c] // 33f6 | xor esi, esi // 85db | test ebx, ebx $sequence_5 = { 03763c 56 ff15???????? 85c0 741a 55 ff15???????? } // n = 7, score = 200 // 03763c | add esi, dword ptr [esi + 0x3c] // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 741a | je 0x1c // 55 | push ebp // ff15???????? | $sequence_6 = { 8d442404 33ff 50 57 897c240c e8???????? 83f86f } // n = 7, score = 200 // 8d442404 | lea eax, [esp + 4] // 33ff | xor edi, edi // 50 | push eax // 57 | push edi // 897c240c | mov dword ptr [esp + 0xc], edi // e8???????? | // 83f86f | cmp eax, 0x6f $sequence_7 = { 834dfcff 8345e404 ebd5 e8???????? c3 8b0d???????? 8bc2 } // n = 7, score = 200 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8345e404 | add dword ptr [ebp - 0x1c], 4 // ebd5 | jmp 0xffffffd7 // e8???????? | // c3 | ret // 8b0d???????? | // 8bc2 | mov eax, edx $sequence_8 = { 50 6a00 8d4c2418 51 6a00 56 e8???????? } // n = 7, score = 200 // 50 | push eax // 6a00 | push 0 // 8d4c2418 | lea ecx, [esp + 0x18] // 51 | push ecx // 6a00 | push 0 // 56 | push esi // e8???????? | $sequence_9 = { 899e6caf0600 33c0 83fa02 b9ff7f0000 8dbe70af0400 f3ab } // n = 6, score = 200 // 899e6caf0600 | mov dword ptr [esi + 0x6af6c], ebx // 33c0 | xor eax, eax // 83fa02 | cmp edx, 2 // b9ff7f0000 | mov ecx, 0x7fff // 8dbe70af0400 | lea edi, [esi + 0x4af70] // f3ab | rep stosd dword ptr es:[edi], eax condition: 7 of them and filesize < 475136 }
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