Actor(s): Wekby, EMISSARY PANDA
There is no description at this point.
rule win_httpbrowser_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.httpbrowser." 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.httpbrowser" 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 = { 8d8de8fdffff 51 c785ecfdffff00010000 89bdf0fdffff ffd0 } // n = 5, score = 200 // 8d8de8fdffff | lea ecx, [ebp - 0x218] // 51 | push ecx // c785ecfdffff00010000 | mov dword ptr [ebp - 0x214], 0x100 // 89bdf0fdffff | mov dword ptr [ebp - 0x210], edi // ffd0 | call eax $sequence_1 = { 56 53 ff15???????? 3bc7 7415 33ff } // n = 6, score = 200 // 56 | push esi // 53 | push ebx // ff15???????? | // 3bc7 | cmp eax, edi // 7415 | je 0x17 // 33ff | xor edi, edi $sequence_2 = { 83c40c 33c0 56 66898578fbffff } // n = 4, score = 200 // 83c40c | add esp, 0xc // 33c0 | xor eax, eax // 56 | push esi // 66898578fbffff | mov word ptr [ebp - 0x488], ax $sequence_3 = { 3bfe 7e0d 56 ffb5f4fdffff ff15???????? ffb5f4fdffff ff15???????? } // n = 7, score = 200 // 3bfe | cmp edi, esi // 7e0d | jle 0xf // 56 | push esi // ffb5f4fdffff | push dword ptr [ebp - 0x20c] // ff15???????? | // ffb5f4fdffff | push dword ptr [ebp - 0x20c] // ff15???????? | $sequence_4 = { 50 89b598fdffff e8???????? 33c0 89b5e4fdffff } // n = 5, score = 200 // 50 | push eax // 89b598fdffff | mov dword ptr [ebp - 0x268], esi // e8???????? | // 33c0 | xor eax, eax // 89b5e4fdffff | mov dword ptr [ebp - 0x21c], esi $sequence_5 = { 48 48 0f841e030000 83e80d 0f8428030000 2df0000000 741d } // n = 7, score = 200 // 48 | dec eax // 48 | dec eax // 0f841e030000 | je 0x324 // 83e80d | sub eax, 0xd // 0f8428030000 | je 0x32e // 2df0000000 | sub eax, 0xf0 // 741d | je 0x1f $sequence_6 = { ffb5c4fcffff ff95b8fcffff 3b85bcfcffff 0f857f020000 833e01 } // n = 5, score = 200 // ffb5c4fcffff | push dword ptr [ebp - 0x33c] // ff95b8fcffff | call dword ptr [ebp - 0x348] // 3b85bcfcffff | cmp eax, dword ptr [ebp - 0x344] // 0f857f020000 | jne 0x285 // 833e01 | cmp dword ptr [esi], 1 $sequence_7 = { 50 8d85c855ffff 50 ffd6 68???????? } // n = 5, score = 200 // 50 | push eax // 8d85c855ffff | lea eax, [ebp - 0xaa38] // 50 | push eax // ffd6 | call esi // 68???????? | $sequence_8 = { 8bde c1fa05 83e31f 8b149500644100 f644da0480 7428 8bd1 } // n = 7, score = 100 // 8bde | mov ebx, esi // c1fa05 | sar edx, 5 // 83e31f | and ebx, 0x1f // 8b149500644100 | mov edx, dword ptr [edx*4 + 0x416400] // f644da0480 | test byte ptr [edx + ebx*8 + 4], 0x80 // 7428 | je 0x2a // 8bd1 | mov edx, ecx $sequence_9 = { 56 b8???????? 7415 8d3449 8d34b5f8254100 } // n = 5, score = 100 // 56 | push esi // b8???????? | // 7415 | je 0x17 // 8d3449 | lea esi, [ecx + ecx*2] // 8d34b5f8254100 | lea esi, [esi*4 + 0x4125f8] $sequence_10 = { 85c0 0f849c040000 8b4df8 8d45fc 50 } // n = 5, score = 100 // 85c0 | test eax, eax // 0f849c040000 | je 0x4a2 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8d45fc | lea eax, [ebp - 4] // 50 | push eax $sequence_11 = { 56 a3???????? e8???????? 68ca13d31c 56 } // n = 5, score = 100 // 56 | push esi // a3???????? | // e8???????? | // 68ca13d31c | push 0x1cd313ca // 56 | push esi $sequence_12 = { c7420400000000 50 55 8bec 9c 6841061504 } // n = 6, score = 100 // c7420400000000 | mov dword ptr [edx + 4], 0 // 50 | push eax // 55 | push ebp // 8bec | mov ebp, esp // 9c | pushfd // 6841061504 | push 0x4150641 $sequence_13 = { 66899514fdffff f3ab 66ab 8d8514fdffff 682c010000 50 } // n = 6, score = 100 // 66899514fdffff | mov word ptr [ebp - 0x2ec], dx // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // 8d8514fdffff | lea eax, [ebp - 0x2ec] // 682c010000 | push 0x12c // 50 | push eax $sequence_14 = { 745c 8bce 33c0 8bfa c1e902 f3ab } // n = 6, score = 100 // 745c | je 0x5e // 8bce | mov ecx, esi // 33c0 | xor eax, eax // 8bfa | mov edi, edx // c1e902 | shr ecx, 2 // f3ab | rep stosd dword ptr es:[edi], eax $sequence_15 = { 760a c705????????16000000 c3 8b442404 3b05???????? 7203 33c0 } // n = 7, score = 100 // 760a | jbe 0xc // c705????????16000000 | // c3 | ret // 8b442404 | mov eax, dword ptr [esp + 4] // 3b05???????? | // 7203 | jb 5 // 33c0 | xor eax, eax condition: 7 of them and filesize < 188416 }
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