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 = "2023-01-25" 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 = "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 = { 85c0 0f84e4000000 e8???????? 85c0 0f85d7000000 8d85e4fbffff 50 } // n = 7, score = 200 // 85c0 | test eax, eax // 0f84e4000000 | je 0xea // e8???????? | // 85c0 | test eax, eax // 0f85d7000000 | jne 0xdd // 8d85e4fbffff | lea eax, [ebp - 0x41c] // 50 | push eax $sequence_1 = { 0385f4edffff 83c440 6a00 50 53 } // n = 5, score = 200 // 0385f4edffff | add eax, dword ptr [ebp - 0x120c] // 83c440 | add esp, 0x40 // 6a00 | push 0 // 50 | push eax // 53 | push ebx $sequence_2 = { 50 8d85c8f3ffff 50 ffd3 68???????? 8d85c8f3ffff 50 } // n = 7, score = 200 // 50 | push eax // 8d85c8f3ffff | lea eax, [ebp - 0xc38] // 50 | push eax // ffd3 | call ebx // 68???????? | // 8d85c8f3ffff | lea eax, [ebp - 0xc38] // 50 | push eax $sequence_3 = { 8d8598feffff 50 8d45b8 50 57 6a1a } // n = 6, score = 200 // 8d8598feffff | lea eax, [ebp - 0x168] // 50 | push eax // 8d45b8 | lea eax, [ebp - 0x48] // 50 | push eax // 57 | push edi // 6a1a | push 0x1a $sequence_4 = { 56 56 56 53 ff15???????? 56 8d85dcfbffff } // n = 7, score = 200 // 56 | push esi // 56 | push esi // 56 | push esi // 53 | push ebx // ff15???????? | // 56 | push esi // 8d85dcfbffff | lea eax, [ebp - 0x424] $sequence_5 = { 50 ff55f4 85c0 754d 395df8 } // n = 5, score = 200 // 50 | push eax // ff55f4 | call dword ptr [ebp - 0xc] // 85c0 | test eax, eax // 754d | jne 0x4f // 395df8 | cmp dword ptr [ebp - 8], ebx $sequence_6 = { 85f6 7417 57 ff750c 56 } // n = 5, score = 200 // 85f6 | test esi, esi // 7417 | je 0x19 // 57 | push edi // ff750c | push dword ptr [ebp + 0xc] // 56 | push esi $sequence_7 = { 3bde 0f844dffffff 56 57 ffb5e0fbffff 53 } // n = 6, score = 200 // 3bde | cmp ebx, esi // 0f844dffffff | je 0xffffff53 // 56 | push esi // 57 | push edi // ffb5e0fbffff | push dword ptr [ebp - 0x420] // 53 | push ebx $sequence_8 = { 52 ff15???????? 83f8ff 894508 0f84be010000 } // n = 5, score = 100 // 52 | push edx // ff15???????? | // 83f8ff | cmp eax, -1 // 894508 | mov dword ptr [ebp + 8], eax // 0f84be010000 | je 0x1c4 $sequence_9 = { c1f905 8b0c8d00644100 f644c10401 8d04c1 } // n = 4, score = 100 // c1f905 | sar ecx, 5 // 8b0c8d00644100 | mov ecx, dword ptr [ecx*4 + 0x416400] // f644c10401 | test byte ptr [ecx + eax*8 + 4], 1 // 8d04c1 | lea eax, [ecx + eax*8] $sequence_10 = { 5d 5d 9d 5d 6a00 6a02 ff15???????? } // n = 7, score = 100 // 5d | pop ebp // 5d | pop ebp // 9d | popfd // 5d | pop ebp // 6a00 | push 0 // 6a02 | push 2 // ff15???????? | $sequence_11 = { 668b0d???????? 53 56 8955e0 57 8945e4 } // n = 6, score = 100 // 668b0d???????? | // 53 | push ebx // 56 | push esi // 8955e0 | mov dword ptr [ebp - 0x20], edx // 57 | push edi // 8945e4 | mov dword ptr [ebp - 0x1c], eax $sequence_12 = { 81e2ffff0000 83c241 8955fc 50 50 9c b80a000000 } // n = 7, score = 100 // 81e2ffff0000 | and edx, 0xffff // 83c241 | add edx, 0x41 // 8955fc | mov dword ptr [ebp - 4], edx // 50 | push eax // 50 | push eax // 9c | pushfd // b80a000000 | mov eax, 0xa $sequence_13 = { 51 52 ff15???????? 85c0 0f85f2000000 ff15???????? } // n = 6, score = 100 // 51 | push ecx // 52 | push edx // ff15???????? | // 85c0 | test eax, eax // 0f85f2000000 | jne 0xf8 // ff15???????? | $sequence_14 = { 6818b73cb3 56 e8???????? 68a6c0d527 56 a3???????? e8???????? } // n = 7, score = 100 // 6818b73cb3 | push 0xb33cb718 // 56 | push esi // e8???????? | // 68a6c0d527 | push 0x27d5c0a6 // 56 | push esi // a3???????? | // e8???????? | $sequence_15 = { 6aff 52 6a00 68e9fd0000 ff15???????? 8b55f8 68???????? } // n = 7, score = 100 // 6aff | push -1 // 52 | push edx // 6a00 | push 0 // 68e9fd0000 | push 0xfde9 // ff15???????? | // 8b55f8 | mov edx, dword ptr [ebp - 8] // 68???????? | condition: 7 of them and filesize < 188416 }
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