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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 50 ff7508 6a00 53 ffd6 8b45fc 33c9 } // n = 7, score = 200 // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // 6a00 | push 0 // 53 | push ebx // ffd6 | call esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 33c9 | xor ecx, ecx $sequence_1 = { 50 895de0 ff5604 8945f0 85db 0f8489010000 } // n = 6, score = 200 // 50 | push eax // 895de0 | mov dword ptr [ebp - 0x20], ebx // ff5604 | call dword ptr [esi + 4] // 8945f0 | mov dword ptr [ebp - 0x10], eax // 85db | test ebx, ebx // 0f8489010000 | je 0x18f $sequence_2 = { 33c5 8945fc 53 56 57 8d859cfeffff 33ff } // n = 7, score = 200 // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 56 | push esi // 57 | push edi // 8d859cfeffff | lea eax, [ebp - 0x164] // 33ff | xor edi, edi $sequence_3 = { 8d85f0fdffff 50 8d85d0f5ffff 50 ff15???????? } // n = 5, score = 200 // 8d85f0fdffff | lea eax, [ebp - 0x210] // 50 | push eax // 8d85d0f5ffff | lea eax, [ebp - 0xa30] // 50 | push eax // ff15???????? | $sequence_4 = { 56 6a03 6800000040 8d85f4fdffff 50 ff15???????? } // n = 6, score = 200 // 56 | push esi // 6a03 | push 3 // 6800000040 | push 0x40000000 // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax // ff15???????? | $sequence_5 = { e8???????? 83c40c 33c0 56 668985c8f3ffff 8d85caf3ffff } // n = 6, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 33c0 | xor eax, eax // 56 | push esi // 668985c8f3ffff | mov word ptr [ebp - 0xc38], ax // 8d85caf3ffff | lea eax, [ebp - 0xc36] $sequence_6 = { 83c438 ff15???????? 8d85f4fdffff 50 53 57 } // n = 6, score = 200 // 83c438 | add esp, 0x38 // ff15???????? | // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax // 53 | push ebx // 57 | push edi $sequence_7 = { ffb5f4edffff 8d85fcfdffff ffb5f8edffff 68???????? 50 } // n = 5, score = 200 // ffb5f4edffff | push dword ptr [ebp - 0x120c] // 8d85fcfdffff | lea eax, [ebp - 0x204] // ffb5f8edffff | push dword ptr [ebp - 0x1208] // 68???????? | // 50 | push eax $sequence_8 = { e8???????? 68c20ddf13 56 a3???????? e8???????? 83c438 } // n = 6, score = 100 // e8???????? | // 68c20ddf13 | push 0x13df0dc2 // 56 | push esi // a3???????? | // e8???????? | // 83c438 | add esp, 0x38 $sequence_9 = { 6a00 6810040000 ff15???????? 8bf0 57 6a0e 56 } // n = 7, score = 100 // 6a00 | push 0 // 6810040000 | push 0x410 // ff15???????? | // 8bf0 | mov esi, eax // 57 | push edi // 6a0e | push 0xe // 56 | push esi $sequence_10 = { 83c414 c745ec00000000 68???????? 50 9c b80a000000 51 } // n = 7, score = 100 // 83c414 | add esp, 0x14 // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // 68???????? | // 50 | push eax // 9c | pushfd // b80a000000 | mov eax, 0xa // 51 | push ecx $sequence_11 = { b905000000 8db524ffffff 8dbda4feffff 8945e4 } // n = 4, score = 100 // b905000000 | mov ecx, 5 // 8db524ffffff | lea esi, [ebp - 0xdc] // 8dbda4feffff | lea edi, [ebp - 0x15c] // 8945e4 | mov dword ptr [ebp - 0x1c], eax $sequence_12 = { 33c0 8dbd26ffffff 66899524ffffff f3ab 8955e8 8955f8 8955fc } // n = 7, score = 100 // 33c0 | xor eax, eax // 8dbd26ffffff | lea edi, [ebp - 0xda] // 66899524ffffff | mov word ptr [ebp - 0xdc], dx // f3ab | rep stosd dword ptr es:[edi], eax // 8955e8 | mov dword ptr [ebp - 0x18], edx // 8955f8 | mov dword ptr [ebp - 8], edx // 8955fc | mov dword ptr [ebp - 4], edx $sequence_13 = { 40 0068ae 224000 50 b822010000 } // n = 5, score = 100 // 40 | inc eax // 0068ae | add byte ptr [eax - 0x52], ch // 224000 | and al, byte ptr [eax] // 50 | push eax // b822010000 | mov eax, 0x122 $sequence_14 = { 8895a0c5ffff f3ab aa b91f000000 33c0 8dbd4affffff 66899548ffffff } // n = 7, score = 100 // 8895a0c5ffff | mov byte ptr [ebp - 0x3a60], dl // f3ab | rep stosd dword ptr es:[edi], eax // aa | stosb byte ptr es:[edi], al // b91f000000 | mov ecx, 0x1f // 33c0 | xor eax, eax // 8dbd4affffff | lea edi, [ebp - 0xb6] // 66899548ffffff | mov word ptr [ebp - 0xb8], dx $sequence_15 = { 8b15???????? 8945d8 a1???????? 894ddc 668b0d???????? } // n = 5, score = 100 // 8b15???????? | // 8945d8 | mov dword ptr [ebp - 0x28], eax // a1???????? | // 894ddc | mov dword ptr [ebp - 0x24], ecx // 668b0d???????? | condition: 7 of them and filesize < 188416 }
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