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rule win_webc2_cson_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_cson." 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.webc2_cson" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { c745f420000000 ffd6 8d8540ffffff 50 ff15???????? 8bf0 8d4601 } // n = 7, score = 100 // c745f420000000 | mov dword ptr [ebp - 0xc], 0x20 // ffd6 | call esi // 8d8540ffffff | lea eax, [ebp - 0xc0] // 50 | push eax // ff15???????? | // 8bf0 | mov esi, eax // 8d4601 | lea eax, [esi + 1] $sequence_1 = { 66ab aa 8d85c0d6ffff 50 e8???????? 85c0 59 } // n = 7, score = 100 // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 8d85c0d6ffff | lea eax, [ebp - 0x2940] // 50 | push eax // e8???????? | // 85c0 | test eax, eax // 59 | pop ecx $sequence_2 = { 48 0f849c010000 83e803 0f8473010000 } // n = 4, score = 100 // 48 | dec eax // 0f849c010000 | je 0x1a2 // 83e803 | sub eax, 3 // 0f8473010000 | je 0x179 $sequence_3 = { 6a1e 8db5f6feffff 59 8dbd70ffffff f3a5 6a04 8d8570ffffff } // n = 7, score = 100 // 6a1e | push 0x1e // 8db5f6feffff | lea esi, [ebp - 0x10a] // 59 | pop ecx // 8dbd70ffffff | lea edi, [ebp - 0x90] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 6a04 | push 4 // 8d8570ffffff | lea eax, [ebp - 0x90] $sequence_4 = { 7515 53 ffd6 55 ffd6 57 } // n = 6, score = 100 // 7515 | jne 0x17 // 53 | push ebx // ffd6 | call esi // 55 | push ebp // ffd6 | call esi // 57 | push edi $sequence_5 = { 56 c785d8feffff28010000 e8???????? 85c0 744d 8d85d8feffff } // n = 6, score = 100 // 56 | push esi // c785d8feffff28010000 | mov dword ptr [ebp - 0x128], 0x128 // e8???????? | // 85c0 | test eax, eax // 744d | je 0x4f // 8d85d8feffff | lea eax, [ebp - 0x128] $sequence_6 = { ff15???????? 8bd8 85db 7512 55 ffd6 } // n = 6, score = 100 // ff15???????? | // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7512 | jne 0x14 // 55 | push ebp // ffd6 | call esi $sequence_7 = { 81ec54030000 53 56 8b35???????? 57 33db 68???????? } // n = 7, score = 100 // 81ec54030000 | sub esp, 0x354 // 53 | push ebx // 56 | push esi // 8b35???????? | // 57 | push edi // 33db | xor ebx, ebx // 68???????? | $sequence_8 = { c745c43c000000 c745c840000000 c745d078434000 8945d8 ffd7 8b35???????? } // n = 6, score = 100 // c745c43c000000 | mov dword ptr [ebp - 0x3c], 0x3c // c745c840000000 | mov dword ptr [ebp - 0x38], 0x40 // c745d078434000 | mov dword ptr [ebp - 0x30], 0x404378 // 8945d8 | mov dword ptr [ebp - 0x28], eax // ffd7 | call edi // 8b35???????? | $sequence_9 = { 6800020000 ff15???????? 8d85acfcffff 50 e8???????? 80bc05abfcffff5c 59 } // n = 7, score = 100 // 6800020000 | push 0x200 // ff15???????? | // 8d85acfcffff | lea eax, [ebp - 0x354] // 50 | push eax // e8???????? | // 80bc05abfcffff5c | cmp byte ptr [ebp + eax - 0x355], 0x5c // 59 | pop ecx condition: 7 of them and filesize < 98304 }
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