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rule win_sendsafe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.sendsafe." 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.sendsafe" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { e8???????? 83c404 8985f8fbffff 83bdf8fbffff00 0f84e8000000 33c9 8b85f8fbffff } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 8985f8fbffff | mov dword ptr [ebp - 0x408], eax // 83bdf8fbffff00 | cmp dword ptr [ebp - 0x408], 0 // 0f84e8000000 | je 0xee // 33c9 | xor ecx, ecx // 8b85f8fbffff | mov eax, dword ptr [ebp - 0x408] $sequence_1 = { e8???????? c745fc00000000 8b45e8 83c018 8945ec 8b4dec c70100000000 } // n = 7, score = 200 // e8???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 83c018 | add eax, 0x18 // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // c70100000000 | mov dword ptr [ecx], 0 $sequence_2 = { e9???????? 8b45e8 83c018 50 8b4d08 51 8b5508 } // n = 7, score = 200 // e9???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 83c018 | add eax, 0x18 // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_3 = { e8???????? 83c410 81bda8fdffffffffff7f 7628 68ffffff7f 8b85a8fdffff 50 } // n = 7, score = 200 // e8???????? | // 83c410 | add esp, 0x10 // 81bda8fdffffffffff7f | cmp dword ptr [ebp - 0x258], 0x7fffffff // 7628 | jbe 0x2a // 68ffffff7f | push 0x7fffffff // 8b85a8fdffff | mov eax, dword ptr [ebp - 0x258] // 50 | push eax $sequence_4 = { 8b55fc c7423800000000 8b45fc 8b4dfc 8b5108 895020 c745f800000000 } // n = 7, score = 200 // 8b55fc | mov edx, dword ptr [ebp - 4] // c7423800000000 | mov dword ptr [edx + 0x38], 0 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8b5108 | mov edx, dword ptr [ecx + 8] // 895020 | mov dword ptr [eax + 0x20], edx // c745f800000000 | mov dword ptr [ebp - 8], 0 $sequence_5 = { e9???????? 8b5514 8955fc eb09 8b45fc 83c001 8945fc } // n = 7, score = 200 // e9???????? | // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 8955fc | mov dword ptr [ebp - 4], edx // eb09 | jmp 0xb // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax $sequence_6 = { e8???????? 83c418 e9???????? 55 e8???????? 68b40b0000 ebd8 } // n = 7, score = 200 // e8???????? | // 83c418 | add esp, 0x18 // e9???????? | // 55 | push ebp // e8???????? | // 68b40b0000 | push 0xbb4 // ebd8 | jmp 0xffffffda $sequence_7 = { ba02000000 c1e200 8b45f0 668b4dc8 66890c10 ba02000000 d1e2 } // n = 7, score = 200 // ba02000000 | mov edx, 2 // c1e200 | shl edx, 0 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 668b4dc8 | mov cx, word ptr [ebp - 0x38] // 66890c10 | mov word ptr [eax + edx], cx // ba02000000 | mov edx, 2 // d1e2 | shl edx, 1 $sequence_8 = { 8b5508 8b45fc 8b481c 898af8000000 8b5508 8b45fc 8b4820 } // n = 7, score = 200 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b481c | mov ecx, dword ptr [eax + 0x1c] // 898af8000000 | mov dword ptr [edx + 0xf8], ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4820 | mov ecx, dword ptr [eax + 0x20] $sequence_9 = { e8???????? 83c40c 85c0 0f8595010000 ff742448 ff742448 e8???????? } // n = 7, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 0f8595010000 | jne 0x19b // ff742448 | push dword ptr [esp + 0x48] // ff742448 | push dword ptr [esp + 0x48] // e8???????? | condition: 7 of them and filesize < 3743744 }
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