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rule win_sendsafe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 8b45f8 83b88400000000 0f84af000000 8b4df8 8b55f8 8b818c000000 3b8288000000 } // n = 7, score = 200 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83b88400000000 | cmp dword ptr [eax + 0x84], 0 // 0f84af000000 | je 0xb5 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b818c000000 | mov eax, dword ptr [ecx + 0x8c] // 3b8288000000 | cmp eax, dword ptr [edx + 0x88] $sequence_1 = { ebb4 8b450c 8b4dfc 8b548134 8955ec 8b450c 8b4dfc } // n = 7, score = 200 // ebb4 | jmp 0xffffffb6 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8b548134 | mov edx, dword ptr [ecx + eax*4 + 0x34] // 8955ec | mov dword ptr [ebp - 0x14], edx // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_2 = { f30f59040a f30f1185b4feffff b804000000 6bc800 8b95f8feffff f30f1085b4feffff f30f11040a } // n = 7, score = 200 // f30f59040a | mulss xmm0, dword ptr [edx + ecx] // f30f1185b4feffff | movss dword ptr [ebp - 0x14c], xmm0 // b804000000 | mov eax, 4 // 6bc800 | imul ecx, eax, 0 // 8b95f8feffff | mov edx, dword ptr [ebp - 0x108] // f30f1085b4feffff | movss xmm0, dword ptr [ebp - 0x14c] // f30f11040a | movss dword ptr [edx + ecx], xmm0 $sequence_3 = { 8b5104 8b4220 ffd0 83c414 8945d0 8b4dd4 8b5108 } // n = 7, score = 200 // 8b5104 | mov edx, dword ptr [ecx + 4] // 8b4220 | mov eax, dword ptr [edx + 0x20] // ffd0 | call eax // 83c414 | add esp, 0x14 // 8945d0 | mov dword ptr [ebp - 0x30], eax // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 8b5108 | mov edx, dword ptr [ecx + 8] $sequence_4 = { 8b4dd4 f30f110481 8b55fc 83c201 8955fc eb9d eb83 } // n = 7, score = 200 // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // f30f110481 | movss dword ptr [ecx + eax*4], xmm0 // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx // eb9d | jmp 0xffffff9f // eb83 | jmp 0xffffff85 $sequence_5 = { e8???????? 83c404 8985fc6fffff 8b8dfc6fffff 898d5470ffff 8b5508 52 } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 8985fc6fffff | mov dword ptr [ebp - 0x9004], eax // 8b8dfc6fffff | mov ecx, dword ptr [ebp - 0x9004] // 898d5470ffff | mov dword ptr [ebp - 0x8fac], ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx $sequence_6 = { e8???????? 83c40c 85c0 750a b942020000 e9???????? 83fb21 } // n = 7, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 750a | jne 0xc // b942020000 | mov ecx, 0x242 // e9???????? | // 83fb21 | cmp ebx, 0x21 $sequence_7 = { e9???????? 8b442410 55 50 8d4804 51 56 } // n = 7, score = 200 // e9???????? | // 8b442410 | mov eax, dword ptr [esp + 0x10] // 55 | push ebp // 50 | push eax // 8d4804 | lea ecx, [eax + 4] // 51 | push ecx // 56 | push esi $sequence_8 = { e8???????? 8b5508 837a1410 7219 8b8518ffffff 89855cffffff 8b4d08 } // n = 7, score = 200 // e8???????? | // 8b5508 | mov edx, dword ptr [ebp + 8] // 837a1410 | cmp dword ptr [edx + 0x14], 0x10 // 7219 | jb 0x1b // 8b8518ffffff | mov eax, dword ptr [ebp - 0xe8] // 89855cffffff | mov dword ptr [ebp - 0xa4], eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_9 = { e8???????? b001 e9???????? c785f0faffff18000000 8b95f8faffff 837a3c03 0f85c7000000 } // n = 7, score = 200 // e8???????? | // b001 | mov al, 1 // e9???????? | // c785f0faffff18000000 | mov dword ptr [ebp - 0x510], 0x18 // 8b95f8faffff | mov edx, dword ptr [ebp - 0x508] // 837a3c03 | cmp dword ptr [edx + 0x3c], 3 // 0f85c7000000 | jne 0xcd condition: 7 of them and filesize < 3743744 }
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