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rule win_sendsafe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { ffd2 83c404 8945fc 837dfcff 7504 33c0 eb0d } // n = 7, score = 200 // ffd2 | call edx // 83c404 | add esp, 4 // 8945fc | mov dword ptr [ebp - 4], eax // 837dfcff | cmp dword ptr [ebp - 4], -1 // 7504 | jne 6 // 33c0 | xor eax, eax // eb0d | jmp 0xf $sequence_1 = { e9???????? c745e45c945b00 a1???????? eb5e ff775c 56 e8???????? } // n = 7, score = 200 // e9???????? | // c745e45c945b00 | mov dword ptr [ebp - 0x1c], 0x5b945c // a1???????? | // eb5e | jmp 0x60 // ff775c | push dword ptr [edi + 0x5c] // 56 | push esi // e8???????? | $sequence_2 = { 7509 c745a001000000 eb07 c745a000000000 0fb655a0 85d2 7516 } // n = 7, score = 200 // 7509 | jne 0xb // c745a001000000 | mov dword ptr [ebp - 0x60], 1 // eb07 | jmp 9 // c745a000000000 | mov dword ptr [ebp - 0x60], 0 // 0fb655a0 | movzx edx, byte ptr [ebp - 0x60] // 85d2 | test edx, edx // 7516 | jne 0x18 $sequence_3 = { eb07 c745f800000000 0fb655f8 85d2 7417 8b4508 83781410 } // n = 7, score = 200 // eb07 | jmp 9 // c745f800000000 | mov dword ptr [ebp - 8], 0 // 0fb655f8 | movzx edx, byte ptr [ebp - 8] // 85d2 | test edx, edx // 7417 | je 0x19 // 8b4508 | mov eax, dword ptr [ebp + 8] // 83781410 | cmp dword ptr [eax + 0x14], 0x10 $sequence_4 = { e8???????? 83c408 8985f8feffff 83bdf8feffff00 7430 8b8df8feffff c60100 } // n = 7, score = 200 // e8???????? | // 83c408 | add esp, 8 // 8985f8feffff | mov dword ptr [ebp - 0x108], eax // 83bdf8feffff00 | cmp dword ptr [ebp - 0x108], 0 // 7430 | je 0x32 // 8b8df8feffff | mov ecx, dword ptr [ebp - 0x108] // c60100 | mov byte ptr [ecx], 0 $sequence_5 = { f20f1045e4 f20f5805???????? f20f1145e4 f20f10459c 660f2f45e4 0f87b0fdffff f20f1045dc } // n = 7, score = 200 // f20f1045e4 | movsd xmm0, qword ptr [ebp - 0x1c] // f20f5805???????? | // f20f1145e4 | movsd qword ptr [ebp - 0x1c], xmm0 // f20f10459c | movsd xmm0, qword ptr [ebp - 0x64] // 660f2f45e4 | comisd xmm0, xmmword ptr [ebp - 0x1c] // 0f87b0fdffff | ja 0xfffffdb6 // f20f1045dc | movsd xmm0, qword ptr [ebp - 0x24] $sequence_6 = { e8???????? 83c404 8985a813ffff 8b85c413ffff 0fbe08 83f90d 7537 } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 8985a813ffff | mov dword ptr [ebp - 0xec58], eax // 8b85c413ffff | mov eax, dword ptr [ebp - 0xec3c] // 0fbe08 | movsx ecx, byte ptr [eax] // 83f90d | cmp ecx, 0xd // 7537 | jne 0x39 $sequence_7 = { e9???????? e8???????? 8bd0 89542434 85d2 7511 684f060000 } // n = 7, score = 200 // e9???????? | // e8???????? | // 8bd0 | mov edx, eax // 89542434 | mov dword ptr [esp + 0x34], edx // 85d2 | test edx, edx // 7511 | jne 0x13 // 684f060000 | push 0x64f $sequence_8 = { ffb0f0000000 6a0d 56 e8???????? 83c410 85c0 0f8e23020000 } // n = 7, score = 200 // ffb0f0000000 | push dword ptr [eax + 0xf0] // 6a0d | push 0xd // 56 | push esi // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 0f8e23020000 | jle 0x229 $sequence_9 = { ff15???????? 8b4df8 2b4118 6955f460ea0000 3bc2 771a 837de800 } // n = 7, score = 200 // ff15???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 2b4118 | sub eax, dword ptr [ecx + 0x18] // 6955f460ea0000 | imul edx, dword ptr [ebp - 0xc], 0xea60 // 3bc2 | cmp eax, edx // 771a | ja 0x1c // 837de800 | cmp dword ptr [ebp - 0x18], 0 condition: 7 of them and filesize < 3743744 }
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