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rule win_satana_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.satana." 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.satana" 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 = { 99 bfff000000 f7ff 8a9258fd4000 } // n = 4, score = 100 // 99 | cdq // bfff000000 | mov edi, 0xff // f7ff | idiv edi // 8a9258fd4000 | mov dl, byte ptr [edx + 0x40fd58] $sequence_1 = { 8b4508 8b0d???????? 0fb615???????? 83c40c 68???????? 8b3d???????? 8d7004 } // n = 7, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b0d???????? | // 0fb615???????? | // 83c40c | add esp, 0xc // 68???????? | // 8b3d???????? | // 8d7004 | lea esi, [eax + 4] $sequence_2 = { 8945e0 660fefc0 660fd600 660fd64008 660fd64010 } // n = 5, score = 100 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 660fefc0 | pxor xmm0, xmm0 // 660fd600 | movq qword ptr [eax], xmm0 // 660fd64008 | movq qword ptr [eax + 8], xmm0 // 660fd64010 | movq qword ptr [eax + 0x10], xmm0 $sequence_3 = { ff15???????? a3???????? 85c0 7409 ffd0 } // n = 5, score = 100 // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 7409 | je 0xb // ffd0 | call eax $sequence_4 = { 0fb64dff 0fb689a83f4100 884dff 8b5dfc } // n = 4, score = 100 // 0fb64dff | movzx ecx, byte ptr [ebp - 1] // 0fb689a83f4100 | movzx ecx, byte ptr [ecx + 0x413fa8] // 884dff | mov byte ptr [ebp - 1], cl // 8b5dfc | mov ebx, dword ptr [ebp - 4] $sequence_5 = { 83ffff 7454 53 56 } // n = 4, score = 100 // 83ffff | cmp edi, -1 // 7454 | je 0x56 // 53 | push ebx // 56 | push esi $sequence_6 = { e8???????? f30f7e05???????? 8a0d???????? 660fd645e8 f30f7e05???????? 83c40c 660fd645f0 } // n = 7, score = 100 // e8???????? | // f30f7e05???????? | // 8a0d???????? | // 660fd645e8 | movq qword ptr [ebp - 0x18], xmm0 // f30f7e05???????? | // 83c40c | add esp, 0xc // 660fd645f0 | movq qword ptr [ebp - 0x10], xmm0 $sequence_7 = { 50 e8???????? 83c404 68???????? ff15???????? 6a4e } // n = 6, score = 100 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 68???????? | // ff15???????? | // 6a4e | push 0x4e $sequence_8 = { 8bf8 83ffff 7454 53 56 6a00 57 } // n = 7, score = 100 // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 7454 | je 0x56 // 53 | push ebx // 56 | push esi // 6a00 | push 0 // 57 | push edi $sequence_9 = { 8a11 3a16 7563 83f801 7615 8a5101 } // n = 6, score = 100 // 8a11 | mov dl, byte ptr [ecx] // 3a16 | cmp dl, byte ptr [esi] // 7563 | jne 0x65 // 83f801 | cmp eax, 1 // 7615 | jbe 0x17 // 8a5101 | mov dl, byte ptr [ecx + 1] condition: 7 of them and filesize < 221184 }
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