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rule win_aveo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.aveo." 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.aveo" 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 = { 7515 68???????? e8???????? 83c404 899ddcfaffff } // n = 5, score = 200 // 7515 | jne 0x17 // 68???????? | // e8???????? | // 83c404 | add esp, 4 // 899ddcfaffff | mov dword ptr [ebp - 0x524], ebx $sequence_1 = { ff45f8 fec2 80fa40 72ed } // n = 4, score = 200 // ff45f8 | inc dword ptr [ebp - 8] // fec2 | inc dl // 80fa40 | cmp dl, 0x40 // 72ed | jb 0xffffffef $sequence_2 = { 68???????? c705????????00000000 c705????????00000000 a3???????? c705????????0c000000 c705????????00000000 a3???????? } // n = 7, score = 200 // 68???????? | // c705????????00000000 | // c705????????00000000 | // a3???????? | // c705????????0c000000 | // c705????????00000000 | // a3???????? | $sequence_3 = { 89b504feffff 56 899df0fdffff e8???????? 83c404 8985f8fdffff 3bc3 } // n = 7, score = 200 // 89b504feffff | mov dword ptr [ebp - 0x1fc], esi // 56 | push esi // 899df0fdffff | mov dword ptr [ebp - 0x210], ebx // e8???????? | // 83c404 | add esp, 4 // 8985f8fdffff | mov dword ptr [ebp - 0x208], eax // 3bc3 | cmp eax, ebx $sequence_4 = { 6800010000 8d84241c010000 57 50 } // n = 4, score = 200 // 6800010000 | push 0x100 // 8d84241c010000 | lea eax, [esp + 0x11c] // 57 | push edi // 50 | push eax $sequence_5 = { 50 f3a4 ff15???????? 6800010000 8d8df8feffff 6a00 51 } // n = 7, score = 200 // 50 | push eax // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // ff15???????? | // 6800010000 | push 0x100 // 8d8df8feffff | lea ecx, [ebp - 0x108] // 6a00 | push 0 // 51 | push ecx $sequence_6 = { c1f905 8b0c8d002e4100 83e01f c1e006 8d440124 8b4d10 } // n = 6, score = 200 // c1f905 | sar ecx, 5 // 8b0c8d002e4100 | mov ecx, dword ptr [ecx*4 + 0x412e00] // 83e01f | and eax, 0x1f // c1e006 | shl eax, 6 // 8d440124 | lea eax, [ecx + eax + 0x24] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] $sequence_7 = { 8d85f4fbffff 68???????? 50 e8???????? 6a44 8d8d9cf9ffff } // n = 6, score = 200 // 8d85f4fbffff | lea eax, [ebp - 0x40c] // 68???????? | // 50 | push eax // e8???????? | // 6a44 | push 0x44 // 8d8d9cf9ffff | lea ecx, [ebp - 0x664] $sequence_8 = { 83e00f eb02 33c0 0fbe84c178e24000 } // n = 4, score = 200 // 83e00f | and eax, 0xf // eb02 | jmp 4 // 33c0 | xor eax, eax // 0fbe84c178e24000 | movsx eax, byte ptr [ecx + eax*8 + 0x40e278] $sequence_9 = { 899dd8efffff 89b5e4efffff 89b5d4efffff eb06 8bbdf0efffff 6800100000 } // n = 6, score = 200 // 899dd8efffff | mov dword ptr [ebp - 0x1028], ebx // 89b5e4efffff | mov dword ptr [ebp - 0x101c], esi // 89b5d4efffff | mov dword ptr [ebp - 0x102c], esi // eb06 | jmp 8 // 8bbdf0efffff | mov edi, dword ptr [ebp - 0x1010] // 6800100000 | push 0x1000 condition: 7 of them and filesize < 180224 }
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