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rule win_newsreels_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.newsreels." 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.newsreels" 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 = { 8bc8 55 8bd9 56 57 c1e902 } // n = 6, score = 100 // 8bc8 | mov ecx, eax // 55 | push ebp // 8bd9 | mov ebx, ecx // 56 | push esi // 57 | push edi // c1e902 | shr ecx, 2 $sequence_1 = { 8d542448 c744244844000000 52 ff15???????? } // n = 4, score = 100 // 8d542448 | lea edx, [esp + 0x48] // c744244844000000 | mov dword ptr [esp + 0x48], 0x44 // 52 | push edx // ff15???????? | $sequence_2 = { f3a4 0f8558040000 bd88130000 8d842490010000 682c010000 50 e8???????? } // n = 7, score = 100 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 0f8558040000 | jne 0x45e // bd88130000 | mov ebp, 0x1388 // 8d842490010000 | lea eax, [esp + 0x190] // 682c010000 | push 0x12c // 50 | push eax // e8???????? | $sequence_3 = { 8d9424c0040000 885808 8b3d???????? 33c0 f2ae } // n = 5, score = 100 // 8d9424c0040000 | lea edx, [esp + 0x4c0] // 885808 | mov byte ptr [eax + 8], bl // 8b3d???????? | // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] $sequence_4 = { 8d44241c 52 50 66895c2468 c744246401010000 895c2424 } // n = 6, score = 100 // 8d44241c | lea eax, [esp + 0x1c] // 52 | push edx // 50 | push eax // 66895c2468 | mov word ptr [esp + 0x68], bx // c744246401010000 | mov dword ptr [esp + 0x64], 0x101 // 895c2424 | mov dword ptr [esp + 0x24], ebx $sequence_5 = { 50 e8???????? 8b4c2428 8b54242c 890e 895604 } // n = 6, score = 100 // 50 | push eax // e8???????? | // 8b4c2428 | mov ecx, dword ptr [esp + 0x28] // 8b54242c | mov edx, dword ptr [esp + 0x2c] // 890e | mov dword ptr [esi], ecx // 895604 | mov dword ptr [esi + 4], edx $sequence_6 = { 8d4c2420 6a01 51 e8???????? 53 } // n = 5, score = 100 // 8d4c2420 | lea ecx, [esp + 0x20] // 6a01 | push 1 // 51 | push ecx // e8???????? | // 53 | push ebx $sequence_7 = { 0bd0 895614 8b561c 8d040a 83f808 } // n = 5, score = 100 // 0bd0 | or edx, eax // 895614 | mov dword ptr [esi + 0x14], edx // 8b561c | mov edx, dword ptr [esi + 0x1c] // 8d040a | lea eax, [edx + ecx] // 83f808 | cmp eax, 8 $sequence_8 = { 68???????? 8d942494000000 6804010000 52 e8???????? 8dbc249c000000 } // n = 6, score = 100 // 68???????? | // 8d942494000000 | lea edx, [esp + 0x94] // 6804010000 | push 0x104 // 52 | push edx // e8???????? | // 8dbc249c000000 | lea edi, [esp + 0x9c] $sequence_9 = { 5b c20400 6685ff 7507 bd01000000 eb07 } // n = 6, score = 100 // 5b | pop ebx // c20400 | ret 4 // 6685ff | test di, di // 7507 | jne 9 // bd01000000 | mov ebp, 1 // eb07 | jmp 9 condition: 7 of them and filesize < 65536 }
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