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rule win_newsreels_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 50 c6442414ff c644241502 c6442416b7 c6442417bc } // n = 5, score = 100 // 50 | push eax // c6442414ff | mov byte ptr [esp + 0x14], 0xff // c644241502 | mov byte ptr [esp + 0x15], 2 // c6442416b7 | mov byte ptr [esp + 0x16], 0xb7 // c6442417bc | mov byte ptr [esp + 0x17], 0xbc $sequence_1 = { 895c2418 8bde 2bd9 83c304 895c241c eb04 8b542424 } // n = 7, score = 100 // 895c2418 | mov dword ptr [esp + 0x18], ebx // 8bde | mov ebx, esi // 2bd9 | sub ebx, ecx // 83c304 | add ebx, 4 // 895c241c | mov dword ptr [esp + 0x1c], ebx // eb04 | jmp 6 // 8b542424 | mov edx, dword ptr [esp + 0x24] $sequence_2 = { 8b54241c 52 ffd6 8b442418 50 ffd6 } // n = 6, score = 100 // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 52 | push edx // ffd6 | call esi // 8b442418 | mov eax, dword ptr [esp + 0x18] // 50 | push eax // ffd6 | call esi $sequence_3 = { 68???????? 50 ff15???????? 8bd8 85db 750e 5e } // n = 7, score = 100 // 68???????? | // 50 | push eax // ff15???????? | // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 750e | jne 0x10 // 5e | pop esi $sequence_4 = { 52 68???????? e8???????? 8a542b01 } // n = 4, score = 100 // 52 | push edx // 68???????? | // e8???????? | // 8a542b01 | mov dl, byte ptr [ebx + ebp + 1] $sequence_5 = { 8b16 8d442408 52 50 } // n = 4, score = 100 // 8b16 | mov edx, dword ptr [esi] // 8d442408 | lea eax, [esp + 8] // 52 | push edx // 50 | push eax $sequence_6 = { 52 68???????? e8???????? 8a4c2b01 2d???????? c1f802 0ac8 } // n = 7, score = 100 // 52 | push edx // 68???????? | // e8???????? | // 8a4c2b01 | mov cl, byte ptr [ebx + ebp + 1] // 2d???????? | // c1f802 | sar eax, 2 // 0ac8 | or cl, al $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 = { 0fbe543e01 52 51 e8???????? 8a142b 2d???????? } // n = 6, score = 100 // 0fbe543e01 | movsx edx, byte ptr [esi + edi + 1] // 52 | push edx // 51 | push ecx // e8???????? | // 8a142b | mov dl, byte ptr [ebx + ebp] // 2d???????? | $sequence_9 = { 5b 81c410050000 c3 8d4c240c 8d942418010000 } // n = 5, score = 100 // 5b | pop ebx // 81c410050000 | add esp, 0x510 // c3 | ret // 8d4c240c | lea ecx, [esp + 0xc] // 8d942418010000 | lea edx, [esp + 0x118] condition: 7 of them and filesize < 65536 }
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