Actor(s): IXESHE
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rule win_waterspout_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.waterspout." 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.waterspout" 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 = { 8b44240c 53 56 8b742410 57 3bd6 7412 } // n = 7, score = 200 // 8b44240c | mov eax, dword ptr [esp + 0xc] // 53 | push ebx // 56 | push esi // 8b742410 | mov esi, dword ptr [esp + 0x10] // 57 | push edi // 3bd6 | cmp edx, esi // 7412 | je 0x14 $sequence_1 = { 8d44241c 8b11 8bce 52 6a00 50 } // n = 6, score = 200 // 8d44241c | lea eax, [esp + 0x1c] // 8b11 | mov edx, dword ptr [ecx] // 8bce | mov ecx, esi // 52 | push edx // 6a00 | push 0 // 50 | push eax $sequence_2 = { c68424430100004e c684244401000008 c68424450100002e c6842446010000a1 c684244701000066 c684244801000028 c6842449010000d9 } // n = 7, score = 200 // c68424430100004e | mov byte ptr [esp + 0x143], 0x4e // c684244401000008 | mov byte ptr [esp + 0x144], 8 // c68424450100002e | mov byte ptr [esp + 0x145], 0x2e // c6842446010000a1 | mov byte ptr [esp + 0x146], 0xa1 // c684244701000066 | mov byte ptr [esp + 0x147], 0x66 // c684244801000028 | mov byte ptr [esp + 0x148], 0x28 // c6842449010000d9 | mov byte ptr [esp + 0x149], 0xd9 $sequence_3 = { 56 0fbe44242c 03ca 8ae0 8801 8d4c2418 ff15???????? } // n = 7, score = 200 // 56 | push esi // 0fbe44242c | movsx eax, byte ptr [esp + 0x2c] // 03ca | add ecx, edx // 8ae0 | mov ah, al // 8801 | mov byte ptr [ecx], al // 8d4c2418 | lea ecx, [esp + 0x18] // ff15???????? | $sequence_4 = { c3 83f801 7563 81fe00040000 7704 8bee 7514 } // n = 7, score = 200 // c3 | ret // 83f801 | cmp eax, 1 // 7563 | jne 0x65 // 81fe00040000 | cmp esi, 0x400 // 7704 | ja 6 // 8bee | mov ebp, esi // 7514 | jne 0x16 $sequence_5 = { c644242001 8b54241c 52 ff15???????? 8b442420 5d 5f } // n = 7, score = 200 // c644242001 | mov byte ptr [esp + 0x20], 1 // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 52 | push edx // ff15???????? | // 8b442420 | mov eax, dword ptr [esp + 0x20] // 5d | pop ebp // 5f | pop edi $sequence_6 = { 7503 55 eb01 53 56 e8???????? } // n = 6, score = 200 // 7503 | jne 5 // 55 | push ebp // eb01 | jmp 3 // 53 | push ebx // 56 | push esi // e8???????? | $sequence_7 = { ba01000000 8d7801 896c241c 8d4c2414 8bc7 be04000000 8a18 } // n = 7, score = 200 // ba01000000 | mov edx, 1 // 8d7801 | lea edi, [eax + 1] // 896c241c | mov dword ptr [esp + 0x1c], ebp // 8d4c2414 | lea ecx, [esp + 0x14] // 8bc7 | mov eax, edi // be04000000 | mov esi, 4 // 8a18 | mov bl, byte ptr [eax] $sequence_8 = { 0bc7 8a4c042c 51 6a01 8d4c2424 ff15???????? 83e63f } // n = 7, score = 200 // 0bc7 | or eax, edi // 8a4c042c | mov cl, byte ptr [esp + eax + 0x2c] // 51 | push ecx // 6a01 | push 1 // 8d4c2424 | lea ecx, [esp + 0x24] // ff15???????? | // 83e63f | and esi, 0x3f $sequence_9 = { 88442415 51 e8???????? 8a4e02 8a5603 32c1 8a0e } // n = 7, score = 200 // 88442415 | mov byte ptr [esp + 0x15], al // 51 | push ecx // e8???????? | // 8a4e02 | mov cl, byte ptr [esi + 2] // 8a5603 | mov dl, byte ptr [esi + 3] // 32c1 | xor al, cl // 8a0e | mov cl, byte ptr [esi] condition: 7 of them and filesize < 98304 }
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