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rule win_grabbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.grabbot." 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.grabbot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 83f85a 770d 83f841 7208 83c020 } // n = 5, score = 3300 // 83f85a | cmp eax, 0x5a // 770d | ja 0xf // 83f841 | cmp eax, 0x41 // 7208 | jb 0xa // 83c020 | add eax, 0x20 $sequence_1 = { 0fb702 83f85a 770b 83f841 7206 83c020 } // n = 6, score = 3300 // 0fb702 | movzx eax, word ptr [edx] // 83f85a | cmp eax, 0x5a // 770b | ja 0xd // 83f841 | cmp eax, 0x41 // 7206 | jb 8 // 83c020 | add eax, 0x20 $sequence_2 = { 7206 83c020 0fb7c0 83c202 } // n = 4, score = 3300 // 7206 | jb 8 // 83c020 | add eax, 0x20 // 0fb7c0 | movzx eax, ax // 83c202 | add edx, 2 $sequence_3 = { c745fc0f72a7dc 8145fc11111111 56 53 51 } // n = 5, score = 3200 // c745fc0f72a7dc | mov dword ptr [ebp - 4], 0xdca7720f // 8145fc11111111 | add dword ptr [ebp - 4], 0x11111111 // 56 | push esi // 53 | push ebx // 51 | push ecx $sequence_4 = { ad 3b450c 7406 e2f8 } // n = 4, score = 3200 // ad | lodsd eax, dword ptr [esi] // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 7406 | je 8 // e2f8 | loop 0xfffffffa $sequence_5 = { 53 8bd8 035b3c 66813b5045 5b 7407 2d00100000 } // n = 7, score = 3200 // 53 | push ebx // 8bd8 | mov ebx, eax // 035b3c | add ebx, dword ptr [ebx + 0x3c] // 66813b5045 | cmp word ptr [ebx], 0x4550 // 5b | pop ebx // 7407 | je 9 // 2d00100000 | sub eax, 0x1000 $sequence_6 = { c745c475726541 c745c864647265 66c745cc7373 c645ce00 } // n = 4, score = 3200 // c745c475726541 | mov dword ptr [ebp - 0x3c], 0x41657275 // c745c864647265 | mov dword ptr [ebp - 0x38], 0x65726464 // 66c745cc7373 | mov word ptr [ebp - 0x34], 0x7373 // c645ce00 | mov byte ptr [ebp - 0x32], 0 $sequence_7 = { 68391ef172 e8???????? 50 e8???????? ffe0 } // n = 5, score = 3200 // 68391ef172 | push 0x72f11e39 // e8???????? | // 50 | push eax // e8???????? | // ffe0 | jmp eax $sequence_8 = { 56 ffd0 33c9 66894c37fe } // n = 4, score = 2600 // 56 | push esi // ffd0 | call eax // 33c9 | xor ecx, ecx // 66894c37fe | mov word ptr [edi + esi - 2], cx $sequence_9 = { 89480c e9???????? 33c0 e9???????? } // n = 4, score = 2300 // 89480c | mov dword ptr [eax + 0xc], ecx // e9???????? | // 33c0 | xor eax, eax // e9???????? | $sequence_10 = { 894804 8b0d???????? 894808 8b0d???????? 89480c e9???????? } // n = 6, score = 2300 // 894804 | mov dword ptr [eax + 4], ecx // 8b0d???????? | // 894808 | mov dword ptr [eax + 8], ecx // 8b0d???????? | // 89480c | mov dword ptr [eax + 0xc], ecx // e9???????? | $sequence_11 = { 7428 8b0d???????? 8908 8b0d???????? 894804 8b0d???????? } // n = 6, score = 2300 // 7428 | je 0x2a // 8b0d???????? | // 8908 | mov dword ptr [eax], ecx // 8b0d???????? | // 894804 | mov dword ptr [eax + 4], ecx // 8b0d???????? | $sequence_12 = { 6a00 6840420f00 6a00 ff15???????? a3???????? 85c0 } // n = 6, score = 2000 // 6a00 | push 0 // 6840420f00 | push 0xf4240 // 6a00 | push 0 // ff15???????? | // a3???????? | // 85c0 | test eax, eax $sequence_13 = { 85f6 741e 57 56 6aff } // n = 5, score = 2000 // 85f6 | test esi, esi // 741e | je 0x20 // 57 | push edi // 56 | push esi // 6aff | push -1 $sequence_14 = { 85c0 56 0f9fc3 e8???????? 83c414 } // n = 5, score = 2000 // 85c0 | test eax, eax // 56 | push esi // 0f9fc3 | setg bl // e8???????? | // 83c414 | add esp, 0x14 $sequence_15 = { 8bf0 85f6 741d 8d4601 50 e8???????? 8bf8 } // n = 7, score = 2000 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 741d | je 0x1f // 8d4601 | lea eax, [esi + 1] // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax condition: 7 of them and filesize < 1335296 }
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