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rule win_grabbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 0fb702 83f85a 770b 83f841 } // n = 4, score = 3300 // 0fb702 | movzx eax, word ptr [edx] // 83f85a | cmp eax, 0x5a // 770b | ja 0xd // 83f841 | cmp eax, 0x41 $sequence_1 = { 770b 83f841 7206 83c020 0fb7c0 83c202 } // n = 6, score = 3300 // 770b | ja 0xd // 83f841 | cmp eax, 0x41 // 7206 | jb 8 // 83c020 | add eax, 0x20 // 0fb7c0 | movzx eax, ax // 83c202 | add edx, 2 $sequence_2 = { 770d 83f841 7208 83c020 } // n = 4, score = 3300 // 770d | ja 0xf // 83f841 | cmp eax, 0x41 // 7208 | jb 0xa // 83c020 | add eax, 0x20 $sequence_3 = { 6a04 52 e8???????? 5a 85c0 0f859a000000 8bfa } // n = 7, score = 3200 // 6a04 | push 4 // 52 | push edx // e8???????? | // 5a | pop edx // 85c0 | test eax, eax // 0f859a000000 | jne 0xa0 // 8bfa | mov edi, edx $sequence_4 = { e8???????? 50 e8???????? ffe0 c3 68d0035c09 e8???????? } // n = 7, score = 3200 // e8???????? | // 50 | push eax // e8???????? | // ffe0 | jmp eax // c3 | ret // 68d0035c09 | push 0x95c03d0 // e8???????? | $sequence_5 = { 8b80c0000000 85c0 7424 03c3 8b5d34 } // n = 5, score = 3200 // 8b80c0000000 | mov eax, dword ptr [eax + 0xc0] // 85c0 | test eax, eax // 7424 | je 0x26 // 03c3 | add eax, ebx // 8b5d34 | mov ebx, dword ptr [ebp + 0x34] $sequence_6 = { 03ca 3bc1 773f 81ec80000000 8bdc 53 } // n = 6, score = 3200 // 03ca | add ecx, edx // 3bc1 | cmp eax, ecx // 773f | ja 0x41 // 81ec80000000 | sub esp, 0x80 // 8bdc | mov ebx, esp // 53 | push ebx $sequence_7 = { 85c0 0f88b6000000 8b55fc 85d2 0f84ab000000 8b33 } // n = 6, score = 3200 // 85c0 | test eax, eax // 0f88b6000000 | js 0xbc // 8b55fc | mov edx, dword ptr [ebp - 4] // 85d2 | test edx, edx // 0f84ab000000 | je 0xb1 // 8b33 | mov esi, dword ptr [ebx] $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 = { 7428 8b0d???????? 8908 8b0d???????? 894804 } // n = 5, score = 2300 // 7428 | je 0x2a // 8b0d???????? | // 8908 | mov dword ptr [eax], ecx // 8b0d???????? | // 894804 | mov dword ptr [eax + 4], ecx $sequence_10 = { 89480c e9???????? 33c0 e9???????? } // n = 4, score = 2300 // 89480c | mov dword ptr [eax + 0xc], ecx // e9???????? | // 33c0 | xor eax, eax // e9???????? | $sequence_11 = { 8b0d???????? 894804 8b0d???????? 894808 8b0d???????? 89480c e9???????? } // n = 7, score = 2300 // 8b0d???????? | // 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_12 = { ff15???????? 50 ff15???????? a3???????? 85c0 7505 83c8ff } // n = 7, score = 2000 // ff15???????? | // 50 | push eax // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 7505 | jne 7 // 83c8ff | or eax, 0xffffffff $sequence_13 = { 85c0 56 0f9fc3 e8???????? 83c414 5e 8ac3 } // n = 7, score = 2000 // 85c0 | test eax, eax // 56 | push esi // 0f9fc3 | setg bl // e8???????? | // 83c414 | add esp, 0x14 // 5e | pop esi // 8ac3 | mov al, bl $sequence_14 = { ff15???????? 85c0 741b 8d440002 50 e8???????? } // n = 6, score = 2000 // ff15???????? | // 85c0 | test eax, eax // 741b | je 0x1d // 8d440002 | lea eax, [eax + eax + 2] // 50 | push eax // e8???????? | $sequence_15 = { 33ff 85f6 7405 83feff } // n = 4, score = 2000 // 33ff | xor edi, edi // 85f6 | test esi, esi // 7405 | je 7 // 83feff | cmp esi, -1 condition: 7 of them and filesize < 1335296 }
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