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rule win_grabbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { ffe0 c3 55 8bec 51 53 52 } // n = 7, score = 3600 // ffe0 | dec ecx // c3 | mov edi, ebp // 55 | dec ebp // 8bec | test ebp, ebp // 51 | je 0xba2 // 53 | dec eax // 52 | mov eax, dword ptr [edi] $sequence_1 = { e8???????? ffe0 c3 68a0f7bf08 e8???????? } // n = 5, score = 3600 // e8???????? | // ffe0 | dec eax // c3 | test esi, esi // 68a0f7bf08 | je 0xc07 // e8???????? | $sequence_2 = { 03ca 3bc1 773f 81ec80000000 8bdc 53 } // n = 6, score = 3600 // 03ca | push 0 // 3bc1 | mov bl, al // 773f | add esp, 0xc // 81ec80000000 | mov al, bl // 8bdc | pop edi // 53 | mov bl, al $sequence_3 = { 8919 648b152c000000 8b3c9a 8b30 } // n = 4, score = 3600 // 8919 | jb 0xf2 // 648b152c000000 | push eax // 8b3c9a | lea eax, [ebp - 0x5c] // 8b30 | jb 2 $sequence_4 = { 6683c020 0fb70a 6683f95a 770a 6683f941 } // n = 5, score = 3600 // 6683c020 | dec eax // 0fb70a | mov dword ptr [ebp + 0xf], eax // 6683f95a | dec eax // 770a | mov eax, dword ptr [ecx + 0x20] // 6683f941 | dec eax $sequence_5 = { 5a 5b 59 c9 c20800 eb25 8b0424 } // n = 7, score = 3600 // 5a | pop eax // 5b | dec eax // 59 | mov byte ptr [ebp + eax - 0x40], bl // c9 | jne 0x888 // c20800 | cmp edi, ebx // eb25 | je 0x8da // 8b0424 | mov ecx, edi $sequence_6 = { 741a 3b8884000000 7312 85f6 } // n = 4, score = 3600 // 741a | push ebx // 3b8884000000 | push 0x2719 // 7312 | mov eax, esi // 85f6 | push ebx $sequence_7 = { 8b8c18b0000000 85c9 7460 83bc188400000005 7656 8bbc18b4000000 } // n = 6, score = 3600 // 8b8c18b0000000 | dec eax // 85c9 | mov ebp, esp // 7460 | dec eax // 83bc188400000005 | sub esp, 0x80 // 7656 | mov eax, 0x63 // 8bbc18b4000000 | dec esp $sequence_8 = { e8???????? ff750c ff7508 ffd0 5a 5b } // n = 6, score = 3600 // e8???????? | // ff750c | jbe 0x1d4c // ff7508 | jne 0x1d0e // ffd0 | mov dword ptr [ebp - 8], 1 // 5a | mov edx, dword ptr [ebp - 0x14] // 5b | mov dword ptr [ebp - 0x10], edx $sequence_9 = { 53 e8???????? 59 81c480000000 50 } // n = 5, score = 3600 // 53 | and dword ptr [eax + 0x18], 0 // e8???????? | // 59 | dec eax // 81c480000000 | and dword ptr [eax + 0x20], 0 // 50 | xor bl, bl condition: 7 of them and filesize < 1335296 }
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