There is no description at this point.
rule win_grabbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 83f841 7206 83c020 0fb7c0 } // n = 4, score = 3300 // 83f841 | cmp eax, 0x41 // 7206 | jb 8 // 83c020 | add eax, 0x20 // 0fb7c0 | movzx eax, ax $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 = { ffd0 c20400 b8ff1f7cc9 50 e8???????? 50 } // n = 6, score = 3200 // ffd0 | call eax // c20400 | ret 4 // b8ff1f7cc9 | mov eax, 0xc97c1fff // 50 | push eax // e8???????? | // 50 | push eax $sequence_4 = { 8d7008 50 66ad 85d2 741b 6685c0 7411 } // n = 7, score = 3200 // 8d7008 | lea esi, [eax + 8] // 50 | push eax // 66ad | lodsw ax, word ptr [esi] // 85d2 | test edx, edx // 741b | je 0x1d // 6685c0 | test ax, ax // 7411 | je 0x13 $sequence_5 = { 682f6f0610 e8???????? 50 e8???????? ff7514 } // n = 5, score = 3200 // 682f6f0610 | push 0x10066f2f // e8???????? | // 50 | push eax // e8???????? | // ff7514 | push dword ptr [ebp + 0x14] $sequence_6 = { 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_7 = { 33c0 5b 8be5 5d c3 8b4210 5f } // n = 7, score = 3200 // 33c0 | xor eax, eax // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8b4210 | mov eax, dword ptr [edx + 0x10] // 5f | pop edi $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 = { 8b0d???????? 89480c e9???????? 33c0 e9???????? } // n = 5, score = 2300 // 8b0d???????? | // 89480c | mov dword ptr [eax + 0xc], ecx // e9???????? | // 33c0 | xor eax, eax // e9???????? | $sequence_11 = { 50 e8???????? 56 e8???????? 83c414 8b4508 } // n = 6, score = 2000 // 50 | push eax // e8???????? | // 56 | push esi // e8???????? | // 83c414 | add esp, 0x14 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_12 = { 6a00 6840420f00 6a00 ff15???????? a3???????? } // n = 5, score = 2000 // 6a00 | push 0 // 6840420f00 | push 0xf4240 // 6a00 | push 0 // ff15???????? | // a3???????? | $sequence_13 = { 741e 57 56 6aff } // n = 4, score = 2000 // 741e | je 0x20 // 57 | push edi // 56 | push esi // 6aff | push -1 $sequence_14 = { 0f9fc3 e8???????? 83c414 5e } // n = 4, score = 2000 // 0f9fc3 | setg bl // e8???????? | // 83c414 | add esp, 0x14 // 5e | pop esi $sequence_15 = { 57 8d7c000c 57 e8???????? } // n = 4, score = 2000 // 57 | push edi // 8d7c000c | lea edi, [eax + eax + 0xc] // 57 | push edi // e8???????? | condition: 7 of them and filesize < 1335296 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY