Actor(s): VICEROY TIGER
There is no description at this point.
rule win_backconfig_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.backconfig." 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.backconfig" 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 = { 50 c745f498e14000 e8???????? cc 8bff 55 } // n = 6, score = 100 // 50 | push eax // c745f498e14000 | mov dword ptr [ebp - 0xc], 0x40e198 // e8???????? | // cc | int3 // 8bff | mov edi, edi // 55 | push ebp $sequence_1 = { 8d8d58ffffff 51 50 ff15???????? 6a00 6800008000 68???????? } // n = 7, score = 100 // 8d8d58ffffff | lea ecx, [ebp - 0xa8] // 51 | push ecx // 50 | push eax // ff15???????? | // 6a00 | push 0 // 6800008000 | push 0x800000 // 68???????? | $sequence_2 = { 75f9 2bc6 3bc8 72e1 6a00 } // n = 5, score = 100 // 75f9 | jne 0xfffffffb // 2bc6 | sub eax, esi // 3bc8 | cmp ecx, eax // 72e1 | jb 0xffffffe3 // 6a00 | push 0 $sequence_3 = { 817de080e14000 7311 8b45e0 8b00 85c0 } // n = 5, score = 100 // 817de080e14000 | cmp dword ptr [ebp - 0x20], 0x40e180 // 7311 | jae 0x13 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax $sequence_4 = { 0f8d3b010000 8b34bdc0504100 85f6 0f84b9000000 8975e0 } // n = 5, score = 100 // 0f8d3b010000 | jge 0x141 // 8b34bdc0504100 | mov esi, dword ptr [edi*4 + 0x4150c0] // 85f6 | test esi, esi // 0f84b9000000 | je 0xbf // 8975e0 | mov dword ptr [ebp - 0x20], esi $sequence_5 = { 8d34c550224100 833e00 7513 50 e8???????? 59 85c0 } // n = 7, score = 100 // 8d34c550224100 | lea esi, [eax*8 + 0x412250] // 833e00 | cmp dword ptr [esi], 0 // 7513 | jne 0x15 // 50 | push eax // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax $sequence_6 = { 83e61f c1e606 033485c0504100 c745e401000000 33db } // n = 5, score = 100 // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 033485c0504100 | add esi, dword ptr [eax*4 + 0x4150c0] // c745e401000000 | mov dword ptr [ebp - 0x1c], 1 // 33db | xor ebx, ebx $sequence_7 = { c1f805 8d1485c0504100 8b0a 83e61f c1e606 03ce } // n = 6, score = 100 // c1f805 | sar eax, 5 // 8d1485c0504100 | lea edx, [eax*4 + 0x4150c0] // 8b0a | mov ecx, dword ptr [edx] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 03ce | add ecx, esi $sequence_8 = { 7229 f3a5 ff249530714000 8bc7 ba03000000 83e904 } // n = 6, score = 100 // 7229 | jb 0x2b // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff249530714000 | jmp dword ptr [edx*4 + 0x407130] // 8bc7 | mov eax, edi // ba03000000 | mov edx, 3 // 83e904 | sub ecx, 4 $sequence_9 = { ebd5 8bc8 c1f905 8b0c8dc0504100 83e01f } // n = 5, score = 100 // ebd5 | jmp 0xffffffd7 // 8bc8 | mov ecx, eax // c1f905 | sar ecx, 5 // 8b0c8dc0504100 | mov ecx, dword ptr [ecx*4 + 0x4150c0] // 83e01f | and eax, 0x1f condition: 7 of them and filesize < 217088 }
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