There is no description at this point.
rule win_vskimmer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.vskimmer." 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.vskimmer" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 ffb598fbffff 8d8d28fbffff e8???????? } // n = 4, score = 100 // 50 | push eax // ffb598fbffff | push dword ptr [ebp - 0x468] // 8d8d28fbffff | lea ecx, [ebp - 0x4d8] // e8???????? | $sequence_1 = { 53 ff750c ff4508 ff7508 8d85acfdffff 50 8d8db4fdffff } // n = 7, score = 100 // 53 | push ebx // ff750c | push dword ptr [ebp + 0xc] // ff4508 | inc dword ptr [ebp + 8] // ff7508 | push dword ptr [ebp + 8] // 8d85acfdffff | lea eax, [ebp - 0x254] // 50 | push eax // 8d8db4fdffff | lea ecx, [ebp - 0x24c] $sequence_2 = { 8d85ecfeffff 50 8d8d80faffff e8???????? 8b8530fbffff 2b852cfbffff } // n = 6, score = 100 // 8d85ecfeffff | lea eax, [ebp - 0x114] // 50 | push eax // 8d8d80faffff | lea ecx, [ebp - 0x580] // e8???????? | // 8b8530fbffff | mov eax, dword ptr [ebp - 0x4d0] // 2b852cfbffff | sub eax, dword ptr [ebp - 0x4d4] $sequence_3 = { 7513 b001 e9???????? 8933 897b04 32c0 e9???????? } // n = 7, score = 100 // 7513 | jne 0x15 // b001 | mov al, 1 // e9???????? | // 8933 | mov dword ptr [ebx], esi // 897b04 | mov dword ptr [ebx + 4], edi // 32c0 | xor al, al // e9???????? | $sequence_4 = { e8???????? ff7508 8b10 8bc8 ff5208 8b4e10 884508 } // n = 7, score = 100 // e8???????? | // ff7508 | push dword ptr [ebp + 8] // 8b10 | mov edx, dword ptr [eax] // 8bc8 | mov ecx, eax // ff5208 | call dword ptr [edx + 8] // 8b4e10 | mov ecx, dword ptr [esi + 0x10] // 884508 | mov byte ptr [ebp + 8], al $sequence_5 = { 56 8b7508 85f6 741b 57 8bfe ff770c } // n = 7, score = 100 // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 85f6 | test esi, esi // 741b | je 0x1d // 57 | push edi // 8bfe | mov edi, esi // ff770c | push dword ptr [edi + 0xc] $sequence_6 = { 2b4510 8b4d0c 3bc8 7202 8bc8 837e1410 7204 } // n = 7, score = 100 // 2b4510 | sub eax, dword ptr [ebp + 0x10] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 3bc8 | cmp ecx, eax // 7202 | jb 4 // 8bc8 | mov ecx, eax // 837e1410 | cmp dword ptr [esi + 0x14], 0x10 // 7204 | jb 6 $sequence_7 = { e8???????? 8bce 5e e9???????? 55 8bec 8b4120 } // n = 7, score = 100 // e8???????? | // 8bce | mov ecx, esi // 5e | pop esi // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp // 8b4120 | mov eax, dword ptr [ecx + 0x20] $sequence_8 = { 897de8 895de4 885dd4 e8???????? c745fc01000000 ebb0 6a0f } // n = 7, score = 100 // 897de8 | mov dword ptr [ebp - 0x18], edi // 895de4 | mov dword ptr [ebp - 0x1c], ebx // 885dd4 | mov byte ptr [ebp - 0x2c], bl // e8???????? | // c745fc01000000 | mov dword ptr [ebp - 4], 1 // ebb0 | jmp 0xffffffb2 // 6a0f | push 0xf $sequence_9 = { 33d2 42 d3e2 8b4f04 } // n = 4, score = 100 // 33d2 | xor edx, edx // 42 | inc edx // d3e2 | shl edx, cl // 8b4f04 | mov ecx, dword ptr [edi + 4] condition: 7 of them and filesize < 376832 }
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