There is no description at this point.
rule win_vskimmer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 5f 8bce 5e e9???????? 55 8bec ff7510 } // n = 7, score = 100 // 5f | pop edi // 8bce | mov ecx, esi // 5e | pop esi // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp // ff7510 | push dword ptr [ebp + 0x10] $sequence_1 = { ff33 8bcb e8???????? 6a00 } // n = 4, score = 100 // ff33 | push dword ptr [ebx] // 8bcb | mov ecx, ebx // e8???????? | // 6a00 | push 0 $sequence_2 = { ebe3 5d c3 55 8bec 51 8b550c } // n = 7, score = 100 // ebe3 | jmp 0xffffffe5 // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_3 = { 83f803 7423 66837e3c00 7507 57 e8???????? 59 } // n = 7, score = 100 // 83f803 | cmp eax, 3 // 7423 | je 0x25 // 66837e3c00 | cmp word ptr [esi + 0x3c], 0 // 7507 | jne 9 // 57 | push edi // e8???????? | // 59 | pop ecx $sequence_4 = { 750b 6a08 58 6689413c b001 eb02 32c0 } // n = 7, score = 100 // 750b | jne 0xd // 6a08 | push 8 // 58 | pop eax // 6689413c | mov word ptr [ecx + 0x3c], ax // b001 | mov al, 1 // eb02 | jmp 4 // 32c0 | xor al, al $sequence_5 = { 8b471c 0f95c2 0fb6d2 52 8b55fc ffb220020000 8d5001 } // n = 7, score = 100 // 8b471c | mov eax, dword ptr [edi + 0x1c] // 0f95c2 | setne dl // 0fb6d2 | movzx edx, dl // 52 | push edx // 8b55fc | mov edx, dword ptr [ebp - 4] // ffb220020000 | push dword ptr [edx + 0x220] // 8d5001 | lea edx, [eax + 1] $sequence_6 = { 8bcc 89a5c0f6ffff 50 e8???????? 57 e9???????? } // n = 6, score = 100 // 8bcc | mov ecx, esp // 89a5c0f6ffff | mov dword ptr [ebp - 0x940], esp // 50 | push eax // e8???????? | // 57 | push edi // e9???????? | $sequence_7 = { 57 751c 83791801 7416 } // n = 4, score = 100 // 57 | push edi // 751c | jne 0x1e // 83791801 | cmp dword ptr [ecx + 0x18], 1 // 7416 | je 0x18 $sequence_8 = { 46 8bc6 6bc00c 8d8848d44100 833900 } // n = 5, score = 100 // 46 | inc esi // 8bc6 | mov eax, esi // 6bc00c | imul eax, eax, 0xc // 8d8848d44100 | lea ecx, [eax + 0x41d448] // 833900 | cmp dword ptr [ecx], 0 $sequence_9 = { eb02 33c0 88862b020000 898e2c020000 898e30020000 8d8e34020000 } // n = 6, score = 100 // eb02 | jmp 4 // 33c0 | xor eax, eax // 88862b020000 | mov byte ptr [esi + 0x22b], al // 898e2c020000 | mov dword ptr [esi + 0x22c], ecx // 898e30020000 | mov dword ptr [esi + 0x230], ecx // 8d8e34020000 | lea ecx, [esi + 0x234] 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