Actor(s): APT 30
There is no description at this point.
rule win_backspace_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.backspace." 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.backspace" 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 = { 51 ff30 e8???????? 59 59 c3 55 } // n = 7, score = 100 // 51 | push ecx // ff30 | push dword ptr [eax] // e8???????? | // 59 | pop ecx // 59 | pop ecx // c3 | ret // 55 | push ebp $sequence_1 = { 6a0e 68???????? e8???????? 6a0e 68???????? e8???????? 6a09 } // n = 7, score = 100 // 6a0e | push 0xe // 68???????? | // e8???????? | // 6a0e | push 0xe // 68???????? | // e8???????? | // 6a09 | push 9 $sequence_2 = { 33c0 c3 55 8bec 81ec24010000 53 56 } // n = 7, score = 100 // 33c0 | xor eax, eax // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 81ec24010000 | sub esp, 0x124 // 53 | push ebx // 56 | push esi $sequence_3 = { 0fb6450b 83c410 ff85f0feffff 8a8405f8feffff 88450f } // n = 5, score = 100 // 0fb6450b | movzx eax, byte ptr [ebp + 0xb] // 83c410 | add esp, 0x10 // ff85f0feffff | inc dword ptr [ebp - 0x110] // 8a8405f8feffff | mov al, byte ptr [ebp + eax - 0x108] // 88450f | mov byte ptr [ebp + 0xf], al $sequence_4 = { 8d843578fdffff 50 e8???????? 8d8578ffffff 50 e8???????? 015dfc } // n = 7, score = 100 // 8d843578fdffff | lea eax, [ebp + esi - 0x288] // 50 | push eax // e8???????? | // 8d8578ffffff | lea eax, [ebp - 0x88] // 50 | push eax // e8???????? | // 015dfc | add dword ptr [ebp - 4], ebx $sequence_5 = { c6852bffffff37 c6852cffffff38 c6852dffffff39 c6852effffff3a } // n = 4, score = 100 // c6852bffffff37 | mov byte ptr [ebp - 0xd5], 0x37 // c6852cffffff38 | mov byte ptr [ebp - 0xd4], 0x38 // c6852dffffff39 | mov byte ptr [ebp - 0xd3], 0x39 // c6852effffff3a | mov byte ptr [ebp - 0xd2], 0x3a $sequence_6 = { 8be8 33db 3beb 0f84a8010000 } // n = 4, score = 100 // 8be8 | mov ebp, eax // 33db | xor ebx, ebx // 3beb | cmp ebp, ebx // 0f84a8010000 | je 0x1ae $sequence_7 = { 85c0 741b 395df8 7cc8 ff75fc } // n = 5, score = 100 // 85c0 | test eax, eax // 741b | je 0x1d // 395df8 | cmp dword ptr [ebp - 8], ebx // 7cc8 | jl 0xffffffca // ff75fc | push dword ptr [ebp - 4] $sequence_8 = { 8945e8 8d45e4 6a10 50 ff35???????? ff15???????? 8d45f4 } // n = 7, score = 100 // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8d45e4 | lea eax, [ebp - 0x1c] // 6a10 | push 0x10 // 50 | push eax // ff35???????? | // ff15???????? | // 8d45f4 | lea eax, [ebp - 0xc] $sequence_9 = { 59 8bc7 5f 5e c9 c3 833d????????00 } // n = 7, score = 100 // 59 | pop ecx // 8bc7 | mov eax, edi // 5f | pop edi // 5e | pop esi // c9 | leave // c3 | ret // 833d????????00 | condition: 7 of them and filesize < 131072 }
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