Ransomware.
rule win_leakthemall_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.leakthemall" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { e9???????? 4889742420 4c89442410 0f57c0 0f11442440 48c744245000000000 488d0d74a70200 } // n = 7, score = 100 // e9???????? | // 4889742420 | dec eax // 4c89442410 | mov ecx, dword ptr [edx + 0x28] // 0f57c0 | dec eax // 0f11442440 | mov ebx, dword ptr [edx + 0x20] // 48c744245000000000 | dec eax // 488d0d74a70200 | mov dword ptr [esp], eax $sequence_1 = { c3 c68424f000000000 488bac24c8000000 4881c4d0000000 c3 488b442450 488b4c2470 } // n = 7, score = 100 // c3 | mov eax, dword ptr [eax + 8] // c68424f000000000 | xorps xmm0, xmm0 // 488bac24c8000000 | movups xmmword ptr [esp + 0x40], xmm0 // 4881c4d0000000 | dec eax // c3 | mov dword ptr [esp + 0x40], eax // 488b442450 | dec eax // 488b4c2470 | mov dword ptr [esp + 0x48], ecx $sequence_2 = { 488bb42488000000 4889742440 e8???????? 488b442448 4885c0 7474 488b9c2490000000 } // n = 7, score = 100 // 488bb42488000000 | dec eax // 4889742440 | test eax, eax // e8???????? | // 488b442448 | je 0x1f3 // 4885c0 | dec ecx // 7474 | mov eax, ebx // 488b9c2490000000 | dec eax $sequence_3 = { c4c1496df7 c441096cfe c4c1416dff c57a7e6648 c57a7e6e10 c57a7e36 c57a7e7e20 } // n = 7, score = 100 // c4c1496df7 | call eax // c441096cfe | dec eax // c4c1416dff | mov eax, dword ptr [esp + 8] // c57a7e6648 | dec eax // c57a7e6e10 | mov ecx, dword ptr [esp + 0x10] // c57a7e36 | dec eax // c57a7e7e20 | mov eax, dword ptr [eax + 0x28] $sequence_4 = { f20f5ec1 f20f100d???????? f20f59c8 f20f10542450 660f2ed1 0f86de010000 f20f1015???????? } // n = 7, score = 100 // f20f5ec1 | dec eax // f20f100d???????? | // f20f59c8 | mov dword ptr [esp + 0x58], edx // f20f10542450 | dec eax // 660f2ed1 | mov ebp, dword ptr [esp + 0x30] // 0f86de010000 | dec eax // f20f1015???????? | $sequence_5 = { e9???????? 488b4c2418 488d7930 e8???????? 488b542440 488d7a18 4889c8 } // n = 7, score = 100 // e9???????? | // 488b4c2418 | lea edx, [0x100157] // 488d7930 | dec eax // e8???????? | // 488b542440 | cmp ecx, edx // 488d7a18 | jne 0x19d5 // 4889c8 | mov word ptr [eax + 0xb2], 0 $sequence_6 = { e8???????? 0fb7442416 0fb7c0 48890424 e8???????? 488d050ef51d00 48890424 } // n = 7, score = 100 // e8???????? | // 0fb7442416 | dec eax // 0fb7c0 | mov dword ptr [eax + 8], 0x1a // 48890424 | dec eax // e8???????? | // 488d050ef51d00 | lea ecx, [0x12055d] // 48890424 | dec eax $sequence_7 = { e8???????? 488b442418 ebc7 48c744244800000000 488b6c2420 4883c428 c3 } // n = 7, score = 100 // e8???????? | // 488b442418 | mov eax, dword ptr [eax] // ebc7 | dec eax // 48c744244800000000 | mov dword ptr [esp + 0x38], eax // 488b6c2420 | dec eax // 4883c428 | mov eax, dword ptr [esp + 0x20] // c3 | dec eax $sequence_8 = { e9???????? 4889542470 4c89442468 488d0558020f00 48890424 48895c2408 4889742410 } // n = 7, score = 100 // e9???????? | // 4889542470 | dec eax // 4c89442468 | mov ebx, dword ptr [eax + 0x28] // 488d0558020f00 | dec eax // 48890424 | mov esi, dword ptr [edx + 0x28] // 48895c2408 | dec eax // 4889742410 | cmp dword ptr [eax + 0x20], ecx $sequence_9 = { 488d0d65dd0100 48898c2480000000 4889842488000000 488b05???????? 48890424 488d050acd0500 4889442408 } // n = 7, score = 100 // 488d0d65dd0100 | dec eax // 48898c2480000000 | mov dword ptr [esp + 8], 7 // 4889842488000000 | dec eax // 488b05???????? | // 48890424 | mov eax, dword ptr [esp + 0x50] // 488d050acd0500 | dec eax // 4889442408 | mov dword ptr [esp], eax condition: 7 of them and filesize < 10363904 }
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