Actor(s): Lazarus Group
There is no description at this point.
rule win_sierras_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" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sierras" 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 = { c705????????07000000 8935???????? 8935???????? 8935???????? 8935???????? ff15???????? 3bc6 } // n = 7, score = 400 // c705????????07000000 | // 8935???????? | // 8935???????? | // 8935???????? | // 8935???????? | // ff15???????? | // 3bc6 | cmp eax, esi $sequence_1 = { 57 57 8d8c2448020000 57 51 c744247000000000 } // n = 6, score = 200 // 57 | push edi // 57 | push edi // 8d8c2448020000 | lea ecx, [esp + 0x248] // 57 | push edi // 51 | push ecx // c744247000000000 | mov dword ptr [esp + 0x70], 0 $sequence_2 = { 8b45f0 3b4510 72c3 eb62 837d1000 } // n = 5, score = 200 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 3b4510 | cmp eax, dword ptr [ebp + 0x10] // 72c3 | jb 0xffffffc5 // eb62 | jmp 0x64 // 837d1000 | cmp dword ptr [ebp + 0x10], 0 $sequence_3 = { 53 53 8d442428 53 50 ffd7 85c0 } // n = 7, score = 200 // 53 | push ebx // 53 | push ebx // 8d442428 | lea eax, [esp + 0x28] // 53 | push ebx // 50 | push eax // ffd7 | call edi // 85c0 | test eax, eax $sequence_4 = { 7d0d 6a13 50 57 ff15???????? 83c40c } // n = 6, score = 200 // 7d0d | jge 0xf // 6a13 | push 0x13 // 50 | push eax // 57 | push edi // ff15???????? | // 83c40c | add esp, 0xc $sequence_5 = { f3ab 8bce aa e8???????? } // n = 4, score = 200 // f3ab | rep stosd dword ptr es:[edi], eax // 8bce | mov ecx, esi // aa | stosb byte ptr es:[edi], al // e8???????? | $sequence_6 = { e8???????? 8b8608010000 5e c3 56 } // n = 5, score = 200 // e8???????? | // 8b8608010000 | mov eax, dword ptr [esi + 0x108] // 5e | pop esi // c3 | ret // 56 | push esi $sequence_7 = { 8bf1 e8???????? 8b8698010000 5e } // n = 4, score = 200 // 8bf1 | mov esi, ecx // e8???????? | // 8b8698010000 | mov eax, dword ptr [esi + 0x198] // 5e | pop esi $sequence_8 = { 8bf1 57 68???????? 8d4604 50 ff15???????? 8bf8 } // n = 7, score = 200 // 8bf1 | mov esi, ecx // 57 | push edi // 68???????? | // 8d4604 | lea eax, [esi + 4] // 50 | push eax // ff15???????? | // 8bf8 | mov edi, eax $sequence_9 = { 8bf1 33db 6a01 6a78 } // n = 4, score = 200 // 8bf1 | mov esi, ecx // 33db | xor ebx, ebx // 6a01 | push 1 // 6a78 | push 0x78 $sequence_10 = { be0a000000 3bc6 7c10 6a64 ff15???????? } // n = 5, score = 200 // be0a000000 | mov esi, 0xa // 3bc6 | cmp eax, esi // 7c10 | jl 0x12 // 6a64 | push 0x64 // ff15???????? | $sequence_11 = { 7520 f6c140 0f85bc010000 6a01 5a d3e2 0fb74df2 } // n = 7, score = 200 // 7520 | jne 0x22 // f6c140 | test cl, 0x40 // 0f85bc010000 | jne 0x1c2 // 6a01 | push 1 // 5a | pop edx // d3e2 | shl edx, cl // 0fb74df2 | movzx ecx, word ptr [ebp - 0xe] $sequence_12 = { 895db4 6a38 f3ab 8d45b4 } // n = 4, score = 200 // 895db4 | mov dword ptr [ebp - 0x4c], ebx // 6a38 | push 0x38 // f3ab | rep stosd dword ptr es:[edi], eax // 8d45b4 | lea eax, [ebp - 0x4c] $sequence_13 = { 837df800 0f84ce020000 8b45fc 8bcf } // n = 4, score = 200 // 837df800 | cmp dword ptr [ebp - 8], 0 // 0f84ce020000 | je 0x2d4 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8bcf | mov ecx, edi $sequence_14 = { 750b c70617000000 e9???????? a820 0f850af9ffff } // n = 5, score = 200 // 750b | jne 0xd // c70617000000 | mov dword ptr [esi], 0x17 // e9???????? | // a820 | test al, 0x20 // 0f850af9ffff | jne 0xfffff910 condition: 7 of them and filesize < 131072 }
import "pe" rule win_sierras_w0 { meta: copyright = "2015 Novetta Solutions" author = "Novetta Threat Research & Interdiction Group - trig@novetta.com" info = "charlie component" hash = "f4750e1d82b08318bdc1eb6d3399dee52750250f7959a5e4f83245449f399698.bin" source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/SierraCharlie.yar" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sierras" malpedia_version = "20170517" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: /* 8B 0D 50 A7 56 00 mov ecx, DnsFree 81 F6 8C 3F 7C 5E xor esi, 5E7C3F8Ch 6A 01 push 1 ; _DWORD 50 push eax ; _DWORD 85 C9 test ecx, ecx 74 3A jz short loc_40580B FF D1 call ecx ; DnsFree */ $dnsResolve = { 8B 0D 50 A7 56 00 81 F6 8C 3F 7C 5E 6A 01 50 85 C9 74 3A FF D1 } $file1 = "wmplog21t.sqm" $file2 = "wmplog15r.sqm" $file3 = "wmplog09c.sqm" condition: $dnsResolve in ((pe.sections[pe.section_index(".text")].raw_data_offset)..(pe.sections[pe.section_index(".text")].raw_data_offset + pe.sections[pe.section_index(".text")].raw_data_size)) or 2 of ($file*) }
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