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 = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sierras" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" 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 / approach 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 = { e8???????? 8bd8 83c408 85db 7430 } // n = 5, score = 200 // e8???????? | // 8bd8 | mov ebx, eax // 83c408 | add esp, 8 // 85db | test ebx, ebx // 7430 | je 0x32 $sequence_2 = { e8???????? 8b8698010000 5e c3 56 8bf1 e8???????? } // n = 7, score = 200 // e8???????? | // 8b8698010000 | mov eax, dword ptr [esi + 0x198] // 5e | pop esi // c3 | ret // 56 | push esi // 8bf1 | mov esi, ecx // e8???????? | $sequence_3 = { 8bf1 57 68???????? 8d8608020000 50 } // n = 5, score = 200 // 8bf1 | mov esi, ecx // 57 | push edi // 68???????? | // 8d8608020000 | lea eax, [esi + 0x208] // 50 | push eax $sequence_4 = { 895db8 8945c0 8975c4 0f84d8000000 3bc3 0f84d0000000 } // n = 6, score = 200 // 895db8 | mov dword ptr [ebp - 0x48], ebx // 8945c0 | mov dword ptr [ebp - 0x40], eax // 8975c4 | mov dword ptr [ebp - 0x3c], esi // 0f84d8000000 | je 0xde // 3bc3 | cmp eax, ebx // 0f84d0000000 | je 0xd6 $sequence_5 = { 8945f4 7624 837df800 0f842a030000 8b45fc ff4df8 8bcf } // n = 7, score = 200 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 7624 | jbe 0x26 // 837df800 | cmp dword ptr [ebp - 8], 0 // 0f842a030000 | je 0x330 // 8b45fc | mov eax, dword ptr [ebp - 4] // ff4df8 | dec dword ptr [ebp - 8] // 8bcf | mov ecx, edi $sequence_6 = { 85c0 7e15 8bf0 8bcf e8???????? 8b4f04 } // n = 6, score = 200 // 85c0 | test eax, eax // 7e15 | jle 0x17 // 8bf0 | mov esi, eax // 8bcf | mov ecx, edi // e8???????? | // 8b4f04 | mov ecx, dword ptr [edi + 4] $sequence_7 = { f6461108 7478 837df800 0f843e0c0000 } // n = 4, score = 200 // f6461108 | test byte ptr [esi + 0x11], 8 // 7478 | je 0x7a // 837df800 | cmp dword ptr [ebp - 8], 0 // 0f843e0c0000 | je 0xc44 $sequence_8 = { 8b450c 7511 8b4dec 03c7 50 8d45e0 50 } // n = 7, score = 200 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 7511 | jne 0x13 // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 03c7 | add eax, edi // 50 | push eax // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax $sequence_9 = { 0175f0 017514 03fb 3b7d10 72b0 8b5df0 834dfcff } // n = 7, score = 200 // 0175f0 | add dword ptr [ebp - 0x10], esi // 017514 | add dword ptr [ebp + 0x14], esi // 03fb | add edi, ebx // 3b7d10 | cmp edi, dword ptr [ebp + 0x10] // 72b0 | jb 0xffffffb2 // 8b5df0 | mov ebx, dword ptr [ebp - 0x10] // 834dfcff | or dword ptr [ebp - 4], 0xffffffff $sequence_10 = { e8???????? 83c430 683f000f00 6a00 6a00 ff15???????? } // n = 6, score = 200 // e8???????? | // 83c430 | add esp, 0x30 // 683f000f00 | push 0xf003f // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | $sequence_11 = { 3908 7509 394804 0f8523110000 } // n = 4, score = 200 // 3908 | cmp dword ptr [eax], ecx // 7509 | jne 0xb // 394804 | cmp dword ptr [eax + 4], ecx // 0f8523110000 | jne 0x1129 $sequence_12 = { 8bf1 33db 6a01 6a78 } // n = 4, score = 200 // 8bf1 | mov esi, ecx // 33db | xor ebx, ebx // 6a01 | push 1 // 6a78 | push 0x78 $sequence_13 = { 8d842428060000 50 51 52 53 e8???????? } // n = 6, score = 200 // 8d842428060000 | lea eax, [esp + 0x628] // 50 | push eax // 51 | push ecx // 52 | push edx // 53 | push ebx // e8???????? | $sequence_14 = { 85c0 7439 3bf8 7321 837df800 0f844a020000 } // n = 6, score = 200 // 85c0 | test eax, eax // 7439 | je 0x3b // 3bf8 | cmp edi, eax // 7321 | jae 0x23 // 837df800 | cmp dword ptr [ebp - 8], 0 // 0f844a020000 | je 0x250 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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