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 = "2022-11-21" version = "1" description = "Detects win.sierras." 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.sierras" malpedia_rule_date = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { e8???????? 6a00 56 ff7514 8d4de0 } // n = 5, score = 200 // e8???????? | // 6a00 | push 0 // 56 | push esi // ff7514 | push dword ptr [ebp + 0x14] // 8d4de0 | lea ecx, [ebp - 0x20] $sequence_2 = { 33049dc09d4000 8bd9 c1eb18 33049dc0954000 23ce 33db 836d1020 } // n = 7, score = 200 // 33049dc09d4000 | xor eax, dword ptr [ebx*4 + 0x409dc0] // 8bd9 | mov ebx, ecx // c1eb18 | shr ebx, 0x18 // 33049dc0954000 | xor eax, dword ptr [ebx*4 + 0x4095c0] // 23ce | and ecx, esi // 33db | xor ebx, ebx // 836d1020 | sub dword ptr [ebp + 0x10], 0x20 $sequence_3 = { c706???????? 50 ff15???????? 8d4e04 e8???????? 5e } // n = 6, score = 200 // c706???????? | // 50 | push eax // ff15???????? | // 8d4e04 | lea ecx, [esi + 4] // e8???????? | // 5e | pop esi $sequence_4 = { 83c408 3bf5 7414 56 57 e8???????? 83c604 } // n = 7, score = 200 // 83c408 | add esp, 8 // 3bf5 | cmp esi, ebp // 7414 | je 0x16 // 56 | push esi // 57 | push edi // e8???????? | // 83c604 | add esi, 4 $sequence_5 = { 50 6802020000 668935???????? e8???????? 85c0 } // n = 5, score = 200 // 50 | push eax // 6802020000 | push 0x202 // 668935???????? | // e8???????? | // 85c0 | test eax, eax $sequence_6 = { 33c0 85c0 7e15 8bf0 8bcf e8???????? } // n = 6, score = 200 // 33c0 | xor eax, eax // 85c0 | test eax, eax // 7e15 | jle 0x17 // 8bf0 | mov esi, eax // 8bcf | mov ecx, edi // e8???????? | $sequence_7 = { 837d0801 7e58 837d0803 0f8fb0000000 397d10 897df0 0f86a4000000 } // n = 7, score = 200 // 837d0801 | cmp dword ptr [ebp + 8], 1 // 7e58 | jle 0x5a // 837d0803 | cmp dword ptr [ebp + 8], 3 // 0f8fb0000000 | jg 0xb6 // 397d10 | cmp dword ptr [ebp + 0x10], edi // 897df0 | mov dword ptr [ebp - 0x10], edi // 0f86a4000000 | jbe 0xaa $sequence_8 = { c3 56 8bf1 e8???????? 8b8698010000 5e c3 } // n = 7, score = 200 // c3 | ret // 56 | push esi // 8bf1 | mov esi, ecx // e8???????? | // 8b8698010000 | mov eax, dword ptr [esi + 0x198] // 5e | pop esi // c3 | ret $sequence_9 = { e8???????? 83c430 683f000f00 6a00 6a00 ff15???????? 8bf0 } // n = 7, score = 200 // e8???????? | // 83c430 | add esp, 0x30 // 683f000f00 | push 0xf003f // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 8bf0 | mov esi, eax $sequence_10 = { 56 8bf1 57 8d7e08 57 ff15???????? 83f8ff } // n = 7, score = 200 // 56 | push esi // 8bf1 | mov esi, ecx // 57 | push edi // 8d7e08 | lea edi, [esi + 8] // 57 | push edi // ff15???????? | // 83f8ff | cmp eax, -1 $sequence_11 = { 85ff 0f84da030000 85db 0f84d2030000 8b2d???????? 83c9ff } // n = 6, score = 200 // 85ff | test edi, edi // 0f84da030000 | je 0x3e0 // 85db | test ebx, ebx // 0f84d2030000 | je 0x3d8 // 8b2d???????? | // 83c9ff | or ecx, 0xffffffff $sequence_12 = { 7422 8d50a0 85c0 7411 } // n = 4, score = 200 // 7422 | je 0x24 // 8d50a0 | lea edx, [eax - 0x60] // 85c0 | test eax, eax // 7411 | je 0x13 $sequence_13 = { 894c2420 c744242400000000 e8???????? 33c9 56 } // n = 5, score = 200 // 894c2420 | mov dword ptr [esp + 0x20], ecx // c744242400000000 | mov dword ptr [esp + 0x24], 0 // e8???????? | // 33c9 | xor ecx, ecx // 56 | push esi $sequence_14 = { 8910 83c004 3bc1 75f3 eb43 50 50 } // n = 7, score = 200 // 8910 | mov dword ptr [eax], edx // 83c004 | add eax, 4 // 3bc1 | cmp eax, ecx // 75f3 | jne 0xfffffff5 // eb43 | jmp 0x45 // 50 | push eax // 50 | push eax 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" 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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