Actor(s): Lazarus Group
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rule win_sierras_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { c7060e000000 8b4640 85c0 8945f4 0f844ffeffff } // n = 5, score = 200 // c7060e000000 | mov dword ptr [esi], 0xe // 8b4640 | mov eax, dword ptr [esi + 0x40] // 85c0 | test eax, eax // 8945f4 | mov dword ptr [ebp - 0xc], eax // 0f844ffeffff | je 0xfffffe55 $sequence_2 = { 8bcd 8d442414 83e103 50 f3a4 8d4c241c 51 } // n = 7, score = 200 // 8bcd | mov ecx, ebp // 8d442414 | lea eax, [esp + 0x14] // 83e103 | and ecx, 3 // 50 | push eax // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8d4c241c | lea ecx, [esp + 0x1c] // 51 | push ecx $sequence_3 = { 56 ff7514 8d4de0 e8???????? 0175f0 017514 03fb } // n = 7, score = 200 // 56 | push esi // ff7514 | push dword ptr [ebp + 0x14] // 8d4de0 | lea ecx, [ebp - 0x20] // e8???????? | // 0175f0 | add dword ptr [ebp - 0x10], esi // 017514 | add dword ptr [ebp + 0x14], esi // 03fb | add edi, ebx $sequence_4 = { 8d45e0 50 e8???????? 6a00 56 ff7514 } // n = 6, score = 200 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // e8???????? | // 6a00 | push 0 // 56 | push esi // ff7514 | push dword ptr [ebp + 0x14] $sequence_5 = { 8bfa f3a5 8b0d???????? 83c260 48 } // n = 5, score = 200 // 8bfa | mov edi, edx // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8b0d???????? | // 83c260 | add edx, 0x60 // 48 | dec eax $sequence_6 = { 8b8698010000 5e c3 56 8bf1 } // n = 5, score = 200 // 8b8698010000 | mov eax, dword ptr [esi + 0x198] // 5e | pop esi // c3 | ret // 56 | push esi // 8bf1 | mov esi, ecx $sequence_7 = { 8b450c 7511 8b4dec 03c7 } // n = 4, score = 200 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 7511 | jne 0x13 // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 03c7 | add eax, edi $sequence_8 = { 6a78 56 8bcb e8???????? 85c0 } // n = 5, score = 200 // 6a78 | push 0x78 // 56 | push esi // 8bcb | mov ecx, ebx // e8???????? | // 85c0 | test eax, 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 = { 33db 895df0 e9???????? 8b4508 c74018acde4000 e9???????? 83ff10 } // n = 7, score = 200 // 33db | xor ebx, ebx // 895df0 | mov dword ptr [ebp - 0x10], ebx // e9???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // c74018acde4000 | mov dword ptr [eax + 0x18], 0x40deac // e9???????? | // 83ff10 | cmp edi, 0x10 $sequence_11 = { e8???????? 8bc6 5e 81c410010000 } // n = 4, score = 200 // e8???????? | // 8bc6 | mov eax, esi // 5e | pop esi // 81c410010000 | add esp, 0x110 $sequence_12 = { 8d542410 6a00 52 8d44242c 6a04 50 } // n = 6, score = 200 // 8d542410 | lea edx, [esp + 0x10] // 6a00 | push 0 // 52 | push edx // 8d44242c | lea eax, [esp + 0x2c] // 6a04 | push 4 // 50 | push eax $sequence_13 = { 0f8cc0000000 837d0801 7e58 837d0803 0f8fb0000000 397d10 } // n = 6, score = 200 // 0f8cc0000000 | jl 0xc6 // 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 $sequence_14 = { f3a4 8d8c2424050000 8d942430080000 51 52 53 e8???????? } // n = 7, score = 200 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8d8c2424050000 | lea ecx, [esp + 0x524] // 8d942430080000 | lea edx, [esp + 0x830] // 51 | push ecx // 52 | push edx // 53 | push ebx // e8???????? | 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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