Actor(s): Lazarus Group
This family contains the BlueNoroff toolkit used for SWIFT manipulation, as used by the Lazarus activity cluster also referred to as BlueNoroff.
rule win_bluenoroff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bluenoroff." 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.bluenoroff" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 83f802 750e 8d95fcfffeff 52 68???????? } // n = 5, score = 300 // 83f802 | cmp eax, 2 // 750e | jne 0x10 // 8d95fcfffeff | lea edx, [ebp - 0x10004] // 52 | push edx // 68???????? | $sequence_1 = { 8d8df8feffff 51 ff15???????? 0fbe95f8feffff 68???????? } // n = 5, score = 300 // 8d8df8feffff | lea ecx, [ebp - 0x108] // 51 | push ecx // ff15???????? | // 0fbe95f8feffff | movsx edx, byte ptr [ebp - 0x108] // 68???????? | $sequence_2 = { 85f6 743a 8d85fcfffeff 50 } // n = 4, score = 300 // 85f6 | test esi, esi // 743a | je 0x3c // 8d85fcfffeff | lea eax, [ebp - 0x10004] // 50 | push eax $sequence_3 = { 894e04 e8???????? 83c40c 5f } // n = 4, score = 300 // 894e04 | mov dword ptr [esi + 4], ecx // e8???????? | // 83c40c | add esp, 0xc // 5f | pop edi $sequence_4 = { eb10 85c0 7514 8d85fcfffeff 50 68???????? } // n = 6, score = 300 // eb10 | jmp 0x12 // 85c0 | test eax, eax // 7514 | jne 0x16 // 8d85fcfffeff | lea eax, [ebp - 0x10004] // 50 | push eax // 68???????? | $sequence_5 = { 83feff 7433 8d4e01 51 6a40 } // n = 5, score = 300 // 83feff | cmp esi, -1 // 7433 | je 0x35 // 8d4e01 | lea ecx, [esi + 1] // 51 | push ecx // 6a40 | push 0x40 $sequence_6 = { 68ffff0000 50 e8???????? 33c0 } // n = 4, score = 300 // 68ffff0000 | push 0xffff // 50 | push eax // e8???????? | // 33c0 | xor eax, eax $sequence_7 = { 56 6a10 68???????? e8???????? 83c410 813ed0c0b0a0 } // n = 6, score = 300 // 56 | push esi // 6a10 | push 0x10 // 68???????? | // e8???????? | // 83c410 | add esp, 0x10 // 813ed0c0b0a0 | cmp dword ptr [esi], 0xa0b0c0d0 $sequence_8 = { 33ff 53 ff15???????? 8b450c 85c0 7402 } // n = 6, score = 300 // 33ff | xor edi, edi // 53 | push ebx // ff15???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] // 85c0 | test eax, eax // 7402 | je 4 $sequence_9 = { 50 0fb785f4fffeff 51 52 } // n = 4, score = 300 // 50 | push eax // 0fb785f4fffeff | movzx eax, word ptr [ebp - 0x1000c] // 51 | push ecx // 52 | push edx condition: 7 of them and filesize < 303104 }
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