Actor(s): Lazarus Group
There is no description at this point.
rule win_pslogger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.pslogger." 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.pslogger" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { e8???????? 33d2 41b8b80b0000 498bcc } // n = 4, score = 400 // e8???????? | // 33d2 | dec eax // 41b8b80b0000 | cmp ecx, eax // 498bcc | je 0x17 $sequence_1 = { 488b19 488bf9 483b5908 7418 488b0b } // n = 5, score = 400 // 488b19 | dec eax // 488bf9 | mov ebx, dword ptr [ecx] // 483b5908 | dec eax // 7418 | mov edi, ecx // 488b0b | dec eax $sequence_2 = { 488b0e 483bc8 740e 4885c9 } // n = 4, score = 400 // 488b0e | dec eax // 483bc8 | sub esp, 0x28 // 740e | jne 0x17 // 4885c9 | nop dword ptr [eax] $sequence_3 = { 4883ec28 803d????????00 7511 0f1f00 e8???????? 803d????????00 74f2 } // n = 7, score = 400 // 4883ec28 | mov ecx, dword ptr [ebx] // 803d????????00 | // 7511 | test ax, ax // 0f1f00 | jns 0x15 // e8???????? | // 803d????????00 | // 74f2 | mov ecx, 0x14 $sequence_4 = { ff15???????? b801000000 488b8c2488000000 4833cc } // n = 4, score = 400 // ff15???????? | // b801000000 | mov dword ptr [esi], ebx // 488b8c2488000000 | jne 0x13 // 4833cc | nop dword ptr [eax] $sequence_5 = { e8???????? 8bc8 e8???????? 85c0 743b 4863f0 } // n = 6, score = 400 // e8???????? | // 8bc8 | je 0xfffffff4 // e8???????? | // 85c0 | dec eax // 743b | mov ecx, dword ptr [esi] // 4863f0 | dec eax $sequence_6 = { 4885c0 7463 488bc8 e8???????? 8bc8 } // n = 5, score = 400 // 4885c0 | jns 0x12 // 7463 | mov ecx, 0x14 // 488bc8 | jne 0x13 // e8???????? | // 8bc8 | nop dword ptr [eax] $sequence_7 = { ff15???????? 6685c0 7910 b914000000 } // n = 4, score = 400 // ff15???????? | // 6685c0 | cmp ebx, dword ptr [ecx + 8] // 7910 | je 0x1a // b914000000 | dec eax $sequence_8 = { 2bca c705????????00000000 890d???????? 8bce 8d5101 } // n = 5, score = 100 // 2bca | je 0x2c // c705????????00000000 | // 890d???????? | // 8bce | dec eax // 8d5101 | test ecx, ecx $sequence_9 = { 757f 8b7c2438 8b35???????? ff442424 53 } // n = 5, score = 100 // 757f | je 0xfffffff7 // 8b7c2438 | xor eax, eax // 8b35???????? | // ff442424 | int3 // 53 | dec eax $sequence_10 = { 751f c7431400000002 b800000002 5f 5e 5b 8b4dfc } // n = 7, score = 100 // 751f | dec eax // c7431400000002 | test eax, eax // b800000002 | je 0x74 // 5f | dec eax // 5e | mov ecx, eax // 5b | mov ecx, eax // 8b4dfc | dec eax $sequence_11 = { c745f8ffffffff 53 56 33f6 8945fc 0fb75002 57 } // n = 7, score = 100 // c745f8ffffffff | test ecx, ecx // 53 | je 0x13 // 56 | dec eax // 33f6 | sub esp, 0x20 // 8945fc | dec eax // 0fb75002 | mov ebx, dword ptr [ecx] // 57 | dec eax $sequence_12 = { 8bbde4feffff 8bcf e8???????? 53 } // n = 4, score = 100 // 8bbde4feffff | mov ecx, dword ptr [esi] // 8bcf | dec eax // e8???????? | // 53 | cmp ecx, eax $sequence_13 = { 8bf1 c745ec00000000 c745fc00000000 c745f000000000 c645fc01 8d4dd4 } // n = 6, score = 100 // 8bf1 | mov ecx, dword ptr [ebx] // c745ec00000000 | dec eax // c745fc00000000 | cmp ecx, eax // c745f000000000 | je 0x17 // c645fc01 | dec eax // 8d4dd4 | test ecx, ecx $sequence_14 = { 8b049d88b14200 8b4de0 f644082801 7515 e8???????? c70009000000 } // n = 6, score = 100 // 8b049d88b14200 | mov ecx, dword ptr [esi] // 8b4de0 | dec eax // f644082801 | cmp ecx, eax // 7515 | je 0x16 // e8???????? | // c70009000000 | dec eax $sequence_15 = { 46 897508 83e801 7597 5f } // n = 5, score = 100 // 46 | je 0x29 // 897508 | dec eax // 83e801 | mov dword ptr [esi], ebx // 7597 | jne 0x13 // 5f | nop dword ptr [eax] condition: 7 of them and filesize < 475136 }
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