Actor(s): FIN8
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rule win_poslurp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.poslurp." 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.poslurp" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 890d???????? ffc5 4983c444 413be8 0f826fffffff 488bcb ff15???????? } // n = 7, score = 100 // 890d???????? | // ffc5 | lea eax, [0xfffff90b] // 4983c444 | dec eax // 413be8 | mov dword ptr [esp + 0x40], ecx // 0f826fffffff | test eax, eax // 488bcb | jne 0x317 // ff15???????? | $sequence_1 = { 488bce 488bf8 488be8 33c0 f3aa 84db 7410 } // n = 7, score = 100 // 488bce | dec eax // 488bf8 | mov ecx, eax // 488be8 | dec eax // 33c0 | lea edx, [esp + 0x40] // f3aa | dec eax // 84db | mov ecx, ebx // 7410 | mov dword ptr [esp + 0x40], 0x238 $sequence_2 = { f7e2 c1ea05 3b15???????? 728c } // n = 4, score = 100 // f7e2 | dec ebp // c1ea05 | cmp esp, esi // 3b15???????? | // 728c | dec esp $sequence_3 = { ff15???????? 4c8be8 4885c0 0f84c2000000 4863453c } // n = 5, score = 100 // ff15???????? | // 4c8be8 | dec eax // 4885c0 | lea edx, [0xfffff5d8] // 0f84c2000000 | inc ebp // 4863453c | xor ecx, ecx $sequence_4 = { 75cc 4d8be7 4d3bfe 0f8322020000 } // n = 4, score = 100 // 75cc | lea ecx, [ebp + 1] // 4d8be7 | dec eax // 4d3bfe | lea edx, [esp + 0x20] // 0f8322020000 | mov byte ptr [esp + 0x30], 0 $sequence_5 = { 492bca 7421 498bd1 0fb702 6683f830 } // n = 5, score = 100 // 492bca | xor eax, eax // 7421 | rep stosb byte ptr es:[edi], al // 498bd1 | test bl, bl // 0fb702 | je 0x7cb // 6683f830 | inc ebp $sequence_6 = { c744242004000000 ff15???????? 488bd8 4883f8ff 743d 448d4f02 } // n = 6, score = 100 // c744242004000000 | dec eax // ff15???????? | // 488bd8 | mov edi, dword ptr [esp + 0x2b0] // 4883f8ff | dec eax // 743d | mov esi, dword ptr [esp + 0x2a8] // 448d4f02 | cmp ecx, edx $sequence_7 = { c640eb04 458d5807 c640ec05 c640ed07 c640ee08 c640ef0a c640f00b } // n = 7, score = 100 // c640eb04 | dec eax // 458d5807 | mov ecx, ebx // c640ec05 | dec esp // c640ed07 | mov esp, eax // c640ee08 | lea eax, [edi - 0xf] // c640ef0a | cmp eax, 5 // c640f00b | ja 0xb2f $sequence_8 = { 418bc8 ffce 488bd5 2bcd 8bfb } // n = 5, score = 100 // 418bc8 | ja 0x865 // ffce | inc ecx // 488bd5 | dec ecx // 2bcd | inc esp // 8bfb | cmp eax, 9 $sequence_9 = { ffce 488bd5 48d1f9 8bfb 85c9 } // n = 5, score = 100 // ffce | dec eax // 488bd5 | mov ecx, ebx // 48d1f9 | jmp 0x65a // 8bfb | mov ecx, 1 // 85c9 | dec eax condition: 7 of them and filesize < 50176 }
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