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rule win_smanager_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.smanager." 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.smanager" 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 = { c7462cffffffff 7410 6a00 6a00 } // n = 4, score = 600 // c7462cffffffff | mov dword ptr [esi + 0x28], edi // 7410 | push ecx // 6a00 | call eax // 6a00 | add esp, 0xc $sequence_1 = { 8b4510 85c0 7407 50 ff15???????? 5f } // n = 6, score = 600 // 8b4510 | lea eax, [0x1ec] // 85c0 | dec eax // 7407 | mov dword ptr [ebp - 9], eax // 50 | dec eax // ff15???????? | // 5f | mov dword ptr [ebp - 1], ebx $sequence_2 = { 51 51 ffd0 83c40c c7460800000000 } // n = 5, score = 600 // 51 | movaps xmm0, xmmword ptr [ebp - 9] // 51 | dec eax // ffd0 | lea ecx, [ebx + 0x10] // 83c40c | inc ebp // c7460800000000 | xor ecx, ecx $sequence_3 = { 85f6 7417 8b0e 85c9 } // n = 4, score = 600 // 85f6 | push esi // 7417 | push 0 // 8b0e | push 0 // 85c9 | mov edi, eax $sequence_4 = { 8b7604 6a00 6a00 56 68???????? } // n = 5, score = 600 // 8b7604 | xor edx, edx // 6a00 | dec eax // 6a00 | sub esp, 0x20 // 56 | dec eax // 68???????? | $sequence_5 = { 83c602 6a22 56 e8???????? 83c408 85c0 } // n = 6, score = 600 // 83c602 | inc ebp // 6a22 | xor eax, eax // 56 | mov edx, dword ptr [edi + 4] // e8???????? | // 83c408 | call dword ptr [eax + 8] // 85c0 | mov esi, dword ptr [esi + 4] $sequence_6 = { 8b4608 85c0 7420 a801 7515 83e0fe } // n = 6, score = 600 // 8b4608 | push esi // 85c0 | add esp, 8 // 7420 | test eax, eax // a801 | push 2 // 7515 | push ecx // 83e0fe | push ecx $sequence_7 = { 6a00 6a00 ff15???????? 8bf8 897e28 } // n = 5, score = 600 // 6a00 | mov ebx, ecx // 6a00 | dec eax // ff15???????? | // 8bf8 | lea eax, [0x9dfb] // 897e28 | dec eax $sequence_8 = { ff15???????? 32c0 e9???????? 0f1005???????? } // n = 4, score = 300 // ff15???????? | // 32c0 | xor al, al // e9???????? | // 0f1005???????? | $sequence_9 = { a801 751c 4883e0fe 488d4f08 4c8b08 4d85c9 740c } // n = 7, score = 100 // a801 | test al, 1 // 751c | jne 0x1e // 4883e0fe | dec eax // 488d4f08 | and eax, 0xfffffffe // 4c8b08 | dec eax // 4d85c9 | lea ecx, [edi + 8] // 740c | dec esp $sequence_10 = { 0000 80ed4a 0044feff ff900100008c } // n = 4, score = 100 // 0000 | test al, 1 // 80ed4a | je 0xb // 0044feff | push 2 // ff900100008c | push ecx $sequence_11 = { 4883ec20 488bd9 e8???????? 488d05fb9d0000 } // n = 4, score = 100 // 4883ec20 | inc ebp // 488bd9 | xor eax, eax // e8???????? | // 488d05fb9d0000 | dec eax $sequence_12 = { 0000 8b9534fdffff 83c201 899534fdffff } // n = 4, score = 100 // 0000 | add byte ptr [eax], al // 8b9534fdffff | sub ch, 0x4a // 83c201 | add byte ptr [esi + edi*8 - 1], al // 899534fdffff | call dword ptr [eax - 0x73ffffff] $sequence_13 = { 0001 ce 50 0008 } // n = 4, score = 100 // 0001 | add byte ptr [edi + 0x73], dh // ce | add byte ptr [eax], al // 50 | mov edx, dword ptr [ebp - 0x2cc] // 0008 | add edx, 1 $sequence_14 = { 488d0d95fcffff ff15???????? b902800000 ff15???????? 90 } // n = 5, score = 100 // 488d0d95fcffff | je 0xcd // ff15???????? | // b902800000 | mov word ptr [eax], bp // ff15???????? | // 90 | sub eax, ebx $sequence_15 = { b920000000 e8???????? 488bf8 448b842480000000 33d2 } // n = 5, score = 100 // b920000000 | lea ecx, [0xfffffc95] // e8???????? | // 488bf8 | mov ecx, 0x8002 // 448b842480000000 | nop // 33d2 | je 0x1e $sequence_16 = { 0006 fc 59 008dfd590000 } // n = 4, score = 100 // 0006 | add byte ptr [esi + edi*8], al // fc | pop ecx // 59 | add byte ptr [esi + edi*8 + 0x59], al // 008dfd590000 | add byte ptr [ecx + 0x59fe], cl $sequence_17 = { 488d05ec010000 488945f7 48895dff 0f2845f7 } // n = 4, score = 100 // 488d05ec010000 | mov ecx, ebp // 488945f7 | inc ecx // 48895dff | lea edx, [eax + 1] // 0f2845f7 | call eax $sequence_18 = { 4885c0 0f84c7000000 668928 2bc3 448bc0 4981f8feffff7f } // n = 6, score = 100 // 4885c0 | mov ecx, dword ptr [eax] // 0f84c7000000 | dec ebp // 668928 | test ecx, ecx // 2bc3 | je 0xe // 448bc0 | dec eax // 4981f8feffff7f | test eax, eax $sequence_19 = { 741c 4533c0 488bcd 418d5001 ffd0 } // n = 5, score = 100 // 741c | inc esp // 4533c0 | mov eax, eax // 488bcd | dec ecx // 418d5001 | cmp eax, 0x7ffffffe // ffd0 | dec eax $sequence_20 = { 0000 0c0c 0c0c 0c0c 0c0c 0c0c 0102 } // n = 7, score = 100 // 0000 | mov esi, dword ptr [esi + 4] // 0c0c | push 0 // 0c0c | push 0 // 0c0c | push esi // 0c0c | mov eax, dword ptr [esi + 8] // 0c0c | test eax, eax // 0102 | je 0x24 $sequence_21 = { 0003 b157 0000 0c0c } // n = 4, score = 100 // 0003 | add byte ptr [ecx], al // b157 | into // 0000 | push eax // 0c0c | add byte ptr [eax], cl $sequence_22 = { 0007 b15a 0007 b15a } // n = 4, score = 100 // 0007 | add byte ptr [esi], al // b15a | cld // 0007 | pop ecx // b15a | add byte ptr [ebp + 0x59fd], cl $sequence_23 = { 0004fe 59 0044fe59 0089fe590000 } // n = 4, score = 100 // 0004fe | add byte ptr [ebx], al // 59 | mov cl, 0x57 // 0044fe59 | add byte ptr [eax], al // 0089fe590000 | or al, 0xc condition: 7 of them and filesize < 10013696 }
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