Actor(s): TA410
Keylogger.
rule win_unidentified_096_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.unidentified_096." 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.unidentified_096" 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 = { 8b742458 8d442424 33ed 50 } // n = 4, score = 100 // 8b742458 | mov esi, dword ptr [esp + 0x58] // 8d442424 | lea eax, [esp + 0x24] // 33ed | xor ebp, ebp // 50 | push eax $sequence_1 = { c744245010304000 896c2454 ff15???????? 6685c0 } // n = 4, score = 100 // c744245010304000 | mov dword ptr [esp + 0x50], 0x403010 // 896c2454 | mov dword ptr [esp + 0x54], ebp // ff15???????? | // 6685c0 | test ax, ax $sequence_2 = { ffd6 6a10 0fbfd8 ffd6 6890000000 0fbff8 ffd6 } // n = 7, score = 100 // ffd6 | call esi // 6a10 | push 0x10 // 0fbfd8 | movsx ebx, ax // ffd6 | call esi // 6890000000 | push 0x90 // 0fbff8 | movsx edi, ax // ffd6 | call esi $sequence_3 = { 55 55 6800000080 55 } // n = 4, score = 100 // 55 | push ebp // 55 | push ebp // 6800000080 | push 0x80000000 // 55 | push ebp $sequence_4 = { 5f 83c1f8 5e 83f926 } // n = 4, score = 100 // 5f | pop edi // 83c1f8 | add ecx, -8 // 5e | pop esi // 83f926 | cmp ecx, 0x26 $sequence_5 = { c744243000114000 896c2434 896c2438 8974243c 896c2440 896c2444 c744244806000000 } // n = 7, score = 100 // c744243000114000 | mov dword ptr [esp + 0x30], 0x401100 // 896c2434 | mov dword ptr [esp + 0x34], ebp // 896c2438 | mov dword ptr [esp + 0x38], ebp // 8974243c | mov dword ptr [esp + 0x3c], esi // 896c2440 | mov dword ptr [esp + 0x40], ebp // 896c2444 | mov dword ptr [esp + 0x44], ebp // c744244806000000 | mov dword ptr [esp + 0x48], 6 $sequence_6 = { 7735 8bd1 81e2ffff0000 83c296 } // n = 4, score = 100 // 7735 | ja 0x37 // 8bd1 | mov edx, ecx // 81e2ffff0000 | and edx, 0xffff // 83c296 | add edx, -0x6a $sequence_7 = { 52 e8???????? 83c424 8b4c242a 6683f930 0f8283000000 } // n = 6, score = 100 // 52 | push edx // e8???????? | // 83c424 | add esp, 0x24 // 8b4c242a | mov ecx, dword ptr [esp + 0x2a] // 6683f930 | cmp cx, 0x30 // 0f8283000000 | jb 0x89 $sequence_8 = { 85c0 7508 5e 5d 83c44c c21000 } // n = 6, score = 100 // 85c0 | test eax, eax // 7508 | jne 0xa // 5e | pop esi // 5d | pop ebp // 83c44c | add esp, 0x4c // c21000 | ret 0x10 $sequence_9 = { 52 e8???????? 83c418 c3 51 68???????? } // n = 6, score = 100 // 52 | push edx // e8???????? | // 83c418 | add esp, 0x18 // c3 | ret // 51 | push ecx // 68???????? | condition: 7 of them and filesize < 25648 }
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