Actor(s): Mirage
There is no description at this point.
rule win_bs2005_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.bs2005." 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.bs2005" 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 = { ff15???????? 85c0 8b8564ffffff 7836 85c0 } // n = 5, score = 100 // ff15???????? | // 85c0 | test eax, eax // 8b8564ffffff | mov eax, dword ptr [ebp - 0x9c] // 7836 | js 0x38 // 85c0 | test eax, eax $sequence_1 = { 52 50 8b4124 ffd0 85c0 7848 8b45e4 } // n = 7, score = 100 // 52 | push edx // 50 | push eax // 8b4124 | mov eax, dword ptr [ecx + 0x24] // ffd0 | call eax // 85c0 | test eax, eax // 7848 | js 0x4a // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] $sequence_2 = { e8???????? 84c0 0f8473ffffff 8d9644050000 b904010000 8bc2 c60000 } // n = 7, score = 100 // e8???????? | // 84c0 | test al, al // 0f8473ffffff | je 0xffffff79 // 8d9644050000 | lea edx, [esi + 0x544] // b904010000 | mov ecx, 0x104 // 8bc2 | mov eax, edx // c60000 | mov byte ptr [eax], 0 $sequence_3 = { 8945f4 894dfc 8955f0 8b45f8 } // n = 4, score = 100 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 894dfc | mov dword ptr [ebp - 4], ecx // 8955f0 | mov dword ptr [ebp - 0x10], edx // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_4 = { 8bf8 6800040000 897dfc e8???????? 83c404 } // n = 5, score = 100 // 8bf8 | mov edi, eax // 6800040000 | push 0x400 // 897dfc | mov dword ptr [ebp - 4], edi // e8???????? | // 83c404 | add esp, 4 $sequence_5 = { ffd6 8b45e8 50 ffd7 8d4ddc } // n = 5, score = 100 // ffd6 | call esi // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 50 | push eax // ffd7 | call edi // 8d4ddc | lea ecx, [ebp - 0x24] $sequence_6 = { 50 8d45bc 50 8d4710 50 6a00 6a01 } // n = 7, score = 100 // 50 | push eax // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // 8d4710 | lea eax, [edi + 0x10] // 50 | push eax // 6a00 | push 0 // 6a01 | push 1 $sequence_7 = { be???????? 8d7db8 f3a5 8bc2 c1e802 83e03f } // n = 6, score = 100 // be???????? | // 8d7db8 | lea edi, [ebp - 0x48] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc2 | mov eax, edx // c1e802 | shr eax, 2 // 83e03f | and eax, 0x3f $sequence_8 = { b904010000 8d4310 c60000 40 49 75f9 b904010000 } // n = 7, score = 100 // b904010000 | mov ecx, 0x104 // 8d4310 | lea eax, [ebx + 0x10] // c60000 | mov byte ptr [eax], 0 // 40 | inc eax // 49 | dec ecx // 75f9 | jne 0xfffffffb // b904010000 | mov ecx, 0x104 $sequence_9 = { 8b85c4feffff 3bc3 7403 50 ffd6 8b85d0feffff 3bc3 } // n = 7, score = 100 // 8b85c4feffff | mov eax, dword ptr [ebp - 0x13c] // 3bc3 | cmp eax, ebx // 7403 | je 5 // 50 | push eax // ffd6 | call esi // 8b85d0feffff | mov eax, dword ptr [ebp - 0x130] // 3bc3 | cmp eax, ebx condition: 7 of them and filesize < 212992 }
import "pe" rule win_bs2005_w0 { meta: description = "Detects malware from APT 15 report by NCC Group" author = "Florian Roth" reference = "https://goo.gl/HZ5XMN" date = "2018-03-10" hash = "750d9eecd533f89b8aa13aeab173a1cf813b021b6824bc30e60f5db6fa7b950b" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bs2005" malpedia_version = "20180312" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "AAAAKQAASCMAABi+AABnhEBj8vep7VRoAEPRWLweGc0/eiDrXGajJXRxbXsTXAcZAABK4QAAPWwAACzWAAByrg==" fullword ascii $x2 = "AAAAKQAASCMAABi+AABnhKv3kXJJousn5YzkjGF46eE3G8ZGse4B9uoqJo8Q2oF0AABK4QAAPWwAACzWAAByrg==" fullword ascii $a1 = "http://%s/content.html?id=%s" fullword ascii $a2 = "http://%s/main.php?ssid=%s" fullword ascii $a3 = "http://%s/webmail.php?id=%s" fullword ascii $a9 = "http://%s/error.html?tab=%s" fullword ascii $s1 = "%s\\~tmp.txt" fullword ascii $s2 = "%s /C %s >>\"%s\" 2>&1" fullword ascii $s3 = "DisableFirstRunCustomize" fullword ascii condition: 1 of ($x*) or 2 of them }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY