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 = "2023-01-25" 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 = "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 = { 8d9334010000 8bf0 8bff 8a08 40 } // n = 5, score = 100 // 8d9334010000 | lea edx, [ebx + 0x134] // 8bf0 | mov esi, eax // 8bff | mov edi, edi // 8a08 | mov cl, byte ptr [eax] // 40 | inc eax $sequence_1 = { 51 8d5705 52 83c020 50 e8???????? } // n = 6, score = 100 // 51 | push ecx // 8d5705 | lea edx, [edi + 5] // 52 | push edx // 83c020 | add eax, 0x20 // 50 | push eax // e8???????? | $sequence_2 = { eb02 33f6 c745fcffffffff 8b1d???????? 897704 833e00 0f8594000000 } // n = 7, score = 100 // eb02 | jmp 4 // 33f6 | xor esi, esi // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // 8b1d???????? | // 897704 | mov dword ptr [edi + 4], esi // 833e00 | cmp dword ptr [esi], 0 // 0f8594000000 | jne 0x9a $sequence_3 = { 83c404 8bf8 6800040000 897dfc } // n = 4, score = 100 // 83c404 | add esp, 4 // 8bf8 | mov edi, eax // 6800040000 | push 0x400 // 897dfc | mov dword ptr [ebp - 4], edi $sequence_4 = { 8be5 5d c3 85c0 0f8516040000 8b45f4 50 } // n = 7, score = 100 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 85c0 | test eax, eax // 0f8516040000 | jne 0x41c // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 50 | push eax $sequence_5 = { 8b0e 83c404 69c0e8030000 89814c000400 } // n = 4, score = 100 // 8b0e | mov ecx, dword ptr [esi] // 83c404 | add esp, 4 // 69c0e8030000 | imul eax, eax, 0x3e8 // 89814c000400 | mov dword ptr [ecx + 0x4004c], eax $sequence_6 = { 50 8bd9 8bf2 89bdb8feffff } // n = 4, score = 100 // 50 | push eax // 8bd9 | mov ebx, ecx // 8bf2 | mov esi, edx // 89bdb8feffff | mov dword ptr [ebp - 0x148], edi $sequence_7 = { 2bc6 40 50 51 52 } // n = 5, score = 100 // 2bc6 | sub eax, esi // 40 | inc eax // 50 | push eax // 51 | push ecx // 52 | push edx $sequence_8 = { 88543bff 83ff20 7ce6 8b55e0 8b45fc 83c2e0 } // n = 6, score = 100 // 88543bff | mov byte ptr [ebx + edi - 1], dl // 83ff20 | cmp edi, 0x20 // 7ce6 | jl 0xffffffe8 // 8b55e0 | mov edx, dword ptr [ebp - 0x20] // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c2e0 | add edx, -0x20 $sequence_9 = { 8a8149000400 8b9754060000 888211010000 8b8754060000 83c40c 8bf7 } // n = 6, score = 100 // 8a8149000400 | mov al, byte ptr [ecx + 0x40049] // 8b9754060000 | mov edx, dword ptr [edi + 0x654] // 888211010000 | mov byte ptr [edx + 0x111], al // 8b8754060000 | mov eax, dword ptr [edi + 0x654] // 83c40c | add esp, 0xc // 8bf7 | mov esi, edi 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 }
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