Actor(s): Pirate Panda
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rule win_usbferry_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.usbferry." 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.usbferry" 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 = { 56 57 33ff 57 6880000010 6a03 } // n = 6, score = 200 // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 57 | push edi // 6880000010 | push 0x10000080 // 6a03 | push 3 $sequence_1 = { 8b85a4f7ffff 50 ff15???????? b801000000 8b4dfc 33cd } // n = 6, score = 200 // 8b85a4f7ffff | mov eax, dword ptr [ebp - 0x85c] // 50 | push eax // ff15???????? | // b801000000 | mov eax, 1 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp $sequence_2 = { 8a4801 888da2f5ffff 838594f5ffff01 80bda2f5ffff00 75e1 } // n = 5, score = 200 // 8a4801 | mov cl, byte ptr [eax + 1] // 888da2f5ffff | mov byte ptr [ebp - 0xa5e], cl // 838594f5ffff01 | add dword ptr [ebp - 0xa6c], 1 // 80bda2f5ffff00 | cmp byte ptr [ebp - 0xa5e], 0 // 75e1 | jne 0xffffffe3 $sequence_3 = { 8816 83c603 e9???????? 83c8ff eb05 } // n = 5, score = 200 // 8816 | mov byte ptr [esi], dl // 83c603 | add esi, 3 // e9???????? | // 83c8ff | or eax, 0xffffffff // eb05 | jmp 7 $sequence_4 = { 6a00 6800000008 6a00 6a00 6a00 8d95f4f7ffff } // n = 6, score = 200 // 6a00 | push 0 // 6800000008 | push 0x8000000 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 8d95f4f7ffff | lea edx, [ebp - 0x80c] $sequence_5 = { e8???????? 83c40c 8d85c4e9ffff 50 a1???????? } // n = 5, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 8d85c4e9ffff | lea eax, [ebp - 0x163c] // 50 | push eax // a1???????? | $sequence_6 = { a1???????? 51 ff90a8000000 85c0 750c } // n = 5, score = 200 // a1???????? | // 51 | push ecx // ff90a8000000 | call dword ptr [eax + 0xa8] // 85c0 | test eax, eax // 750c | jne 0xe $sequence_7 = { e8???????? 59 85c0 752e 6a09 59 } // n = 6, score = 200 // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 752e | jne 0x30 // 6a09 | push 9 // 59 | pop ecx $sequence_8 = { f3a4 6a01 8d85a8faffff 50 e8???????? } // n = 5, score = 200 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 6a01 | push 1 // 8d85a8faffff | lea eax, [ebp - 0x558] // 50 | push eax // e8???????? | $sequence_9 = { 8b4d14 51 6a00 8b5510 52 8b45e0 50 } // n = 7, score = 200 // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 51 | push ecx // 6a00 | push 0 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 52 | push edx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 50 | push eax $sequence_10 = { 0f28c3 f20f11458c 53 56 8bf1 57 } // n = 6, score = 200 // 0f28c3 | movaps xmm0, xmm3 // f20f11458c | movsd qword ptr [ebp - 0x74], xmm0 // 53 | push ebx // 56 | push esi // 8bf1 | mov esi, ecx // 57 | push edi $sequence_11 = { 84db 0f94c0 83c00b eb43 } // n = 4, score = 200 // 84db | test bl, bl // 0f94c0 | sete al // 83c00b | add eax, 0xb // eb43 | jmp 0x45 $sequence_12 = { c645b96f c645ba73 c645bb6f c645bc66 c645bd74 c645be5c c645bf57 } // n = 7, score = 200 // c645b96f | mov byte ptr [ebp - 0x47], 0x6f // c645ba73 | mov byte ptr [ebp - 0x46], 0x73 // c645bb6f | mov byte ptr [ebp - 0x45], 0x6f // c645bc66 | mov byte ptr [ebp - 0x44], 0x66 // c645bd74 | mov byte ptr [ebp - 0x43], 0x74 // c645be5c | mov byte ptr [ebp - 0x42], 0x5c // c645bf57 | mov byte ptr [ebp - 0x41], 0x57 $sequence_13 = { c785dcf7ffff01000000 33d2 8995a0f7ffff 8995a4f7ffff 8995a8f7ffff 8995acf7ffff } // n = 6, score = 200 // c785dcf7ffff01000000 | mov dword ptr [ebp - 0x824], 1 // 33d2 | xor edx, edx // 8995a0f7ffff | mov dword ptr [ebp - 0x860], edx // 8995a4f7ffff | mov dword ptr [ebp - 0x85c], edx // 8995a8f7ffff | mov dword ptr [ebp - 0x858], edx // 8995acf7ffff | mov dword ptr [ebp - 0x854], edx $sequence_14 = { 42 46 83ef01 75f1 5f } // n = 5, score = 200 // 42 | inc edx // 46 | inc esi // 83ef01 | sub edi, 1 // 75f1 | jne 0xfffffff3 // 5f | pop edi $sequence_15 = { ff15???????? c745c000000000 6afe 8d55f0 52 } // n = 5, score = 200 // ff15???????? | // c745c000000000 | mov dword ptr [ebp - 0x40], 0 // 6afe | push -2 // 8d55f0 | lea edx, [ebp - 0x10] // 52 | push edx condition: 7 of them and filesize < 638976 }
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