Actor(s): APT 30
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rule win_rhttpctrl_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.rhttpctrl." 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.rhttpctrl" 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 = { eb0f 8d0436 50 52 8b51f8 03d2 } // n = 6, score = 100 // eb0f | jmp 0x11 // 8d0436 | lea eax, [esi + esi] // 50 | push eax // 52 | push edx // 8b51f8 | mov edx, dword ptr [ecx - 8] // 03d2 | add edx, edx $sequence_1 = { ff520c 83c010 8985e8feffff c645fc01 85f6 743b f7c60000ffff } // n = 7, score = 100 // ff520c | call dword ptr [edx + 0xc] // 83c010 | add eax, 0x10 // 8985e8feffff | mov dword ptr [ebp - 0x118], eax // c645fc01 | mov byte ptr [ebp - 4], 1 // 85f6 | test esi, esi // 743b | je 0x3d // f7c60000ffff | test esi, 0xffff0000 $sequence_2 = { 7434 ba1c010000 8d8dd8feffff 0f1f8000000000 c60100 8d4901 83ea01 } // n = 7, score = 100 // 7434 | je 0x36 // ba1c010000 | mov edx, 0x11c // 8d8dd8feffff | lea ecx, [ebp - 0x128] // 0f1f8000000000 | nop dword ptr [eax] // c60100 | mov byte ptr [ecx], 0 // 8d4901 | lea ecx, [ecx + 1] // 83ea01 | sub edx, 1 $sequence_3 = { ff15???????? ff742438 8b35???????? ffd6 ff74243c } // n = 5, score = 100 // ff15???????? | // ff742438 | push dword ptr [esp + 0x38] // 8b35???????? | // ffd6 | call esi // ff74243c | push dword ptr [esp + 0x3c] $sequence_4 = { c705????????b0324200 c705????????d8354200 c705????????d0344200 e8???????? 68???????? 50 6a01 } // n = 7, score = 100 // c705????????b0324200 | // c705????????d8354200 | // c705????????d0344200 | // e8???????? | // 68???????? | // 50 | push eax // 6a01 | push 1 $sequence_5 = { 8bec 83e4f0 81ec88010000 a1???????? 33c4 89842484010000 8b4508 } // n = 7, score = 100 // 8bec | mov ebp, esp // 83e4f0 | and esp, 0xfffffff0 // 81ec88010000 | sub esp, 0x188 // a1???????? | // 33c4 | xor eax, esp // 89842484010000 | mov dword ptr [esp + 0x184], eax // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_6 = { 33d2 8b08 85c9 7407 } // n = 4, score = 100 // 33d2 | xor edx, edx // 8b08 | mov ecx, dword ptr [eax] // 85c9 | test ecx, ecx // 7407 | je 9 $sequence_7 = { 0f448c24ac000000 894c241c e8???????? 83c40c 89442428 } // n = 5, score = 100 // 0f448c24ac000000 | cmove ecx, dword ptr [esp + 0xac] // 894c241c | mov dword ptr [esp + 0x1c], ecx // e8???????? | // 83c40c | add esp, 0xc // 89442428 | mov dword ptr [esp + 0x28], eax $sequence_8 = { 85c0 7409 837e1c00 7403 c60000 } // n = 5, score = 100 // 85c0 | test eax, eax // 7409 | je 0xb // 837e1c00 | cmp dword ptr [esi + 0x1c], 0 // 7403 | je 5 // c60000 | mov byte ptr [eax], 0 $sequence_9 = { 0f1000 8b4508 0f1100 8be5 5d } // n = 5, score = 100 // 0f1000 | movups xmm0, xmmword ptr [eax] // 8b4508 | mov eax, dword ptr [ebp + 8] // 0f1100 | movups xmmword ptr [eax], xmm0 // 8be5 | mov esp, ebp // 5d | pop ebp condition: 7 of them and filesize < 339968 }
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