Actor(s): Dropping Elephant
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rule win_badnews_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badnews" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" malpedia_license = "CC BY-NC-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 / approach 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???????? 50 e8???????? 83c404 68???????? 6804010000 } // n = 6, score = 900 // ff15???????? | // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 68???????? | // 6804010000 | push 0x104 $sequence_1 = { c0e004 02c1 3423 c0c003 } // n = 4, score = 900 // c0e004 | shl al, 4 // 02c1 | add al, cl // 3423 | xor al, 0x23 // c0c003 | rol al, 3 $sequence_2 = { eb02 33c9 c0e004 02c1 } // n = 4, score = 900 // eb02 | jmp 4 // 33c9 | xor ecx, ecx // c0e004 | shl al, 4 // 02c1 | add al, cl $sequence_3 = { 68???????? 6a02 68???????? 50 a3???????? } // n = 5, score = 800 // 68???????? | // 6a02 | push 2 // 68???????? | // 50 | push eax // a3???????? | $sequence_4 = { c78534ffffff47657457 c78538ffffff696e646f c7853cffffff77546578 66c78540ffffff7457 } // n = 4, score = 800 // c78534ffffff47657457 | mov dword ptr [ebp - 0xcc], 0x57746547 // c78538ffffff696e646f | mov dword ptr [ebp - 0xc8], 0x6f646e69 // c7853cffffff77546578 | mov dword ptr [ebp - 0xc4], 0x78655477 // 66c78540ffffff7457 | mov word ptr [ebp - 0xc0], 0x5774 $sequence_5 = { 33c5 8945fc 53 56 57 8d8534ffffff } // n = 6, score = 800 // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 56 | push esi // 57 | push edi // 8d8534ffffff | lea eax, [ebp - 0xcc] $sequence_6 = { c705????????55736572 c705????????33322e64 66c705????????6c6c c605????????00 } // n = 4, score = 800 // c705????????55736572 | // c705????????33322e64 | // 66c705????????6c6c | // c605????????00 | $sequence_7 = { c745806e000000 ff15???????? 57 ff15???????? } // n = 4, score = 800 // c745806e000000 | mov dword ptr [ebp - 0x80], 0x6e // ff15???????? | // 57 | push edi // ff15???????? | $sequence_8 = { 8bf0 56 ff15???????? 50 6a40 } // n = 5, score = 700 // 8bf0 | mov esi, eax // 56 | push esi // ff15???????? | // 50 | push eax // 6a40 | push 0x40 $sequence_9 = { 56 ffd3 85c0 7403 83c608 } // n = 5, score = 700 // 56 | push esi // ffd3 | call ebx // 85c0 | test eax, eax // 7403 | je 5 // 83c608 | add esi, 8 $sequence_10 = { 57 6a00 6880000000 6a04 6a00 6a01 6a04 } // n = 7, score = 700 // 57 | push edi // 6a00 | push 0 // 6880000000 | push 0x80 // 6a04 | push 4 // 6a00 | push 0 // 6a01 | push 1 // 6a04 | push 4 $sequence_11 = { d1f9 68???????? 03c9 51 } // n = 4, score = 700 // d1f9 | sar ecx, 1 // 68???????? | // 03c9 | add ecx, ecx // 51 | push ecx $sequence_12 = { ff15???????? 85c0 7405 83c004 eb02 } // n = 5, score = 700 // ff15???????? | // 85c0 | test eax, eax // 7405 | je 7 // 83c004 | add eax, 4 // eb02 | jmp 4 $sequence_13 = { 8bca 83e103 68???????? f3a4 50 } // n = 5, score = 500 // 8bca | mov ecx, edx // 83e103 | and ecx, 3 // 68???????? | // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 50 | push eax $sequence_14 = { 8a06 8d7601 84c0 75f7 } // n = 4, score = 100 // 8a06 | mov al, byte ptr [esi] // 8d7601 | lea esi, [esi + 1] // 84c0 | test al, al // 75f7 | jne 0xfffffff9 $sequence_15 = { 8b0485d0a70110 f644010480 0f8432030000 e8???????? 33c9 } // n = 5, score = 100 // 8b0485d0a70110 | mov eax, dword ptr [eax*4 + 0x1001a7d0] // f644010480 | test byte ptr [ecx + eax + 4], 0x80 // 0f8432030000 | je 0x338 // e8???????? | // 33c9 | xor ecx, ecx $sequence_16 = { 58 6bc000 c780bca4011002000000 6a04 58 } // n = 5, score = 100 // 58 | pop eax // 6bc000 | imul eax, eax, 0 // c780bca4011002000000 | mov dword ptr [eax + 0x1001a4bc], 2 // 6a04 | push 4 // 58 | pop eax $sequence_17 = { 50 6a02 8d45f8 50 8b0495d0a70110 ff3418 } // n = 6, score = 100 // 50 | push eax // 6a02 | push 2 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 8b0495d0a70110 | mov eax, dword ptr [edx*4 + 0x1001a7d0] // ff3418 | push dword ptr [eax + ebx] $sequence_18 = { eb0a c7854cfbffff01000000 43 899d50fbffff 83fb04 } // n = 5, score = 100 // eb0a | jmp 0xc // c7854cfbffff01000000 | mov dword ptr [ebp - 0x4b4], 1 // 43 | inc ebx // 899d50fbffff | mov dword ptr [ebp - 0x4b0], ebx // 83fb04 | cmp ebx, 4 $sequence_19 = { 897e70 6a43 58 668986b8000000 668986be010000 c7466848960110 83a6b803000000 } // n = 7, score = 100 // 897e70 | mov dword ptr [esi + 0x70], edi // 6a43 | push 0x43 // 58 | pop eax // 668986b8000000 | mov word ptr [esi + 0xb8], ax // 668986be010000 | mov word ptr [esi + 0x1be], ax // c7466848960110 | mov dword ptr [esi + 0x68], 0x10019648 // 83a6b803000000 | and dword ptr [esi + 0x3b8], 0 $sequence_20 = { 830fff 8bf7 2b349dd0a70110 c1fe06 8bc3 } // n = 5, score = 100 // 830fff | or dword ptr [edi], 0xffffffff // 8bf7 | mov esi, edi // 2b349dd0a70110 | sub esi, dword ptr [ebx*4 + 0x1001a7d0] // c1fe06 | sar esi, 6 // 8bc3 | mov eax, ebx condition: 7 of them and filesize < 466944 }
import "pe" rule win_badnews_w0 { meta: author = "Florian Roth" reference = "http://blog.fortinet.com/2017/04/05/in-depth-look-at-new-variant-of-monsoon-apt-backdoor-part-2" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badnews" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "\\Microsoft\\Windows\\coco.exe" fullword ascii $x2 = ":\\System Volume Information\\config" fullword ascii $x3 = " cscript.[BACKSPA[PAGE DO[CAPS LO[PAGE UPTPX498.dTPX499.d" fullword wide $s1 = "\\Microsoft\\Templates\\msvcrt.dll" fullword ascii $s2 = "%04d/%02d/%02d %02d:%02d:%02d - {%s}" fullword wide $s3 = "wininet.dll " fullword ascii $s4 = "DMCZ0001.dat" fullword ascii $s5 = "TZ0000001.dat" fullword ascii $s6 = "\\MUT.dat" fullword ascii $s7 = "ouemm/emm!!!!!!!!!!!!!" fullword ascii condition: ( 1 of ($x*) or 3 of them ) }
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