Actor(s): Dropping Elephant
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rule win_badnews_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.badnews" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 83e957 eb02 33c9 c0e004 02c1 } // n = 5, score = 900 // 83e957 | sub ecx, 0x57 // eb02 | jmp 4 // 33c9 | xor ecx, ecx // c0e004 | shl al, 4 // 02c1 | add al, cl $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 = { ff15???????? 50 e8???????? 83c404 68???????? 6804010000 ff15???????? } // n = 7, score = 900 // ff15???????? | // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 68???????? | // 6804010000 | push 0x104 // ff15???????? | $sequence_3 = { c745806e000000 ff15???????? 57 ff15???????? } // n = 4, score = 800 // c745806e000000 | mov dword ptr [ebp - 0x80], 0x6e // ff15???????? | // 57 | push edi // ff15???????? | $sequence_4 = { c705????????55736572 c705????????33322e64 66c705????????6c6c c605????????00 ff15???????? } // n = 5, score = 800 // c705????????55736572 | // c705????????33322e64 | // 66c705????????6c6c | // c605????????00 | // ff15???????? | $sequence_5 = { 8945fc 53 56 57 8d8534ffffff } // n = 5, score = 800 // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 56 | push esi // 57 | push edi // 8d8534ffffff | lea eax, [ebp - 0xcc] $sequence_6 = { 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_7 = { 55 8bec 8b450c 3d01020000 } // n = 4, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 8b450c | mov eax, dword ptr [ebp + 0xc] // 3d01020000 | cmp eax, 0x201 $sequence_8 = { 8bf0 56 ff15???????? 50 6a40 ff15???????? } // n = 6, score = 700 // 8bf0 | mov esi, eax // 56 | push esi // ff15???????? | // 50 | push eax // 6a40 | push 0x40 // ff15???????? | $sequence_9 = { ffd3 85c0 7403 83c608 8a06 } // n = 5, score = 700 // ffd3 | call ebx // 85c0 | test eax, eax // 7403 | je 5 // 83c608 | add esi, 8 // 8a06 | mov al, byte ptr [esi] $sequence_10 = { 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_11 = { 6a00 d1f9 68???????? 03c9 } // n = 4, score = 700 // 6a00 | push 0 // d1f9 | sar ecx, 1 // 68???????? | // 03c9 | add ecx, ecx $sequence_12 = { 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_13 = { 47 84c0 75f8 8bca 8d8538fbffff c1e902 } // n = 6, score = 100 // 47 | inc edi // 84c0 | test al, al // 75f8 | jne 0xfffffffa // 8bca | mov ecx, edx // 8d8538fbffff | lea eax, [ebp - 0x4c8] // c1e902 | shr ecx, 2 $sequence_14 = { e8???????? 59 ff34f5009e0110 ff15???????? } // n = 4, score = 100 // e8???????? | // 59 | pop ecx // ff34f5009e0110 | push dword ptr [esi*8 + 0x10019e00] // ff15???????? | $sequence_15 = { 7474 68???????? e8???????? 8d9554ffffff 83c404 2bd0 8d4900 } // n = 7, score = 100 // 7474 | je 0x76 // 68???????? | // e8???????? | // 8d9554ffffff | lea edx, [ebp - 0xac] // 83c404 | add esp, 4 // 2bd0 | sub edx, eax // 8d4900 | lea ecx, [ecx] $sequence_16 = { 50 8d4dc4 e8???????? 68???????? 8d45c4 c745c488380110 50 } // n = 7, score = 100 // 50 | push eax // 8d4dc4 | lea ecx, [ebp - 0x3c] // e8???????? | // 68???????? | // 8d45c4 | lea eax, [ebp - 0x3c] // c745c488380110 | mov dword ptr [ebp - 0x3c], 0x10013888 // 50 | push eax $sequence_17 = { 50 ffd6 a802 751b 6a02 8d8554ffffff 50 } // n = 7, score = 100 // 50 | push eax // ffd6 | call esi // a802 | test al, 2 // 751b | jne 0x1d // 6a02 | push 2 // 8d8554ffffff | lea eax, [ebp - 0xac] // 50 | push eax $sequence_18 = { 83fb40 0f8d46010000 8b3c9dd0a70110 85ff 0f84be000000 897de0 8b049dd0a70110 } // n = 7, score = 100 // 83fb40 | cmp ebx, 0x40 // 0f8d46010000 | jge 0x14c // 8b3c9dd0a70110 | mov edi, dword ptr [ebx*4 + 0x1001a7d0] // 85ff | test edi, edi // 0f84be000000 | je 0xc4 // 897de0 | mov dword ptr [ebp - 0x20], edi // 8b049dd0a70110 | mov eax, dword ptr [ebx*4 + 0x1001a7d0] $sequence_19 = { 8d85f8feffff 6a00 50 e8???????? 83c430 8db528feffff } // n = 6, score = 100 // 8d85f8feffff | lea eax, [ebp - 0x108] // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c430 | add esp, 0x30 // 8db528feffff | lea esi, [ebp - 0x1d8] $sequence_20 = { c1e706 8b0485d0a70110 83c00c 03c7 50 ff15???????? 33c0 } // n = 7, score = 100 // c1e706 | shl edi, 6 // 8b0485d0a70110 | mov eax, dword ptr [eax*4 + 0x1001a7d0] // 83c00c | add eax, 0xc // 03c7 | add eax, edi // 50 | push eax // ff15???????? | // 33c0 | xor eax, eax 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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