Actor(s): Dropping Elephant
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rule win_badnews_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.badnews." 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.badnews" malpedia_rule_date = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 68???????? 6a1a 68???????? 57 } // n = 4, score = 700 // 68???????? | // 6a1a | push 0x1a // 68???????? | // 57 | push edi $sequence_1 = { 50 e8???????? 83c404 68???????? 6804010000 ff15???????? } // n = 6, score = 700 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 68???????? | // 6804010000 | push 0x104 // ff15???????? | $sequence_2 = { eb02 33c9 c0e004 02c1 3423 } // n = 5, score = 700 // eb02 | jmp 4 // 33c9 | xor ecx, ecx // c0e004 | shl al, 4 // 02c1 | add al, cl // 3423 | xor al, 0x23 $sequence_3 = { a1???????? 33c5 8945fc 53 56 57 8d8534ffffff } // n = 7, score = 600 // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 56 | push esi // 57 | push edi // 8d8534ffffff | lea eax, dword ptr [ebp - 0xcc] $sequence_4 = { c745806e000000 ff15???????? 57 ff15???????? } // n = 4, score = 600 // c745806e000000 | mov dword ptr [ebp - 0x80], 0x6e // ff15???????? | // 57 | push edi // ff15???????? | $sequence_5 = { c705????????33322e64 66c705????????6c6c c605????????00 ff15???????? } // n = 4, score = 600 // c705????????33322e64 | // 66c705????????6c6c | // c605????????00 | // ff15???????? | $sequence_6 = { 55 8bec 8b450c 3d01020000 } // n = 4, score = 600 // 55 | push ebp // 8bec | mov ebp, esp // 8b450c | mov eax, dword ptr [ebp + 0xc] // 3d01020000 | cmp eax, 0x201 $sequence_7 = { 6a01 6a00 6a03 6a00 6a00 6a50 53 } // n = 7, score = 600 // 6a01 | push 1 // 6a00 | push 0 // 6a03 | push 3 // 6a00 | push 0 // 6a00 | push 0 // 6a50 | push 0x50 // 53 | push ebx $sequence_8 = { 6a00 d1f9 68???????? 03c9 51 } // n = 5, score = 500 // 6a00 | push 0 // d1f9 | sar ecx, 1 // 68???????? | // 03c9 | add ecx, ecx // 51 | push ecx $sequence_9 = { 57 6a00 6880000000 6a04 6a00 6a01 6a04 } // n = 7, score = 500 // 57 | push edi // 6a00 | push 0 // 6880000000 | push 0x80 // 6a04 | push 4 // 6a00 | push 0 // 6a01 | push 1 // 6a04 | push 4 $sequence_10 = { 56 ffd3 85c0 7403 83c608 8a06 } // n = 6, score = 500 // 56 | push esi // ffd3 | call ebx // 85c0 | test eax, eax // 7403 | je 5 // 83c608 | add esi, 8 // 8a06 | mov al, byte ptr [esi] $sequence_11 = { 8bf0 56 ff15???????? 50 6a40 ff15???????? } // n = 6, score = 500 // 8bf0 | mov esi, eax // 56 | push esi // ff15???????? | // 50 | push eax // 6a40 | push 0x40 // ff15???????? | $sequence_12 = { ff15???????? 85c0 7405 83c004 } // n = 4, score = 500 // ff15???????? | // 85c0 | test eax, eax // 7405 | je 7 // 83c004 | add eax, 4 $sequence_13 = { c1f805 c1e606 8b0485d0a70110 80643004fd 8b45f8 8b55fc } // n = 6, score = 100 // c1f805 | sar eax, 5 // c1e606 | shl esi, 6 // 8b0485d0a70110 | mov eax, dword ptr [eax*4 + 0x1001a7d0] // 80643004fd | and byte ptr [eax + esi + 4], 0xfd // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_14 = { 57 e8???????? 83c404 85db 7428 } // n = 5, score = 100 // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 85db | test ebx, ebx // 7428 | je 0x2a $sequence_15 = { c645f40d 50 8b8528e5ffff 8b0485d0a70110 ff3401 } // n = 5, score = 100 // c645f40d | mov byte ptr [ebp - 0xc], 0xd // 50 | push eax // 8b8528e5ffff | mov eax, dword ptr [ebp - 0x1ad8] // 8b0485d0a70110 | mov eax, dword ptr [eax*4 + 0x1001a7d0] // ff3401 | push dword ptr [ecx + eax] $sequence_16 = { e8???????? 68???????? 8d45f0 c745f0402f0110 50 e8???????? cc } // n = 7, score = 100 // e8???????? | // 68???????? | // 8d45f0 | lea eax, dword ptr [ebp - 0x10] // c745f0402f0110 | mov dword ptr [ebp - 0x10], 0x10012f40 // 50 | push eax // e8???????? | // cc | int3 $sequence_17 = { 33c0 3b0cc530610110 740a 40 83f817 } // n = 5, score = 100 // 33c0 | xor eax, eax // 3b0cc530610110 | cmp ecx, dword ptr [eax*8 + 0x10016130] // 740a | je 0xc // 40 | inc eax // 83f817 | cmp eax, 0x17 $sequence_18 = { 57 33ff 8bcf 8bc7 894de4 399870980110 0f84e8000000 } // n = 7, score = 100 // 57 | push edi // 33ff | xor edi, edi // 8bcf | mov ecx, edi // 8bc7 | mov eax, edi // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 399870980110 | cmp dword ptr [eax + 0x10019870], ebx // 0f84e8000000 | je 0xee $sequence_19 = { 8bca c1f905 83e21f c1e206 8b0c8dd0a70110 89040a } // n = 6, score = 100 // 8bca | mov ecx, edx // c1f905 | sar ecx, 5 // 83e21f | and edx, 0x1f // c1e206 | shl edx, 6 // 8b0c8dd0a70110 | mov ecx, dword ptr [ecx*4 + 0x1001a7d0] // 89040a | mov dword ptr [edx + ecx], eax $sequence_20 = { 6a00 f3a4 50 ff15???????? 8b4dfc } // n = 5, score = 100 // 6a00 | push 0 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 50 | push eax // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] 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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