Actor(s): Dropping Elephant
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rule win_badnews_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 50 e8???????? 83c404 68???????? 6804010000 ff15???????? } // n = 6, score = 1000 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 68???????? | // 6804010000 | push 0x104 // ff15???????? | $sequence_1 = { c78534ffffff47657457 c78538ffffff696e646f c7853cffffff77546578 66c78540ffffff7457 } // n = 4, score = 900 // 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_2 = { c705????????55736572 c705????????33322e64 66c705????????6c6c c605????????00 } // n = 4, score = 900 // c705????????55736572 | // c705????????33322e64 | // 66c705????????6c6c | // c605????????00 | $sequence_3 = { eb02 33c9 c0e004 02c1 3423 c0c003 } // n = 6, score = 900 // eb02 | jmp 4 // 33c9 | xor ecx, ecx // c0e004 | shl al, 4 // 02c1 | add al, cl // 3423 | xor al, 0x23 // c0c003 | rol al, 3 $sequence_4 = { 8945fc 53 56 57 8d8534ffffff } // n = 5, score = 900 // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 56 | push esi // 57 | push edi // 8d8534ffffff | lea eax, [ebp - 0xcc] $sequence_5 = { 55 8bec 8b450c 3d01020000 } // n = 4, score = 900 // 55 | push ebp // 8bec | mov ebp, esp // 8b450c | mov eax, dword ptr [ebp + 0xc] // 3d01020000 | cmp eax, 0x201 $sequence_6 = { d1f9 68???????? 03c9 51 } // n = 4, score = 800 // d1f9 | sar ecx, 1 // 68???????? | // 03c9 | add ecx, ecx // 51 | push ecx $sequence_7 = { 68???????? 6a1a 68???????? 57 } // n = 4, score = 800 // 68???????? | // 6a1a | push 0x1a // 68???????? | // 57 | push edi $sequence_8 = { 6a02 68???????? 50 a3???????? } // n = 4, score = 800 // 6a02 | push 2 // 68???????? | // 50 | push eax // a3???????? | $sequence_9 = { 8bf0 56 ff15???????? 50 6a40 } // n = 5, score = 700 // 8bf0 | mov esi, eax // 56 | push esi // ff15???????? | // 50 | push eax // 6a40 | push 0x40 $sequence_10 = { 56 ffd3 85c0 7403 83c608 8a06 } // n = 6, score = 700 // 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 = { 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_12 = { ff15???????? 85c0 7405 83c004 } // n = 4, score = 700 // ff15???????? | // 85c0 | test eax, eax // 7405 | je 7 // 83c004 | add eax, 4 $sequence_13 = { 68???????? ff15???????? b8???????? 83c424 8d5002 668b08 } // n = 6, score = 500 // 68???????? | // ff15???????? | // b8???????? | // 83c424 | add esp, 0x24 // 8d5002 | lea edx, [eax + 2] // 668b08 | mov cx, word ptr [eax] $sequence_14 = { e8???????? 68???????? 8d45f4 c745f4682f0110 50 e8???????? cc } // n = 7, score = 100 // e8???????? | // 68???????? | // 8d45f4 | lea eax, [ebp - 0xc] // c745f4682f0110 | mov dword ptr [ebp - 0xc], 0x10012f68 // 50 | push eax // e8???????? | // cc | int3 $sequence_15 = { 83e61f c1f805 c1e606 c1e910 c0e107 8b1485d0a70110 } // n = 6, score = 100 // 83e61f | and esi, 0x1f // c1f805 | sar eax, 5 // c1e606 | shl esi, 6 // c1e910 | shr ecx, 0x10 // c0e107 | shl cl, 7 // 8b1485d0a70110 | mov edx, dword ptr [eax*4 + 0x1001a7d0] $sequence_16 = { 8d8d54ffffff 8d5101 90 8a01 } // n = 4, score = 100 // 8d8d54ffffff | lea ecx, [ebp - 0xac] // 8d5101 | lea edx, [ecx + 1] // 90 | nop // 8a01 | mov al, byte ptr [ecx] $sequence_17 = { 7414 8bc2 c1f805 83e21f c1e206 031485d0a70110 } // n = 6, score = 100 // 7414 | je 0x16 // 8bc2 | mov eax, edx // c1f805 | sar eax, 5 // 83e21f | and edx, 0x1f // c1e206 | shl edx, 6 // 031485d0a70110 | add edx, dword ptr [eax*4 + 0x1001a7d0] $sequence_18 = { 8b048dd0a70110 4e 807d1300 8955e4 c64418050a } // n = 5, score = 100 // 8b048dd0a70110 | mov eax, dword ptr [ecx*4 + 0x1001a7d0] // 4e | dec esi // 807d1300 | cmp byte ptr [ebp + 0x13], 0 // 8955e4 | mov dword ptr [ebp - 0x1c], edx // c64418050a | mov byte ptr [eax + ebx + 5], 0xa $sequence_19 = { 58 668986b8000000 668986be010000 c7466848960110 } // n = 4, score = 100 // 58 | pop eax // 668986b8000000 | mov word ptr [esi + 0xb8], ax // 668986be010000 | mov word ptr [esi + 0x1be], ax // c7466848960110 | mov dword ptr [esi + 0x68], 0x10019648 $sequence_20 = { 2bc2 8bf0 d1fe 6a55 ff34f5e0470110 ff7508 e8???????? } // n = 7, score = 100 // 2bc2 | sub eax, edx // 8bf0 | mov esi, eax // d1fe | sar esi, 1 // 6a55 | push 0x55 // ff34f5e0470110 | push dword ptr [esi*8 + 0x100147e0] // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_21 = { 41 84c0 75f9 2bce 741c 804415ec03 } // n = 6, score = 100 // 41 | inc ecx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 2bce | sub ecx, esi // 741c | je 0x1e // 804415ec03 | add byte ptr [ebp + edx - 0x14], 3 condition: 7 of them and filesize < 612352 }
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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