Actor(s): Dropping Elephant
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rule win_badnews_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { ff15???????? 50 e8???????? 83c404 68???????? 6804010000 ff15???????? } // n = 7, score = 1000 // ff15???????? | // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 68???????? | // 6804010000 | push 0x104 // ff15???????? | $sequence_1 = { c705????????33322e64 66c705????????6c6c c605????????00 ff15???????? } // n = 4, score = 900 // c705????????33322e64 | // 66c705????????6c6c | // c605????????00 | // ff15???????? | $sequence_2 = { 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, dword ptr [ebp - 0xcc] $sequence_3 = { 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_4 = { 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_5 = { 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_6 = { 6a00 d1f9 68???????? 03c9 } // n = 4, score = 800 // 6a00 | push 0 // d1f9 | sar ecx, 1 // 68???????? | // 03c9 | add ecx, ecx $sequence_7 = { 68???????? 6a1a 68???????? 57 } // n = 4, score = 800 // 68???????? | // 6a1a | push 0x1a // 68???????? | // 57 | push edi $sequence_8 = { 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_9 = { 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_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 = { 8bf0 56 ff15???????? 50 6a40 } // n = 5, score = 700 // 8bf0 | mov esi, eax // 56 | push esi // ff15???????? | // 50 | push eax // 6a40 | push 0x40 $sequence_12 = { 68???????? ff15???????? b8???????? 83c424 8d5002 668b08 83c002 } // n = 7, score = 500 // 68???????? | // ff15???????? | // b8???????? | // 83c424 | add esp, 0x24 // 8d5002 | lea edx, dword ptr [eax + 2] // 668b08 | mov cx, word ptr [eax] // 83c002 | add eax, 2 $sequence_13 = { 8b8d24e5ffff 8b0485d0a70110 f644010480 0f8432030000 e8???????? 33c9 8b406c } // n = 7, score = 100 // 8b8d24e5ffff | mov ecx, dword ptr [ebp - 0x1adc] // 8b0485d0a70110 | mov eax, dword ptr [eax*4 + 0x1001a7d0] // f644010480 | test byte ptr [ecx + eax + 4], 0x80 // 0f8432030000 | je 0x338 // e8???????? | // 33c9 | xor ecx, ecx // 8b406c | mov eax, dword ptr [eax + 0x6c] $sequence_14 = { 50 53 8d85f4ebffff 50 8b8528e5ffff 8b0485d0a70110 } // n = 6, score = 100 // 50 | push eax // 53 | push ebx // 8d85f4ebffff | lea eax, dword ptr [ebp - 0x140c] // 50 | push eax // 8b8528e5ffff | mov eax, dword ptr [ebp - 0x1ad8] // 8b0485d0a70110 | mov eax, dword ptr [eax*4 + 0x1001a7d0] $sequence_15 = { c0e107 8b1485d0a70110 8a443224 247f 0ac8 884c3224 } // n = 6, score = 100 // c0e107 | shl cl, 7 // 8b1485d0a70110 | mov edx, dword ptr [eax*4 + 0x1001a7d0] // 8a443224 | mov al, byte ptr [edx + esi + 0x24] // 247f | and al, 0x7f // 0ac8 | or cl, al // 884c3224 | mov byte ptr [edx + esi + 0x24], cl $sequence_16 = { ff15???????? 8986309f0110 83c604 83fe28 72e6 } // n = 5, score = 100 // ff15???????? | // 8986309f0110 | mov dword ptr [esi + 0x10019f30], eax // 83c604 | add esi, 4 // 83fe28 | cmp esi, 0x28 // 72e6 | jb 0xffffffe8 $sequence_17 = { 8d4901 84c0 75f6 a1???????? 8d958cfeffff } // n = 5, score = 100 // 8d4901 | lea ecx, dword ptr [ecx + 1] // 84c0 | test al, al // 75f6 | jne 0xfffffff8 // a1???????? | // 8d958cfeffff | lea edx, dword ptr [ebp - 0x174] $sequence_18 = { 8bf7 2b349dd0a70110 c1fe06 8bc3 c1e005 } // n = 5, score = 100 // 8bf7 | mov esi, edi // 2b349dd0a70110 | sub esi, dword ptr [ebx*4 + 0x1001a7d0] // c1fe06 | sar esi, 6 // 8bc3 | mov eax, ebx // c1e005 | shl eax, 5 $sequence_19 = { 56 e8???????? 83c40c 8934fd009e0110 eb07 56 } // n = 6, score = 100 // 56 | push esi // e8???????? | // 83c40c | add esp, 0xc // 8934fd009e0110 | mov dword ptr [edi*8 + 0x10019e00], esi // eb07 | jmp 9 // 56 | push esi $sequence_20 = { 8945e0 8d8080980110 8945e4 803800 8bc8 7435 } // n = 6, score = 100 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8d8080980110 | lea eax, dword ptr [eax + 0x10019880] // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 803800 | cmp byte ptr [eax], 0 // 8bc8 | mov ecx, eax // 7435 | je 0x37 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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