Kegaduhan Ransomware wannacry
Akhir-akhir ini, dunia cyber telah kedatangan malware baru yang sangat masif, yaitu Ransomware Wannacry. Konon katanya sudah terdeteksi menyebar di 90-an negara. Di luar negeri yang
sudah menjadi korban diantaranya berbagai rumah sakit di USA, beberapa
Bank di Rusia, jaringan komputer kereta di Jerman dll. Bahkan, negara ratu elisabeth (inggris) sudah menjadi target serangan. Untuk indonesia sendiri gimana? Indonesia yang
sudah melapor kena infeksi ransomware ini beberapa komputer rumah sakit
dan beberapa komputer di pemerintah daerah. Bahkan Kominfo (kementerian
komunikasi dan informatika ) di hari libur ini juga mengeluarkan press release tentang malware ini.
Malware ini kerjanya mengenkrip file di komputer korban, sehingga
file kita gak bisa dibuka. Yah mungkin analoginya kayak file kita dizip
oleh malware terus dikasih password. Untuk ngedapatin password tersebut
kita harus bayar dulu uang tebusan (ransom) ke penjahat yang bikin
malware ini. Tipe malware seperti ini disebut Ransomware.
Ransomware wannacry ini menginfeksi lewat email phishing. Jadi
misalnya kita dapat email gak jelas kemudian di email tersebut ada
attachment atau sebuah link website, ya sebaiknya jangan dibuka. hanya selain itu dia bisa menyebar lewat smb (buat file sharing). Jadi
misalnya ada satu komputer terinfeksi malware ini, maka malware ini bisa
nyebar ke seluruh komputer yang ada di jaringan.
Cara pencegahan
Menurut microsoft, hampir semua versi windows kecuali windows 10 rentan terhadap serangan ransomware ini. Microsft juga telah mengeluarkan update untuk mengatasi masalah ini. Ada beberapa langkah pencegahan yang bisa dilakukan supaya tidak terinfeksi malware ini:- Install MS17-010 Patch
- Disable SMBv1
- Block Ports 139/445 & 3389
https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
Untuk mematikan SMBv1 bisa dilihat pada link berikut:
https://support.microsoft.com/en-us/help/2696547/how-to-enable-and-disable-smbv1,-smbv2,-and-smbv3-in-windows-vista,-windows-server-2008,-windows-7,-windows-server-2008-r2,-windows-8,-and-windows-server-2012
Tulisan lengkap tentang malware ini bisa dilihat pada site berikut: (Bahkan ada sampel malwarenya juga)
WannaCry|WannaDecrypt0r NSA-Cyberweapon-Powered Ransomware Worm
- Virus Name: WannaCrypt, WannaCry, WanaCrypt0r, WCrypt, WCRY
- Vector: All Windows versions before Windows 10 are vulnerable if not patched for MS-17-010. It uses EternalBlue MS17-010 to propagate.
- Ransom: between $300 to $600. There is code to 'rm' (delete) files in the virus. Seems to reset if the virus crashes.
- Backdooring: The worm loops through every RDP session on a system to run the ransomware as that user. It also installs the DOUBLEPULSAR backdoor. It corrupts shadow volumes to make recovery harder. (source: malwarebytes)
- Kill switch: If the website
www.iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.comis up the virus exits instead of infecting the host. (source: malwarebytes). This domain has been sinkholed, stopping the spread of the worm.
Microsoft first patch for XP since 2014: https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
Killswitch source: https://blog.malwarebytes.com/threat-analysis/2017/05/the-worm-that-spreads-wanacrypt0r/ https://www.malwaretech.com/2017/05/how-to-accidentally-stop-a-global-cyber-attacks.html
Infections
- NHS (uk) turning away patients, unable to perform x-rays. (list of affected hospitals)
- Nissan (uk) http://www.chroniclelive.co.uk/news/north-east-news/cyber-attack-nhs-latest-news-13029913
- Telefonica (spain) (https://twitter.com/SkyNews/status/863044193727389696)
- power firm Iberdrola and Gas Natural (spain)
- FedEx (us) (https://twitter.com/jeancreed1/status/863089728253505539)
- University of Waterloo (us)
- Russia interior ministry & Megafon (russia) https://twitter.com/dabazdyrev/status/863034199460261890/photo/1
- VTB (russian bank) https://twitter.com/vassgatov/status/863175506790952962
- Russian Railroads (RZD) https://twitter.com/vassgatov/status/863175723846176768
- Portugal Telecom
- Сбербанк - Sberbank Russia (russia)
- Shaheen Airlines (india, claimed on twitter)
- Train station in frankfurt (germany)
- Neustadt station (germany)
- the entire network of German Rail seems to be affected (@farbenstau)
- in China secondary schools and universities had been affected (source)
- A Library in Oman (@99arwan1)
- China Yanshui County Public Security Bureau (https://twitter.com/95cnsec/status/863292545278685184)
- Renault (France) (http://www.lepoint.fr/societe/renault-touche-par-la-vague-de-cyberattaques-internationales-13-05-2017-2127044_23.php) (http://www.lefigaro.fr/flash-eco/2017/05/13/97002-20170513FILWWW00031-renault-touche-par-la-vague-de-cyberattaques-internationales.php)
- Schools/Education (France) https://twitter.com/Damien_Bancal/status/863305670568837120
- University of Milano-Bicocca (italy)
- A mall in singapore https://twitter.com/nkl0x55/status/863340271391580161
- ATMs in china https://twitter.com/95cnsec/status/863382193615159296
- norwegian soccer team ticket sales https://www.nrk.no/telemark/eliteserieklubber-rammet-av-internasjonalt-dataangrep-1.13515245
Malware samples
- hxxps://www.hybrid-analysis.com/sample/ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa?environmentId=100
- hxxps://transfer.sh/PnDIl/CYBERed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa.EXE
- hxxps://transfer.sh/ZhnxR/CYBER1be0b96d502c268cb40da97a16952d89674a9329cb60bac81a96e01cf7356830.EXE (main dll)
- parents https://pastebin.com/quvVH5hS (all known variants of the Wcry launcher containing eternalblue)
- children https://pastebin.com/A2pxw49F (all variants of Wcry, the actual ransomware, being currently observed in the wild)
Informative Tweets
- Sample released by ens: https://twitter.com/the_ens/status/863055007842750465
- Onion C&Cs extracted: https://twitter.com/the_ens/status/863069021398339584
- EternalBlue confirmed: https://twitter.com/kafeine/status/863049739583016960
- Shell commands: https://twitter.com/laurilove/status/863065599919915010
- Maps/stats: https://twitter.com/laurilove/status/863066699888824322
- Core DLL: https://twitter.com/laurilove/status/863072240123949059
- Hybrid-analysis: https://twitter.com/PayloadSecurity/status/863024514933956608
- Impact assessment: https://twitter.com/CTIN_Global/status/863095852113571840
- Uses DoublePulsar: https://twitter.com/laurilove/status/863107992425779202
- Your machine is attacking others: https://twitter.com/hackerfantastic/status/863105127196106757
- Tor hidden service C&C: https://twitter.com/hackerfantastic/status/863105031167504385
- FedEx infected via Telefonica? https://twitter.com/jeancreed1/status/863089728253505539
- HOW TO AVOID INFECTION: https://twitter.com/hackerfantastic/status/863070063536091137
- More of this to come: https://twitter.com/hackerfantastic/status/863069142273929217
- C&C hosts: https://twitter.com/hackerfantastic/status/863115568181850113
- Crypted files will be deleted after countdown: https://twitter.com/laurilove/status/863116900829724672
- Claim of attrib [take with salt]: https://twitter.com/0xSpamTech/status/863058605473509378
- Track the bitcoins: https://twitter.com/bl4sty/status/863143484919828481
- keys in pem format: https://twitter.com/e55db081d05f58a/status/863109716456747008
Cryptography details
- Each infection generates a new RSA-2048 keypair.
- The public key is exported as blob and saved to 00000000.pky
- The private key is encrypted with the ransomware public key and saved as 00000000.eky
- Each file is encrypted using AES-128-CBC, with a unique AES key per file.
- Each AES key is generated CryptGenRandom.
- The AES key is encrypted using the infection specific RSA keypair.
- https://haxx.in/key1.bin (the ransomware pubkey, used to encrypt the users private key)
- https://haxx.in/key2.bin (the dll decryption privkey) the CryptImportKey() rsa key blob dumped from the DLL by blasty.
Bitcoin ransom addresses
3 addresses hard coded into the malware.- https://blockchain.info/address/13AM4VW2dhxYgXeQepoHkHSQuy6NgaEb94
- https://blockchain.info/address/12t9YDPgwueZ9NyMgw519p7AA8isjr6SMw
- https://blockchain.info/address/115p7UMMngoj1pMvkpHijcRdfJNXj6LrLn
C&C centers
gx7ekbenv2riucmf.onion57g7spgrzlojinas.onionxxlvbrloxvriy2c5.onion76jdd2ir2embyv47.onioncwwnhwhlz52maqm7.onion
Languages
All language ransom messages available here: https://transfer.sh/y6qco/WANNACRYDECRYPTOR-Ransomware-Messages-all-langs.zipm_bulgarian, m_chinese (simplified), m_chinese (traditional), m_croatian, m_czech, m_danish, m_dutch, m_english, m_filipino, m_finnish, m_french, m_german, m_greek, m_indonesian, m_italian, m_japanese, m_korean, m_latvian, m_norwegian, m_polish, m_portuguese, m_romanian, m_russian, m_slovak, m_spanish, m_swedish, m_turkish, m_vietnamese
File types
There are a number of files and folders wannacrypt will avoid. Some because it's entirely pointless and others because it might destabilize the system. During scans, it will search the path for the following strings and skip over if present:- "Content.IE5"
- "Temporary Internet Files"
- " This folder protects against ransomware. Modifying it will reduce protection"
- "\Local Settings\Temp"
- "\AppData\Local\Temp"
- "\Program Files (x86)"
- "\Program Files"
- "\WINDOWS"
- "\ProgramData"
- "\Intel"
- "$"
.doc, .docx, .xls, .xlsx, .ppt, .pptx, .pst, .ost, .msg, .eml, .vsd, .vsdx, .txt, .csv, .rtf, .123, .wks, .wk1, .pdf, .dwg, .onetoc2, .snt, .jpeg, .jpg, .docb, .docm, .dot, .dotm, .dotx, .xlsm, .xlsb, .xlw, .xlt, .xlm, .xlc, .xltx, .xltm, .pptm, .pot, .pps, .ppsm, .ppsx, .ppam, .potx, .potm, .edb, .hwp, .602, .sxi, .sti, .sldx, .sldm, .sldm, .vdi, .vmdk, .vmx, .gpg, .aes, .ARC, .PAQ, .bz2, .tbk, .bak, .tar, .tgz, .gz, .7z, .rar, .zip, .backup, .iso, .vcd, .bmp, .png, .gif, .raw, .cgm, .tif, .tiff, .nef, .psd, .ai, .svg, .djvu, .m4u, .m3u, .mid, .wma, .flv, .3g2, .mkv, .3gp, .mp4, .mov, .avi, .asf, .mpeg, .vob, .mpg, .wmv, .fla, .swf, .wav, .mp3, .sh, .class, .jar, .java, .rb, .asp, .php, .jsp, .brd, .sch, .dch, .dip, .pl, .vb, .vbs, .ps1, .bat, .cmd, .js, .asm, .h, .pas, .cpp, .c, .cs, .suo, .sln, .ldf, .mdf, .ibd, .myi, .myd, .frm, .odb, .dbf, .db, .mdb, .accdb, .sql, .sqlitedb, .sqlite3, .asc, .lay6, .lay, .mml, .sxm, .otg, .odg, .uop, .std, .sxd, .otp, .odp, .wb2, .slk, .dif, .stc, .sxc, .ots, .ods, .3dm, .max, .3ds, .uot, .stw, .sxw, .ott, .odt, .pem, .p12, .csr, .crt, .key, .pfx, .der
credit herulume, thanks for extracting this list from the binary.
more details came from https://pastebin.com/xZKU7Ph1 thanks to cyg_x11
Some other interesting strings
BAYEGANSRV\administrator Smile465666SA wanna18@hotmail.comcredit: nulldot https://pastebin.com/0LrH05y2
Encrypted file format
<64-bit signature=""> - WANACRY!
- 256 for 2048-bit keys, cannot exceed 4096-bits
- 256 bytes if keys are 2048-bits
<32-bit value=""> - unknown
<64 bit="" file="" size=""> - return by GetFileSizeEx
- with custom AES-128 in CBC mode
64>32-bit> 64-bit>
credit for reversing this file format info: cyg_x11Vulnerability disclosure
The specific vulnerability that it uses to propagate is ETERNALBLUE.This was developed by "equation group" an exploit developer group associated with the NSA and leaked to the public by "the shadow brokers". Microsoft fixed this vulnerability March 14, 2017. They were not 0 days at the time of release.
- https://blogs.technet.microsoft.com/msrc/2017/04/14/protecting-customers-and-evaluating-risk/
- https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
Hasil analisa malware ini menurut McAFee
Hasil analisa lainnya menurut Cisco Talos
Catet : Jangan Nyalakan PC Kantor Anda Besok Pagi....Cegah terlebih dahulu.
sumber : https://gist.githubusercontent.com

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