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Rewterz Threat Alert – Operation Overtrap – Bottle Exploit Kit and Brand-New Cinobi Banking Trojan

Severity

High

Analysis Summary

A new campaign now called “Operation Overtrap” is found infecting victims with its payload. Online Banking Users are being targeted Via Bottle Exploit Kit and Brand-New Cinobi Banking Trojan. The campaign mainly targets online users of various Japanese banks by stealing their banking credentials using a three-pronged attack. The campaign uses three different attack vectors to steal its victims’ banking credentials: 

• By sending spam emails with a phishing link to a fake banking website 

• By sending spam emails asking victims to execute a disguised malware’s executable downloaded from a linked phishing page. 

• By using a custom exploit kit to deliver malware via malvertising 

Below is the work flow of operation overtrap.

image-1583992404.png

It exploits CVE-2018-15982, a Flash Player use after free vulnerability, as well as CVE-2018-8174, a VBScript remote code execution vulnerability. Victims will be infected with BottleEK’s payload if they access this particular exploit kit’s landing page with unpatched or outdated browsers.

Cinobi has two versions — the first one has a DLL library injection payload that compromises victims’ web browsers to perform form-grabbing. This Cinobi version can also modify web traffic sent to and received from targeted websites. Our investigation found that all the websites that this campaign targeted were those of Japan-based banks. Aside from form-grabbing, it also has a webinject function that allows cybercriminals the ability to modify accessed webpages. The second version has all the capabilities of the first one plus the ability to communicate with a command-and-control (C&C) server over the Tor proxy.

Impact

  • Credential Theft
  • Information Theft
  • Manipulation of web pages 

Indicators of Compromise

Domain Name

  • bank-japanpostjp[.]com
  • ts3cardd[.]com
  • safety-amazon[.]jp
  • jp-bank-japanossts[.]jp
  • jp-bamk[.]jp
  • security-amazon[.]jp
  • japanp0st[.]jp
  • bank-japanpost[.]com
  • bank-japanpostpo[.]jp
  • safetb-amazon[.]jp
  • bank-japanposst[.]jp
  • view[.]inteleksys[.]com
  • cionx[.]inteleksys[.]com
  • shop[.]inteleksys[.]com
  • priv[.]inteleksys[.]com

MD5

  • d938fa218caf1348b1a4851eb99ed6dd
  • 14ee556ef1d4451857365cc0cf407ddf
  • 0c206094d6e397c416c4a93773ce4645
  • ee98ef74c496447847f1876741596271
  • e65322b4add2e5183616ce283e99614f
  • 6127fd0843ad7f5cc4488a52ef49bc11
  • 76f099ad94acf28d3eb1341804855824

SHA-256

  • 01bf58c650b6ba30733c14026fcff4ecfc24becdd05637a84ef2a7e86aff3fe0
  • 7f505a1064ea09daba577aa553efbf3385c890ab5aac2ace6ef3e927f480fb87
  • 96e91a1f656fb70339f8f4e383e7f967d25c1a414f436ddffc692518ace579ad
  • 914eb64b93cbb631c710ef6cbd0f9cedf93415be421ccc6e285b288b87f3a246
  • c1b67a30119107365c4a311479794e07afb631980a649749501cb9f511fb0ab4
  • a9ea7e952ce38bf8bc14114325ca2a1bfed16f63798028565a669808b8b728dc
  • ed7b5c16cb5c4f56b3ded279688b693ec52389cacc0b81e940b0591b7f68aa84

URL

  • http[:]//sales[.]inteleksys[.]com/file/vbs[.]vbs

Remediation

  • Block the threat indicators at their respective controls.
  • Do not download email attachments from untrusted sources. 
  • Do not click on URLs attached in untrusted emails. 
  • Do not use outdated browsers.
  • Keep all systems and software patched against all known vulnerabilities. 
  • Verify a website’s legitimacy before entering credentials and banking information.