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Rewterz Threat Advisory – CVE-2019-1955 – Cisco Email Security Appliance Header Injection Vulnerability

September 27, 2019
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Rewterz Threat Alert – Konni’s APT Group Runs Malspam Campaigns

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Rewterz Threat Alert – Divergent: Fileless Malware Using NodeJS

Severity

Medium

Analysis Summary

A new malware loader being used to deliver and infect systems with a previously undocumented malware payload called Divergent. This threat uses NodeJS — a program that executes JavaScript outside of a web browser — as well as the legitimate open-source utility WinDivert to facilitate some of the functionality in the Divergent malware. The use of NodeJS is not something commonly seen across malware families.

The observed malware campaigns associated with Divergent feature the use of persistence techniques most commonly associated with “fileless” malware. This malware can be leveraged by an attacker to target corporate networks and appears to be primarily designed to conduct click-fraud. It also features several characteristics that have been observed in other click-fraud malware, such as Kovter.

Impact

Exposure of sensitive information

Indicators of Compromise

URLs

  • hxxps[:]//1292172017[.]rsc[.]cdn77[.]org/images/trpl[.]png
  • hxxps[:]//1292172017[.]rsc[.]cdn77[.]org/imtrack/strkp[.]png

Malware Hash (MD5/SHA1/SH256)

  • ba04eacaa80bb5da6b02e1e7fdf3775cf5a44a6179b2c142605e089d78a2f5b6
  • a82dd93585094aeba4363c5aeedd1a85ef72c60a03738b25d452a5d895313875
  • 2f4a9ef2071ee896674e3da1a870d4efab4bb16e2e26ea3d7543d98b614ceab9
  • 77498f0ef4087175aa85ce1388f9d02d14aaf280e52ce7c70f50d3b8405fea9f
  • b2d29bb9350a0df93d0918c0208af081f917129ee46544508f2e1cf30aa4f4ce
  • bf2cdd1dc2e20c42d2451c83b8280490879b3515aa6c15ab297419990e017142
  • ba04eacaa80bb5da6b02e1e7fdf3775cf5a44a6179b2c142605e089d78a2f5b6
  • a7656ccba0946d25a4efd96f4f4576494d5f1e23e6ad2acc16d2e684656a2d4f
  • 607b2f3fd1e73788a4d6f5a366c708dbb12d174eba9863ade0af89ca40e1fdba

Remediation

  • Block all threat indicators at your respective controls.
  • Always be suspicious about emails sent by unknown senders.
  • Never click on the link/attachments sent by unknown senders.

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