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    March 17, 2023
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    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
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    Rewterz Threat Advisory – A Second Sample of the Shamoon V3 Wiper

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    • Remote SOC
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    March 17, 2023
    March 17, 2023
    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
    Severity High Analysis Summary Chaos is a customizable ransomware builder that emerged on June 9 2021 (in underground forums) by falsely marketing itself as the .NET […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Advisory – Multiple Adobe ColdFusion Vulnerabilities
    Severity High Analysis Summary CVE-2023-26361 CVSS:4.9 Adobe ColdFusion could allow a remote authenticated attacker to traverse directories on the system. An attacker could send a specially […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Alert – Ursnif Banking Trojan aka Gozi – Active IOCs
    Severity Medium Analysis Summary Ursnif banking trojan also known as Gozi and Dreambot has been around for more than 10 years. It gained popularity in 2015 […]

    Threat Insights

    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.

    Read More

    play_btn_Smallplay_btn_hover_Small
    leadership

    Our Leadership

    Our leadership team brings together years of knowledge and experience in cybersecurity to drive our company's mission and vision. Our team is passionate about delivering high-quality products and services, leading by example and assisting our clients in securing their organization’s environment.
    help

    CSR

    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

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Rewterz Threat Advisory – Phishing Attack faking an Office 365 Non-Delivery Email
December 18, 2018
Rewterz
Rewterz Threat Advisory – Malware Controlled Through Command-containing memes on Twitter
December 19, 2018

Rewterz Threat Advisory – A Second Sample of the Shamoon V3 Wiper

December 19, 2018

SEVERITY: High

 

CATEGORY: Emerging Threat

 

PUBLISH DATE: 19 December, 2018

 

ANALYSIS SUMMARY

 

A second variant of destructive Shamoon V3 wiper has re-emerged after the absence of two years with a more destructive wiping malware (Trojan.Filerase) which will delete and overwrite files on the infected computer, meanwhile the Shamoon itself will erase the master boot record of the computer, making it unusable eventually. The addition of Filerase wiper have made this a more vibrant threat because if the files are erased by the Filerase malware first, they would not be recovered forensically as well.

 

Filerase is spread across the victim’s network from one initial computer using a list of remote computers. This list is in the form of a text file and is unique to each victim, which indicates that the attackers have likely gathered the information from the earlier reconnaissance phase of the attack. This list is first copied by a component called OCLC.exe and passed on to another tool called Spreader.exe. The Spreader component will then copy Filerase to all the computers listed. It will then simultaneously trigger the Filerase malware on all infected machines.

 

When the Trojan is executed, it enumerates all the fixed drives on the compromised computer and then deletes all the files and folders on the fixed drives.

 

For files whose path contains %SystemDrive%\Users or whose path does not contain %SystemDrive% , and whose size is less than 100,000,000 bytes, the Trojan:

Fills the file with random data
Renames the file to a random name
Deletes the file

 

 

IMPACT

 

Erasing Boot record and making the infected computer unusable

 

 

AFFECTED PRODUCTS

 

Microsoft Windows

 

 

THREAT INDICATORS

 

Malware Hash (MD5/SHA1/SH256)

  • 7f608f9783809d0165125a685e9b5537b9343f44b6d117b26be76b48b5c8f6d3
  • c3ab58b3154e5f5101ba74fccfd27a9ab445e41262cdf47e8cc3be7416a5904f
  • 0975eb436fb4adb9077c8e99ea6d34746807bc83a228b17d321d14dfbbe80b03
  • 0694bdf9f08e4f4a09d13b7b5a68c0148ceb3fcc79442f4db2aa19dd23681afe
  • 391e7b90bf3f0bfeb2c2602cc65aa6be4dd1c01374b89c4a48425f2d22fe231c
  • 6985ef5809d0789eeff623cd2436534b818fd2843f09fa2de2b4a6e2c0e1a879
  • ccb1209122085bed5bded3f923835a65d3cc1071f7e4ad52bc5cf42057dd2150
  • dab3308ab60d0d8acb3611bf364e81b63cfb6b4c1783864ebc515297e2297589
  • bc4513e1ea20e11d00cfc6ce899836e4f18e4b5f5beee52e0ea9942adb78fc70
  • fa06a08c36bbd19c80c3831736020823
  • dfb069d22be70888784a81948328ca1da6a7d38f
  • 7f608f9783809d0165125a685e9b5537b9343f44b6d117b26be76b48b5c8f6d3

 

 

REMEDIATION

 

  • Ensure password policy. Complex passwords make it difficult to crack password files.
  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available.
  • Apply up-to-date patches.
  • Disable Autoplay to prevent the automatic execution of executable files and removable drives.
  • Train employees to avoid and not to open attachments unless they’re expecting one.

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Assess

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Transform

  • SOC Consultancy
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  • SIEM Gap Analysis
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  • SOC Content Pack

Train

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  • Tabletop Exercise
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Respond

  • Incident Analysis
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