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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 […]

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    Rewterz Threat Alert – New Mirai Variants could enable DDoS Attacks

    Managed Security Services

    • Managed Security Monitoring
    • Remote SOC
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    Managed Penetration Testing

    Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.

  • Services

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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.

    Connect with Us

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Rewterz
Rewterz Threat Alert – Elusive Ransomware Sodinokibi
August 13, 2019
Rewterz
Rewterz Threat Alert – First Microfinance Bank Targeted by Indian Hackers
August 14, 2019

Rewterz Threat Alert – New Mirai Variants could enable DDoS Attacks

August 13, 2019

Severity

Medium

Analysis Summary

Within a span of three weeks, three notable malware variants of Neko, Mirai, and Bashlite were observed. Upon analyzing Neko botnet sample, then observed another sample with additional exploits the following week. A Mirai variant that calls itself “Asher” surfaced on July 30, then a Bashlite variant called “Ayedz” the following week. These malware variants enlist infected routers to botnets that are capable of launching distributed denial of service (DDoS) attacks.

Neko


A botnet sample, x86.neko (detected by Trend Micro as Backdoor.Linux.NEKO.AB), that brute-forces weak credentials. It then issues the following commands:

image-1565719129.png

The Neko botnet is capable of executing several backdoor commands: it can execute shell commands as well as launch user datagram protocol or UDP and UPD-HEX flood attacks, inundating a router’s ability to properly process and respond to information.

It is also capable of killing processes (the “killer” function is found in its body). Neko also holds within it an extensive kill list of other malware-related processes that it will terminate.

Mirai variant “Asher”


A Mirai variant (detected by Trend Micro as Backdoor.Linux.MIRAI.VWIRC). Typical of Mirai, this variant infects devices with a BusyBox, which is a software suite for devices with limited resources. It first checks for BusyBox presence by executing the “/bin/busybox {any string}” command. If the device’s system responds with “{any string} applet not found,” the bot will proceed with its operation. The malware variant’s authors used the {any string} part to “name” the malware; in this case, they used “Asher.”

Bashlite variant “Ayedz”


A Bashlite variant that seems to refer to itself as “Ayedz” (detected by Trend Micro as Backdoor.Linux.BASHLITE.SMJC, Backdoor.Linux.BASHLITE.SMJC8, and Backdoor.Linux.BASHLITE.SMJC4), based on this malware’s file name. Upon execution, Ayedz will send the following information about the infected device back to the host IP address 167[.]71[.]7[.]231 via port 46216:

fig-14.png

Impact

  • Distributed denial of service (DDoS)
  • Credential theft

Indicators of Compromise

URLs

  • http[:]//185[.]244[.]25[.]200/bins
  • http[:]//185[.]244[.]25[.]200/bins/x86[.]neko


Malware Hash (MD5/SHA1/SH256)

  • 2efae6727d3f5a4a2e7b88ef1e657f6a6e2e6e1c08af0746205dc3c7afe4094d
  • 8e592655cef0dc4a1a209b6f8909a95e2bbf421ecf8312a3b4d07960fb906a5f
  • 754285c82042ca8326be39988fceb39882d301fbcd3533ce31704027c445f72c
  • c3626284fb68b6bf76d212441d88a5a30ae5d98b13a63b9e7358efc8c1c42215
  • ebc2bb1901112c9f957855b25091c21f55a4c7d5f95b3d918f85c1924c8d31b0
  • 86aa444a10c9c0c33a8f94ad71fd9d2b985e2e624872cd1c351aeaa7a4d6645f
  • 416dada9ab2ae2f160363965540d5776dc2fb4e086064d97d95a11c4a90c67cd
  • c81cbf35dbbe2502b32ce02cc55c307b6036d9d10f7d7a0a6da127592caeaf0a
  • 5df2af777ba958b7180b71fc365595141582d8604eba7c70f635a38139503439
  • abea038f41b83f00e61e829df39c4b85453335cb9a70619702a6b9834bc7d591
  • b3434897b35c52551329a2f8e322d1fc1be618959794d6f4bff299c7e1ce2324
  • 8cbcc1af312511ebaaba24a075333835e0ac4c4754072233bccadbb996d84048
  • 329f507ceb4ed9d6a6cb5ba5e9bc6a863ef2fd12235f6ed5d46fe3ebc04cf337
  • 6df1610476044ab8c3e615ddaf66e51cfe5f4a3436f37ad15fa4f6583e83fe63
  • b382dce55bbc08b0f5ac7bbb231e55bb65f07e795cd6d382d9bb01b293ef2233
  • 86717399a76d07b72733abb2c88cefe2d2a8c3c451d758f7c8b5249ab21b9e26
  • 355df8452d6853cbf3ed44f82967d353b709b4bd04afb96de4c4a51471c0771d
  • 16ebe7836ce650db686ca62d62901b771788d8ef78b7ba0a10aa73e68a710dd5
  • 30d429d048a4f6ec86f48b4cd0955e0003b832213694cfa121b95e4c429d7980
  • f1571b3c47ab0aeff1e8094f2e1a1da604c6867409b8509ef90333ca1e9775e1
  • a2c8e598e340cc7cc27b4c045129abd9b04ddd3a592c0c41ae5c82f777b59b30
  • 55355482d12b60136fde3f5d76b2686337e4bab5248e79cf3a6b2d652a290240
  • 7ca9af2d71719134aa7cf8ca37d9fe35f4b20f2e5d6721e1d57f6e570e845669
  • a9a5262048664843edf9e2bc405f06949cb9354ab20f5efb23dd2800c0dd4681

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.

Platform

  • Rewterz XDR
  • Rewterz Defense
  • Rewterz Threat Intelligence

Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
  • Onsite SOC
  • Hybrid SOC

Assess

  • Compromise Assessment
  • APT Assessment
  • Penetration Testing
  • Architecture Design & Review
  • Red Team Assessment
  • Purple Team Assessment
  • Social Engineering
  • Source Code Review

Transform

  • SOC Consultancy
  • SOC Maturity Assessment
  • SOC Model Evaluation
  • SOC Gap Analysis
  • SIEM Gap Analysis
  • SIEM Optimization
  • SOC Content Pack

Train

  • Simulated Cyber Attack Exercise
  • Tabletop Exercise
  • Security Awareness and Training

Respond

  • Incident Analysis
  • Incident Response

Threat Insights

  • Threat Advisories
  • Monthly Threat Insights
  • Threat Intelligence Reports

Resources

  • Blog
  • Press Releases

Connect With Us

  • Contact
  • Careers
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