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    Rewterz Threat Alert – Nemty Ransomware Delivered via Trik Botnet Using SMB Protocol

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    Rewterz Threat Alert -New Golang-Based Botnet GoBruteforcer Breaches Web Servers – Active IOCs
    Severity High Analysis Summary According to researchers, a Golang-based botnet named GoBruteforcer has been discovered, which is specifically targeting web servers running FTP, MySQL, phpMyAdmin, and […]
    March 15, 2023
    March 15, 2023
    Rewterz Threat Alert – DarkComet RAT (Remote Access Trojan) – Active IOCs
    Severity High Analysis Summary DarkComet RAT (Remote Administration Tool) is a type of malware that is designed to allow attackers to gain remote access to a […]
    March 15, 2023
    March 15, 2023
    Rewterz Threat Advisory -Multiple Microsoft Windows Products Vulnerabilties
    Severity High Analysis Summary CVE-2023-23410 CVSS:7.8 Microsoft Windows could allow a local authenticated attacker to gain elevated privileges on the system, caused by a flaw in […]

    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

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    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 Alert – Nemty Ransomware Delivered via Trik Botnet Using SMB Protocol

November 6, 2019

Severity

High

Analysis Summary

Nemty ransomware has partnered with Trik botnet which delivers Nemty to compromised computers. The criminals behind the botnet use the infected computers to send email spam and have been observed pushing out a wide range of malware families, now including Nemty. In the past, Nemty has been observed being spread via the RIG exploit kit, as well as via malicious spam campaigns targeting users in Korea and China, where the malware is attached inside an archive. 36% targets are located in China while Korea houses 40% of Nemty’s targets.

We observed a recent version of Trik delivering a tiny component that uses the Server Message Block (SMB) protocol and a list of hardcoded credentials to try to connect to remote computers with port 139 open.

First, the SMB component creates a registry entry. Trik then checks if the file winsvcs.txt is present or not in the %AppData% directory on the compromised computer. If winsvcs.txt is not present, the Nemty ransomware is downloaded and executed. If winsvcs.txt is present, the SMB component checks if it is running as a service or not. If it is not running as a service, the component tries to spread itself through the SMB protocol. To find targets, the SMB component generates random IP addresses then tries to connect to them on port 139. The malware can infect public IP addresses with port 139 open that are using any of the common administrator usernames and passwords on its list. If access is granted, the malware uses the SMB protocol to copy itself to the remote machine. It then uses the Windows Service Control Manager to start the SMB component’s process on the remote machine. It deletes shadow copies and backups before, rather than after encryption.

The developers behind the Nemty ransomware are constantly updating and improving its code, as well as its delivery methods, in an attempt to reach more victims.

Impact

  • Files Encryption
  • Unauthorized Access

Indicators of Compromise

MD5

  • 6c05aa998d0523f2855769bd30b2d0d1
  • 7334c27a6a2531b01ec94922160b87cf
  • a24bb61df75034769ffdda61c7a25926
  • e3b9f2863742a134506a017edbd09594
  • 80f5f2296cae3bea63fc14a867d97dd4
  • 3282f6c806a89359ec94f287cf6c699c
  • 95a2272ee95654fd51b5351811f3d989
  • 89eadd686c2dff611578028a608a6168
  • 51960de3286cf12fc93374cc8b87dd90
  • bb08689787fcb4bc029679acd1708177
  • 4297543f5744a0d90a1e5504fc807927
  • 76291be32823737f50c0a2593567019e
  • a37356a3804652f5484b891de66925e1
  • 712a19e062672ca95f393732f9250b6e
  • 36a8bf060f86867226c4268b41965e48
  • 87f19914a9966998a89839dbdc978d4f
  • ab97f71125a89d4d3d0855b8a419d3e1
  • f8dcf54aa841455db600fd9dd5243727
  • c6eeb9b0ffc0dcb664a25a4b3b0b4d40

SH256

  • 62c3b52b5310393dbf0590bc246161249632a1d2f21c3aa7fb779dc8018a0edf
  • 5078a0940abc31a7fa271483ac345044a91a0e21c517bceb85091cd3fca310f7
  • 0c77b260ee3fdd2754cd4f289efce709519aad34fa3cb84663655a6240e45973
  • 1ab8feefd67f3706a42f996a3291d24a7ab2c5eb67d98236eb73995d587576ad
  • 3ecb650c471d7c8291d084fffd634da0eddc9a473d29792d5033fe5fdcbf4ddd
  • 64d187bed40d023e14d41b1a80d528f5c12dcf743fcb4de91530567d3244e09e
  • 77689e7752470501d26cf8a5e2eb9b4e1ac372b27b2151268e0acf024e355f99
  • 81dab2787f72997afb09fb98ada159f78c3e93f9d3fa83f844e580620d08322a
  • 87fb207ae29baa300c2377625b745667a516e2243e1904ef81b4f7b97b5da1b0
  • 9875c102bbe89ad636096efca6b04d6b843529eb9717d822f7b0b42a087c7332
  • a0170a01e656cf7089a0d68a1803c3e2ba64ba8996c8eb5ffa8098940cb4c0ec
  • b9b4511065cb56bd162e143c22cf2afe32e3ee6617ba5a4852182cb0781f18f1
  • c6f43bedad8b0c3f60d71a2a6c1fab297e144483f17deeb5150bdbe6c73755a4
  • d746e41e18bb637062881aca207186dc3d005e79c857e025f89ce2a1b3e52ecf
  • d9edee0541b9a5baf2cb2b1915aef1d034efd4edd4b3c030b508669da1e2aaf2
  • db627ff946ff64910cf909c81ae51294c4bb6477ee2c620aae1d0f7a7208b6b5
  • f4909c420e208e4728116e8b0f4254c9f741d864f9618cddbe3f51b71f602066
  • fa2993f2455971244350178008cc671fb739b53d79b594c80e69047421ce1666
  • bf480a5862210b9e033f270379bb95c1d1fadd16bf0d21db5bfbc9268ae595ac

Remediation

  • Block the threat indicators at their respective controls.
  • Do not download email attachments/click on URLs coming from untrusted email addresses.
  • Actively monitor Port 139.

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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