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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 […]

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    Rewterz Threat Alert –ServHelper Backdoor – Active IOCs

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    • 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.

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    March 15, 2023
    March 15, 2023
    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

    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
Rewterz Threat Alert –GandCrab Ransomware – Active IOCs
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Rewterz Threat Alert –ServHelper Backdoor – Active IOCs

August 16, 2021

Severity

High

Analysis Summary

ServHelper that is associated with the hacking group TA505 has been seen targeting financial and retail sectors. With the help of this backdoor, it enabled them to install and deploy other malware like Information Stealers (Predator Stealer), and Remote Access Trojans (RAT) (FlawedAmmy, NetSupport). It is delivered via NSIS installer, which, typically arrives as an attachment to a lure-based email. The loader checks to see if it is running in a virtualized environment to evade analysis techniques. It does this by checking for the presence of a Windows Defender file known to be present in virtualized environments. If this file is present, the installation will stop. If the file is not present, the installation proceeds. A PowerShell script contained within the NSIS installer’s directory is then executed. This script decrypts and invokes the main installer of ServHelper. Encryption is done with a combination of Base64 encoding and Triple DES Algorithm. This prevents commands from appearing in plain text. A further set of verification checks are done. The installer checks to ascertain if the instance has administrator privileges. If not, the installer will attempt to escalate privilege using DLL hacking with the assistance of Fubuki from UACME. This readily available collection of tools is typically used by penetration testers for research and privilege escalation. The installer also checks to see if the ROM size is greater than 2MB. If there is no ROM file, the installation stops as this is an indicator of virtualization. Once all components are decrypted, dropped, and installed, the ServHelper DLL is loaded. This specific variant only targets 64-bit Windows Operating Systems. Once the installation is complete, threat actors have backdoor access and are able to send and receive information.

Impact

  • Cryptomining
  • File Encryption
  • Information Theft
  • Exposure of Sensitive Data

Indicators of Compromise

Domain Name

  • www[.]wheredoyougo[.]cn
  • www[.]sdfisdgj[.]xyz
  • www[.]pgf5ga4g4b[.]cn
  • www[.]novacation[.]cn
  • www[.]dsfamsi4b[.]cn
  • www[.]asdjausg[.]cn
  • www[.]afspfigjeb[.]cn
  • wheredoyougo[.]cn
  • sagbbrrww2[.]cn
  • pgf5ga4g4b[.]cn
  • homate[.]xyz
  • geyaeb[.]dev
  • dssagrgbe3irggg[.]xyz
  • dsgiutugagb[.]cn
  • dsfamsi4b[.]cn
  • asdjausg[.]cn

MD5

  • 0e297ffe25ebc5a6a3bbfef67b5d8cf4
  • 04c08c702330905419267ac490b9850d
  • ef90d0408ea2487d3c33aa5de3657008
  • 8cd1ffe390e6308913b93c73fdcbe728
  • b80e44d9eedd5fff1cd3ff0cfc1258af
  • 993d53f22ea3cbca3bb1e6ba194bf50f
  • 2b83bcf4d12f4c6937aae132573f87ec
  • f4dc36def934cfc42e86dbd958bddce6
  • a4edfae2aeafcee7c8d45928826c3a99
  • 9e3905e054e78547ec4fbbbb73e92b78

SHA-256

  • fea63897b4634538e9e73c0f69c2e943aebc8cebcffc1415f5ce21207fdfef92
  • fe40b63a00a7d737baa87f493751a1b92ac782baaef2304b0ae65c5a1cbec58d
  • f80df34accc8780a1eb9c733e4e5e5874cce6ad22e57ec8b827aa7f28318c5d1
  • f36277c6faaed23129efacc83847153091cd1ef0b05650e0b8c29d13d95182a5
  • f00f8b0d2602fc2e8bcf5899377f6a23beae9ea9df2c0a3c4e9aad4cae2ef522
  • db710c90eaa2f83be99f1004b9eda6cfbf905a1ab116d1738a89f4eac443f4fe
  • baad7552e8fc0461babc0293f7a3191509b347596d9ca8d2a82560992ff2c48e
  • 9c7fc1304f9dada69594f64d230cb20ce3c1f83a41ca0e27b6274361941b3c67
  • 7516b2271e4a887156d52f661cdfc561fded62338a72b56f50bf188c2f5f222a
  • 5d4a0661cfb3cca59acd8a9fa433ec2c48d686da36f3890b73e7b9f37c60e980

SHA1

  • 375de17ddda72306eb788c17820a7a97089a01e5
  • 5f89aed32a0039773357216efe138dd6baef27bf
  • 77d3d06c04e9c028e98e879bbd45f238dcd1c12c
  • 2274dd05970bdf13a28f30c288b8e313720e6ef7
  • 492003201b7f1a0a12230f2e245718de81bbad78
  • ad4cf03948ec8b94fa997e261468dbe77bbaea8d
  • 1a7759e91970f706d8b3d508415df8003d7ff585
  • a26e5d7cd36a99561086951632ee3785d7cd2d89
  • aec271a1282a7f489c32ec22935d0301fe1f14c8
  • 57ced4325a4f1c93d6928e560e5c7209a4ed0282

URL

  • http[:]//ww16[.]enroter1984[.]cn/bif/b[.]php
  • http[:]//novacation[.]cn/juytfft/b[.]php
  • http[:]//bromide[.]xyz/ssh[.]zip
  • http[:]//beautyiconltd[.]cn/rigged[.]txt
  • http[:]//beautyiconltd[.]cn/cnf[.]txt
  • http[:]//94[.]158[.]245[.]88/mae/start[.]vbs
  • http[:]//94[.]158[.]245[.]88/mae/ready[.]ps1
  • http[:]//94[.]158[.]245[.]88/mae/Get-Content[.]ps1
  • http[:]//94[.]158[.]245[.]88/drc[.]ps1
  • http[:]//93[.]157[.]63[.]171/al[.]exe
  • http[:]//91[.]212[.]150[.]205/al[.]exe
  • http[:]//45[.]61[.]136[.]223/get/m5[.]php

Remediation

  • Block all threat indicators at your respective controls.
  • Search for IOCs in your environment.

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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