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    Rewterz Threat Alert – Buhtrap Group uses Zero Day in latest Espionage Campaigns

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    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
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    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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    pdf-file (1)
    Annual Threat Intelligence Report 2022
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  • Why Rewterz?

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    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

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July 12, 2019
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Rewterz Threat Alert – Buhtrap Group uses Zero Day in latest Espionage Campaigns

July 12, 2019

Severity

High

Analysis Summary


The Buhtrap group is well known for its targeting of financial institutions and businesses in Russia. However, since late 2015, an interesting change in its traditional targets. From a pure criminal group perpetrating cybercrime for financial gain, its toolset has been expanded with malware used to conduct espionage in Eastern Europe and Central Asia.

Throughout the tracking, this group deploy its main backdoor as well as other tools against various victims, but June 2019 was the first time the Buhtrap group use a zero-day exploit as part of a campaign. In that case, we observed Buhtrap using a local privilege escalation exploit, CVE-2019-1132, against one of its victims. The exploit abuses a local privilege escalation vulnerability in Microsoft Windows, specifically a NULL pointer dereference in the win32k.sys component. Once the exploit was discovered and analyzed, it was reported to the Microsoft Security Response Center, who promptly fixed the vulnerability and released a patch.

New tools have been added to their arsenal and updates applied to older ones, the tactics, techniques and procedures (TTPs) used in the different Buhtrap campaigns have not changed dramatically over all these years. They still make extensive use of NSIS installers as droppers and these are mainly delivered through malicious documents. Also, several of their tools are signed with valid code-signing certificates and abuse a known, legitimate application to side-load their malicious payloads.

Impact

Privilege escalation

Indicators of Compromise

URLs

  • 7812[.]reg0.5204[.]toor[.]win10[.]ipv6-microsoft[.]org
  • 7812[.]reg0[.]5267[.]toor[.]win10[.]ipv6-microsoft[.]org
  • 7812[.]reg0.5314[.]toor.win10[.]ipv6-microsoft[.]org
  • 7812[.]reg0.5361[.]toor[.]win10.ipv6-microsoft[.]org
  • 7812[.]reg0[.]4621.toor[.]win10.ipv6-microsoft[.]org
  • 7812[.]reg0[.]5173[.]toor.win10[.]ipv6-microsoft[.]org
  • corp-microsoft[.]co

Malware Hash (MD5/SHA1/SH256)

  • 2f2640720cce2f83ca2f0633330f13651384dd6a
  • 6e820b5732cd8bb95546cf39aeb6babe90cf4cc7dde675b718710babcf1740b5
  • b475f14a1ffdeaf883c73e97724544b9bba0f6c481830bd25e3ba0d0f69b9181
  • c17c335b7ddb5c8979444ec36ab668ae8e4e0a72
  • e0f3557ea9f2ba4f7074caa0d0cf3b187c4472ff
  • fd6c772c31da19a66283af4703d1d5072a9158d03031a4094ac2eb8dccd3d6d1

Remediation

Search for the existing IOC’s in your environment.
Patch for the exploited vulnerability.

https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2019-1132

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