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1. Ccleaner for windows xp service pack 2 software#
2. Ccleaner for windows xp service pack 2 Pc#
3. Ccleaner for windows xp service pack 2 download#

The output determines the location of the dropped binary. The dropper also performs system checks by accessing the USER_SHARED_DATA of its own process and querying the NtMajorVersion value to determine if the system is running Windows XP. The dropper will zlib inflate itself and drop onto the victim computer. The binary is embedded within the malware itself, and it is zlib compressed. Depending on the result, it will drop a 32-bit or 64-bit binary on the system. Once executed, the dropper calls IsWow64Process to determine if it’s being run in a 64-bit environment.

The following information describes the Stage 2 dropper that pertains to the CCleaner embedded malware:

Ccleaner for windows xp service pack 2 download#

This post provides an in-depth analysis of the Stage 2 dropper the subsequent payload and the steps that are taken to calculate the C2 IP address in order to download the next stage binary. This payload attains the C2 address via a variety of steps, and downloads an unknown binary which is Stage 3. Stage 2 drops either a 32-bit or 64-bit binary, depending on the system architecture and is responsible for decrypting the actual payload embedded in a registry key.

In addition, CrowdStrike Falcon® Intelligence™ reported on the backdoor previously and discussed the possibility of the infrastructure being tied to a Chinese nexus.Īdditionally, CrowdStrike Falcon Intelligence also discussed the technical details of the Stage 1 and Stage 2 backdoors with analysis showing that the original backdoor was the first stage in a multi-stage infection chain, meant to download a dropper (Stage 2) that was only deployed to specific targets.

Ccleaner for windows xp service pack 2 software#

This was an example of using an organization’s supply chain infrastructure as an infection vector, a trend that has been on the rise in 2017 as discussed in another recent post, Software Supply Chain Attacks on the Rise, Undermining Customer Trust.

Ccleaner for windows xp service pack 2 Pc#

Recently, CrowdStrike® analyzed the backdoor embedded in the legitimate PC cleaning utility CCleaner version 5.33, as reported in the blog post Protecting the Software Supply Chain: Deep Insights into the CCleaner Backdoor.