Skip to main content

遭遇黑客软件

昨晚突然发现电脑变慢,ps一看有好多以www用户名的进程,我可没有这个用户啊,再看那些进程,一堆scan和一个httpd等,真是可疑。

然后去/proc/查看,那些文件的可执行文件都位于/tmp/.a,里面除了这个scanner和httpd外,还有bruteforce和一个弱密码字典,以及一些扫描的log。 哇,中招了!

于是赶紧杀进程,然后想删掉这些文件,却总是报Segmentation fault, 之后又试了几个命令,也是报这个错,我看了一下/bin, 啊,原来很多命令的文件都被修改了。 于是重启,发现启动过程中都是Segmentation fault, 一下子懵住了。 当时太困了,不知所措,只好关掉等今天解决。

实在是不想重装,于是试图恢复,首先用live cd启动,把/bin的那些文件拷过去一份,然后搜了下/sbin,/usr/bin等重要文件夹,没有被改动的样子(这里/bin,/sbin,/usr/bin都是硬盘上的而不是live cd上的), 之后,用chroot和aptitude重装了一下coreutils,为了保险,把一些*utils都重装了一下。

然后重启,似乎是正常了,松了一口气。但是还是要观望一段时间,看有没有什么遗留的。

现在想一下,根据那个文件夹里的log和字典文件推断,那个scanner是破解ssh里高权限用户的密码,然后一看我这里的root密码,天啊,原来是个弱密码,我才想起来当时装MySQL时图省事弄的,结果现在忘了。。真是敲响了警钟。

另外上网搜了一下相关资料,除了看到一个人跟我有类似情况外,没有别的有用的信息,看来这个东西还是挺新的。

现在赶紧把ssh的root登录关掉。

总之是第一次有这种经历,万幸阿,那个程序没给我rm -rf /, 我作业还没写完呢。。

Comments

Popular posts from this blog

Determine Perspective Lines With Off-page Vanishing Point

In perspective drawing, a vanishing point represents a group of parallel lines, in other words, a direction. For any point on the paper, if we want a line towards the same direction (in the 3d space), we simply draw a line through it and the vanishing point. But sometimes the vanishing point is too far away, such that it is outside the paper/canvas. In this example, we have a point P and two perspective lines L1 and L2. The vanishing point VP is naturally the intersection of L1 and L2. The task is to draw a line through P and VP, without having VP on the paper. I am aware of a few traditional solutions: 1. Use extra pieces of paper such that we can extend L1 and L2 until we see VP. 2. Draw everything in a smaller scale, such that we can see both P and VP on the paper. Draw the line and scale everything back. 3. Draw a perspective grid using the Brewer Method. #1 and #2 might be quite practical. #3 may not guarantee a solution, unless we can measure distances/p...

Hardware Password Manager

[Updates 2025-01-20] The original blog post assumes that all passwords are stored in one password manager, and the password manager either unlocks everything or nothing (e.g. Keepass). After discussing with friends, I realized that if I use something like pass , and I use a hardware GPG token, I can actually store and sync all encrypted passwords to all devices, because I will only decrypt the passwords on demand, and the computer will not see the GPG private key. The compromise is that the computer will see the list of all password entries (e.g. accounts), as well as a few other issues . I've been using Keepass for many years. I don't use online password services because I cannot fully trust them. Besides, I may not always have Internet connection, which is why I also don't use a self-hosted service. Everything has been working fine, until I turn my paranoid knob to the max. Here's the thought experiment . The Imaginary Scenario Let's say I have 100 PCs for differe...

Installing Linux on Surface Pro 1g

Windows 10 will soon reach its end of life, and my 1-gen Surface Pro is not supported by Windows 11. I (finally) decided to install Linux to it. Fortunately, it's a not-so-easy nice adventure: The device has only one USB port, so I have to bring back my 10+-year old USB hub. My live USB drive cannot boot directly, I have to disable Secure Boot first, by holding Volume Up during boot. I think years ago I learned that booting on USB might not work through a USB hub, but fortunatelly it worked well with my setup. This is done by holding Volume Down during boot. Wifi adapter was detected in the live Linux environment, but not functional. And I don't have a USB-Ethernet adapter. Luckily, nowadays we have USB-tethering from Android phones, which works out-of-the-box. Originally I planned to following this guide to set up root on ZFS, however, the system froze when building the ZFS kernel module. Then I decided to just use EXT4, yet I still learned a lot from the guide about disk par...