this post was submitted on 14 Aug 2023
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Text version:
Downloaded a virus for Linux lately and unpacked it. Tried to run it as root, didn't work. Googled for 2 hours, found out that instead of
/usr/local/bin
the virus unpacked to/usr/bin
for which the user malware doesn't have any write permissions, therefore the virus couldn't create a process file. Found patched .configure and .make files on some Chinese forum, recompiled and rerun it. The virus said it needs the librarycmalw-lib-2.0
.Turns outcmalw-lib-2.0
is shipped with CentOS but not with Ubuntu. Googled for hours again and found an instruction to build a.deb package from source. The virus finally started, wrote some logs, made a core dump and crashed. After 1 hour of going through the logs I discovered the virus assumed it was running on ext4 and called into its disk encryption API. Under btrfs this API is deprecated. The kernel noticed and made this partition read-onlyOpened the sources, grep'ed the Bitcoin wallet and sent $5 out of pity.