Coinminer.Linux.SKIDMAP.WGL

This Coinminer arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Coinminer arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Coinminer drops the following files:

• /lib64/security/pam_unix.so -> if 64-bit, compromised pam_unix.so file
• /lib/x86_64-linux-gnu/security/pam_unix.so -> if 32-bit, compromised pam_unix.so file

It adds the following processes:

• ./pamdicks.org

Other Details

This Coinminer does the following:

• It checks for the presence of the following files:
  /lib64/security/pam_unix.so
  /lib/x86_64-linux-gnu/security/pam_unix.so.
  If present, it will replace it with a malicious copy of "pam_unix.so", otherwise it will create its own "pam_unix.so"
• It checks if setenforce is running; if found running, it will execute the following command:
  execute (setenforce 0)
• It sets the following configurations if /etc/selinux/config is present:
  SELINUX=disabled
  SELINUXTYPE=targeted, to disabled setenforce
• It checks for the first process id -100 in /var/run/bioset is running.
  If the process id is not running the malware will create an additional process of itself.
• It connects to the following mining pools:
  • pool.cpuminerpool.com:443
  • pool.minexmr.com:80
  • pool.minexmr.com:5555
  • xmr.pool
  • aeon.pool

It accepts the following parameters:

• -a, --algo=ALGO specifies the algorithm to use cryptonight cryptonight-lite cryptonight-heavy
• -o, --url=URL URL of mining server
• -O, --userpass=U:P username:password pair for mining server
• -u, --user=USERNAME username for mining server
• -p, --pass=PASSWORD password for mining server
• --rig-id=ID rig identifier for pool-side statistics (needs pool support)
• -t, --threads=N number of miner threads
• -v, --av=N algorithm variation, 0 auto select
• -k, --keepalive sends keepalived packet for prevent timeout (needs pool support)
• --nicehash enables nicehash.com support
• --tls enables SSL/TLS support (needs pool support)
• --tls-fingerprint=F pool TLS certificate fingerprint, if set, enables strict certificate pinning
• -r, --retries=N number of times of retrying before switching to backup server (default: 5)
• -R, --retry-pause=N time to pause between retries (default: 5)
• --cpu-affinity set process affinity to CPU core(s), mask 0x3 for cores 0 and 1
• --cpu-priority sets process priority (0 idle, 2 normal to 5 highest)
• --no-huge-pages disables huge pages support
• --no-color disables colored output
• --variant algorithm PoW variant
• --donate-level=N donate level, default 5% (5 minutes in 100 minutes)
• --user-agent sets custom user-agent string for pool
• -B, --background runs the miner in the background
• -c, --config=FILE loads a JSON-format configuration file
• -l, --log-file=FILE logs all output to a file
• -S, --syslog uses system log for output messages
• --max-cpu-usage=N maximum CPU usage for automatic threads mode (default 75)
• --safe safe adjust threads and av settings for current CPU
• --asm=ASM ASM code for cn/2, possible values: auto, none, intel, ryzen.
• --print-time=N prints hashrate report every N seconds
• --api-port=N port for the miner API
• --api-access-token=T access token for API
• --api-worker-id=ID custom worker-id for API
• --api-id=ID custom instance ID for API
• --api-ipv6 enables IPv6 support for API
• --api-no-restricted enables full remote access (only if API token set)
• --dry-run test configuration and exit
• -h, --help display this help and exit
• -V, --version output version information and exit

It executes the following command to disable/stop/delete Windows components:

• -B -> background
• -o -> url
• -u -> username
• -p -> password
• -h/--help -> help
• -V/--version -> version