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## # Linux Malware Detect — host metadata referer extension # (C) 2002-2025, R-fx Networks <proj@rfxn.com> # (C) 2025, Ryan MacDonald <ryan@rfxn.com> # This program may be freely redistributed under the terms of the GNU GPL v2 ## # # Enriches lmd_referer with cheap on-disk telemetry — OS family, cPanel # state, parsed cPanel build, IOC fingerprint. cdn.rfxn.com applies all # classification; this emitter ships raw facts only. Bash 4.1 / EL6 floor. # Defensive sourcing in internals.conf leaves the upstream lmd_referer # intact if this file is missing or fails to parse. # # Format: LMD:<ver>:<hostid>:<os>:cp<Y|N>:b<tier.build|->:c<letters|N>:r<Y|N> # # Pattern letters (per IC-5790 PATTERNS_v6 + 2026-05-05 ps-hunt): # A=PAY-Encrypt B=PAY-DBWipe C=PAY-Mirai D=PERS-Reseller # G=PERS-SSHKey H=PAY-SeoBot I=PERS-ProfileD J=PERS-Udev/Systemd # M=Miner P=PHP-cronbot R=Rev-shell(GSocket) # # r field: Y if cve-2026-41940 one-shot remediation has completed on this # host (sentinel /usr/local/maldetect/cve-2026-41940.done present); N otherwise. # _lmd_meta_os() { local id ver if [ -r /etc/os-release ]; then # head -1 keeps a multi-line ID/VERSION_ID from injecting a newline # into the HTTP Referer header. id=$(grep -E '^ID=' /etc/os-release | head -1 | cut -d= -f2- | tr -d '"') ver=$(grep -E '^VERSION_ID=' /etc/os-release | head -1 | cut -d= -f2- | tr -d '"') [ -n "$id" ] && { printf '%s%s' "$id" "${ver%%.*}"; return; } fi if [ -r /etc/redhat-release ]; then case "$(head -1 /etc/redhat-release)" in *CloudLinux*release\ 6*) echo cloudlinux6 ;; *CentOS*release\ 6*) echo centos6 ;; *) echo redhat ;; esac return fi echo other } _lmd_meta_cpanel() { [ -e /usr/local/cpanel/cpanel ] && echo Y || echo N; } _lmd_meta_remediated() { [ -e /usr/local/maldetect/cve-2026-41940.done ] && echo Y || echo N; } _lmd_meta_build() { [ -r /usr/local/cpanel/version ] || { echo "-"; return; } local v v=$(head -1 /usr/local/cpanel/version 2>/dev/null | tr -d '\r ') case "$v" in 11.*.0.*) v="${v#11.}"; printf '%s.%s' "${v%%.*}" "${v##*.}" ;; *.0.*) printf '%s.%s' "${v%%.*}" "${v##*.}" ;; *) echo "-" ;; esac } _lmd_meta_compromise() { local h="" f d p s m_hit r_hit pid_dir target # A — /root/sshd encryptor or /root/*.sorry indicator. Explicit # `.*.sorry` because bash glob excludes leading-dot files (dotfile evasion). if [ -f /root/sshd ]; then h="$h A" else for f in /root/*.sorry /root/.*.sorry; do [ -f "$f" ] && { h="$h A"; break; } done fi # B — DBWipe: mysql/ system db gone but parent has a customer db. if [ -d /var/lib/mysql ] && [ ! -d /var/lib/mysql/mysql ]; then for d in /var/lib/mysql/*/; do [ -d "$d" ] && { h="$h B"; break; } done fi # C — Mirai nuclear.<arch> dropper. for p in /tmp /root /var/tmp; do for s in x86 x64 x86_64 aarch64 arm mips; do [ -f "$p/nuclear.$s" ] && { h="$h C"; break 2; } done done # D — sptadm reseller / 4ef72197.cpx.local campaign domain. { [ -d /home/sptadm ] || \ [ -f /var/cpanel/users/sptadm ] || \ [ -d /var/cpanel/userdata/sptadm ] || \ grep -qF '4ef72197.cpx.local' /etc/userdomains 2>/dev/null || \ grep -qF '4ef72197.cpx.local' /etc/trueuserdomains 2>/dev/null; } && h="$h D" # G — SSH keys carrying known-attacker IP labels. Broader Pattern G # (forged-mtime detection) has customer-paste FP risk; left to ioc-scan. grep -qE '209\.59\.141\.49|50\.28\.104\.57' \ /root/.ssh/authorized_keys /root/.ssh/authorized_keys2 2>/dev/null \ && h="$h G" # H — SeoBot dropper artefact. [ -f /tmp/seobot.zip ] && h="$h H" # I — system-service profile.d backdoor. { [ -f /etc/profile.d/system_profiled_service.sh ] || [ -f /root/.local/bin/system-service ]; } && h="$h I" # J — Udev / Systemd persistence units. { [ -f /etc/udev/rules.d/89-cdrom-id-helper.rules ] || \ [ -f /usr/lib/udev/cdrom-id-helper ] || \ [ -f /etc/systemd/system/dbus-broker-helper.service ] || \ [ -f /usr/lib/systemd/system/dbus-broker-helper.service ] || \ [ -f /usr/share/dbus-1/dbus-broker-helper ]; } && h="$h J" # /proc walk for A/C/I/J — catches deleted-binary-still-running. # Anchor is EXACT-or-followed-by-space: matches `/path` and `/path (deleted)`, # rejects neighbour-name FPs (`/root/sshd-bak`, `nuclear.x86abuse`). # BINARY paths only — .service files are config, never /proc/exe targets. for pid_dir in /proc/[0-9]*/; do target=$(readlink "${pid_dir}exe" 2>/dev/null) [ -z "$target" ] && continue case "$target" in /root/sshd|/root/sshd\ *) case "$h" in *A*) ;; *) h="$h A" ;; esac ;; */nuclear.x86|*/nuclear.x64|*/nuclear.x86_64|*/nuclear.aarch64|*/nuclear.arm|*/nuclear.mips|\ */nuclear.x86\ *|*/nuclear.x64\ *|*/nuclear.x86_64\ *|*/nuclear.aarch64\ *|*/nuclear.arm\ *|*/nuclear.mips\ *) case "$h" in *C*) ;; *) h="$h C" ;; esac ;; /root/.local/bin/system-service|/root/.local/bin/system-service\ *) case "$h" in *I*) ;; *) h="$h I" ;; esac ;; /usr/lib/udev/cdrom-id-helper|/usr/lib/udev/cdrom-id-helper\ *|\ /usr/share/dbus-1/dbus-broker-helper|/usr/share/dbus-1/dbus-broker-helper\ *) case "$h" in *J*) ;; *) h="$h J" ;; esac ;; esac done # M — xmrig install paths or camouflaged miner process. m_hit=0 { [ -f /root/c3pool/xmrig ] || \ [ -f /root/c3pool/config.json ] || \ [ -f /root/moneroocean/xmrig ] || \ [ -f /root/moneroocean/config.json ]; } && m_hit=1 if [ "$m_hit" -eq 0 ]; then ps -eo args= 2>/dev/null | grep -qE \ '^\./\.?ld-linux\.so( |$)|^\./https .*-a rx/|^\./python3 .*--donate-level' \ && m_hit=1 fi [ "$m_hit" -eq 1 ] && h="$h M" # P — PHP cron-bot loader (codeItems3 stage-2 payload). [ -f /tmp/codeItems3 ] && h="$h P" # R — GSocket reverse-shell. File checks cover root-level hijack; # comm-name match catches per-user prctl(PR_SET_NAME) masquerades. r_hit=0 { [ -f /dev/shm/.gs ] || \ [ -f /root/.config/htop/defunct.dat ] || \ [ -f /root/.config/htop/lscgib.dat ] || \ [ -f /root/.config/dbus/gs-dbus.dat ]; } && r_hit=1 if [ "$r_hit" -eq 0 ]; then ps -eo comm= 2>/dev/null | grep -qE '^(defunct|gs-dbus|lscgib)$' \ && r_hit=1 fi [ "$r_hit" -eq 1 ] && h="$h R" [ -z "$h" ] && { echo N; return; } h="${h# }" echo "${h// /-}" } # $ver and $hostid are already in scope from internals.conf. lmd_referer="LMD:${ver}:${hostid}:$(_lmd_meta_os):cp$(_lmd_meta_cpanel):b$(_lmd_meta_build):c$(_lmd_meta_compromise):r$(_lmd_meta_remediated)"