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ELF_SETAG.SM

July 23, 2019
 Analysis by: John Kevin Sanchez
 Modified by: Marvelous Pelin
 ALIASES:

Backdoor:Linux/Setag.A(Microsoft)

 PLATFORM:

Linux

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Via vulnerability(ies), Downloaded from the Internet, Dropped by other malware

This malware is part of an attack chain that involves searching for exposed or publicly accessible Elasticsearch databases/servers. The malware would invoke a shell with an attacker-crafted search query with encoded Java commands.

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

  TECHNICAL DETAILS

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

09 Mar 2017

Payload:

Compromises system security, Connects to URLs/IPs, Steals information

Arrival Details

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

This malware arrives via the following means:

Installation

This Backdoor drops the following files:

  • /tmp/notify.file
  • /usr/bin/pythno
  • /usr/bin/bsd-port/knerl.conf
  • /usr/bin/bsd-port/udevd.conf
  • /usr/lib/libamplify.so - list of IP addresses used for its DDoS capabilities

It creates the following folders:

  • /usr/bin/dpkgd/

Information Theft

This Backdoor gathers the following data:

  • CPU frequency
  • CPU usage
  • Gate MAC address
  • Host's IP address
  • Infomation about network interfaces
  • Number of CPU cores
  • OS name
  • OS version
  • RAM

Other Details

This Backdoor does the following:

  • This malware replaces the following files with copies of itself and backs up the original files into /usr/bin/dpkg/:
    • /bin/netstat
    • /bin/lsof
    • /bin/ps
    • /usr/bin/netstat
    • /usr/bin/lsof
    • /usr/bin/ps
    • /usr/sbin/netstat
    • /usr/sbin/lsof
    • /usr/sbin/ps
  • It is capable of performing DDoS attacks

NOTES:

This backdoor connects to the following website to send and receive information:

  • {BLOCKED}.{BLOCKED}.189.10
  • {BLOCKED}.{BLOCKED}.189.18
  • {BLOCKED}.{BLOCKED}.100.100
  • {BLOCKED}.{BLOCKED}0.55
  • {BLOCKED}.{BLOCKED}.211.22
  • {BLOCKED}.{BLOCKED}.114.114
  • {BLOCKED}.{BLOCKED}.115.115
  • {BLOCKED}.{BLOCKED}.111.118
  • {BLOCKED}.{BLOCKED}.249.50
  • {BLOCKED}.{BLOCKED}.249.54
  • {BLOCKED}.{BLOCKED}.255.228
  • {BLOCKED}.{BLOCKED}.6.6
  • {BLOCKED}.{BLOCKED}.33.240
  • {BLOCKED}.{BLOCKED}.97.234
  • {BLOCKED}.{BLOCKED}.97.238
  • {BLOCKED}.{BLOCKED}.97.242
  • {BLOCKED}.{BLOCKED}.160.110
  • {BLOCKED}.{BLOCKED}.10.20
  • {BLOCKED}.{BLOCKED}.150.20
  • {BLOCKED}.{BLOCKED}.252.16
  • {BLOCKED}.{BLOCKED}.55.244
  • {BLOCKED}.{BLOCKED}.1.1
  • {BLOCKED}.{BLOCKED}.192.1
  • {BLOCKED}.{BLOCKED}.192.174
  • {BLOCKED}.{BLOCKED}.255.18
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.199.8
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.107.85
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.226.68
  • {BLOCKED}.{BLOCKED}.6.2
  • {BLOCKED}.{BLOCKED}.98.55
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.134.68
  • {BLOCKED}.{BLOCKED}.152.3
  • {BLOCKED}.{BLOCKED}.154.3
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.199.68
  • {BLOCKED}.{BLOCKED}.200.101
  • {BLOCKED}.{BLOCKED}.213.68
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.227.68
  • {BLOCKED}.{BLOCKED}.24.34
  • {BLOCKED}.{BLOCKED}.3.141
  • {BLOCKED}.{BLOCKED}.3.144
  • {BLOCKED}.{BLOCKED}.7.90
  • {BLOCKED}.{BLOCKED}.8.141
  • {BLOCKED}.{BLOCKED}.9.141
  • {BLOCKED}.{BLOCKED}.0.117
  • {BLOCKED}.{BLOCKED}.0.68
  • {BLOCKED}.{BLOCKED}.176.22
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.225.68
  • {BLOCKED}.{BLOCKED}.24.68
  • {BLOCKED}.{BLOCKED}.243.112
  • {BLOCKED}.{BLOCKED}.44.150
  • {BLOCKED}.{BLOCKED}.96.112
  • {BLOCKED}.{BLOCKED}.0.20
  • {BLOCKED}.{BLOCKED}.195.68
  • {BLOCKED}.{BLOCKED}.196.115
  • {BLOCKED}.{BLOCKED}.196.212
  • {BLOCKED}.{BLOCKED}.196.228
  • {BLOCKED}.{BLOCKED}.196.230
  • {BLOCKED}.{BLOCKED}.196.232
  • {BLOCKED}.{BLOCKED}.196.237
  • {BLOCKED}.{BLOCKED}.46.151
  • {BLOCKED}.{BLOCKED}.112.10
  • {BLOCKED}.{BLOCKED}.144.30
  • {BLOCKED}.{BLOCKED}.16.10
  • {BLOCKED}.{BLOCKED}.16.11
  • {BLOCKED}.{BLOCKED}.0.242
  • {BLOCKED}.{BLOCKED}.240.6
  • {BLOCKED}.{BLOCKED}.32.36
  • {BLOCKED}.{BLOCKED}.32.39
  • {BLOCKED}.{BLOCKED}.96.10
  • {BLOCKED}.{BLOCKED}.96.5
  • {BLOCKED}.{BLOCKED}.1.29
  • {BLOCKED}.{BLOCKED}.1.53
  • {BLOCKED}.{BLOCKED}.67.14
  • {BLOCKED}.{BLOCKED}.67.4
  • {BLOCKED}.{BLOCKED}.3.3
  • {BLOCKED}.{BLOCKED}.3.8
  • {BLOCKED}.{BLOCKED}.64.33
  • {BLOCKED}.{BLOCKED}.64.1
  • {BLOCKED}.{BLOCKED}.128.33
  • {BLOCKED}.{BLOCKED}.144.33
  • {BLOCKED}.{BLOCKED}.160.33
  • {BLOCKED}.{BLOCKED}.192.33
  • {BLOCKED}.{BLOCKED}.208.33
  • {BLOCKED}.{BLOCKED}.224.33
  • {BLOCKED}.{BLOCKED}.64.1
  • {BLOCKED}.{BLOCKED}.84.58
  • {BLOCKED}.{BLOCKED}.84.67
  • {BLOCKED}.{BLOCKED}.252.8
  • {BLOCKED}.{BLOCKED}.128.32
  • {BLOCKED}.{BLOCKED}.103.36
  • {BLOCKED}.{BLOCKED}.104.15
  • {BLOCKED}.{BLOCKED}.104.26
  • {BLOCKED}.{BLOCKED}.107.27
  • {BLOCKED}.{BLOCKED}.128.166
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.128.86
  • {BLOCKED}.{BLOCKED}.134.133
  • {BLOCKED}.{BLOCKED}.134.33
  • {BLOCKED}.{BLOCKED}.144.47
  • {BLOCKED}.{BLOCKED}.154.15
  • {BLOCKED}.{BLOCKED}.209.133
  • {BLOCKED}.{BLOCKED}.209.5
  • {BLOCKED}.{BLOCKED}.64.68
  • {BLOCKED}.{BLOCKED}.69.38
  • {BLOCKED}.{BLOCKED}.75.68
  • {BLOCKED}.{BLOCKED}.86.18
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.7.17
  • {BLOCKED}.{BLOCKED}.7.6
  • {BLOCKED}.{BLOCKED}.0.68
  • {BLOCKED}.{BLOCKED}.192.67
  • {BLOCKED}.{BLOCKED}.198.167
  • {BLOCKED}.{BLOCKED}.224.68
  • {BLOCKED}.{BLOCKED}.5.68
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.104.68
  • {BLOCKED}.{BLOCKED}.160.68
  • {BLOCKED}.{BLOCKED}.166.4
  • {BLOCKED}.{BLOCKED}.168.8
  • {BLOCKED}.{BLOCKED}.192.66
  • {BLOCKED}.{BLOCKED}.192.68
  • {BLOCKED}.{BLOCKED}.224.67
  • {BLOCKED}.{BLOCKED}.224.8
  • {BLOCKED}.{BLOCKED}.96.68
  • {BLOCKED}.{BLOCKED}.100.18
  • {BLOCKED}.{BLOCKED}.100.21
  • {BLOCKED}.{BLOCKED}.94.20
  • {BLOCKED}.{BLOCKED}.94.241
  • {BLOCKED}.{BLOCKED}.96.9
  • {BLOCKED}.{BLOCKED}.211.193
  • {BLOCKED}.{BLOCKED}.211.225
  • {BLOCKED}.{BLOCKED}.196.6
  • {BLOCKED}.{BLOCKED}.3.140
  • {BLOCKED}.{BLOCKED}.4.130
  • {BLOCKED}.{BLOCKED}.192.33
  • {BLOCKED}.{BLOCKED}.241.1
  • {BLOCKED}.{BLOCKED}.13.101
  • {BLOCKED}.{BLOCKED}.112.50
  • {BLOCKED}.{BLOCKED}.150.66
  • {BLOCKED}.{BLOCKED}.17.107
  • {BLOCKED}.{BLOCKED}.28.231
  • {BLOCKED}.{BLOCKED}.28.234
  • {BLOCKED}.{BLOCKED}.28.237
  • {BLOCKED}.{BLOCKED}.160.185
  • {BLOCKED}.{BLOCKED}.160.5
  • {BLOCKED}.{BLOCKED}.241.34
  • {BLOCKED}.{BLOCKED}.32.178
  • {BLOCKED}.{BLOCKED}.106.19
  • {BLOCKED}.{BLOCKED}.145.194
  • {BLOCKED}.{BLOCKED}.151.161
  • {BLOCKED}.{BLOCKED}.156.66
  • {BLOCKED}.{BLOCKED}.164.6
  • {BLOCKED}.{BLOCKED}.180.2
  • {BLOCKED}.{BLOCKED}.200.69
  • {BLOCKED}.{BLOCKED}.240.100
  • {BLOCKED}.{BLOCKED}.242.18
  • {BLOCKED}.{BLOCKED}.245.180
  • {BLOCKED}.{BLOCKED}.75.123
  • {BLOCKED}.{BLOCKED}.91.1
  • {BLOCKED}.{BLOCKED}.1.3
  • {BLOCKED}.{BLOCKED}.2.18
  • {BLOCKED}.{BLOCKED}.29.150
  • {BLOCKED}.{BLOCKED}.29.170
  • {BLOCKED}.{BLOCKED}.29.68
  • {BLOCKED}.{BLOCKED}.73.34
  • {BLOCKED}.{BLOCKED}.197.58
  • {BLOCKED}.{BLOCKED}.16.99
  • {BLOCKED}.{BLOCKED}.90.68
  • {BLOCKED}.{BLOCKED}.210.100
  • {BLOCKED}.{BLOCKED}.210.98
  • {BLOCKED}.{BLOCKED}.6.3
  • {BLOCKED}.{BLOCKED}.158.11
  • {BLOCKED}.{BLOCKED}.159.3
  • {BLOCKED}.{BLOCKED}.61.225
  • {BLOCKED}.{BLOCKED}.61.235
  • {BLOCKED}.{BLOCKED}.61.255
  • {BLOCKED}.{BLOCKED}.62.1
  • {BLOCKED}.{BLOCKED}.62.60
  • {BLOCKED}.{BLOCKED}.130.1
  • {BLOCKED}.{BLOCKED}.72.65
  • {BLOCKED}.{BLOCKED}.80.65
  • {BLOCKED}.{BLOCKED}.88.129
  • {BLOCKED}.{BLOCKED}.136.81
  • {BLOCKED}.{BLOCKED}.144.161
  • {BLOCKED}.{BLOCKED}.0.81
  • {BLOCKED}.{BLOCKED}.24.129
  • {BLOCKED}.{BLOCKED}.64.129
  • {BLOCKED}.{BLOCKED}.1.97
  • {BLOCKED}.{BLOCKED}.193.97
  • {BLOCKED}.{BLOCKED}.72.1
  • {BLOCKED}.{BLOCKED}.64.129
  • {BLOCKED}.{BLOCKED}.96.65
  • {BLOCKED}.{BLOCKED}.121.27
  • {BLOCKED}.{BLOCKED}.2.4
  • {BLOCKED}.{BLOCKED}.4.1
  • {BLOCKED}.{BLOCKED}.72.7
  • {BLOCKED}.{BLOCKED}.111.114
  • {BLOCKED}.{BLOCKED}.111.122
  • {BLOCKED}.{BLOCKED}.128.106
  • {BLOCKED}.{BLOCKED}.32.106
  • {BLOCKED}.{BLOCKED}.78.2
  • {BLOCKED}.{BLOCKED}.127.114
  • {BLOCKED}.{BLOCKED}.127.122
  • {BLOCKED}.{BLOCKED}.248.219
  • {BLOCKED}.{BLOCKED}.248.245
  • {BLOCKED}.{BLOCKED}.135.1
  • {BLOCKED}.{BLOCKED}.17.2
  • {BLOCKED}.{BLOCKED}.152.130
  • {BLOCKED}.{BLOCKED}.101.3
  • {BLOCKED}.{BLOCKED}.160.194
  • {BLOCKED}.{BLOCKED}.19.40
  • {BLOCKED}.{BLOCKED}.19.50
  • {BLOCKED}.{BLOCKED}.200.139
  • {BLOCKED}.{BLOCKED}.192.100
  • {BLOCKED}.{BLOCKED}.152.99
  • {BLOCKED}.{BLOCKED}.157.99
  • {BLOCKED}.{BLOCKED}.0.124
  • {BLOCKED}.{BLOCKED}.136.10
  • {BLOCKED}.{BLOCKED}.140.10
  • {BLOCKED}.{BLOCKED}.148.37
  • {BLOCKED}.{BLOCKED}.148.39
  • {BLOCKED}.{BLOCKED}.1.66
  • {BLOCKED}.{BLOCKED}.1.66
  • {BLOCKED}.{BLOCKED}.198.230
  • {BLOCKED}.{BLOCKED}.204.66
  • {BLOCKED}.{BLOCKED}.194.55
  • {BLOCKED}.{BLOCKED}.6.99
  • {BLOCKED}.{BLOCKED}.32.132
  • {BLOCKED}.{BLOCKED}.127.1
  • {BLOCKED}.{BLOCKED}.26.42
  • {BLOCKED}.{BLOCKED}.225.253
  • {BLOCKED}.{BLOCKED}.208.3
  • {BLOCKED}.{BLOCKED}.208.6
  • {BLOCKED}.{BLOCKED}.64.68
  • {BLOCKED}.{BLOCKED}.132.2
  • {BLOCKED}.{BLOCKED}.1.227
  • {BLOCKED}.{BLOCKED}.33.227
  • {BLOCKED}.{BLOCKED}.252.200
  • {BLOCKED}.{BLOCKED}.32.100
  • {BLOCKED}.{BLOCKED}.32.103
  • {BLOCKED}.{BLOCKED}.32.106
  • {BLOCKED}.{BLOCKED}.32.109
  • {BLOCKED}.{BLOCKED}.33.52
  • {BLOCKED}.{BLOCKED}.33.60
  • {BLOCKED}.{BLOCKED}.143.69
  • {BLOCKED}.{BLOCKED}.3.70
  • {BLOCKED}.{BLOCKED}.3.73
  • {BLOCKED}.{BLOCKED}.3.76
  • {BLOCKED}.{BLOCKED}.3.79
  • {BLOCKED}.{BLOCKED}.3.83
  • {BLOCKED}.{BLOCKED}.3.85
  • {BLOCKED}.{BLOCKED}.4.12
  • {BLOCKED}.{BLOCKED}.4.15
  • {BLOCKED}.{BLOCKED}.4.18
  • {BLOCKED}.{BLOCKED}.4.21
  • {BLOCKED}.{BLOCKED}.4.6
  • {BLOCKED}.{BLOCKED}.4.9
  • {BLOCKED}.{BLOCKED}.255.1
  • {BLOCKED}.{BLOCKED}.129.30
  • {BLOCKED}.{BLOCKED}.131.11
  • {BLOCKED}.{BLOCKED}.66.66
  • {BLOCKED}.{BLOCKED}.203.86
  • {BLOCKED}.{BLOCKED}.203.90
  • {BLOCKED}.{BLOCKED}.203.98
  • {BLOCKED}.{BLOCKED}.88.88
  • {BLOCKED}.{BLOCKED}.4.66
  • {BLOCKED}.{BLOCKED}.1.20
  • {BLOCKED}.{BLOCKED}.128.68
  • {BLOCKED}.{BLOCKED}.136.68
  • {BLOCKED}.{BLOCKED}.34.10
  • {BLOCKED}.{BLOCKED}.92.86
  • {BLOCKED}.{BLOCKED}.92.98
  • {BLOCKED}.{BLOCKED}.200.68
  • {BLOCKED}.{BLOCKED}.5.240
  • {BLOCKED}.{BLOCKED}.222.222
  • {BLOCKED}.{BLOCKED}.129.81
  • {BLOCKED}.{BLOCKED}.129.80
  • {BLOCKED}.{BLOCKED}.0.110
  • {BLOCKED}.{BLOCKED}.1.40
  • {BLOCKED}.{BLOCKED}.120.5
  • {BLOCKED}.{BLOCKED}.29.93
  • {BLOCKED}.{BLOCKED}.62.142
  • {BLOCKED}.{BLOCKED}.118.162
  • {BLOCKED}.{BLOCKED}.152.129
  • {BLOCKED}.{BLOCKED}.85.85
  • {BLOCKED}.{BLOCKED}.88.88
  • {BLOCKED}.{BLOCKED}.96.66
  • {BLOCKED}.{BLOCKED}.57.33
  • {BLOCKED}.{BLOCKED}.208.46
  • {BLOCKED}.{BLOCKED}.2.2
  • {BLOCKED}.{BLOCKED}.78.210
  • {BLOCKED}.{BLOCKED}.244.5
  • {BLOCKED}.{BLOCKED}.0.130
  • {BLOCKED}.{BLOCKED}.1.130
  • {BLOCKED}.{BLOCKED}114.133
  • {BLOCKED}.{BLOCKED}114.166
  • {BLOCKED}.{BLOCKED}128.68
  • {BLOCKED}.{BLOCKED}192.68
  • {BLOCKED}.{BLOCKED}254.34
  • {BLOCKED}.{BLOCKED}163.68
  • {BLOCKED}.{BLOCKED}1.4
  • {BLOCKED}.{BLOCKED}2.69
  • {BLOCKED}.{BLOCKED}39.73
  • {BLOCKED}.{BLOCKED}54.66
  • {BLOCKED}.{BLOCKED}37.1
  • {BLOCKED}.{BLOCKED}150.101
  • {BLOCKED}.{BLOCKED}150.123
  • {BLOCKED}.{BLOCKED}150.139
  • {BLOCKED}.{BLOCKED}25.129
  • {BLOCKED}.{BLOCKED}7.1
  • {BLOCKED}.{BLOCKED}98.3
  • {BLOCKED}.{BLOCKED}98.6
  • {BLOCKED}.{BLOCKED}9.61
  • {BLOCKED}.{BLOCKED}9.9
  • {BLOCKED}.{BLOCKED}254.5
  • {BLOCKED}.{BLOCKED}164.13
  • {BLOCKED}.{BLOCKED}164.18
  • {BLOCKED}.{BLOCKED}70.98
  • {BLOCKED}.{BLOCKED}93.33
  • {BLOCKED}.{BLOCKED}.1.1
  • {BLOCKED}.{BLOCKED}.233.1
  • {BLOCKED}.{BLOCKED}.224.3
  • {BLOCKED}.{BLOCKED}.224.5

It adds the following scripts in /etc/rc{1-5}.d/ and /etc/init.d/ to automatically execute itself when the system starts up:

  • /etc/rc{digit}.d/S{1-5}VsystemshMdt
  • /etc/rc{digit}.d/S{1-5}selinux
  • /etc/init.d/VsystemshMdt
  • /etc/init.d/selinux

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

12.831.50

FIRST VSAPI PATTERN DATE:

11 Oct 2016

VSAPI OPR PATTERN File:

12.832.50

VSAPI OPR PATTERN Date:

12 Oct 2016

Scan your computer with your Trend Micro product to delete files detected as ELF_SETAG.SM. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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