Analysis by: Mar Philip Elaurza
ALIASES:

Backdoor:Linux/Setag!rfn (Microsoft), Linux/Setag.B.Gen trojan (ESET)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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 Size: 1,223,123 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 07 Apr 2016

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.

Installation

This backdoor drops the following files:

  • /tmp/bill.lock
  • /tmp/notify.file
  • /proc/net/pktgen/kpktgend_{number}
  • /proc/net/pktgen/pgctrl

It drops the following copies of itself into the affected system:

  • /usr/lib/libamplify.so

Other Details

This backdoor connects to the following possibly malicious URL:

  • {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 does the following:

  • It is capable of performing DDoS attacks

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.470.03
FIRST VSAPI PATTERN DATE: 16 Apr 2016
VSAPI OPR PATTERN File: 12.471.00
VSAPI OPR PATTERN Date: 17 Apr 2016

Scan your computer with your Trend Micro product to delete files detected as ELF_SETAG.TNI. 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 this Knowledge Base page for more information.


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