Library
My library

+ Add to library

Contact us
24/7 Tech support | Rules regarding submitting

Send a message

Your tickets

Profile

Virus library

An analysis of the technologies used by cybercriminals allows us to draw conclusions about the virus industry’s possible vectors of development and more effectively confront future threats. You, too, can learn what actions various malicious programs take in infected systems and how to withstand them.

Linux in virus library:

A family of Linux Trojans. One of its representatives is described below.

SHA1:

  • 7e0e07d19b9c57149e72a7ed266e0c8aa5019a6f

A modified version of Linux.DDoS.87 and Linux.DDoS.89. Its main differences from Linux.DDoS.89 are as follows:

  1. Some samples of the Trojan can now delete themselves.
  2. The Trojan can disable the watchdog timer, which prevents system hangs, to make it impossible to reboot the computer.
  3. The process’s name is changed to a random sequence containing the characters [a-z 0-9].
  4. The configuration structure has been changed.
  5. If a process named “.anime” is found, the Runkiller function not only terminates this process but also deletes the executable file.
  6. Unlike Linux.DDoS.89, this version can execute HTTP Flood attacks.
  7. If the Trojan fails to create a socket and connect to it, the corresponding function searches for the process that owns the socket and kills it.

The Trojan’s configuration looks as follows:

NumberValuePurpose
3listening tun0main output to stdin
4HostCommand and control (C&C) server’s IP address
5PortC&C server’s port
6"https://youtube.com/watch?v=dQw4w9WgXcQ"
7"/proc/" runkiller
8"/exe" runkiller
9" (deleted)"
10"/fd" runkiller
11".anime"runkiller
12"REPORT %s:%s"runkiller
13"HTTPFLOOD"runkiller
14"LOLNOGTFO"runkiller
15"\x58\x4D\x4E\x4E\x43\x50\x46\x22"runkiller
16"zollard"runkiller
17"GETLOCALIP"
18Host
19Port
20"shell"
21"enable"
22"system"
23"sh"
24"/bin/busybox MIRAI"
25"MIRAI: applet not found"
26"ncorrect"
27"/bin/busybox ps"
28"/bin/busybox kill -9 "
29"TSource Engine Query"
30"/etc/resolv.conf"
31"nameserver"
32"Connection: keep-alive"
33"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"
34"Accept-Language: en-US,en;q=0.8"
35"Content-Type: application/x-www-form-urlencoded"
36"setCookie('"
37"refresh:"
38"location:"
39"set-cookie:"
40"content-length:"
41"transfer-encoding:"
42"chunked"
43"keep-alive"
44"connection:"
45"server: dosarrest"
46"server: cloudflare-nginx"
47"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36" User Agent
48"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36" User Agent
49"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36" User Agent
50"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36" User Agent
51"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/601.7.7 (KHTML, like Gecko) Version/9.1.2 Safari/601.7.7" User Agent

All samples of the Trojan use a function that hides the following strings:

def decode(str_enc):
  return "".join([chr(ord(x) ^ 0x22) for x in str_enc])

Once launched, the Trojan removes its executable file from the disk, blocks the SIGINT signal with the help of sigprocmask, and sets the parameter SIG_IGN for SIGCHLD and a handler for SIGTRAP.

Then the Trojan tries to open the /dev/watchdog file for reading/writing (/dev/misc/watchdog is also checked) and, if successful, disables the watchdog timer.

ioctl(fd, WDIOC_SETOPTION, WDIOS_DISABLECARD)

The Trojan subsequently opens a root folder and sends a request to the address 8.8.8.8:53 to get the IP address of its network traffic.

Next, the Trojan calculates a function taken from the argv[0] value:

def check(name):
    print name
    a = [ord(x) for x in name]
    sum = (0 - 0x51) & 0xff
    for i in [2,4,6,8,10,12]:
        z =  (~a[i % len(a)] & 0xff)
        sum = (sum + z)&0xff
        #print "%x %x %x" % (z, sum, sum % 9)
    return sum % 9

This function returns a number from 0 to 8 that represents an index in a function array:

off_8055DC0     dd offset bind_socket   ; DATA XREF: main+109o
.rodata:08055DC4                     dd offset sub_80517E0
.rodata:08055DC8                     dd offset sub_8051730
.rodata:08055DCC                     dd offset create_config
.rodata:08055DD0                     dd offset sub_8051760
.rodata:08055DD4                     dd offset sub_80523F0
.rodata:08055DD8                     dd offset strcopy
.rodata:08055DDC                     dd offset runkiller
.rodata:08055DE0                     dd offset sub_804E900

If argv[0] == “./dvrHelper”, a parental process receives the SIGTRAP signal (for which a handler was previously installed). The handler, in turn, modifies the IP address taken from the configuration and the C&C server’s port to which the Trojan will connect.

Then a listening socket is opened at the address 127.0.0.1:48101. If this port is busy with another process, the Trojan runs a function that finds the process and kills it.

The Trojan subsequently generates a name that looks like a random sequence containing the characters [a-z 0-9] and writes it to argv[0]. Using the prctl function, the process’s name is changed to a random one.

Next, the Trojan creates child processes and terminates the parental one. All further steps are performed in a child process—in particular, a structure containing handlers is filled in. Then a function responsible for scanning telnet nodes and a function that terminates the processes of other Trojans are launched. The Trojan then runs a handler for incoming instructions sent from the C&C server. If the Trojan detects that a connection to a local server is being established, it runs a child process to scan vulnerable telnet nodes and terminates the parental process.

The picture below shows a code fragment for Linux.DDoS.87 (left column) and Linux.Mirai (right column).

screen Linux.DDoS.87 #drweb screen Linux.Mirai #drweb

Linux aliases:

A family of Linux Trojans. One of its representatives is described below.

SHA1:

  • 7e0e07d19b9c57149e72a7ed266e0c8aa5019a6f

A modified version of Linux.DDoS.87 and Linux.DDoS.89. Its main differences from Linux.DDoS.89 are as follows:

  1. Some samples of the Trojan can now delete themselves.
  2. The Trojan can disable the watchdog timer, which prevents system hangs, to make it impossible to reboot the computer.
  3. The process’s name is changed to a random sequence containing the characters [a-z 0-9].
  4. The configuration structure has been changed.
  5. If a process named “.anime” is found, the Runkiller function not only terminates this process but also deletes the executable file.
  6. Unlike Linux.DDoS.89, this version can execute HTTP Flood attacks.
  7. If the Trojan fails to create a socket and connect to it, the corresponding function searches for the process that owns the socket and kills it.

The Trojan’s configuration looks as follows:

NumberValuePurpose
3listening tun0main output to stdin
4HostCommand and control (C&C) server’s IP address
5PortC&C server’s port
6"https://youtube.com/watch?v=dQw4w9WgXcQ"
7"/proc/" runkiller
8"/exe" runkiller
9" (deleted)"
10"/fd" runkiller
11".anime"runkiller
12"REPORT %s:%s"runkiller
13"HTTPFLOOD"runkiller
14"LOLNOGTFO"runkiller
15"\x58\x4D\x4E\x4E\x43\x50\x46\x22"runkiller
16"zollard"runkiller
17"GETLOCALIP"
18Host
19Port
20"shell"
21"enable"
22"system"
23"sh"
24"/bin/busybox MIRAI"
25"MIRAI: applet not found"
26"ncorrect"
27"/bin/busybox ps"
28"/bin/busybox kill -9 "
29"TSource Engine Query"
30"/etc/resolv.conf"
31"nameserver"
32"Connection: keep-alive"
33"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"
34"Accept-Language: en-US,en;q=0.8"
35"Content-Type: application/x-www-form-urlencoded"
36"setCookie('"
37"refresh:"
38"location:"
39"set-cookie:"
40"content-length:"
41"transfer-encoding:"
42"chunked"
43"keep-alive"
44"connection:"
45"server: dosarrest"
46"server: cloudflare-nginx"
47"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36" User Agent
48"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36" User Agent
49"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36" User Agent
50"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36" User Agent
51"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/601.7.7 (KHTML, like Gecko) Version/9.1.2 Safari/601.7.7" User Agent

All samples of the Trojan use a function that hides the following strings:

def decode(str_enc):
  return "".join([chr(ord(x) ^ 0x22) for x in str_enc])

Once launched, the Trojan removes its executable file from the disk, blocks the SIGINT signal with the help of sigprocmask, and sets the parameter SIG_IGN for SIGCHLD and a handler for SIGTRAP.

Then the Trojan tries to open the /dev/watchdog file for reading/writing (/dev/misc/watchdog is also checked) and, if successful, disables the watchdog timer.

ioctl(fd, WDIOC_SETOPTION, WDIOS_DISABLECARD)

The Trojan subsequently opens a root folder and sends a request to the address 8.8.8.8:53 to get the IP address of its network traffic.

Next, the Trojan calculates a function taken from the argv[0] value:

def check(name):
    print name
    a = [ord(x) for x in name]
    sum = (0 - 0x51) & 0xff
    for i in [2,4,6,8,10,12]:
        z =  (~a[i % len(a)] & 0xff)
        sum = (sum + z)&0xff
        #print "%x %x %x" % (z, sum, sum % 9)
    return sum % 9

This function returns a number from 0 to 8 that represents an index in a function array:

off_8055DC0     dd offset bind_socket   ; DATA XREF: main+109o
.rodata:08055DC4                     dd offset sub_80517E0
.rodata:08055DC8                     dd offset sub_8051730
.rodata:08055DCC                     dd offset create_config
.rodata:08055DD0                     dd offset sub_8051760
.rodata:08055DD4                     dd offset sub_80523F0
.rodata:08055DD8                     dd offset strcopy
.rodata:08055DDC                     dd offset runkiller
.rodata:08055DE0                     dd offset sub_804E900

If argv[0] == “./dvrHelper”, a parental process receives the SIGTRAP signal (for which a handler was previously installed). The handler, in turn, modifies the IP address taken from the configuration and the C&C server’s port to which the Trojan will connect.

Then a listening socket is opened at the address 127.0.0.1:48101. If this port is busy with another process, the Trojan runs a function that finds the process and kills it.

The Trojan subsequently generates a name that looks like a random sequence containing the characters [a-z 0-9] and writes it to argv[0]. Using the prctl function, the process’s name is changed to a random one.

Next, the Trojan creates child processes and terminates the parental one. All further steps are performed in a child process—in particular, a structure containing handlers is filled in. Then a function responsible for scanning telnet nodes and a function that terminates the processes of other Trojans are launched. The Trojan then runs a handler for incoming instructions sent from the C&C server. If the Trojan detects that a connection to a local server is being established, it runs a child process to scan vulnerable telnet nodes and terminates the parental process.

The picture below shows a code fragment for Linux.DDoS.87 (left column) and Linux.Mirai (right column).

screen Linux.DDoS.87 #drweb screen Linux.Mirai #drweb

Name Vendor Dr.Web classification name
Linux Avira Elf.dropper.2647

Linux in virus library:

Linux.Mirai.2985
Linux.Mirai.2986
Linux.Mirai.2987
Linux.Mirai.2988
Linux.Mirai.2989
Linux.Mirai.2990
Linux.Mirai.2991
Linux.Mirai.2992
Linux.Mirai.2993
Linux.Mirai.2994
Linux.Mirai.2995
Linux.Mirai.2996
Linux.Mirai.3030
Linux.Mirai.3031
Linux.Mirai.3032
Linux.Mirai.3033
Linux.Mirai.3034
Linux.Mirai.3035
Linux.Mirai.3036
Linux.Mirai.3037
Linux.Mirai.3074
Linux.Mirai.3076
Linux.Mirai.3077
Linux.Mirai.3078
Linux.Mirai.3079
Linux.Mirai.3080
Linux.Mirai.3081
Linux.Mirai.3082
Linux.Mirai.3083
Linux.Mirai.3084
Linux.Mirai.3085
Linux.Mirai.3086
Linux.Mirai.3087
Linux.Mirai.3088
Linux.Mirai.3089
Linux.Mirai.3090
Linux.Mirai.3091
Linux.Mirai.3097
Linux.Mirai.3099
Linux.Mirai.3111
Linux.Mirai.3155
Linux.Mirai.3156
Linux.Mirai.3157
Linux.Mirai.3161
Linux.Mirai.3162
Linux.Mirai.3163
Linux.Mirai.3224
Linux.Mirai.3287
Linux.Mirai.3293
Linux.Mirai.3344

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132

Vulnerabilities for Android

According to statistics, every fifth program for Android contains a vulnerability (or, in other words, a "loophole") that lets cybercriminals successfully introduce Trojans onto mobile devices and manipulate them into doing whatever actions they need them to.

Dr.Web Security Auditor for Android diagnoses and analyses a mobile device’s security and offers solutions to address security problems and vulnerabilities.