mrblack | 036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796

Analysis

max time kernel
149s
max time network
146s
platform
ubuntu-18.04_amd64
resource
ubuntu1804-amd64-20231222-en
resource tags

arch:amd64arch:i386image:ubuntu1804-amd64-20231222-enkernel:4.15.0-213-genericlocale:en-usos:ubuntu-18.04-amd64system
submitted
20-02-2024 05:12

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General

Target

036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf
Size

1.2MB
MD5

cb084b73d800c005e5a3cf4f299f032a
SHA1

770fca135b25594e77480cdca7116366be2ba91d
SHA256

036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796
SHA512

1b7476baa62f8388f933e2e15473bca928abf0d1128d551ca21a8d1b6615b04f2660f77bcf406df939d31c9916d42900a5c3dec50ebfa40ce1340ae545e41234
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX4B2y1q2rJp0:745vRVJKGtSA0VWeoYu9p0

Score

10^/10

mrblack antivm botnet persistence trojan

Malware Config

Signatures

MrBlack Trojan
IoT botnet which infects routers to be used for DDoS attacks.
trojan botnet mrblack

MrBlack trojan 1 IoCs

Processes:

resource	yara_rule
/usr/bin/bsd-port/getty	family_mrblack

Executes dropped EXE 2 IoCs

Processes:

getty.sshd

ioc pid process

/usr/bin/bsd-port/getty 1610 getty
/usr/bin/.sshd 1637 .sshd
Checks CPU configuration 1 TTPs 1 IoCs
Checks CPU information which indicate if the system is a virtual machine.
antivm

Virtualization/Sandbox Evasion
T1497

Processes:

description ioc

File opened for reading /proc/cpuinfo
Modifies init.d 1 TTPs 2 IoCs
Adds/modifies system service, likely for persistence.
persistence

Boot or Logon Autostart Execution
T1547

Processes:

description ioc

File opened for modification /etc/init.d/DbSecuritySpt
File opened for modification /etc/init.d/selinux
Reads system routing table 1 TTPs 1 IoCs
Gets active network interfaces from /proc virtual filesystem.

System Network Configuration Discovery
T1016

Processes:

description ioc

File opened for reading /proc/net/route

ioc	pid	process
/usr/bin/bsd-port/getty	1610	getty
/usr/bin/.sshd	1637	.sshd

description	ioc
File opened for reading	/proc/cpuinfo

description	ioc
File opened for modification	/etc/init.d/DbSecuritySpt
File opened for modification	/etc/init.d/selinux

description	ioc
File opened for reading	/proc/net/route

Write file to user bin folder 1 TTPs 9 IoCs

Hijack Execution Flow

T1574

Processes:

cpcpcpcpcpcp

description	ioc	process
File opened for modification	/usr/bin/.sshd	cp
File opened for modification	/usr/bin/dpkgd/ps	cp
File opened for modification	/usr/bin/dpkgd/lsof	cp
File opened for modification	/usr/bin/bsd-port/conf.n
File opened for modification	/usr/bin/bsd-port/getty.lock
File opened for modification	/usr/bin/bsd-port/udevd.lock
File opened for modification	/usr/bin/bsd-port/getty	cp
File opened for modification	/usr/bin/dpkgd/ss	cp
File opened for modification	/usr/bin/lsof	cp

Writes file to system bin folder 1 TTPs 2 IoCs

Hijack Execution Flow
T1574

Processes:

cpcp

description ioc process

File opened for modification /bin/ps cp
File opened for modification /bin/ss cp
Reads system network configuration 1 TTPs 3 IoCs
Uses contents of /proc filesystem to enumerate network settings.

System Network Configuration Discovery
T1016

Processes:

description ioc

File opened for reading /proc/net/dev
File opened for reading /proc/net/route
File opened for reading /proc/net/arp

description	ioc	process
File opened for modification	/bin/ps	cp
File opened for modification	/bin/ss	cp

description	ioc
File opened for reading	/proc/net/dev
File opened for reading	/proc/net/route
File opened for reading	/proc/net/arp

Reads runtime system information 23 IoCs

Reads data from /proc virtual filesystem.

Processes:

mkdirmkdircpcpmkdircpmkdirmkdirmkdircpmkdirinsmodinsmodmkdirmkdircpcpcpcpmkdirmkdir

description	ioc	process
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/meminfo
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/stat
File opened for reading	/proc/cmdline	insmod
File opened for reading	/proc/cmdline	insmod
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/filesystems	mkdir

Writes file to tmp directory 5 IoCs

Malware often drops required files in the /tmp directory.

Processes:

description	ioc
File opened for modification	/tmp/moni.lod
File opened for modification	/tmp/bill.lock
File opened for modification	/tmp/gates.lod
File opened for modification	/tmp/notify.file
File opened for modification	/tmp/conf.n

/tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf
/tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf
1⤵
PID:1577

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1583

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
2⤵
PID:1584

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt"
1⤵
PID:1585

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt
2⤵
PID:1586

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt"
1⤵
PID:1587

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt
2⤵
PID:1588

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt"
1⤵
PID:1589

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt
2⤵
PID:1590

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt"
1⤵
PID:1591

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
2⤵
PID:1592

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1593

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1594

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1595

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1596

/bin/sh
sh -c "cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/bsd-port/getty"
1⤵
PID:1597

/bin/cp
cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/bsd-port/getty
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1598

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1609

/usr/bin/bsd-port/getty
/usr/bin/bsd-port/getty
2⤵
- Executes dropped EXE
PID:1610

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1612

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1613

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1614

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1615

/bin/sh
sh -c "cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/.sshd"
1⤵
PID:1616

/bin/cp
cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/.sshd
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1617

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1619

/bin/ln
ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
2⤵
PID:1620

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1621

/bin/ln
ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
2⤵
PID:1622

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1623

/bin/ln
ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
2⤵
PID:1624

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1625

/bin/ln
ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
2⤵
PID:1626

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1627

/bin/ln
ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
2⤵
PID:1628

/bin/sh
sh -c "mkdir -p /usr/bin/dpkgd"
1⤵
PID:1629

/bin/mkdir
mkdir -p /usr/bin/dpkgd
2⤵
- Reads runtime system information
PID:1630

/bin/sh
sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
1⤵
PID:1631

/bin/cp
cp -f /bin/ps /usr/bin/dpkgd/ps
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1632

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1633

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1634

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1636

/usr/bin/.sshd
/usr/bin/.sshd
2⤵
- Executes dropped EXE
PID:1637

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1638

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1639

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1640

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ps
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1641

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1642

/bin/chmod
chmod 0755 /bin/ps
2⤵
PID:1643

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1644

/bin/cp
cp -f /bin/ss /usr/bin/dpkgd/ss
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1645

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1646

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1647

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1648

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1649

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1650

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ss
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1651

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1652

/bin/chmod
chmod 0755 /bin/ss
2⤵
PID:1653

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1654

/bin/cp
cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1655

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1656

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1657

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1658

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1659

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /usr/bin/lsof"
1⤵
PID:1660

/bin/cp
cp -f /usr/bin/bsd-port/getty /usr/bin/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1661

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1662

/bin/chmod
chmod 0755 /usr/bin/lsof
2⤵
PID:1663

/bin/sh
sh -c "insmod /usr/bin/bsd-port/xpacket.ko"
1⤵
PID:1666

/sbin/insmod
insmod /usr/bin/bsd-port/xpacket.ko
2⤵
- Reads runtime system information
PID:1667

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1672

/sbin/insmod
insmod /tmp/xpacket.ko
2⤵
- Reads runtime system information
PID:1673

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Hijack Execution Flow

T1574

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Hijack Execution Flow

T1574

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Hijack Execution Flow

T1574

Credential Access

Discovery

Virtualization/Sandbox Evasion

T1497

System Network Configuration Discovery

T1016

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

/etc/init.d/DbSecuritySpt
Filesize
86B

MD5
439913205f47f0bb746f717431038aeb

SHA1
42953da470acce1bbdf27536ed4b5bab202e6c46

SHA256
bd9c6d83a45470bacb5264bf623ff96d1e9752e58c737bc567c81c5cdafd78e0

SHA512
d9996008f5a534fe0fc1dc9536710aec0e2b3de5cf8ec94c9439086a8e6580623de6d40183520d2d2dfb6582e4c72a352e1024d94e64d2f3b191e1855e50c00c

Download Submit
/etc/init.d/selinux
Filesize
36B

MD5
993cc15058142d96c3daf7852c3d5ee8

SHA1
0950b8b391b04dd3895ea33cd3141543ebd2525d

SHA256
8171d077918611803d93088409f220c66fae1c670b297e1aa5d8cbd548ce9208

SHA512
0c4256c00a3710f97e92581b552682b36b62afc35fe72622c491323c618c19ea62611ac04ccafc3dfcde2254a2ebbd93b69b66795b16e36332293bed83adb928

Download Submit
/tmp/gates.lod
Filesize
4B

MD5
95d309f0b035d97f69902e7972c2b2e6

SHA1
925d1b50cf96fe5447879b4b57ef57c168e4fc34

SHA256
c6437e0ba0560952cb942343f521c60fc3f2247dd1aebf95460c1a070b263051

SHA512
3daf0e76b34d4bb1db74a191ca24bb736ce79d0e2fd11fb71daeb33b414ca121d3f45f48b709ed4d6f710893507db3159a2129c25ea310afad4d50e62314a031

Download Submit
/tmp/moni.lod
Filesize
4B

MD5
4f398cb9d6bc79ae567298335b51ba8a

SHA1
776f707e19f39e6b830856a6cdf3aa605a5a283e

SHA256
5aca6f08b6780157a0da46aaaef9d86d2fe55919395b0e2aba71e52a377db90d

SHA512
6ea469870849ab48a14a65e433a1dd2fd7741ea7ed01c586424111f35256737a861c4527c66528b3ea489a6e22ed4732074167fdb152de9441d2f1958e94beca

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/tmp/notify.file
Filesize
73B

MD5
bc01940555c09662cec74116e974b2ce

SHA1
b257d533ba95e2db7bdbbb760bee19bb7817eed6

SHA256
54565be026e653ed9525b423f6346a83b4f5b65173715e6826cfc88a15bcb9db

SHA512
35a4d144f0ad23ba861067f4639a66166ad7dcf6dcf867c4e3aaf643e9308789310454e596b9b6c3e6ac6329f9187b26d87fa0c77d2c4d50ba6fd2f0a8c4f6ff

Download Submit
/usr/bin/bsd-port/conf.n
Filesize
73B

MD5
6cd455165a6413ec7cf19488ca44838a

SHA1
d5810f05839689c2e35fbf16dc6a3030c9ac4a2e

SHA256
8daee42374a208a89fbb370e08b46a2f85d67e07c01d1e5dac6f22deaaf29bcf

SHA512
a9f83b845a15cbd5078555e07943b56bcd7e66dcb78d95b952b82b7fcefbbef036359dfc90d88e61e64308937ca5d747ac31b5fb8f3bd5904444ae2f4868003a

Download Submit
/usr/bin/bsd-port/getty
Filesize
1.2MB

MD5
cb084b73d800c005e5a3cf4f299f032a

SHA1
770fca135b25594e77480cdca7116366be2ba91d

SHA256
036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796

SHA512
1b7476baa62f8388f933e2e15473bca928abf0d1128d551ca21a8d1b6615b04f2660f77bcf406df939d31c9916d42900a5c3dec50ebfa40ce1340ae545e41234

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/usr/bin/dpkgd/lsof
Filesize
159KB

MD5
e093dc78225e2a0a25e3b137c1c1e442

SHA1
c29497cfaae729eb576875e4fdfa400640ab16be

SHA256
1190f4dbc7be174de8fd4096c9bf7a28eebfac937d308b7cc533be4a1240d26e

SHA512
fe1cc7a65327732eaaee89f427c10239ba822430e34177842f4681068d78d404b1830d808a2a71b1efcc5f126c6d8c053512237421173aaa150e215a672da6f0

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/usr/bin/dpkgd/ps
Filesize
130KB

MD5
558edc26f8a38fa9788220b9af8a73e7

SHA1
3024d44e580e9c67f32f6c585d50e2a6cc9a7cac

SHA256
b76435c80333d2c1fd18e0e7682f1c9dfb5da8d507e93e3c416f54b481c428d5

SHA512
edaa425b441044f015e8f68fffa1664e42372d00dd0e7b0924d24ce947aa8e5f96b3bdc326fa2f8b978e3fcf638a1ceca45a223735db73f1607df66990feb56f

Download Submit
/usr/bin/dpkgd/ss
Filesize
136KB

MD5
1dc929b5f2cd12fe6a2fe71140d2a9e3

SHA1
f9995a92bb201b1b7738a39a38570ef0c40b52d2

SHA256
418aae1da62554afe9f260866267af328fd761b3fd6f90f0ea53d543e2fefc38

SHA512
fbed011c595084548db440dfbe485b7d27032a44a6ae9e141fe43f31c8c524ff9347135ab035deb441fca99e5a3794f7bb9194f148aa2f60f1547a7c67d47373

Download Submit