mrblack | be9ce96a9612ff32bc0deae2ffed9f15116b644ec106d1906fe44a6776595291

Analysis

max time kernel
149s
max time network
147s
platform
ubuntu-18.04_amd64
resource
ubuntu1804-amd64-20240226-en
resource tags

arch:amd64arch:i386image:ubuntu1804-amd64-20240226-enkernel:4.15.0-213-genericlocale:en-usos:ubuntu-18.04-amd64system
submitted
19-03-2024 16:12

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General

Target

65533.exe.elf
Size

1.2MB
MD5

5ac9924723ee51a34999132cbd369213
SHA1

8bb17a17dc4a7885978c0161d7be2b0274a42466
SHA256

be9ce96a9612ff32bc0deae2ffed9f15116b644ec106d1906fe44a6776595291
SHA512

f0d1a0ca422c99b37c286b8d6b7b15ad48c6fc0991974623dfbe9c580499e868d36c771aa2d57b1784d515c4cc5524e846e20f5b252f6079b6f71c35c8ae389a
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX4R2y1q2rJp0:745vRVJKGtSA0VWeoIu9p0

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 1623 getty
/usr/bin/.sshd 1650 .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	1623	getty
/usr/bin/.sshd	1650	.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 8 IoCs

Hijack Execution Flow

T1574

Processes:

cpcpcpcpcpcp

description	ioc
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/.sshd	cp
File opened for modification	/usr/bin/dpkgd/ps	cp
File opened for modification	/usr/bin/dpkgd/ss	cp
File opened for modification	/usr/bin/dpkgd/lsof	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/arp
File opened for reading /proc/net/dev
File opened for reading /proc/net/route

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

Reads runtime system information 23 IoCs

Reads data from /proc virtual filesystem.

Processes:

mkdircpcpmkdirmkdircpcpmkdirmkdirinsmodinsmodcpmkdircpcpmkdircpmkdirmkdirmkdirmkdir

description	ioc	process
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	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	mkdir
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/meminfo
File opened for reading	/proc/cmdline	insmod
File opened for reading	/proc/cmdline	insmod
File opened for reading	/proc/filesystems	cp
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	mkdir
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/stat
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	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/65533.exe.elf
/tmp/65533.exe.elf
1⤵
PID:1582

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1605

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
2⤵
PID:1606

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt"
1⤵
PID:1607

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt
2⤵
PID:1608

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt"
1⤵
PID:1609

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt
2⤵
PID:1610

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt"
1⤵
PID:1611

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt
2⤵
PID:1612

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt"
1⤵
PID:1613

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
2⤵
PID:1614

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1615

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1616

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1617

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1618

/bin/sh
sh -c "cp -f /tmp/65533.exe.elf /usr/bin/bsd-port/getty"
1⤵
PID:1619

/bin/cp
cp -f /tmp/65533.exe.elf /usr/bin/bsd-port/getty
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1620

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1622

/usr/bin/bsd-port/getty
/usr/bin/bsd-port/getty
2⤵
- Executes dropped EXE
PID:1623

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1625

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1626

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1627

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1628

/bin/sh
sh -c "cp -f /tmp/65533.exe.elf /usr/bin/.sshd"
1⤵
PID:1629

/bin/cp
cp -f /tmp/65533.exe.elf /usr/bin/.sshd
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1630

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1631

/bin/ln
ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
2⤵
PID:1632

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1633

/bin/ln
ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
2⤵
PID:1634

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1635

/bin/ln
ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
2⤵
PID:1636

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1637

/bin/ln
ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
2⤵
PID:1638

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1639

/bin/ln
ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
2⤵
PID:1640

/bin/sh
sh -c "mkdir -p /usr/bin/dpkgd"
1⤵
PID:1641

/bin/mkdir
mkdir -p /usr/bin/dpkgd
2⤵
- Reads runtime system information
PID:1642

/bin/sh
sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
1⤵
PID:1643

/bin/cp
cp -f /bin/ps /usr/bin/dpkgd/ps
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1644

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1645

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1646

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1647

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1651

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1649

/usr/bin/.sshd
/usr/bin/.sshd
2⤵
- Executes dropped EXE
PID:1650

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1652

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ps
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1653

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1654

/bin/chmod
chmod 0755 /bin/ps
2⤵
PID:1655

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1656

/bin/cp
cp -f /bin/ss /usr/bin/dpkgd/ss
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1657

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

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

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1660

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1661

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1662

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ss
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1663

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1664

/bin/chmod
chmod 0755 /bin/ss
2⤵
PID:1665

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1666

/bin/cp
cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1667

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1668

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1669

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1670

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1671

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /usr/bin/lsof"
1⤵
PID:1672

/bin/cp
cp -f /usr/bin/bsd-port/getty /usr/bin/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1673

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1674

/bin/chmod
chmod 0755 /usr/bin/lsof
2⤵
PID:1675

/bin/sh
sh -c "insmod /usr/bin/bsd-port/xpacket.ko"
1⤵
PID:1678

/sbin/insmod
insmod /usr/bin/bsd-port/xpacket.ko
2⤵
- Reads runtime system information
PID:1679

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1684

/sbin/insmod
insmod /tmp/xpacket.ko
2⤵
- Reads runtime system information
PID:1685

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
31B

MD5
7654a8bcecf2f062c8fb8fa5e125cc64

SHA1
f0843a354f6562e3e1ef017d0821c21dff791885

SHA256
24609aa546669a836d35b1503de1cc8d6aa4d2a8b86acd091fe7e6005290e7f6

SHA512
c3db1a99c1ec163dd21d4b6f06619e9180985b350a11e0e9ef56cba7ff0dc1413b0c84d6a6269602acdb251d0d725844642b69b615eeb7e04654229359684d7a

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

MD5
993cc15058142d96c3daf7852c3d5ee8

SHA1
0950b8b391b04dd3895ea33cd3141543ebd2525d

SHA256
8171d077918611803d93088409f220c66fae1c670b297e1aa5d8cbd548ce9208

SHA512
0c4256c00a3710f97e92581b552682b36b62afc35fe72622c491323c618c19ea62611ac04ccafc3dfcde2254a2ebbd93b69b66795b16e36332293bed83adb928

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/tmp/gates.lod
Filesize
4B

MD5
5129a5ddcd0dcd755232baa04c231698

SHA1
b2a3625de074749ed626d2c2fdf5342d7757a850

SHA256
e52522a505f68250e81747aa5386c5c60196c1680f1c89762ab1ab0fbaae39b8

SHA512
27f36a56ba7f81569a7edcada4b457648cef41168a85cadf11c6e649295b110569e060047c624376a3dd8372edf153ae15c954cce7e308e8f826884a707d12c9

Download Submit
/tmp/moni.lod
Filesize
4B

MD5
831c2f88a604a07ca94314b56a4921b8

SHA1
e4fb11694cd7bab54173d1d9664eb70b6b6b8a14

SHA256
df6822cd01387e05c8ea01eae408dacae839ebf27c2ce1ffa3b6a0b7f3f0ffa1

SHA512
10a3f9ea81f15a045197d0afa900930081489c363acb934d7aa3125c1f32540dea17e0d47612a70fcf3707c35573372033214ffdb9314e5c636a2d0f45920a9d

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/tmp/notify.file
Filesize
18B

MD5
dbf0cae3ba557b2fe0a5f3bc7821243c

SHA1
861e81be40ee86062a7f85c9cf2d4b51615f55e6

SHA256
5d826086f60d2c5eae7d702efa59b156b20e10a1b0d5b16eec99bfeb2f289109

SHA512
917ac571cfd6a84073a3f0a587a6b4939e57ca776b7d63e42e5973524be7f5d40c170f00c06512e1350c2a1c78876b20cbc7bdf7f74d6f58f979ea14a0976fae

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

MD5
5ac9924723ee51a34999132cbd369213

SHA1
8bb17a17dc4a7885978c0161d7be2b0274a42466

SHA256
be9ce96a9612ff32bc0deae2ffed9f15116b644ec106d1906fe44a6776595291

SHA512
f0d1a0ca422c99b37c286b8d6b7b15ad48c6fc0991974623dfbe9c580499e868d36c771aa2d57b1784d515c4cc5524e846e20f5b252f6079b6f71c35c8ae389a

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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

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/usr/bin/dpkgd/ss
Filesize
136KB

MD5
1dc929b5f2cd12fe6a2fe71140d2a9e3

SHA1
f9995a92bb201b1b7738a39a38570ef0c40b52d2

SHA256
418aae1da62554afe9f260866267af328fd761b3fd6f90f0ea53d543e2fefc38

SHA512
fbed011c595084548db440dfbe485b7d27032a44a6ae9e141fe43f31c8c524ff9347135ab035deb441fca99e5a3794f7bb9194f148aa2f60f1547a7c67d47373

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