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 Enterprise v15

Reconnaissance

Resource Development

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

Hijack Execution Flow

T1574

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

System Network Configuration Discovery

T1016

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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

Download Submit
/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

Download Submit
/tmp/notify.file

Filesize
18B

MD5
dbf0cae3ba557b2fe0a5f3bc7821243c

SHA1
861e81be40ee86062a7f85c9cf2d4b51615f55e6

SHA256
5d826086f60d2c5eae7d702efa59b156b20e10a1b0d5b16eec99bfeb2f289109

SHA512
917ac571cfd6a84073a3f0a587a6b4939e57ca776b7d63e42e5973524be7f5d40c170f00c06512e1350c2a1c78876b20cbc7bdf7f74d6f58f979ea14a0976fae

Download Submit
/usr/bin/bsd-port/getty

Filesize
1.2MB

MD5
5ac9924723ee51a34999132cbd369213

SHA1
8bb17a17dc4a7885978c0161d7be2b0274a42466

SHA256
be9ce96a9612ff32bc0deae2ffed9f15116b644ec106d1906fe44a6776595291

SHA512
f0d1a0ca422c99b37c286b8d6b7b15ad48c6fc0991974623dfbe9c580499e868d36c771aa2d57b1784d515c4cc5524e846e20f5b252f6079b6f71c35c8ae389a

Download Submit
/usr/bin/dpkgd/lsof

Filesize
159KB

MD5
e093dc78225e2a0a25e3b137c1c1e442

SHA1
c29497cfaae729eb576875e4fdfa400640ab16be

SHA256
1190f4dbc7be174de8fd4096c9bf7a28eebfac937d308b7cc533be4a1240d26e

SHA512
fe1cc7a65327732eaaee89f427c10239ba822430e34177842f4681068d78d404b1830d808a2a71b1efcc5f126c6d8c053512237421173aaa150e215a672da6f0

Download Submit
/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

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