mrblack | 3830e4df2c7df94afeac2f7ed1f4bb05ccceb1f7dea6cd26e7da1295451eedbb

Analysis

max time kernel
153s
max time network
132s
platform
ubuntu-18.04_amd64
resource
ubuntu1804-amd64-20231215-en
resource tags

arch:amd64arch:i386image:ubuntu1804-amd64-20231215-enkernel:4.15.0-213-genericlocale:en-usos:ubuntu-18.04-amd64system
submitted
22-12-2023 12:57

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General

Target

9377c366fd7f87270414a73b0d3ac8aa
Size

1.2MB
MD5

9377c366fd7f87270414a73b0d3ac8aa
SHA1

cecc9d46426184a6c09609261882c1f2c842887a
SHA256

3830e4df2c7df94afeac2f7ed1f4bb05ccceb1f7dea6cd26e7da1295451eedbb
SHA512

2436b1c311b5f41dfb2d1d8e96be7c1d5569b8db3f051c53085ad6aa5ba3595ce04e42a7c38eedacc1c81f2e6cc8153ed519c576e53e1b55fc7c44a510b2c331
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX4v2y1q2rJp0:745vRVJKGtSA0VWeoOu9p0

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 1563 getty
/usr/bin/.sshd 1585 .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

ioc	pid	process
/usr/bin/bsd-port/getty	1563	getty
/usr/bin/.sshd	1585	.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

Write file to user bin folder 1 TTPs 8 IoCs

Hijack Execution Flow

T1574

Processes:

cpcpcpcpcpcp

description	ioc	process
File opened for modification	/usr/bin/dpkgd/lsof	cp
File opened for modification	/usr/bin/lsof	cp
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

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 1 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

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

Reads runtime system information 23 IoCs

Reads data from /proc virtual filesystem.

Processes:

mkdircpcpcpmkdirmkdircpmkdircpcpcpinsmodmkdirmkdirmkdirmkdircpmkdirmkdirmkdirinsmod

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	cp
File opened for reading	/proc/filesystems	mkdir
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	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	cp
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	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/filesystems	mkdir
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/stat
File opened for reading	/proc/cmdline	insmod

Writes file to tmp directory 4 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

/tmp/9377c366fd7f87270414a73b0d3ac8aa
/tmp/9377c366fd7f87270414a73b0d3ac8aa
1⤵
PID:1526

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1535

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
2⤵
PID:1538

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt"
1⤵
PID:1541

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt
2⤵
PID:1542

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt"
1⤵
PID:1543

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt
2⤵
PID:1544

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt"
1⤵
PID:1545

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt
2⤵
PID:1546

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt"
1⤵
PID:1549

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
2⤵
PID:1550

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1555

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1556

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1557

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1558

/bin/sh
sh -c "cp -f /tmp/9377c366fd7f87270414a73b0d3ac8aa /usr/bin/bsd-port/getty"
1⤵
PID:1559

/bin/cp
cp -f /tmp/9377c366fd7f87270414a73b0d3ac8aa /usr/bin/bsd-port/getty
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1560

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1562

/usr/bin/bsd-port/getty
/usr/bin/bsd-port/getty
2⤵
- Executes dropped EXE
PID:1563

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1565

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1566

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1567

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1568

/bin/sh
sh -c "cp -f /tmp/9377c366fd7f87270414a73b0d3ac8aa /usr/bin/.sshd"
1⤵
PID:1569

/bin/cp
cp -f /tmp/9377c366fd7f87270414a73b0d3ac8aa /usr/bin/.sshd
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1570

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1571

/bin/ln
ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
2⤵
PID:1572

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1573

/bin/ln
ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
2⤵
PID:1574

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1575

/bin/ln
ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
2⤵
PID:1576

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1577

/bin/ln
ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
2⤵
PID:1578

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1579

/bin/ln
ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
2⤵
PID:1580

/bin/sh
sh -c "mkdir -p /usr/bin/dpkgd"
1⤵
PID:1581

/bin/mkdir
mkdir -p /usr/bin/dpkgd
2⤵
- Reads runtime system information
PID:1582

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1584

/usr/bin/.sshd
/usr/bin/.sshd
2⤵
- Executes dropped EXE
PID:1585

/bin/sh
sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
1⤵
PID:1586

/bin/cp
cp -f /bin/ps /usr/bin/dpkgd/ps
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1587

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1588

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1589

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1590

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1591

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1592

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ps
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1593

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1594

/bin/chmod
chmod 0755 /bin/ps
2⤵
PID:1595

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1596

/bin/cp
cp -f /bin/ss /usr/bin/dpkgd/ss
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1597

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1598

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1599

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1600

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1601

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1602

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ss
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1603

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1604

/bin/chmod
chmod 0755 /bin/ss
2⤵
PID:1605

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1606

/bin/cp
cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1607

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1608

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1609

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1610

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1611

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /usr/bin/lsof"
1⤵
PID:1612

/bin/cp
cp -f /usr/bin/bsd-port/getty /usr/bin/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1613

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1614

/bin/chmod
chmod 0755 /usr/bin/lsof
2⤵
PID:1615

/bin/sh
sh -c "insmod /usr/bin/bsd-port/xpacket.ko"
1⤵
PID:1618

/sbin/insmod
insmod /usr/bin/bsd-port/xpacket.ko
2⤵
- Reads runtime system information
PID:1619

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1621

/sbin/insmod
insmod /tmp/xpacket.ko
2⤵
- Reads runtime system information
PID:1622

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
50B

MD5
3ab122b7b57d47785a0d8b00afe3fe8a

SHA1
dbfdc3e595fd5105c94b11e057a6fbfc7c0a2094

SHA256
1349cfd4236f61c50b2ef25466bafe3d97f4eee8353e4d0f124279b40eac400f

SHA512
8793cd2d3d53da73ed9009c4b12c19a754dd8c6ce1c1ea828493b73ce22d75e29544a4f24eb7d49882cad07b3faa4f92ed878010fe8d3618ae5c5bf9f333c9e4

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

MD5
993cc15058142d96c3daf7852c3d5ee8

SHA1
0950b8b391b04dd3895ea33cd3141543ebd2525d

SHA256
8171d077918611803d93088409f220c66fae1c670b297e1aa5d8cbd548ce9208

SHA512
0c4256c00a3710f97e92581b552682b36b62afc35fe72622c491323c618c19ea62611ac04ccafc3dfcde2254a2ebbd93b69b66795b16e36332293bed83adb928

Download Submit
/tmp/gates.lod
Filesize
4B

MD5
cb8acb1dc9821bf74e6ca9068032d623

SHA1
0ad54e429b2b6238550f24701541130b978e4640

SHA256
8ff9538e65e6781d654b811f88161d12455935ffb8f470815063b6ab6cb7fdff

SHA512
355051ba1d636582e623824587c9d5c6e6cc4c98dc830c26b212d61d0d009b91ad062aa99c7c2a3982a3b34091c49e412d7bfaf6d57c80794e7b3c31801dd964

Download Submit
/tmp/moni.lod
Filesize
4B

MD5
962e56a8a0b0420d87272a682bfd1e53

SHA1
c1766016f621182564fa46f30bac4a76247a6f27

SHA256
ee09198e46224875cf39928511ef2b855895c43ee86d1de894ee82bc7c990afa

SHA512
8847b20c5514c978a6e03b86fdc47c2e8ece8f2de93619cc77555550543cf4db452e21df1c04ac3dee51fd5c83dec2bba6f60a8a559b3dcc6d2a0e5cddb2b689

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/tmp/notify.file
Filesize
37B

MD5
a15ef43522877051247ced8fa3ce6596

SHA1
0dc7a1d2e72abe4e93d310b110c208bf1fb89c1d

SHA256
da1a363a69108ae3b15a02bc7a97d2693a6aeb4ea24fec2923f859f5d75d15a9

SHA512
a18fb94e66e330da6974be808cd641c82d007816811c7b09ecee3174bea4d58dc0c84611bddc272b595c3fe7093cd7734288a2b13f25d8eb36b136e7e4c8d2df

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

MD5
9377c366fd7f87270414a73b0d3ac8aa

SHA1
cecc9d46426184a6c09609261882c1f2c842887a

SHA256
3830e4df2c7df94afeac2f7ed1f4bb05ccceb1f7dea6cd26e7da1295451eedbb

SHA512
2436b1c311b5f41dfb2d1d8e96be7c1d5569b8db3f051c53085ad6aa5ba3595ce04e42a7c38eedacc1c81f2e6cc8153ed519c576e53e1b55fc7c44a510b2c331

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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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