mrblack | 7fd819ff6a69b045b0d7eb9900987dff73792a68acaa45cb0e2ef9298c5bba54

Analysis

max time kernel
151s
max time network
135s
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
26-12-2023 17:07

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General

Target

7f0c9c24f2bd4145e923fe65bcdfd49c
Size

1.2MB
MD5

7f0c9c24f2bd4145e923fe65bcdfd49c
SHA1

ee482d0f762f102a86bd500c16b2586d3d20795c
SHA256

7fd819ff6a69b045b0d7eb9900987dff73792a68acaa45cb0e2ef9298c5bba54
SHA512

33a3ce0ee73f7ee07cb39955a8c29649578b4e38dbcd9d442dff725b97896bda1ba73bd816955f48c562925345c8790ec976a0b4e5a6cf1f93b2f2e91199b186
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX462y1q2rJp0:745vRVJKGtSA0VWeo5u9p0

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 1608 getty
/usr/bin/.sshd 1630 .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	1608	getty
/usr/bin/.sshd	1630	.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:

cpmkdirmkdircpcpinsmodmkdircpmkdircpmkdirmkdirmkdircpinsmodmkdirmkdirmkdircpmkdircp

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

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/7f0c9c24f2bd4145e923fe65bcdfd49c
/tmp/7f0c9c24f2bd4145e923fe65bcdfd49c
1⤵
PID:1576

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1590

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
2⤵
PID:1591

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt"
1⤵
PID:1592

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt
2⤵
PID:1593

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt"
1⤵
PID:1594

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt
2⤵
PID:1595

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt"
1⤵
PID:1596

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt
2⤵
PID:1597

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt"
1⤵
PID:1598

/bin/ln
ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
2⤵
PID:1599

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

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

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1602

/bin/mkdir
mkdir -p /usr/bin/bsd-port
2⤵
- Reads runtime system information
PID:1603

/bin/sh
sh -c "cp -f /tmp/7f0c9c24f2bd4145e923fe65bcdfd49c /usr/bin/bsd-port/getty"
1⤵
PID:1604

/bin/cp
cp -f /tmp/7f0c9c24f2bd4145e923fe65bcdfd49c /usr/bin/bsd-port/getty
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1605

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1607

/usr/bin/bsd-port/getty
/usr/bin/bsd-port/getty
2⤵
- Executes dropped EXE
PID:1608

/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 "mkdir -p /usr/bin"
1⤵
PID:1612

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

/bin/sh
sh -c "cp -f /tmp/7f0c9c24f2bd4145e923fe65bcdfd49c /usr/bin/.sshd"
1⤵
PID:1614

/bin/cp
cp -f /tmp/7f0c9c24f2bd4145e923fe65bcdfd49c /usr/bin/.sshd
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1615

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1616

/bin/ln
ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
2⤵
PID:1617

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1618

/bin/ln
ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
2⤵
PID:1619

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1620

/bin/ln
ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
2⤵
PID:1621

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1622

/bin/ln
ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
2⤵
PID:1623

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1624

/bin/ln
ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
2⤵
PID:1625

/bin/sh
sh -c "mkdir -p /usr/bin/dpkgd"
1⤵
PID:1626

/bin/mkdir
mkdir -p /usr/bin/dpkgd
2⤵
- Reads runtime system information
PID:1627

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1629

/usr/bin/.sshd
/usr/bin/.sshd
2⤵
- Executes dropped EXE
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 "mkdir -p /bin"
1⤵
PID:1635

/bin/mkdir
mkdir -p /bin
2⤵
- Reads runtime system information
PID:1636

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1637

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ps
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1638

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1639

/bin/chmod
chmod 0755 /bin/ps
2⤵
PID:1640

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1641

/bin/cp
cp -f /bin/ss /usr/bin/dpkgd/ss
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1642

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1643

/bin/mkdir
mkdir -p /bin
2⤵
- 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 "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1647

/bin/cp
cp -f /usr/bin/bsd-port/getty /bin/ss
2⤵
- Writes file to system bin folder
- Reads runtime system information
PID:1648

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1649

/bin/chmod
chmod 0755 /bin/ss
2⤵
PID:1650

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1651

/bin/cp
cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1652

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1653

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1654

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1655

/bin/mkdir
mkdir -p /usr/bin
2⤵
- Reads runtime system information
PID:1656

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /usr/bin/lsof"
1⤵
PID:1657

/bin/cp
cp -f /usr/bin/bsd-port/getty /usr/bin/lsof
2⤵
- Write file to user bin folder
- Reads runtime system information
PID:1658

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1659

/bin/chmod
chmod 0755 /usr/bin/lsof
2⤵
PID:1660

/bin/sh
sh -c "insmod /usr/bin/bsd-port/xpacket.ko"
1⤵
PID:1663

/sbin/insmod
insmod /usr/bin/bsd-port/xpacket.ko
2⤵
- Reads runtime system information
PID:1664

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1666

/sbin/insmod
insmod /tmp/xpacket.ko
2⤵
- Reads runtime system information
PID:1667

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
ae8f32712d7c1a2e7764ea5ff6558743

SHA1
180f1d192073e9666316660a54e86a5c0c077ff1

SHA256
5075f90b9cd82dbe868164b4b01805510a986a23a8132516fcac6f48e4d50a7c

SHA512
19198a18a1af98ad38b1f3d1415918344284a740bc42b39ea91fc82fb7640e1f36d725fd4bfc11bddb6d49863d2ef702ebc13150b24437b2ce75abef2b3159d6

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/etc/init.d/selinux
Filesize
36B

MD5
993cc15058142d96c3daf7852c3d5ee8

SHA1
0950b8b391b04dd3895ea33cd3141543ebd2525d

SHA256
8171d077918611803d93088409f220c66fae1c670b297e1aa5d8cbd548ce9208

SHA512
0c4256c00a3710f97e92581b552682b36b62afc35fe72622c491323c618c19ea62611ac04ccafc3dfcde2254a2ebbd93b69b66795b16e36332293bed83adb928

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/tmp/gates.lod
Filesize
4B

MD5
7e1d842d0f7ee600116ffc6b2d87d83f

SHA1
58cb004c78ad7dd27552600c7c1d525e5797cd1d

SHA256
1d16bb3354a11b509e641db094ca078be290298b0ec32c6b46b88fe919a1a8ed

SHA512
113c6380957062e07ff7390ef365b7352fa3e96dabb6503422821a7de921d40296db514ff99bf85f780aee8486787810184d16106a8a7ccdc92423e23bf31575

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/tmp/moni.lod
Filesize
4B

MD5
7d12b66d3df6af8d429c1a357d8b9e1a

SHA1
5c5a56a1d11d0a2e27797f751519fa1fdaa28e16

SHA256
8429476daf79869660e1228853868ae86ae9ec97893d38ae2be5ac85618d9082

SHA512
c877003735c8ad7e442384f40584d4d42b317d4f3e2c0d17d50ac82b4061966995c306c411b5fbb74cb6a0373b1493d3f3bafa4e85ce35a1921d028a4bd322c4

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/tmp/notify.file
Filesize
37B

MD5
76b38b7b44d81c861c723be729a31423

SHA1
1ce0c29fa01b1e8420a5d625d72fae3906f35411

SHA256
1e534188847c57384c26d7c5b1e28b680ed3ade584c3c221b63344643716ef5c

SHA512
468bb95f013396bc5fe33c6e881ec6eeecda62334259956c53b152e2e5e7b882d07559d21a3cba5c2a5a6bc584481d9d19810d35036d1aaebabc34c22f32e3af

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

MD5
7f0c9c24f2bd4145e923fe65bcdfd49c

SHA1
ee482d0f762f102a86bd500c16b2586d3d20795c

SHA256
7fd819ff6a69b045b0d7eb9900987dff73792a68acaa45cb0e2ef9298c5bba54

SHA512
33a3ce0ee73f7ee07cb39955a8c29649578b4e38dbcd9d442dff725b97896bda1ba73bd816955f48c562925345c8790ec976a0b4e5a6cf1f93b2f2e91199b186

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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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