mrblack | fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4

Analysis

max time kernel
146s
max time network
153s
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
23-03-2024 02:38

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General

Target

fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf
Size

1.2MB
MD5

9c65f61859b4b8ae00c79ddd63abf60d
SHA1

ddf2c1d0abdef832ec746004dcdfd0cd800048ae
SHA256

fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4
SHA512

ed39ef838a9cdff65e891f65a98800ebd282645e13d9f83a6b620e3bc573a3fae8e5f312136b970977a4cdbdf5a0e600be401cf425a2d673d30c715562ab163e
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX4a2y1q2rJp0:745vRVJKGtSA0VWeoZu9p0

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

resource	yara_rule
behavioral1/files/fstream-4.dat	family_mrblack

Executes dropped EXE 2 IoCs

ioc	pid	Process
/usr/bin/bsd-port/getty	1583	getty
/usr/bin/.sshd	1599	.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

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

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

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

Write file to user bin folder 1 TTPs 9 IoCs

Hijack Execution Flow

T1574

description	ioc	Process
File opened for modification	/usr/bin/bsd-port/getty.lock	Process not Found
File opened for modification	/usr/bin/bsd-port/udevd.lock	Process not Found
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/lsof	cp
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/bsd-port/conf.n	Process not Found

Writes file to system bin folder 1 TTPs 2 IoCs

Hijack Execution Flow

T1574

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

Reads system network configuration 1 TTPs 3 IoCs

Uses contents of /proc filesystem to enumerate network settings.

System Network Configuration Discovery

T1016

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.

description	ioc	Process
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/stat	Process not Found
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	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/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	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/meminfo	Process not Found
File opened for reading	/proc/filesystems	mkdir

Writes file to tmp directory 5 IoCs

Malware often drops required files in the /tmp directory.

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

/tmp/fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf
/tmp/fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf
1⤵
PID:1559

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1565
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
  2⤵
  PID:1566

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt"
1⤵
PID:1567
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt
  2⤵
  PID:1568

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt"
1⤵
PID:1569
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt
  2⤵
  PID:1570

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt"
1⤵
PID:1571
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt
  2⤵
  PID:1572

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt"
1⤵
PID:1573
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
  2⤵
  PID:1574

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1575
- /bin/mkdir
  mkdir -p /usr/bin/bsd-port
  2⤵
  - Reads runtime system information
  PID:1576

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1577
- /bin/mkdir
  mkdir -p /usr/bin/bsd-port
  2⤵
  - Reads runtime system information
  PID:1578

/bin/sh
sh -c "cp -f /tmp/fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf /usr/bin/bsd-port/getty"
1⤵
PID:1579
- /bin/cp
  cp -f /tmp/fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf /usr/bin/bsd-port/getty
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1580

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1582
- /usr/bin/bsd-port/getty
  /usr/bin/bsd-port/getty
  2⤵
  - Executes dropped EXE
  PID:1583

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1585
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1586

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1587
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1588

/bin/sh
sh -c "cp -f /tmp/fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf /usr/bin/.sshd"
1⤵
PID:1589
- /bin/cp
  cp -f /tmp/fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4.elf /usr/bin/.sshd
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1590

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1591
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
  2⤵
  PID:1592

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1593
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
  2⤵
  PID:1594

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1595
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
  2⤵
  PID:1596

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1598
- /usr/bin/.sshd
  /usr/bin/.sshd
  2⤵
  - Executes dropped EXE
  PID:1599

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1600
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
  2⤵
  PID:1601

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1602
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
  2⤵
  PID:1603

/bin/sh
sh -c "mkdir -p /usr/bin/dpkgd"
1⤵
PID:1604
- /bin/mkdir
  mkdir -p /usr/bin/dpkgd
  2⤵
  - Reads runtime system information
  PID:1605

/bin/sh
sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
1⤵
PID:1606
- /bin/cp
  cp -f /bin/ps /usr/bin/dpkgd/ps
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1607

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1608
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1609

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1610
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1611

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1612
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /bin/ps
  2⤵
  - Writes file to system bin folder
  - Reads runtime system information
  PID:1613

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1614
- /bin/chmod
  chmod 0755 /bin/ps
  2⤵
  PID:1615

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1616
- /bin/cp
  cp -f /bin/ss /usr/bin/dpkgd/ss
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1617

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1618
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1619

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1620
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1621

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1622
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /bin/ss
  2⤵
  - Writes file to system bin folder
  - Reads runtime system information
  PID:1623

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1624
- /bin/chmod
  chmod 0755 /bin/ss
  2⤵
  PID:1625

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1626
- /bin/cp
  cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1627

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1628
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1629

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1630
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1631

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /usr/bin/lsof"
1⤵
PID:1632
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /usr/bin/lsof
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1633

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1634
- /bin/chmod
  chmod 0755 /usr/bin/lsof
  2⤵
  PID:1635

/bin/sh
sh -c "insmod /usr/bin/bsd-port/xpacket.ko"
1⤵
PID:1638
- /sbin/insmod
  insmod /usr/bin/bsd-port/xpacket.ko
  2⤵
  - Reads runtime system information
  PID:1639

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1649
- /sbin/insmod
  insmod /tmp/xpacket.ko
  2⤵
  - Reads runtime system information
  PID:1650

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

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Downloads

/etc/init.d/DbSecuritySpt

Filesize
86B

MD5
6e66ffc5f7f51102becb5b87898c881f

SHA1
b1e46e32d34936f895aad0f47e97bc8a2aacf4bc

SHA256
f8e3164ce0e3ee2be4125269072aba42dd2aa71da0ac463b062fb79fad1eeaa8

SHA512
5e1b5630a6a634918c84107afa1342e3ce14338d3e0d37453d1408b37902e4d2797d4af0814179fdc17177267bc5eaf5488335f3cdfeef7be44635d938ee996f

Download Submit
/etc/init.d/selinux

Filesize
36B

MD5
993cc15058142d96c3daf7852c3d5ee8

SHA1
0950b8b391b04dd3895ea33cd3141543ebd2525d

SHA256
8171d077918611803d93088409f220c66fae1c670b297e1aa5d8cbd548ce9208

SHA512
0c4256c00a3710f97e92581b552682b36b62afc35fe72622c491323c618c19ea62611ac04ccafc3dfcde2254a2ebbd93b69b66795b16e36332293bed83adb928

Download Submit
/tmp/gates.lod

Filesize
4B

MD5
3a20f62a0af1aa152670bab3c602feed

SHA1
062dd0f773cd5999a09714a371e1f8017163e2a1

SHA256
c649b15e769148e6b199b7a671140d60c77847fce6fe17277723dc91f0b27d4c

SHA512
419f66b1afde60779300c3cb662c238c1bfad252c9db934512fa5af99f598c27dffdb1b3514fc254dc947a0080a0484a84ff12ed9aae5ca491091fec39989b86

Download Submit
/tmp/moni.lod

Filesize
4B

MD5
1c54985e4f95b7819ca0357c0cb9a09f

SHA1
85d0662ad5825ba33f4259d0d06ac035abac67bf

SHA256
245db7164aace830256c713e17486f1785096c86049d6409349fff5f810da253

SHA512
f24fb250d43bbe3ef3f28dfb1c6f8f553540c0d43023a88a718e2d38db9a18eac926cf44bcc3f1840cc8a29b2bdfec41dd0527abdc77aecde0e165742319a232

Download Submit
/tmp/notify.file

Filesize
73B

MD5
aa5a037c067beacea61245aee3e85606

SHA1
49e3379bb8f615a63b888fc1844c869e5d4ab594

SHA256
526eff9a2c0c2b1ff0d05630d79ba0365586e6af830279396709fb413e589641

SHA512
995302503a93c3474151bf8154526456c6ea44f5c9b3a98647c1060aa9e4df8fe78cb458899c2f9f37284bcc2638a58890c96424a83655b44ccad61e1ccf942e

Download Submit
/usr/bin/bsd-port/conf.n

Filesize
73B

MD5
6cd455165a6413ec7cf19488ca44838a

SHA1
d5810f05839689c2e35fbf16dc6a3030c9ac4a2e

SHA256
8daee42374a208a89fbb370e08b46a2f85d67e07c01d1e5dac6f22deaaf29bcf

SHA512
a9f83b845a15cbd5078555e07943b56bcd7e66dcb78d95b952b82b7fcefbbef036359dfc90d88e61e64308937ca5d747ac31b5fb8f3bd5904444ae2f4868003a

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/usr/bin/bsd-port/getty

Filesize
1.2MB

MD5
9c65f61859b4b8ae00c79ddd63abf60d

SHA1
ddf2c1d0abdef832ec746004dcdfd0cd800048ae

SHA256
fab8944e3f0541c0ff149306ea74137f7c1e9c081670906844769a45aa7171b4

SHA512
ed39ef838a9cdff65e891f65a98800ebd282645e13d9f83a6b620e3bc573a3fae8e5f312136b970977a4cdbdf5a0e600be401cf425a2d673d30c715562ab163e

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/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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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads