mrblack | 4d595569112b09d25f8b2219d1630af1b9ef5ddefd2c8aea31f15ac7ad5798b1

Analysis

max time kernel
149s
max time network
150s
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
21-02-2024 04:32

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General

Target

036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf
Size

1.2MB
MD5

cb084b73d800c005e5a3cf4f299f032a
SHA1

770fca135b25594e77480cdca7116366be2ba91d
SHA256

036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796
SHA512

1b7476baa62f8388f933e2e15473bca928abf0d1128d551ca21a8d1b6615b04f2660f77bcf406df939d31c9916d42900a5c3dec50ebfa40ce1340ae545e41234
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX4B2y1q2rJp0:745vRVJKGtSA0VWeoYu9p0

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	1557	getty
/usr/bin/.sshd	1587	.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	cp
File opened for modification	/usr/bin/dpkgd/ps	cp
File opened for modification	/usr/bin/lsof	cp
File opened for modification	/usr/bin/bsd-port/conf.n	Process not Found
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/ss	cp
File opened for modification	/usr/bin/dpkgd/lsof	cp

Writes file to system bin folder 1 TTPs 2 IoCs

Hijack Execution Flow

T1574

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

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

Reads runtime system information 23 IoCs

Reads data from /proc virtual filesystem.

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/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/cmdline	insmod
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	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/stat	Process not Found
File opened for reading	/proc/meminfo	Process not Found

Writes file to tmp directory 5 IoCs

Malware often drops required files in the /tmp directory.

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/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf
/tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf
1⤵
PID:1533

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1539
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
  2⤵
  PID:1540

/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:1547
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
  2⤵
  PID:1548

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1549
- /bin/mkdir
  mkdir -p /usr/bin/bsd-port
  2⤵
  - Reads runtime system information
  PID:1550

/bin/sh
sh -c "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1551
- /bin/mkdir
  mkdir -p /usr/bin/bsd-port
  2⤵
  - Reads runtime system information
  PID:1552

/bin/sh
sh -c "cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/bsd-port/getty"
1⤵
PID:1553
- /bin/cp
  cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/bsd-port/getty
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1554

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1556
- /usr/bin/bsd-port/getty
  /usr/bin/bsd-port/getty
  2⤵
  - Executes dropped EXE
  PID:1557

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1559
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1560

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1561
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1562

/bin/sh
sh -c "cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/.sshd"
1⤵
PID:1563
- /bin/cp
  cp -f /tmp/036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796.elf /usr/bin/.sshd
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1564

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1565
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
  2⤵
  PID:1566

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1567
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
  2⤵
  PID:1568

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1569
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
  2⤵
  PID:1570

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1571
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
  2⤵
  PID:1572

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1573
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
  2⤵
  PID:1574

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

/bin/sh
sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
1⤵
PID:1577
- /bin/cp
  cp -f /bin/ps /usr/bin/dpkgd/ps
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1578

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1579
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1580

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1581
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1582

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1583
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /bin/ps
  2⤵
  - Writes file to system bin folder
  - Reads runtime system information
  PID:1584

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1586
- /usr/bin/.sshd
  /usr/bin/.sshd
  2⤵
  - Executes dropped EXE
  PID:1587

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1588
- /bin/chmod
  chmod 0755 /bin/ps
  2⤵
  PID:1589

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1590
- /bin/cp
  cp -f /bin/ss /usr/bin/dpkgd/ss
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1591

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1592
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1593

/bin/sh
sh -c "mkdir -p /bin"
1⤵
PID:1594
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1595

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1596
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /bin/ss
  2⤵
  - Writes file to system bin folder
  - Reads runtime system information
  PID:1597

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1598
- /bin/chmod
  chmod 0755 /bin/ss
  2⤵
  PID:1599

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1600
- /bin/cp
  cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1601

/bin/sh
sh -c "mkdir -p /usr/bin"
1⤵
PID:1602
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1603

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

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

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1608
- /bin/chmod
  chmod 0755 /usr/bin/lsof
  2⤵
  PID:1609

/bin/sh
sh -c "insmod /usr/bin/bsd-port/xpacket.ko"
1⤵
PID:1612
- /sbin/insmod
  insmod /usr/bin/bsd-port/xpacket.ko
  2⤵
  - Reads runtime system information
  PID:1613

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1620
- /sbin/insmod
  insmod /tmp/xpacket.ko
  2⤵
  - Reads runtime system information
  PID:1621

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
439913205f47f0bb746f717431038aeb

SHA1
42953da470acce1bbdf27536ed4b5bab202e6c46

SHA256
bd9c6d83a45470bacb5264bf623ff96d1e9752e58c737bc567c81c5cdafd78e0

SHA512
d9996008f5a534fe0fc1dc9536710aec0e2b3de5cf8ec94c9439086a8e6580623de6d40183520d2d2dfb6582e4c72a352e1024d94e64d2f3b191e1855e50c00c

Download Submit
/etc/init.d/selinux

Filesize
36B

MD5
993cc15058142d96c3daf7852c3d5ee8

SHA1
0950b8b391b04dd3895ea33cd3141543ebd2525d

SHA256
8171d077918611803d93088409f220c66fae1c670b297e1aa5d8cbd548ce9208

SHA512
0c4256c00a3710f97e92581b552682b36b62afc35fe72622c491323c618c19ea62611ac04ccafc3dfcde2254a2ebbd93b69b66795b16e36332293bed83adb928

Download Submit
/tmp/gates.lod

Filesize
4B

MD5
d63fbf8c3173730f82b150c5ef38b8ff

SHA1
1d23c8edf135106a57d7f1694d9c2c7eb67cc326

SHA256
13be5b896be039957e7996f606c8513fa2d9061132bdcabdbee5a362dd9fd8ff

SHA512
275c9875be2b60cc2d67678f6c08b9bfb4f21f8f087eaa942aad8d808f2141a9d1b376e1825ab764f8eda46cc7f6a86490d8475ca8446a6ef519c71784fdc11a

Download Submit
/tmp/moni.lod

Filesize
4B

MD5
a14ac55a4f27472c5d894ec1c3c743d2

SHA1
65ccba0dc0797b93da4d0d0544d00cfcb8d54c4d

SHA256
31d8edb99534fd4800651db4d241d86e0380fa7376718b88590c2d772b41d5f4

SHA512
f7315a536fa0d5684625b33ec202aa7fdd89ed86b4f723e80d3dd89f5975e4d96c85ee549c62a17679afbbc8fcafa1e86cfae567c1e29660fbf28405eed914a7

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/tmp/notify.file

Filesize
73B

MD5
bc01940555c09662cec74116e974b2ce

SHA1
b257d533ba95e2db7bdbbb760bee19bb7817eed6

SHA256
54565be026e653ed9525b423f6346a83b4f5b65173715e6826cfc88a15bcb9db

SHA512
35a4d144f0ad23ba861067f4639a66166ad7dcf6dcf867c4e3aaf643e9308789310454e596b9b6c3e6ac6329f9187b26d87fa0c77d2c4d50ba6fd2f0a8c4f6ff

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

Filesize
73B

MD5
3d09c7ee04220846816ef4af5650b064

SHA1
1c5059ca5a7d9d723642ae68ef2ee4b82b6f5f41

SHA256
d2ee533cc5a2193b674dd946062131069d83beb80b8f3c758099ed5246c2b1c9

SHA512
cbe8e7e5fdbce55889c80ce32bb9ccc390b92519eb17f1abe0a267f48f9866c84617fbd6ce8dc011a50189877fc50a406c9308cc834b282cbba0fe65b0d22c96

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/usr/bin/bsd-port/getty

Filesize
1.2MB

MD5
cb084b73d800c005e5a3cf4f299f032a

SHA1
770fca135b25594e77480cdca7116366be2ba91d

SHA256
036a2f04ab56b5e7098c7d866eb21307011b812f126793159be1c853a6a54796

SHA512
1b7476baa62f8388f933e2e15473bca928abf0d1128d551ca21a8d1b6615b04f2660f77bcf406df939d31c9916d42900a5c3dec50ebfa40ce1340ae545e41234

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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