mrblack | cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4

Analysis

max time kernel
149s
max time network
153s
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
20-02-2024 06:01

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General

Target

cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf
Size

1.2MB
MD5

abc66fbc294358fb5ca8c4dd2f3e42cf
SHA1

a89a5999f2f6c37e1316f748767113b9b211cb3e
SHA256

cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4
SHA512

ac1e4b3e8190625e5a54ae078081b61e39f717c22392441f67590167f015598ba36c4a186889d715ca52cd727d2e140e98504bc70c203718e754a20e4c90f5af
SSDEEP

24576:e845rGHu6gVJKG75oFpA0VWeX4g2y1q2rJp0:745vRVJKGtSA0VWeoXu9p0

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 2 IoCs

resource	yara_rule
behavioral1/files/fstream-4.dat	family_mrblack
behavioral1/files/fstream-6.dat	family_mrblack

Executes dropped EXE 2 IoCs

ioc	pid	Process
/usr/bin/bsd-port/getty	1565	getty
/usr/bin/.sshd	1589	.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/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
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/getty	cp
File opened for modification	/usr/bin/dpkgd/ps	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/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	mkdir
File opened for reading	/proc/meminfo	Process not Found
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/stat	Process not Found
File opened for reading	/proc/cmdline	insmod
File opened for reading	/proc/filesystems	cp
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	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	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	cp

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/cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf
/tmp/cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf
1⤵
PID:1532

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt"
1⤵
PID:1547
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc1.d/S97DbSecuritySpt
  2⤵
  PID:1548

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt"
1⤵
PID:1549
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc2.d/S97DbSecuritySpt
  2⤵
  PID:1550

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt"
1⤵
PID:1551
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc3.d/S97DbSecuritySpt
  2⤵
  PID:1552

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt"
1⤵
PID:1553
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc4.d/S97DbSecuritySpt
  2⤵
  PID:1554

/bin/sh
sh -c "ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt"
1⤵
PID:1555
- /bin/ln
  ln -s /etc/init.d/DbSecuritySpt /etc/rc5.d/S97DbSecuritySpt
  2⤵
  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 "mkdir -p /usr/bin/bsd-port"
1⤵
PID:1559
- /bin/mkdir
  mkdir -p /usr/bin/bsd-port
  2⤵
  - Reads runtime system information
  PID:1560

/bin/sh
sh -c "cp -f /tmp/cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf /usr/bin/bsd-port/getty"
1⤵
PID:1561
- /bin/cp
  cp -f /tmp/cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf /usr/bin/bsd-port/getty
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1562

/bin/sh
sh -c /usr/bin/bsd-port/getty
1⤵
PID:1564
- /usr/bin/bsd-port/getty
  /usr/bin/bsd-port/getty
  2⤵
  - Executes dropped EXE
  PID:1565

/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 "mkdir -p /usr/bin"
1⤵
PID:1569
- /bin/mkdir
  mkdir -p /usr/bin
  2⤵
  - Reads runtime system information
  PID:1570

/bin/sh
sh -c "cp -f /tmp/cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf /usr/bin/.sshd"
1⤵
PID:1571
- /bin/cp
  cp -f /tmp/cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4.elf /usr/bin/.sshd
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1572

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
1⤵
PID:1573
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
  2⤵
  PID:1574

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
1⤵
PID:1575
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
  2⤵
  PID:1576

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
1⤵
PID:1577
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
  2⤵
  PID:1578

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
1⤵
PID:1579
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
  2⤵
  PID:1580

/bin/sh
sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
1⤵
PID:1581
- /bin/ln
  ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
  2⤵
  PID:1582

/bin/sh
sh -c "mkdir -p /usr/bin/dpkgd"
1⤵
PID:1583
- /bin/mkdir
  mkdir -p /usr/bin/dpkgd
  2⤵
  - Reads runtime system information
  PID:1584

/bin/sh
sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
1⤵
PID:1585
- /bin/cp
  cp -f /bin/ps /usr/bin/dpkgd/ps
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1586

/bin/sh
sh -c /usr/bin/.sshd
1⤵
PID:1588
- /usr/bin/.sshd
  /usr/bin/.sshd
  2⤵
  - Executes dropped EXE
  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 "mkdir -p /bin"
1⤵
PID:1592
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1593

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ps"
1⤵
PID:1594
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /bin/ps
  2⤵
  - Writes file to system bin folder
  - Reads runtime system information
  PID:1595

/bin/sh
sh -c "chmod 0755 /bin/ps"
1⤵
PID:1596
- /bin/chmod
  chmod 0755 /bin/ps
  2⤵
  PID:1597

/bin/sh
sh -c "cp -f /bin/ss /usr/bin/dpkgd/ss"
1⤵
PID:1598
- /bin/cp
  cp -f /bin/ss /usr/bin/dpkgd/ss
  2⤵
  - Write file to user bin folder
  - 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 "mkdir -p /bin"
1⤵
PID:1602
- /bin/mkdir
  mkdir -p /bin
  2⤵
  - Reads runtime system information
  PID:1603

/bin/sh
sh -c "cp -f /usr/bin/bsd-port/getty /bin/ss"
1⤵
PID:1604
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /bin/ss
  2⤵
  - Writes file to system bin folder
  - Reads runtime system information
  PID:1605

/bin/sh
sh -c "chmod 0755 /bin/ss"
1⤵
PID:1606
- /bin/chmod
  chmod 0755 /bin/ss
  2⤵
  PID:1607

/bin/sh
sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
1⤵
PID:1608
- /bin/cp
  cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
  2⤵
  - Write file to user bin folder
  - 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 "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 /usr/bin/bsd-port/getty /usr/bin/lsof"
1⤵
PID:1614
- /bin/cp
  cp -f /usr/bin/bsd-port/getty /usr/bin/lsof
  2⤵
  - Write file to user bin folder
  - Reads runtime system information
  PID:1615

/bin/sh
sh -c "chmod 0755 /usr/bin/lsof"
1⤵
PID:1616
- /bin/chmod
  chmod 0755 /usr/bin/lsof
  2⤵
  PID:1617

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

/bin/sh
sh -c "insmod /tmp/xpacket.ko"
1⤵
PID:1631
- /sbin/insmod
  insmod /tmp/xpacket.ko
  2⤵
  - Reads runtime system information
  PID:1632

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
d94ed9f0c2331b7b2416044082922e6c

SHA1
1f51479495662529bc9879334e1eedd6c475bae0

SHA256
0ae7075efa614156630b1fe267df95c9a8f6fa6a01f9ccea884aa248a1057531

SHA512
4b045284d2dbd5a1709e934beb9ef1a188e65adbe95092fb0f9a65d95d7399bfff8b6bd12b953822c7856e2e7e335d8a21e6b2986e769c8a457453c27d588e8e

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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
b5a1fc2085986034e448d2ccc5bb9703

SHA1
2c8041adcd90153af5180e4c18e22c3b161c25e8

SHA256
b51e45a12fbae3d0ee2bf77f1a4f80cbf642e2b4d1c237d2c0f7053a54f6b388

SHA512
2ac6bc01e772f216c8298153168105655141b62abae70c966f38b03936a56a8c3f6576c556901ebc1ad905b891692a2889fd75b9ee586de28e8f2fe7302dfc14

Download Submit
/tmp/moni.lod

Filesize
4B

MD5
f60bb6bb4c96d4df93c51bd69dcc15a0

SHA1
deccc3d8f76c21f127e400870f9e1ed609090401

SHA256
ae92bee5080ffa3533774ef98ec7858b08a02fed6778ab5d2043d0c64028e2d6

SHA512
db46a2c75bf23f8c38f7a9234bdf013d49d6960f7c039f49fa1e1bd4f5315b290523c23b1f9479e6e1bdd1bc3e4152a747af691bb99863b24c534b880aa18af7

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/tmp/notify.file

Filesize
73B

MD5
6814337c8b81c50bda9c7c3150d5f4ac

SHA1
6a3bf958761e37eed49b69763be50404088c34ec

SHA256
418036e0fea2e40251e2502a7f0d470a64814c0fbd7d1e97674f965f04cfc231

SHA512
5474938664de82a02f5ff62ad716c748d1db771730348e45ce3e4d0508d0d9e291f5eca3533beaa7106da9025d4b2bc6287c28832fc4a7ee5bf9c39fb0f85e80

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/usr/bin/.sshd

Filesize
926KB

MD5
78e3ef7341d09b96bc001a199b256ea0

SHA1
a68827054d5a0fb8b2e7e2aa7e3805b0434d795a

SHA256
eec9d7e07297db1523f88073c41fd1b6c39bdffd33c6a05cd9ee9497018ab177

SHA512
75b712af36b71b09dfd28fef225fc087e77f9defa65c4c47af41ba41601be850a9f5cb9eb3bdcbdd24c50669e87b2a4ec30ddae288951e6bfe577e09ac56b4c7

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

Filesize
73B

MD5
d175e6ec9a642a567478bf5ff9b3114d

SHA1
4ab4ec54875dd552546393b5951ab5f3462df9a7

SHA256
d23150c1dcfae67c893d1b4b8cc306c061c17414cf446cdde588e983ca2a5a96

SHA512
a5cb935bcbe395d82c0cc6868ea8a3c5f0e8ed0093a1f5b3e25b86b8a0b2f5996e34d9003545fa7331602b25d98add74b681a2444bab1478858cfe38a10dfd53

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/usr/bin/bsd-port/getty

Filesize
1.2MB

MD5
abc66fbc294358fb5ca8c4dd2f3e42cf

SHA1
a89a5999f2f6c37e1316f748767113b9b211cb3e

SHA256
cfaaf70ca32d5ff133378cc0cfdc0cd5f27d91abf6853404df57208a8a7d3de4

SHA512
ac1e4b3e8190625e5a54ae078081b61e39f717c22392441f67590167f015598ba36c4a186889d715ca52cd727d2e140e98504bc70c203718e754a20e4c90f5af

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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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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads