mrblack | 6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23

Analysis

max time kernel
149s
max time network
150s
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
05-05-2024 19:46

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General

Target

6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
Size

1.1MB
MD5

7d1343b3ab670b162fb2ce8854f01167
SHA1

de95e608dd0e97d5eca90b6b6d747465980d4857
SHA256

6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23
SHA512

22ff942fcaabe8a63919a53bf68642dd45943ef3c24e558b18d51ca5c4c0209be653ec268f9d0f64b5634e9dd3e32f7eacdb746fd2263907c0f8f33d89dd91be
SSDEEP

24576:4vRE7caCfKGPqVEDNLFxKsfawI+gIGYuuCol7r:4vREKfPqVE5jKsfawRHGVo7r

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/knerl	1570	knerl
/usr/bin/pythno	1590	pythno

Modifies init.d 1 TTPs 2 IoCs

Adds/modifies system service, likely for persistence.

persistence

Boot or Logon Autostart Execution

T1547

description	ioc	Process
File opened for modification	/etc/init.d/VsystemsshMdt	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/etc/init.d/selinux	knerl

Reads system routing table 1 TTPs 1 IoCs

Gets active network interfaces from /proc virtual filesystem.

System Network Configuration Discovery

T1016

description	ioc	Process
File opened for reading	/proc/net/route	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf

Write file to user bin folder 1 TTPs 8 IoCs

Hijack Execution Flow

T1574

description	ioc	Process
File opened for modification	/usr/bin/pythno	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/knerl.conf	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/usr/bin/bsd-port/udevd.conf	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/usr/bin/bsd-port/knerl	cp
File opened for modification	/usr/bin/bsd-port/knerl.conf	knerl

Writes file to system bin folder 1 TTPs 1 IoCs

Hijack Execution Flow

T1574

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

Checks CPU configuration 1 TTPs 2 IoCs

Checks CPU information which indicate if the system is a virtual machine.

antivm

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
File opened for reading	/proc/cpuinfo	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for reading	/proc/cpuinfo	knerl

Reads system network configuration 1 TTPs 4 IoCs

Uses contents of /proc filesystem to enumerate network settings.

System Network Configuration Discovery

T1016

description	ioc	Process
File opened for reading	/proc/net/dev	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for reading	/proc/net/dev	knerl
File opened for reading	/proc/net/route	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for reading	/proc/net/arp	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf

Reads runtime system information 17 IoCs

Reads data from /proc virtual filesystem.

description	ioc	Process
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	cp
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/stat	knerl
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/meminfo	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/stat	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
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/meminfo	knerl

Writes file to tmp directory 8 IoCs

Malware often drops required files in the /tmp directory.

description	ioc	Process
File opened for modification	/tmp/idus.log	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/tmp/apsh.conf	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/tmp/vga.conf	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/tmp/notify.file	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/tmp/conf.n	6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
File opened for modification	/tmp/idus.log	pythno
File opened for modification	/tmp/notify.file	pythno
File opened for modification	/tmp/vga.conf	pythno

/tmp/6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
/tmp/6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf
1⤵
- Modifies init.d
- Reads system routing table
- Write file to user bin folder
- Checks CPU configuration
- Reads system network configuration
- Reads runtime system information
- Writes file to tmp directory
PID:1548
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc1.d/S97VsystemsshMdt"
  2⤵
  PID:1554
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc1.d/S97VsystemsshMdt
    3⤵
    PID:1555
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc2.d/S97VsystemsshMdt"
  2⤵
  PID:1556
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc2.d/S97VsystemsshMdt
    3⤵
    PID:1557
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc3.d/S97VsystemsshMdt"
  2⤵
  PID:1558
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc3.d/S97VsystemsshMdt
    3⤵
    PID:1559
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc4.d/S97VsystemsshMdt"
  2⤵
  PID:1560
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc4.d/S97VsystemsshMdt
    3⤵
    PID:1561
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc5.d/S97VsystemsshMdt"
  2⤵
  PID:1562
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc5.d/S97VsystemsshMdt
    3⤵
    PID:1563
- /bin/sh
  sh -c "mkdir -p /usr/bin/bsd-port"
  2⤵
  PID:1564
- - /bin/mkdir
    mkdir -p /usr/bin/bsd-port
    3⤵
    - Reads runtime system information
    PID:1565
- /bin/sh
  sh -c "cp -f /tmp/6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf /usr/bin/bsd-port/knerl"
  2⤵
  PID:1566
- - /bin/cp
    cp -f /tmp/6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf /usr/bin/bsd-port/knerl
    3⤵
    - Write file to user bin folder
    - Reads runtime system information
    PID:1567
- /bin/sh
  sh -c /usr/bin/bsd-port/knerl
  2⤵
  PID:1569
- - /usr/bin/bsd-port/knerl
    /usr/bin/bsd-port/knerl
    3⤵
    - Executes dropped EXE
    - Modifies init.d
    - Write file to user bin folder
    - Checks CPU configuration
    - Reads system network configuration
    - Reads runtime system information
    PID:1570
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
      4⤵
      PID:1576
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
        5⤵
        
        PID:1577
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
      4⤵
      PID:1578
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
        5⤵
        
        PID:1579
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
      4⤵
      PID:1580
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
        5⤵
        
        PID:1581
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
      4⤵
      PID:1582
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
        5⤵
        
        PID:1583
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
      4⤵
      PID:1584
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
        5⤵
        
        PID:1585
  - - /bin/sh
      sh -c "mkdir -p /usr/bin/dpkgd"
      4⤵
      PID:1586
    - - /bin/mkdir
        
        mkdir -p /usr/bin/dpkgd
        5⤵
        Reads runtime system information
        
        PID:1587
  - - /bin/sh
      sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
      4⤵
      PID:1594
    - - /bin/cp
        
        cp -f /bin/ps /usr/bin/dpkgd/ps
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1595
  - - /bin/sh
      sh -c "mkdir -p /bin"
      4⤵
      PID:1597
    - - /bin/mkdir
        
        mkdir -p /bin
        5⤵
        Reads runtime system information
        
        PID:1598
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/knerl /bin/ps"
      4⤵
      PID:1599
    - - /bin/cp
        
        cp -f /usr/bin/bsd-port/knerl /bin/ps
        5⤵
        Writes file to system bin folder
        Reads runtime system information
        
        PID:1600
  - - /bin/sh
      sh -c "chmod 0755 /bin/ps"
      4⤵
      PID:1602
    - - /bin/chmod
        
        chmod 0755 /bin/ps
        5⤵
        
        PID:1603
  - - /bin/sh
      sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
      4⤵
      PID:1604
    - - /bin/cp
        
        cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1605
  - - /bin/sh
      sh -c "mkdir -p /usr/bin"
      4⤵
      PID:1607
    - - /bin/mkdir
        
        mkdir -p /usr/bin
        5⤵
        Reads runtime system information
        
        PID:1608
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/knerl /usr/bin/lsof"
      4⤵
      PID:1609
    - - /bin/cp
        
        cp -f /usr/bin/bsd-port/knerl /usr/bin/lsof
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1610
  - - /bin/sh
      sh -c "chmod 0755 /usr/bin/lsof"
      4⤵
      PID:1611
    - - /bin/chmod
        
        chmod 0755 /usr/bin/lsof
        5⤵
        
        PID:1612
  - - /bin/sh
      sh -c "insmod /usr/lib/xpacket.ko"
      4⤵
      PID:1614
    - - /sbin/insmod
        
        insmod /usr/lib/xpacket.ko
        5⤵
        Reads runtime system information
        
        PID:1615
- /bin/sh
  sh -c "mkdir -p /usr/bin"
  2⤵
  PID:1572
- - /bin/mkdir
    mkdir -p /usr/bin
    3⤵
    - Reads runtime system information
    PID:1573
- /bin/sh
  sh -c "cp -f /tmp/6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf /usr/bin/pythno"
  2⤵
  PID:1574
- - /bin/cp
    cp -f /tmp/6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23.elf /usr/bin/pythno
    3⤵
    - Write file to user bin folder
    - Reads runtime system information
    PID:1575
- /bin/sh
  sh -c /usr/bin/pythno
  2⤵
  PID:1589
- - /usr/bin/pythno
    /usr/bin/pythno
    3⤵
    - Executes dropped EXE
    - Writes file to tmp directory
    PID:1590
- /bin/sh
  sh -c "insmod /usr/lib/xpacket.ko"
  2⤵
  PID:1592
- - /sbin/insmod
    insmod /usr/lib/xpacket.ko
    3⤵
    - Reads runtime system information
    PID:1593

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/VsystemsshMdt

Filesize
86B

MD5
62c50665d16111fd2bd429aee5e844c4

SHA1
a20470136573862ad0b81e68d092466cf76f40a6

SHA256
81561480ccebeb470642451dbf9e602dd0bc5e6819c1becf3f088e3816149e5b

SHA512
afbc70357c51fbc720ee93ae18f301cbcde8eb401618b5371f39e485f733176378f174d8252df39f3b03d2fdd81ca3ae9ddd974f47eb70d07a1d42b8cf4ed36b

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/etc/init.d/selinux

Filesize
36B

MD5
caa27b819c9303446f702929874a00e8

SHA1
d24199c0e376edea3f822b215148cc0dc78364bf

SHA256
da9b535a14c6d9152857e211f14fb8da9056e84ba1b8d4dc27ab79c98264050b

SHA512
dcd9413eb2cb24d77f637edfc00ca0bb42229a1a3b0d84e29eff94a7b91aee6ee8c126c286a4b4103e01834d1c6aec9de09ffab3927e8de8015421005f31446e

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/tmp/idus.log

Filesize
4B

MD5
5129a5ddcd0dcd755232baa04c231698

SHA1
b2a3625de074749ed626d2c2fdf5342d7757a850

SHA256
e52522a505f68250e81747aa5386c5c60196c1680f1c89762ab1ab0fbaae39b8

SHA512
27f36a56ba7f81569a7edcada4b457648cef41168a85cadf11c6e649295b110569e060047c624376a3dd8372edf153ae15c954cce7e308e8f826884a707d12c9

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/tmp/notify.file

Filesize
73B

MD5
0400ed517c2462909168771fe1319605

SHA1
43fa6a8c8f217caaa72e1a6490d10e1fb5f3c7a2

SHA256
1d1c633b317e28b55004bc325b33f4e466d08f26722d9b4618a3bb56971e0d99

SHA512
d3535288a9ca00df00b27142fbc00a0f54dc8488830511f9fb3763413639eec71441f748e578e0900c5b0323de6261983f5dc0e34ed38a5b102cca81efc4a29f

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/tmp/vga.conf

Filesize
4B

MD5
c88d8d0a6097754525e02c2246d8d27f

SHA1
41e842e76e8ea73f910aac95ea1ac9f0707643b2

SHA256
75abf1771c0d9038e45203aa603758410f2418fd29b3fe0c25534009c579bb8e

SHA512
1d6570970732ea371630b3616c00b9d65ff964eb564ac6858c4991e4d85fadc1082669fc0fd28af501cf6d08d9a253d46c1487abbbadce26c8d4934f26949f6b

Download Submit
/usr/bin/bsd-port/knerl

Filesize
1.1MB

MD5
7d1343b3ab670b162fb2ce8854f01167

SHA1
de95e608dd0e97d5eca90b6b6d747465980d4857

SHA256
6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23

SHA512
22ff942fcaabe8a63919a53bf68642dd45943ef3c24e558b18d51ca5c4c0209be653ec268f9d0f64b5634e9dd3e32f7eacdb746fd2263907c0f8f33d89dd91be

Download Submit
/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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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads