mrblack | 6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23

Analysis

max time kernel
149s
max time network
131s
platform
ubuntu-20.04_amd64
resource
ubuntu2004-amd64-20240221-en
resource tags

arch:amd64arch:i386image:ubuntu2004-amd64-20240221-enkernel:5.4.0-169-genericlocale:en-usos:ubuntu-20.04-amd64system
submitted
04-05-2024 20:29

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General

Target

7d1343b3ab670b162fb2ce8854f01167.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	1959	knerl
/usr/bin/pythno	1983	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	7d1343b3ab670b162fb2ce8854f01167.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	7d1343b3ab670b162fb2ce8854f01167.elf

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/knerl.conf	knerl
File opened for modification	/usr/bin/pythno	cp
File opened for modification	/usr/bin/ps	cp
File opened for modification	/usr/bin/bsd-port/knerl.conf	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for modification	/usr/bin/bsd-port/udevd.conf	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for modification	/usr/bin/bsd-port/knerl	cp
File opened for modification	/usr/bin/dpkgd/lsof	cp
File opened for modification	/usr/bin/dpkgd/ps	cp
File opened for modification	/usr/bin/lsof	cp

Writes file to system bin folder 1 TTPs 2 IoCs

Hijack Execution Flow

T1574

description	ioc	Process
File opened for modification	/bin/lsof	cp
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	7d1343b3ab670b162fb2ce8854f01167.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/route	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for reading	/proc/net/arp	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for reading	/proc/net/dev	knerl
File opened for reading	/proc/net/dev	7d1343b3ab670b162fb2ce8854f01167.elf

Reads runtime system information 24 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/filesystems	cp
File opened for reading	/proc/stat	knerl
File opened for reading	/proc/cmdline	insmod
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/sys/kernel/version	knerl
File opened for reading	/proc/filesystems	mkdir
File opened for reading	/proc/meminfo	7d1343b3ab670b162fb2ce8854f01167.elf
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/sys/kernel/version	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/sys/kernel/version	pythno
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/stat	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for reading	/proc/filesystems	cp
File opened for reading	/proc/meminfo	knerl
File opened for reading	/proc/filesystems	cp

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	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for modification	/tmp/apsh.conf	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for modification	/tmp/vga.conf	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for modification	/tmp/notify.file	7d1343b3ab670b162fb2ce8854f01167.elf
File opened for modification	/tmp/conf.n	7d1343b3ab670b162fb2ce8854f01167.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/7d1343b3ab670b162fb2ce8854f01167.elf
/tmp/7d1343b3ab670b162fb2ce8854f01167.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:1484
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc1.d/S97VsystemsshMdt"
  2⤵
  PID:1906
- - /usr/bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc1.d/S97VsystemsshMdt
    3⤵
    PID:1907
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc2.d/S97VsystemsshMdt"
  2⤵
  PID:1908
- - /usr/bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc2.d/S97VsystemsshMdt
    3⤵
    PID:1909
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc3.d/S97VsystemsshMdt"
  2⤵
  PID:1910
- - /usr/bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc3.d/S97VsystemsshMdt
    3⤵
    PID:1911
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc4.d/S97VsystemsshMdt"
  2⤵
  PID:1912
- - /usr/bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc4.d/S97VsystemsshMdt
    3⤵
    PID:1913
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMdt /etc/rc5.d/S97VsystemsshMdt"
  2⤵
  PID:1914
- - /usr/bin/ln
    ln -s /etc/init.d/VsystemsshMdt /etc/rc5.d/S97VsystemsshMdt
    3⤵
    PID:1915
- /bin/sh
  sh -c "mkdir -p /usr/bin/bsd-port"
  2⤵
  PID:1916
- - /usr/bin/mkdir
    mkdir -p /usr/bin/bsd-port
    3⤵
    - Reads runtime system information
    PID:1917
- /bin/sh
  sh -c "cp -f /tmp/7d1343b3ab670b162fb2ce8854f01167.elf /usr/bin/bsd-port/knerl"
  2⤵
  PID:1918
- - /usr/bin/cp
    cp -f /tmp/7d1343b3ab670b162fb2ce8854f01167.elf /usr/bin/bsd-port/knerl
    3⤵
    - Write file to user bin folder
    - Reads runtime system information
    PID:1919
- /bin/sh
  sh -c /usr/bin/bsd-port/knerl
  2⤵
  PID:1958
- - /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:1959
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
      4⤵
      PID:1967
    - - /usr/bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
        5⤵
        
        PID:1968
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
      4⤵
      PID:1969
    - - /usr/bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
        5⤵
        
        PID:1970
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
      4⤵
      PID:1971
    - - /usr/bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
        5⤵
        
        PID:1972
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
      4⤵
      PID:1973
    - - /usr/bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
        5⤵
        
        PID:1974
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
      4⤵
      PID:1975
    - - /usr/bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
        5⤵
        
        PID:1976
  - - /bin/sh
      sh -c "mkdir -p /usr/bin/dpkgd"
      4⤵
      PID:1977
    - - /usr/bin/mkdir
        
        mkdir -p /usr/bin/dpkgd
        5⤵
        Reads runtime system information
        
        PID:1978
  - - /bin/sh
      sh -c "cp -f /bin/lsof /usr/bin/dpkgd/lsof"
      4⤵
      PID:1979
    - - /usr/bin/cp
        
        cp -f /bin/lsof /usr/bin/dpkgd/lsof
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1980
  - - /bin/sh
      sh -c "mkdir -p /bin"
      4⤵
      PID:1987
    - - /usr/bin/mkdir
        
        mkdir -p /bin
        5⤵
        Reads runtime system information
        
        PID:1988
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/knerl /bin/lsof"
      4⤵
      PID:1989
    - - /usr/bin/cp
        
        cp -f /usr/bin/bsd-port/knerl /bin/lsof
        5⤵
        Writes file to system bin folder
        Reads runtime system information
        
        PID:1991
  - - /bin/sh
      sh -c "chmod 0755 /bin/lsof"
      4⤵
      PID:1994
    - - /usr/bin/chmod
        
        chmod 0755 /bin/lsof
        5⤵
        
        PID:1995
  - - /bin/sh
      sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
      4⤵
      PID:1997
    - - /usr/bin/cp
        
        cp -f /bin/ps /usr/bin/dpkgd/ps
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1999
  - - /bin/sh
      sh -c "mkdir -p /bin"
      4⤵
      PID:2002
    - - /usr/bin/mkdir
        
        mkdir -p /bin
        5⤵
        Reads runtime system information
        
        PID:2003
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/knerl /bin/ps"
      4⤵
      PID:2004
    - - /usr/bin/cp
        
        cp -f /usr/bin/bsd-port/knerl /bin/ps
        5⤵
        Writes file to system bin folder
        Reads runtime system information
        
        PID:2005
  - - /bin/sh
      sh -c "chmod 0755 /bin/ps"
      4⤵
      PID:2006
    - - /usr/bin/chmod
        
        chmod 0755 /bin/ps
        5⤵
        
        PID:2007
  - - /bin/sh
      sh -c "mkdir -p /usr/bin"
      4⤵
      PID:2008
    - - /usr/bin/mkdir
        
        mkdir -p /usr/bin
        5⤵
        Reads runtime system information
        
        PID:2009
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/knerl /usr/bin/lsof"
      4⤵
      PID:2010
    - - /usr/bin/cp
        
        cp -f /usr/bin/bsd-port/knerl /usr/bin/lsof
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:2011
  - - /bin/sh
      sh -c "chmod 0755 /usr/bin/lsof"
      4⤵
      PID:2012
    - - /usr/bin/chmod
        
        chmod 0755 /usr/bin/lsof
        5⤵
        
        PID:2013
  - - /bin/sh
      sh -c "mkdir -p /usr/bin"
      4⤵
      PID:2014
    - - /usr/bin/mkdir
        
        mkdir -p /usr/bin
        5⤵
        Reads runtime system information
        
        PID:2015
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/knerl /usr/bin/ps"
      4⤵
      PID:2016
    - - /usr/bin/cp
        
        cp -f /usr/bin/bsd-port/knerl /usr/bin/ps
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:2017
  - - /bin/sh
      sh -c "chmod 0755 /usr/bin/ps"
      4⤵
      PID:2018
    - - /usr/bin/chmod
        
        chmod 0755 /usr/bin/ps
        5⤵
        
        PID:2019
  - - /bin/sh
      sh -c "insmod /usr/lib/xpacket.ko"
      4⤵
      PID:2020
    - - /usr/sbin/insmod
        
        insmod /usr/lib/xpacket.ko
        5⤵
        Reads runtime system information
        
        PID:2021
- /bin/sh
  sh -c "mkdir -p /usr/bin"
  2⤵
  PID:1961
- - /usr/bin/mkdir
    mkdir -p /usr/bin
    3⤵
    - Reads runtime system information
    PID:1962
- /bin/sh
  sh -c "cp -f /tmp/7d1343b3ab670b162fb2ce8854f01167.elf /usr/bin/pythno"
  2⤵
  PID:1963
- - /usr/bin/cp
    cp -f /tmp/7d1343b3ab670b162fb2ce8854f01167.elf /usr/bin/pythno
    3⤵
    - Write file to user bin folder
    - Reads runtime system information
    PID:1964
- /bin/sh
  sh -c /usr/bin/pythno
  2⤵
  PID:1982
- - /usr/bin/pythno
    /usr/bin/pythno
    3⤵
    - Executes dropped EXE
    - Reads runtime system information
    - Writes file to tmp directory
    PID:1983
- /bin/sh
  sh -c "insmod /usr/lib/xpacket.ko"
  2⤵
  PID:1985
- - /usr/sbin/insmod
    insmod /usr/lib/xpacket.ko
    3⤵
    - Reads runtime system information
    PID:1986

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
54B

MD5
7437757cf8e37ddd08b9321e6e9373c3

SHA1
d2c1823eee72a73bf4770d232e898a7f2c7f85c7

SHA256
7a64bce85e9827750a044f5f7c3bb4251a1c383a8ad0489d33158cd1253b8643

SHA512
b71b291888bd1d9db194b2d7bded73b7af6308d801346e1fc356746953a9da62f392ce55dc4eabd4b3476024562ababdaf1582a50e7eb4bf6c9f12f116d0e92b

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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
1b36ea1c9b7a1c3ad668b8bb5df7963f

SHA1
d0ee345e31f83883d76b54edd9964410adbd191b

SHA256
4dea5c7cb70f50322ec9d734aa4aa078be9227c05251e18991c596f387552370

SHA512
4bec3153d5ed9d21e831a83767a63fb41ae6e51694df7534c8ef8e82d44eeb965dbab80069a57a93548b58449b72eadad7074a61681f3b64e0cce096c141b41e

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/tmp/notify.file

Filesize
41B

MD5
b254bafba40c4198c282f6fb3e7631ef

SHA1
209ff641f4b6e554a3173c93d66189ad70f400dd

SHA256
2b69b6e6ab6121a26aa27b54d1dedf33011881861d02bafdd8542defb1abcb8e

SHA512
d6988ca3a99fef0efed08bf3b57edc9c53f642b16751cf1ba5e6f450b14c45ae08989b8b8a41451abf792882b74b2ac8b4e1f11c813c1c880b22708af6b1af82

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/tmp/vga.conf

Filesize
4B

MD5
7fb8ceb3bd59c7956b1df66729296a4c

SHA1
537337c8d4656d862c12e79427c9232b5b7d803e

SHA256
c010bb0f7f8f335ccb2bc4e598eee48be11f87ac60a39a1a1cb4185688857003

SHA512
4731a9abe7ec220f2b73db47054a367e934e19811077445d1d16a4d2c9b3829f1a49d07dc4652d497a83cd88026a7eb2fa13fb0b645f92caae21afa29f3557c3

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/usr/bin/bsd-port/knerl

Filesize
1.1MB

MD5
7d1343b3ab670b162fb2ce8854f01167

SHA1
de95e608dd0e97d5eca90b6b6d747465980d4857

SHA256
6674baf9b5ee9baf415ae92ed69b522bf1367cceb60cfd57ae7bc4b8e0677a23

SHA512
22ff942fcaabe8a63919a53bf68642dd45943ef3c24e558b18d51ca5c4c0209be653ec268f9d0f64b5634e9dd3e32f7eacdb746fd2263907c0f8f33d89dd91be

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/usr/bin/dpkgd/lsof

Filesize
171KB

MD5
061386937ec7acf924438a2643a32be0

SHA1
01a044b9e58839bea3e58c66cb32acc16241bf91

SHA256
8a26bbae9eb85aa98ef29cfe5b0a291234db6eb394c3e0c2841983dcf7dda959

SHA512
2de2e56ac4c32f47b4a1945ccfb0db378e6d59019ee8004e3e5d2ec8935efb5aa8ee14b8a0b21c61a267e195d42a3232a6dcade8720de06118fd579277f59db7

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/usr/bin/dpkgd/ps

Filesize
134KB

MD5
d194576b899af45b1d2a448612ec21e5

SHA1
492f7d8f28cd4397ce22fcf0d8bf3304ea93465a

SHA256
a8cf81f3a1137c999c3cf336507ce120b3065e633ade01db6280d427b7d986ca

SHA512
b323babd9580b91772cde29c9f22ae75b27f5ce8ce0268a48ca41713c3545dd72409932a5c48f6af66ac6e43127eb5461d1f686bd667fa1b0e56a1564db3c539

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads