mrblack | a7d548bcb9a58a58b5dfb9f059b302131fc0107a094f1fbb53c7d525b9327b60

Analysis

max time kernel
149s
max time network
131s
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
04-05-2024 10:08

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General

Target

f57f99f56834d73211bac97f4ec2dc5c.elf
Size

1.1MB
MD5

f57f99f56834d73211bac97f4ec2dc5c
SHA1

314fff2c301fb120ce100e812e3ef4b31580551d
SHA256

a7d548bcb9a58a58b5dfb9f059b302131fc0107a094f1fbb53c7d525b9327b60
SHA512

c2785a0b3231ccd5c217f6ec38aa8ca3ece2cc3a3364a3271582ba49cf9ac8a5dfd163765c6284ba72c9bd4e711cc059ba328e6a7ad0b1adeb7e85447b9350a8
SSDEEP

24576:4vRE7caCfKGPqVEDNLFxKsfa1I+gIGYuuCol7r:4vREKfPqVE5jKsfa1RHGVo7r

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

Processes:

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

Executes dropped EXE 2 IoCs

Processes:

receioracle

ioc	pid	Process
/usr/bin/bsd-port/recei	1614	recei
/usr/bin/oracle	1632	oracle

Modifies init.d 1 TTPs 2 IoCs

Adds/modifies system service, likely for persistence.

persistence

Boot or Logon Autostart Execution

T1547

Processes:

f57f99f56834d73211bac97f4ec2dc5c.elfrecei

description	ioc	Process
File opened for modification	/etc/init.d/VsystemsshMmt	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for modification	/etc/init.d/selinux	recei

Reads system routing table 1 TTPs 1 IoCs

Gets active network interfaces from /proc virtual filesystem.

System Network Configuration Discovery

T1016

Processes:

f57f99f56834d73211bac97f4ec2dc5c.elf

description	ioc	Process
File opened for reading	/proc/net/route	f57f99f56834d73211bac97f4ec2dc5c.elf

Write file to user bin folder 1 TTPs 8 IoCs

Hijack Execution Flow

T1574

Processes:

cpreceicpcpcpcpf57f99f56834d73211bac97f4ec2dc5c.elf

description	ioc	Process
File opened for modification	/usr/bin/bsd-port/recei	cp
File opened for modification	/usr/bin/bsd-port/recei.conf	recei
File opened for modification	/usr/bin/oracle	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/recei.conf	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for modification	/usr/bin/bsd-port/udevd.conf	f57f99f56834d73211bac97f4ec2dc5c.elf

Writes file to system bin folder 1 TTPs 1 IoCs

Hijack Execution Flow

T1574

Processes:

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

Processes:

f57f99f56834d73211bac97f4ec2dc5c.elfrecei

description	ioc	Process
File opened for reading	/proc/cpuinfo	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for reading	/proc/cpuinfo	recei

Reads system network configuration 1 TTPs 4 IoCs

Uses contents of /proc filesystem to enumerate network settings.

System Network Configuration Discovery

T1016

Processes:

f57f99f56834d73211bac97f4ec2dc5c.elfrecei

description	ioc	Process
File opened for reading	/proc/net/route	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for reading	/proc/net/arp	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for reading	/proc/net/dev	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for reading	/proc/net/dev	recei

Reads runtime system information 17 IoCs

Reads data from /proc virtual filesystem.

Processes:

f57f99f56834d73211bac97f4ec2dc5c.elfmkdirmkdircpmkdircpmkdirinsmodcpinsmodcpcpmkdircprecei

description	ioc	Process
File opened for reading	/proc/stat	f57f99f56834d73211bac97f4ec2dc5c.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/meminfo	f57f99f56834d73211bac97f4ec2dc5c.elf
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	cp
File opened for reading	/proc/cmdline	insmod
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	cp
File opened for reading	/proc/stat	recei
File opened for reading	/proc/meminfo	recei

Writes file to tmp directory 8 IoCs

Malware often drops required files in the /tmp directory.

Processes:

f57f99f56834d73211bac97f4ec2dc5c.elforacle

description	ioc	Process
File opened for modification	/tmp/Dest.cfg	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for modification	/tmp/notify.file	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for modification	/tmp/conf.n	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for modification	/tmp/appd.log	oracle
File opened for modification	/tmp/notify.file	oracle
File opened for modification	/tmp/Dest.cfg	oracle
File opened for modification	/tmp/appd.log	f57f99f56834d73211bac97f4ec2dc5c.elf
File opened for modification	/tmp/appd.conf	f57f99f56834d73211bac97f4ec2dc5c.elf

/tmp/f57f99f56834d73211bac97f4ec2dc5c.elf
/tmp/f57f99f56834d73211bac97f4ec2dc5c.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:1569
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMmt /etc/rc1.d/S97VsystemsshMmt"
  2⤵
  PID:1598
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMmt /etc/rc1.d/S97VsystemsshMmt
    3⤵
    PID:1599
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMmt /etc/rc2.d/S97VsystemsshMmt"
  2⤵
  PID:1600
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMmt /etc/rc2.d/S97VsystemsshMmt
    3⤵
    PID:1601
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMmt /etc/rc3.d/S97VsystemsshMmt"
  2⤵
  PID:1602
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMmt /etc/rc3.d/S97VsystemsshMmt
    3⤵
    PID:1603
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMmt /etc/rc4.d/S97VsystemsshMmt"
  2⤵
  PID:1604
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMmt /etc/rc4.d/S97VsystemsshMmt
    3⤵
    PID:1605
- /bin/sh
  sh -c "ln -s /etc/init.d/VsystemsshMmt /etc/rc5.d/S97VsystemsshMmt"
  2⤵
  PID:1606
- - /bin/ln
    ln -s /etc/init.d/VsystemsshMmt /etc/rc5.d/S97VsystemsshMmt
    3⤵
    PID:1607
- /bin/sh
  sh -c "mkdir -p /usr/bin/bsd-port"
  2⤵
  PID:1608
- - /bin/mkdir
    mkdir -p /usr/bin/bsd-port
    3⤵
    - Reads runtime system information
    PID:1609
- /bin/sh
  sh -c "cp -f /tmp/f57f99f56834d73211bac97f4ec2dc5c.elf /usr/bin/bsd-port/recei"
  2⤵
  PID:1610
- - /bin/cp
    cp -f /tmp/f57f99f56834d73211bac97f4ec2dc5c.elf /usr/bin/bsd-port/recei
    3⤵
    - Write file to user bin folder
    - Reads runtime system information
    PID:1611
- /bin/sh
  sh -c /usr/bin/bsd-port/recei
  2⤵
  PID:1613
- - /usr/bin/bsd-port/recei
    /usr/bin/bsd-port/recei
    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:1614
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux"
      4⤵
      PID:1620
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc1.d/S99selinux
        5⤵
        
        PID:1621
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux"
      4⤵
      PID:1622
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc2.d/S99selinux
        5⤵
        
        PID:1623
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux"
      4⤵
      PID:1624
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc3.d/S99selinux
        5⤵
        
        PID:1625
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux"
      4⤵
      PID:1626
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc4.d/S99selinux
        5⤵
        
        PID:1627
  - - /bin/sh
      sh -c "ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux"
      4⤵
      PID:1628
    - - /bin/ln
        
        ln -s /etc/init.d/selinux /etc/rc5.d/S99selinux
        5⤵
        
        PID:1629
  - - /bin/sh
      sh -c "mkdir -p /usr/bin/dpkgd"
      4⤵
      PID:1635
    - - /bin/mkdir
        
        mkdir -p /usr/bin/dpkgd
        5⤵
        Reads runtime system information
        
        PID:1637
  - - /bin/sh
      sh -c "cp -f /bin/ps /usr/bin/dpkgd/ps"
      4⤵
      PID:1638
    - - /bin/cp
        
        cp -f /bin/ps /usr/bin/dpkgd/ps
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1639
  - - /bin/sh
      sh -c "mkdir -p /bin"
      4⤵
      PID:1641
    - - /bin/mkdir
        
        mkdir -p /bin
        5⤵
        Reads runtime system information
        
        PID:1642
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/recei /bin/ps"
      4⤵
      PID:1644
    - - /bin/cp
        
        cp -f /usr/bin/bsd-port/recei /bin/ps
        5⤵
        Writes file to system bin folder
        Reads runtime system information
        
        PID:1645
  - - /bin/sh
      sh -c "chmod 0755 /bin/ps"
      4⤵
      PID:1646
    - - /bin/chmod
        
        chmod 0755 /bin/ps
        5⤵
        
        PID:1647
  - - /bin/sh
      sh -c "cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof"
      4⤵
      PID:1649
    - - /bin/cp
        
        cp -f /usr/bin/lsof /usr/bin/dpkgd/lsof
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1650
  - - /bin/sh
      sh -c "mkdir -p /usr/bin"
      4⤵
      PID:1652
    - - /bin/mkdir
        
        mkdir -p /usr/bin
        5⤵
        Reads runtime system information
        
        PID:1653
  - - /bin/sh
      sh -c "cp -f /usr/bin/bsd-port/recei /usr/bin/lsof"
      4⤵
      PID:1654
    - - /bin/cp
        
        cp -f /usr/bin/bsd-port/recei /usr/bin/lsof
        5⤵
        Write file to user bin folder
        Reads runtime system information
        
        PID:1655
  - - /bin/sh
      sh -c "chmod 0755 /usr/bin/lsof"
      4⤵
      PID:1657
    - - /bin/chmod
        
        chmod 0755 /usr/bin/lsof
        5⤵
        
        PID:1658
  - - /bin/sh
      sh -c "insmod /usr/lib/xpacket.ko"
      4⤵
      PID:1659
    - - /sbin/insmod
        
        insmod /usr/lib/xpacket.ko
        5⤵
        Reads runtime system information
        
        PID:1661
- /bin/sh
  sh -c "mkdir -p /usr/bin"
  2⤵
  PID:1616
- - /bin/mkdir
    mkdir -p /usr/bin
    3⤵
    - Reads runtime system information
    PID:1617
- /bin/sh
  sh -c "cp -f /tmp/f57f99f56834d73211bac97f4ec2dc5c.elf /usr/bin/oracle"
  2⤵
  PID:1618
- - /bin/cp
    cp -f /tmp/f57f99f56834d73211bac97f4ec2dc5c.elf /usr/bin/oracle
    3⤵
    - Write file to user bin folder
    - Reads runtime system information
    PID:1619
- /bin/sh
  sh -c /usr/bin/oracle
  2⤵
  PID:1631
- - /usr/bin/oracle
    /usr/bin/oracle
    3⤵
    - Executes dropped EXE
    - Writes file to tmp directory
    PID:1632
- /bin/sh
  sh -c "insmod /usr/lib/xpacket.ko"
  2⤵
  PID:1634
- - /sbin/insmod
    insmod /usr/lib/xpacket.ko
    3⤵
    - Reads runtime system information
    PID:1636

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

Replay Monitor

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Downloads

/etc/init.d/VsystemsshMmt

Filesize
54B

MD5
780d1e94fbf15a6e57e7ff8d970ee4bf

SHA1
e7d237d21609781d96de3aebc496990290912422

SHA256
ca7a6faf512c369e20446026ac2f5bc03fab12d58e983877bfda2fce483cf512

SHA512
d38c1c89c140b17aa93142440a00a9dc328daf0bbe1c3664cf9c08ddaad1eaf3ae5c2d803b8cc5bfad2c35f80a65cf929335dfe31bd4d1ba1fb3fa51b3c3ed01

Download Submit
/etc/init.d/selinux

Filesize
36B

MD5
57cde9c165195cfb90c212057795ed49

SHA1
d77d9895306eb09ad9b54588fb7998c79c671563

SHA256
3e3488e9c63dfadffd594301e2192418b158238bfb8f83d6702123d72892cf36

SHA512
de9af53a508167cbbb820a99c2742918ec5b8c83877b77e43e4b441019311685647f47fb4666ba53ecef4e6a2d5514eb67981d471ddf173b04848609b3c0c00d

Download Submit
/tmp/Dest.cfg

Filesize
4B

MD5
7bd28f15a49d5e5848d6ec70e584e625

SHA1
d2fce7d4fae7323ea1b94f177e0a41a42fe0dd09

SHA256
aded40e220d2587b0ef1f88302a192d411bc55ddff1c4d818177777d6060a490

SHA512
f0ce80170e4bfc2929af244040c4d5dd5d317e80d3cac9883f162e55478b9825d07aa9114b8bb48f74fe28396ee02a2c59710b9d1109b6456ce4593cb1659d67

Download Submit
/tmp/notify.file

Filesize
41B

MD5
dcde7e8ce1b38785cd5d991edc31fee0

SHA1
857dce373987a8c7483829525c3c2f7b26ee506f

SHA256
cfc55c6c3cb3b4e530b9656b261c18b214c9dfad659c856317b47078e211032b

SHA512
5ee489b47fb04b2742eb61e72d805add50d78caf19b1dd7da4757a9987cd11c9e4028f77881b96888d54139343bf0ece1265da8406cce78424a54bd38201a74d

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

Filesize
1.1MB

MD5
f57f99f56834d73211bac97f4ec2dc5c

SHA1
314fff2c301fb120ce100e812e3ef4b31580551d

SHA256
a7d548bcb9a58a58b5dfb9f059b302131fc0107a094f1fbb53c7d525b9327b60

SHA512
c2785a0b3231ccd5c217f6ec38aa8ca3ece2cc3a3364a3271582ba49cf9ac8a5dfd163765c6284ba72c9bd4e711cc059ba328e6a7ad0b1adeb7e85447b9350a8

Download Submit
/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