47c0af3e024fb5b38a97768bb9f6dce954fe358ce7f24c46dcc23689e8687a70

Resubmissions

02-06-2022 16:55

220602-vfcmtaghc7 10

08-03-2022 22:23

220308-2ar9msbef2 9

Analysis

max time kernel
0s
max time network
21s
platform
linux_amd64
resource
ubuntu1804-amd64-en-20211208
submitted
08-03-2022 22:23

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General

Target

x.o
Size

611KB
MD5

d46dd322e3cefa2b6eda0c96b84f7611
SHA1

5dae4f419d23a4d5f42d4ea0e5d67382d26b34ca
SHA256

47c0af3e024fb5b38a97768bb9f6dce954fe358ce7f24c46dcc23689e8687a70
SHA512

8c3047a1ffa39982c39cb04d2fad34a49502711a004448176945c60a1aeed177676cc920ef02ddb81c1205935ed05ca46630cee165d2c36fdc08059264f0dc5d

Score

9^/10

persistence

Malware Config

Signatures

Writes file to system bin folder 1 TTPs 3 IoCs

Hijack Execution Flow

T1574

description	ioc
/bin/utdxxuwexo	/bin/utdxxuwexo
/bin/ykvwdhemok	/bin/ykvwdhemok
/bin/xafxrsrfcv	/bin/xafxrsrfcv

Creates/modifies Cron job 1 TTPs 2 IoCs

Cron allows running tasks on a schedule, and is commonly used for malware persistence.

persistence

Scheduled Task

T1053

description	ioc	Process
/etc/crontab	/etc/crontab	sed
/etc/crontab	/etc/crontab	sh

Modifies rc script 1 TTPs 12 IoCs

Adding/modifying system rc scripts is a common persistence mechanism.

persistence

Boot or Logon Autostart Execution

T1547

description	ioc	Process
/etc/rc5.d/S90x.o	/etc/rc5.d/S90x.o	Process not Found
/etc/rc4.d/	/etc/rc4.d/	update-rc.d
/etc/rc3.d/	/etc/rc3.d/	update-rc.d
/etc/rc2.d/	/etc/rc2.d/	update-rc.d
/etc/rc6.d/	/etc/rc6.d/	update-rc.d
/etc/rc1.d/	/etc/rc1.d/	update-rc.d
/etc/rc1.d/S90x.o	/etc/rc1.d/S90x.o	Process not Found
/etc/rc2.d/S90x.o	/etc/rc2.d/S90x.o	Process not Found
/etc/rc3.d/S90x.o	/etc/rc3.d/S90x.o	Process not Found
/etc/rc4.d/S90x.o	/etc/rc4.d/S90x.o	Process not Found
/etc/rc0.d/	/etc/rc0.d/	update-rc.d
/etc/rc5.d/	/etc/rc5.d/	update-rc.d

Write file to user bin folder 1 TTPs 4 IoCs

Hijack Execution Flow

T1574

description	ioc	Process
/usr/bin/xafxrsrfcv	/usr/bin/xafxrsrfcv	Process not Found
/usr/sbin/update-rc.d	/usr/sbin/update-rc.d	update-rc.d
/usr/bin/utdxxuwexo	/usr/bin/utdxxuwexo	Process not Found
/usr/bin/ykvwdhemok	/usr/bin/ykvwdhemok	Process not Found

Reads runtime system information 7 IoCs

Reads data from /proc virtual filesystem.

description	ioc	Process
/proc/filesystems	/proc/filesystems	systemctl
/proc/self/stat	/proc/self/stat	systemctl
/proc/sys/kernel/osrelease	/proc/sys/kernel/osrelease	systemctl
/proc/1/environ	/proc/1/environ	systemctl
/proc/1/sched	/proc/1/sched	systemctl
/proc/cmdline	/proc/cmdline	systemctl
/proc/filesystems	/proc/filesystems	sed

Writes file to tmp directory 3 IoCs

Malware often drops required files in the /tmp directory.

description	ioc
/tmp/utdxxuwexo	/tmp/utdxxuwexo
/tmp/ykvwdhemok	/tmp/ykvwdhemok
/tmp/xafxrsrfcv	/tmp/xafxrsrfcv

./x.o
./x.o
1⤵
PID:580

/bin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/sbin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/usr/bin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/usr/sbin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/usr/local/bin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/usr/local/sbin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/usr/X11R6/bin/chkconfig
chkconfig --add x.o
1⤵
PID:583

/bin/sh
sh -c "sed -i '/\\/etc\\/cron.hourly\\/gcc.sh/d' /etc/crontab && echo '*/3 * * * * root /etc/cron.hourly/gcc.sh' >> /etc/crontab"
1⤵
- Creates/modifies Cron job
PID:586
- /bin/sed
  sed -i "/\\/etc\\/cron.hourly\\/gcc.sh/d" /etc/crontab
  2⤵
  - Creates/modifies Cron job
  - Reads runtime system information
  PID:587

/bin/update-rc.d
update-rc.d x.o defaults
1⤵
PID:585

/sbin/update-rc.d
update-rc.d x.o defaults
1⤵
PID:585

/usr/bin/update-rc.d
update-rc.d x.o defaults
1⤵
PID:585

/usr/sbin/update-rc.d
update-rc.d x.o defaults
1⤵
- Modifies rc script
- Write file to user bin folder
PID:585
- /bin/systemctl
  systemctl daemon-reload
  2⤵
  - Reads runtime system information
  PID:592

/usr/bin/utdxxuwexo
/usr/bin/utdxxuwexo ls 581
1⤵
PID:593

/usr/bin/utdxxuwexo
/usr/bin/utdxxuwexo pwd 581
1⤵
PID:611

/usr/bin/utdxxuwexo
/usr/bin/utdxxuwexo "route -n" 581
1⤵
PID:614

/usr/bin/utdxxuwexo
/usr/bin/utdxxuwexo pwd 581
1⤵
PID:617

/usr/bin/utdxxuwexo
/usr/bin/utdxxuwexo "echo \"find\"" 581
1⤵
PID:624

/usr/bin/ykvwdhemok
/usr/bin/ykvwdhemok "route -n" 581
1⤵
PID:627

/usr/bin/ykvwdhemok
/usr/bin/ykvwdhemok ls 581
1⤵
PID:630

/usr/bin/ykvwdhemok
/usr/bin/ykvwdhemok who 581
1⤵
PID:633

/usr/bin/ykvwdhemok
/usr/bin/ykvwdhemok top 581
1⤵
PID:636

/usr/bin/ykvwdhemok
/usr/bin/ykvwdhemok bash 581
1⤵
PID:639

/usr/bin/xafxrsrfcv
/usr/bin/xafxrsrfcv "cat resolv.conf" 581
1⤵
PID:642

/usr/bin/xafxrsrfcv
/usr/bin/xafxrsrfcv "echo \"find\"" 581
1⤵
PID:645

/usr/bin/xafxrsrfcv
/usr/bin/xafxrsrfcv "sleep 1" 581
1⤵
PID:648

/usr/bin/xafxrsrfcv
/usr/bin/xafxrsrfcv top 581
1⤵
PID:651

/usr/bin/xafxrsrfcv
/usr/bin/xafxrsrfcv "cd /etc" 581
1⤵
PID:654

/usr/bin/yveadkxxfo
/usr/bin/yveadkxxfo ifconfig 581
1⤵
PID:657

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Hijack Execution Flow

T1574

Scheduled Task

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Hijack Execution Flow

T1574

Scheduled Task

T1053

Defense Evasion

Hijack Execution Flow

T1574

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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