f7637b2a1a676457675aa59c03289c0fe3f5310b3441ce8d25a17cd05ca6b6a6

Analysis

max time kernel
149s
max time network
151s
platform
debian-9_armhf
resource
debian9-armhf-20250619-en
resource tags

arch:armhfimage:debian9-armhf-20250619-enkernel:4.9.0-13-armmp-lpaelocale:en-usos:debian-9-armhfsystem
submitted
14/07/2025, 00:04

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General

Target
arm926t.elf
Size 469KB
Sample250714-acrbksap21
SHA256 f7637b2a1a676457675aa59c03289c0fe3f5310b3441ce8d25a17cd05ca6b6a6
MD5 caca0eafd3b31d9891f6d68954e7e9ea
SHA1 f04426b8d84dace13c7557a825a0c68e7510a1b2
SHA512 ac73f20c4879e8064d5cd9570ebbb8fb268b4dd79e11c3c953ca631fee35a4a6f8600dae0eea6715d6c38c3a0c7df858ec08baa3180983f1213f64ea8867c9c1
SSDEEP 12288:ndLGtVtlmIHk6Rtx02O6R+9X8C5SGEzf:pGntlzJx02O6E9X8XG
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

antivm defense_evasion discovery execution persistence privilege_escalation

Malware Config

Signatures

Renames itself 1 IoCs

pid	Process
642	arm926t.elf

Checks hardware identifiers (DMI) 1 TTPs 2 IoCs

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

antivm

System Checks

T1497.001

description	ioc	Process
File opened for reading	/sys/class/dmi/id/board_vendor	configuration
File opened for reading	/sys/devices/virtual/dmi/id/board_vendor	configuration

Creates/modifies Cron job 1 TTPs 1 IoCs

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

execution persistence privilege_escalation

Cron

T1053.003

description	ioc	Process
File opened for modification	/var/spool/cron/crontabs/tmp.2kocMQ	crontab

Enumerates running processes
Discovers information about currently running processes on the system

Reads MAC address of network interface 2 TTPs 1 IoCs

Fetches the MAC address of active network interfaces. May be used to detect known values for hypervisors.

defense_evasion discovery

System Network Connections Discovery

T1049

Wi-Fi Discovery

T1016.002

description	ioc	Process
File opened for reading	/sys/class/net/eth0/address	configuration

Reads hardware information 1 TTPs 4 IoCs

Accesses system info like serial numbers, manufacturer names etc.

discovery

System Information Discovery

T1082

description	ioc	Process
File opened for reading	/sys/devices/virtual/dmi/id/product_uuid	configuration
File opened for reading	/sys/class/dmi/id/board_name	configuration
File opened for reading	/sys/class/dmi/id/product_uuid	configuration
File opened for reading	/sys/devices/virtual/dmi/id/board_name	configuration

Checks CPU configuration 1 TTPs 1 IoCs

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

antivm

System Checks

T1497.001

description	ioc	Process
File opened for reading	/proc/cpuinfo	configuration

Enumerates kernel/hardware configuration 1 TTPs 1 IoCs

Reads contents of /sys virtual filesystem to enumerate system information.

discovery

System Information Discovery

T1082

description	ioc	Process
File opened for reading	/sys/class/net	configuration

Reads runtime system information 64 IoCs

Reads data from /proc virtual filesystem.

discovery

description	ioc	Process
File opened for reading	/proc/292/cmdline	configuration
File opened for reading	/proc/583/cmdline	configuration
File opened for reading	/proc/587/cmdline	configuration
File opened for reading	/proc/24/cmdline	configuration
File opened for reading	/proc/588/cmdline	configuration
File opened for reading	/proc/673/cmdline	configuration
File opened for reading	/proc/9/cmdline	configuration
File opened for reading	/proc/13/cmdline	configuration
File opened for reading	/proc/107/cmdline	configuration
File opened for reading	/proc/305/cmdline	configuration
File opened for reading	/proc/16/cmdline	configuration
File opened for reading	/proc/25/cmdline	configuration
File opened for reading	/proc/109/cmdline	configuration
File opened for reading	/proc/158/cmdline	configuration
File opened for reading	/proc/303/cmdline	configuration
File opened for reading	/proc/3/cmdline	configuration
File opened for reading	/proc/18/cmdline	configuration
File opened for reading	/proc/19/cmdline	configuration
File opened for reading	/proc/22/cmdline	configuration
File opened for reading	/proc/137/cmdline	configuration
File opened for reading	/proc/647/cmdline	configuration
File opened for reading	/proc/20/cmdline	configuration
File opened for reading	/proc/98/cmdline	configuration
File opened for reading	/proc/169/cmdline	configuration
File opened for reading	/proc/320/cmdline	configuration
File opened for reading	/proc/1/cmdline	configuration
File opened for reading	/proc/136/cmdline	configuration
File opened for reading	/proc/7/cmdline	configuration
File opened for reading	/proc/8/cmdline	configuration
File opened for reading	/proc/23/cmdline	configuration
File opened for reading	/proc/42/cmdline	configuration
File opened for reading	/proc/110/cmdline	configuration
File opened for reading	/proc/285/cmdline	configuration
File opened for reading	/proc/306/cmdline	configuration
File opened for reading	/proc/639/cmdline	configuration
File opened for reading	/proc/4/cmdline	configuration
File opened for reading	/proc/10/cmdline	configuration
File opened for reading	/proc/12/cmdline	configuration
File opened for reading	/proc/146/cmdline	configuration
File opened for reading	/proc/193/cmdline	configuration
File opened for reading	/proc/640/cmdline	configuration
File opened for reading	/proc/659/cmdline	configuration
File opened for reading	/proc/mounts	configuration
File opened for reading	/proc/device-tree/model	configuration
File opened for reading	/proc/21/cmdline	configuration
File opened for reading	/proc/581/cmdline	configuration
File opened for reading	/proc/634/cmdline	configuration
File opened for reading	/proc/6/cmdline	configuration
File opened for reading	/proc/28/cmdline	configuration
File opened for reading	/proc/41/cmdline	configuration
File opened for reading	/proc/223/cmdline	configuration
File opened for reading	/proc/333/cmdline	configuration
File opened for reading	/proc/568/cmdline	configuration
File opened for reading	/proc/filesystems	crontab
File opened for reading	/proc/636/cmdline	configuration
File opened for reading	/proc/2/cmdline	configuration
File opened for reading	/proc/14/cmdline	configuration
File opened for reading	/proc/29/cmdline	configuration
File opened for reading	/proc/43/cmdline	configuration
File opened for reading	/proc/76/cmdline	configuration
File opened for reading	/proc/286/cmdline	configuration
File opened for reading	/proc/635/cmdline	configuration
File opened for reading	/proc/filesystems	crontab
File opened for reading	/proc/26/cmdline	configuration

Writes file to tmp directory 1 IoCs

Malware often drops required files in the /tmp directory.

description	ioc	Process
File opened for modification	/tmp/root1086f3d	configuration

/tmp/arm926t.elf
/tmp/arm926t.elf
1⤵
- Renames itself
PID:642
- /bin/sh
  sh -c "crontab -l"
  2⤵
  PID:644
- - /usr/bin/crontab
    crontab -l
    3⤵
    - Reads runtime system information
    PID:645
- /bin/sh
  sh -c "(crontab -l ; echo \"@reboot /root/.sys/configuration\")| crontab -"
  2⤵
  PID:650
- - /usr/bin/crontab
    crontab -l
    3⤵
    - Reads runtime system information
    PID:655
- - /usr/bin/crontab
    crontab -
    3⤵
    - Creates/modifies Cron job
    PID:654

/root/.sys/configuration
/tmp/arm926t.elf
1⤵
- Checks hardware identifiers (DMI)
- Reads MAC address of network interface
- Reads hardware information
- Checks CPU configuration
- Enumerates kernel/hardware configuration
- Reads runtime system information
- Writes file to tmp directory
PID:642

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Cron

T1053.003

Persistence

Scheduled Task/Job

T1053

Cron

T1053.003

Privilege Escalation

Scheduled Task/Job

T1053

Cron

T1053.003

Defense Evasion

Virtualization/Sandbox Evasion

T1497

System Checks

T1497.001

Credential Access

Discovery

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Wi-Fi Discovery

T1016.002

System Network Connections Discovery

T1049

Virtualization/Sandbox Evasion

T1497

System Checks

T1497.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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tmp.2kocMQ

Path /var/spool/cron/crontabs/tmp.2kocMQ
Size 208B
SHA256 d0a57f47319e296c3edb7832b3274ae8aa3f808271c59b968502e22f78de8987
MD5 0844a3920b5e897ffc4216e12b5c8ee5
SHA1 22e0a691342bd804146d0415feb59cb414a7551e
SHA512 e66b3abaf7482e55bdbe68efce95212d400fcca66e8467f9f6058b37923877a3f8fb42399af5105047fc7892e89fe28bcf0d7d22c9d22789fc853db6e00c781d
MD5 SHA1 SHA512

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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