Malware Analysis Report

2025-01-22 08:47

Sample ID 241027-ts5npazfqr
Target A9ZFW_file.exe
SHA256 5ccc7cf886a54dfc66eac92fc4cb4acc8cfc5069ca3912abb4f8801831bf1fdc
Tags
stealc puma credential_access discovery evasion spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

5ccc7cf886a54dfc66eac92fc4cb4acc8cfc5069ca3912abb4f8801831bf1fdc

Threat Level: Known bad

The file A9ZFW_file.exe was found to be: Known bad.

Malicious Activity Summary

stealc puma credential_access discovery evasion spyware stealer

Stealc

Stealc family

Identifies VirtualBox via ACPI registry values (likely anti-VM)

Unsecured Credentials: Credentials In Files

Identifies Wine through registry keys

Checks BIOS information in registry

Checks computer location settings

Reads data files stored by FTP clients

Deletes itself

Checks installed software on the system

Suspicious use of NtSetInformationThreadHideFromDebugger

System Location Discovery: System Language Discovery

Enumerates physical storage devices

Unsigned PE

Checks processor information in registry

Delays execution with timeout.exe

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-27 16:20

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-10-27 16:20

Reported

2024-10-27 16:22

Platform

win7-20241010-en

Max time kernel

121s

Max time network

125s

Command Line

"C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe"

Signatures

Stealc

stealer stealc

Stealc family

stealc

Identifies VirtualBox via ACPI registry values (likely anti-VM)

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Identifies Wine through registry keys

evasion
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Wine C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Reads data files stored by FTP clients

spyware stealer

Unsecured Credentials: Credentials In Files

credential_access stealer

Checks installed software on the system

discovery

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\timeout.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe

"C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe" & del "C:\ProgramData\*.dll"" & exit

C:\Windows\SysWOW64\timeout.exe

timeout /t 5

Network

Country Destination Domain Proto
RU 185.215.113.206:80 185.215.113.206 tcp

Files

memory/2900-0-0x0000000000CA0000-0x000000000133F000-memory.dmp

memory/2900-1-0x0000000077D20000-0x0000000077D22000-memory.dmp

memory/2900-2-0x0000000000CA1000-0x0000000000CC4000-memory.dmp

memory/2900-3-0x0000000000CA0000-0x000000000133F000-memory.dmp

memory/2900-4-0x0000000000CA0000-0x000000000133F000-memory.dmp

memory/2900-7-0x0000000000CA0000-0x000000000133F000-memory.dmp

memory/2900-5-0x0000000000CA0000-0x000000000133F000-memory.dmp

memory/2900-6-0x0000000000CA0000-0x000000000133F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-27 16:20

Reported

2024-10-27 16:22

Platform

win10v2004-20241007-en

Max time kernel

135s

Max time network

142s

Command Line

"C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe"

Signatures

Stealc

stealer stealc

Stealc family

stealc

Identifies VirtualBox via ACPI registry values (likely anti-VM)

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Identifies Wine through registry keys

evasion
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Software\Wine C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Reads data files stored by FTP clients

spyware stealer

Unsecured Credentials: Credentials In Files

credential_access stealer

Checks installed software on the system

discovery

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\timeout.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1056 wrote to memory of 3472 N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe C:\Windows\SysWOW64\cmd.exe
PID 1056 wrote to memory of 3472 N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe C:\Windows\SysWOW64\cmd.exe
PID 1056 wrote to memory of 3472 N/A C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe C:\Windows\SysWOW64\cmd.exe
PID 3472 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3472 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3472 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe

Processes

C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe

"C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\A9ZFW_file.exe" & del "C:\ProgramData\*.dll"" & exit

C:\Windows\SysWOW64\timeout.exe

timeout /t 5

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
RU 185.215.113.206:80 185.215.113.206 tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.28.10:443 g.bing.com tcp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 206.113.215.185.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 107.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 69.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp

Files

memory/1056-0-0x0000000000C00000-0x000000000129F000-memory.dmp

memory/1056-1-0x0000000077DD4000-0x0000000077DD6000-memory.dmp

memory/1056-2-0x0000000000C01000-0x0000000000C24000-memory.dmp

memory/1056-3-0x0000000000C00000-0x000000000129F000-memory.dmp

memory/1056-5-0x0000000000C00000-0x000000000129F000-memory.dmp