Malware Analysis Report

2024-10-16 03:28

Sample ID 220112-hvx6vabee9
Target decryptor.zip
SHA256 e737c901b80ad9ed2cd800fec7c2554178c8afab196fb55a0df36acda1324721
Tags
avoslocker ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

e737c901b80ad9ed2cd800fec7c2554178c8afab196fb55a0df36acda1324721

Threat Level: Known bad

The file decryptor.zip was found to be: Known bad.

Malicious Activity Summary

avoslocker ransomware

Avoslocker Ransomware

Enumerates physical storage devices

Modifies registry class

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-01-12 07:04

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-01-12 07:04

Reported

2022-01-12 07:05

Platform

win7-en-20211208

Max time kernel

16s

Max time network

19s

Command Line

"C:\Users\Admin\AppData\Local\Temp\app\decryptor_avos2.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Processes

C:\Users\Admin\AppData\Local\Temp\app\decryptor_avos2.exe

"C:\Users\Admin\AppData\Local\Temp\app\decryptor_avos2.exe"

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2022-01-12 07:04

Reported

2022-01-12 07:05

Platform

win10-en-20211208

Max time kernel

15s

Max time network

21s

Command Line

"C:\Users\Admin\AppData\Local\Temp\app\decryptor_avos2.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Processes

C:\Users\Admin\AppData\Local\Temp\app\decryptor_avos2.exe

"C:\Users\Admin\AppData\Local\Temp\app\decryptor_avos2.exe"

Network

Country Destination Domain Proto
IE 52.109.76.30:443 tcp
US 8.8.8.8:53 time.windows.com udp
US 168.61.215.74:123 time.windows.com udp

Files

N/A

Analysis: behavioral3

Detonation Overview

Submitted

2022-01-12 07:04

Reported

2022-01-12 07:05

Platform

win7-en-20211208

Max time kernel

14s

Max time network

17s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\app\linux\decryptor.elf

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\.elf\ = "elf_auto_file" C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\elf_auto_file\shell C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\elf_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\"" C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_Classes\Local Settings C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\elf_auto_file C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\elf_auto_file\ C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\.elf C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\elf_auto_file\shell\Read C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\elf_auto_file\shell\Read\command C:\Windows\system32\rundll32.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe N/A
N/A N/A C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe N/A

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\app\linux\decryptor.elf

C:\Windows\system32\rundll32.exe

"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\app\linux\decryptor.elf

C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe

"C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\app\linux\decryptor.elf"

Network

N/A

Files

memory/1540-54-0x000007FEFBE91000-0x000007FEFBE93000-memory.dmp

memory/756-55-0x0000000000000000-mapping.dmp

memory/1644-57-0x0000000000000000-mapping.dmp

memory/1644-58-0x0000000075891000-0x0000000075893000-memory.dmp

Analysis: behavioral4

Detonation Overview

Submitted

2022-01-12 07:04

Reported

2022-01-12 07:05

Platform

win10-en-20211208

Max time kernel

14s

Max time network

21s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\app\linux\decryptor.elf

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2361464256-2201551969-2316606395-1000_Classes\Local Settings C:\Windows\system32\cmd.exe N/A
Key created \REGISTRY\USER\S-1-5-21-2361464256-2201551969-2316606395-1000_Classes\Local Settings C:\Windows\system32\OpenWith.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\OpenWith.exe N/A

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\app\linux\decryptor.elf

C:\Windows\system32\OpenWith.exe

C:\Windows\system32\OpenWith.exe -Embedding

Network

Country Destination Domain Proto
US 52.109.8.19:443 tcp
US 8.8.8.8:53 time.windows.com udp
NL 40.119.148.38:123 time.windows.com udp

Files

N/A