Malware Analysis Report

2024-08-06 16:18

Sample ID 240624-mphana1fmr
Target Yashma ransomware builder v1.2.exe
SHA256 f9a5a72ead096594c5d59abe706e3716f6000c3b4ebd7690f2eb114a37d1a7db
Tags
chaos ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

f9a5a72ead096594c5d59abe706e3716f6000c3b4ebd7690f2eb114a37d1a7db

Threat Level: Known bad

The file Yashma ransomware builder v1.2.exe was found to be: Known bad.

Malicious Activity Summary

chaos ransomware

Chaos Ransomware

Chaos

Chaos family

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Modifies registry class

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Privilege Escalation
TA0004
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-24 10:38

Signatures

Chaos Ransomware

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

Chaos family

chaos

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-24 10:38

Reported

2024-06-24 10:45

Platform

win10-20240404-en

Max time kernel

364s

Max time network

390s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe"

Signatures

Chaos

ransomware chaos

Chaos Ransomware

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

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0 C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (int) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\NodeSlot = "1" C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\1\Shell C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0 = 14001f50e04fd020ea3a6910a2d808002b30309d0000 C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0 C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = 00000000ffffffff C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0 = 14002e80922b16d365937a46956b92703aca08af0000 C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 02 C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\MRUListEx = ffffffff C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\1 C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\MRUListEx = 00000000ffffffff C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\1\Shell\SniffedFolderType = "Documents" C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe

"C:\Users\Admin\AppData\Local\Temp\Yashma ransomware builder v1.2.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 28.173.189.20.in-addr.arpa udp
US 8.8.8.8:53 80.90.14.23.in-addr.arpa udp

Files

memory/4924-0-0x0000000000F20000-0x0000000000FAC000-memory.dmp

memory/4924-1-0x00007FFFABA43000-0x00007FFFABA44000-memory.dmp

memory/4924-2-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-3-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-4-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-5-0x00007FFFABA43000-0x00007FFFABA44000-memory.dmp

memory/4924-6-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-7-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-12-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-13-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

memory/4924-16-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp