Malware Analysis Report

2024-09-11 01:53

Sample ID 231012-p3xzdaaf6y
Target Decra.exe
SHA256 d981fe00432dc5aa059884558c02276379f4cadbb7054c23962cb71122342b9d
Tags
medusalocker
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

d981fe00432dc5aa059884558c02276379f4cadbb7054c23962cb71122342b9d

Threat Level: Known bad

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

Malicious Activity Summary

medusalocker

Suspicious use of NtCreateUserProcessOtherParentProcess

MedusaLocker payload

Medusalocker family

Enumerates connected drives

Unsigned PE

Suspicious use of WriteProcessMemory

System policy modification

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Privilege Escalation
TA0004
Defense Evasion
TA0005
Modify Registry
T1112
Credential Access
TA0006
Discovery
TA0007
Query Registry
T1012
Peripheral Device Discovery
T1120
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

2023-10-12 12:51

Signatures

MedusaLocker payload

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

Medusalocker family

medusalocker

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2023-10-12 12:51

Reported

2023-10-16 04:29

Platform

win7-20230831-en

Max time kernel

118s

Max time network

121s

Command Line

C:\Windows\Explorer.EXE

Signatures

Suspicious use of NtCreateUserProcessOtherParentProcess

Description Indicator Process Target
PID 2244 created 1192 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\Explorer.EXE

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\V: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\Y: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\H: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\K: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\L: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\T: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\E: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\I: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\R: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\O: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\P: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\W: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\B: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\J: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\M: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\N: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\U: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\X: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\A: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\G: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\Q: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\S: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2244 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2244 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2244 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2244 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2700 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2700 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2700 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2700 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2244 wrote to memory of 2732 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2244 wrote to memory of 2732 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2244 wrote to memory of 2732 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2244 wrote to memory of 2732 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe

System policy modification

evasion
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

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

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

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

\\?\C:\Users\Admin\AppData\Local\Temp\Decra.exe -network

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c pause

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c pause

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2023-10-12 12:51

Reported

2023-10-16 04:29

Platform

win10v2004-20230915-en

Max time kernel

91s

Max time network

155s

Command Line

C:\Windows\Explorer.EXE

Signatures

Suspicious use of NtCreateUserProcessOtherParentProcess

Description Indicator Process Target
PID 4680 created 3160 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\Explorer.EXE

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\M: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\U: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\V: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\W: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\Y: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\I: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\J: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\K: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\P: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\H: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\L: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\N: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\R: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\T: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\B: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\E: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\O: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\S: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\X: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\A: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\G: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
File opened (read-only) \??\Q: C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4680 wrote to memory of 4472 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 4680 wrote to memory of 4472 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 4680 wrote to memory of 4472 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 4472 wrote to memory of 3640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4472 wrote to memory of 3640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4472 wrote to memory of 3640 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4680 wrote to memory of 1472 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4680 wrote to memory of 1472 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4680 wrote to memory of 1472 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe

System policy modification

evasion
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" C:\Users\Admin\AppData\Local\Temp\Decra.exe N/A

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

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

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

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

\\?\C:\Users\Admin\AppData\Local\Temp\Decra.exe -network

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c pause

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c pause

Network

Country Destination Domain Proto
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 8.3.197.209.in-addr.arpa udp
US 8.8.8.8:53 68.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 108.211.229.192.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp

Files

N/A