Malware Analysis Report

2024-09-11 01:52

Sample ID 230919-qcfg3sbb67
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: behavioral3

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

MedusaLocker payload

Medusalocker family

Suspicious use of NtCreateUserProcessOtherParentProcess

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

2023-09-19 13:06

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

2023-09-19 13:06

Reported

2023-09-19 13:09

Platform

win7-20230831-en

Max time kernel

119s

Max time network

122s

Command Line

C:\Windows\Explorer.EXE

Signatures

Suspicious use of NtCreateUserProcessOtherParentProcess

Description Indicator Process Target
PID 2108 created 1244 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) \??\Q: 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) \??\S: 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) \??\B: 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) \??\L: 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) \??\T: 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) \??\E: 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) \??\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) \??\Z: 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) \??\G: 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) \??\O: 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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2108 wrote to memory of 2200 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2108 wrote to memory of 2200 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2108 wrote to memory of 2200 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2108 wrote to memory of 2200 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2200 wrote to memory of 1368 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2200 wrote to memory of 1368 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2200 wrote to memory of 1368 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2200 wrote to memory of 1368 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2108 wrote to memory of 2136 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2108 wrote to memory of 2136 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2108 wrote to memory of 2136 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2108 wrote to memory of 2136 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

2023-09-19 13:06

Reported

2023-09-19 13:09

Platform

win10-20230915-en

Max time kernel

121s

Max time network

126s

Command Line

C:\Windows\Explorer.EXE

Signatures

Suspicious use of NtCreateUserProcessOtherParentProcess

Description Indicator Process Target
PID 2336 created 3248 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) \??\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) \??\M: 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) \??\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) \??\H: 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) \??\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) \??\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) \??\P: 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) \??\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
File opened (read-only) \??\Y: 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) \??\G: 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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2336 wrote to memory of 2180 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2336 wrote to memory of 2180 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2336 wrote to memory of 2180 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 2180 wrote to memory of 1768 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2180 wrote to memory of 1768 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2180 wrote to memory of 1768 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2336 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2336 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 2336 wrote to memory of 3592 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe

System policy modification

evasion
Description Indicator Process Target
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
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System 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 48.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 15.173.189.20.in-addr.arpa udp

Files

N/A

Analysis: behavioral3

Detonation Overview

Submitted

2023-09-19 13:06

Reported

2023-09-19 13:09

Platform

win10v2004-20230915-en

Max time kernel

142s

Max time network

150s

Command Line

C:\Windows\Explorer.EXE

Signatures

Suspicious use of NtCreateUserProcessOtherParentProcess

Description Indicator Process Target
PID 4376 created 3168 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) \??\I: 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) \??\T: 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) \??\K: 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) \??\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) \??\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) \??\P: 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) \??\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) \??\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) \??\G: 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) \??\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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4376 wrote to memory of 3856 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 4376 wrote to memory of 3856 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 4376 wrote to memory of 3856 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Users\Admin\AppData\Local\Temp\Decra.exe
PID 3856 wrote to memory of 1296 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 3856 wrote to memory of 1296 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 3856 wrote to memory of 1296 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4376 wrote to memory of 3312 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4376 wrote to memory of 3312 N/A C:\Users\Admin\AppData\Local\Temp\Decra.exe C:\Windows\SysWOW64\cmd.exe
PID 4376 wrote to memory of 3312 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 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 126.24.238.8.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 199.111.78.13.in-addr.arpa udp

Files

N/A