Malware Analysis Report

2024-10-18 23:52

Sample ID 200501-pez84yzjvx
Target rBlbqI2.exe
SHA256 df049efbfa7ac0b76c8daff5d792c550c7a7a24f6e9e887d01a01013c9caa763
Tags
persistence ransomware jigsaw
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 Overview

score
10/10

SHA256

df049efbfa7ac0b76c8daff5d792c550c7a7a24f6e9e887d01a01013c9caa763

Threat Level: Known bad

The file rBlbqI2.exe was found to be: Known bad.

Malicious Activity Summary

persistence ransomware jigsaw

Jigsaw

Executes dropped EXE

Loads dropped DLL

Drops desktop.ini file(s)

Adds Run entry to start application

Drops file in Windows directory

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2020-05-01 14:11

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2020-05-01 14:11

Reported

2020-05-01 14:14

Platform

win7v200430

Max time kernel

35s

Max time network

6s

Command Line

"C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe"

Signatures

Executes dropped EXE

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

Adds Run entry to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-910373003-3952921535-3480519689-1000\Software\Microsoft\Windows\CurrentVersion\Run\firefox.exe = "C:\\Users\\Admin\\AppData\\Roaming\\Frfx\\firefox.exe" C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A

Jigsaw

ransomware jigsaw

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe

"C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe"

C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe

"C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe" C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe

Network

Country Destination Domain Proto
N/A 239.255.255.250:1900 udp
N/A 239.255.255.250:1900 udp
N/A 224.0.0.22 igmp

Files

memory/824-0-0x0000000001FB0000-0x0000000001FC1000-memory.dmp

\Users\Admin\AppData\Local\Drpbx\drpbx.exe

C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe

memory/1500-8-0x0000000001FD0000-0x0000000001FE1000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2020-05-01 14:11

Reported

2020-05-01 14:14

Platform

win10v200430

Max time kernel

128s

Max time network

97s

Command Line

"C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe"

Signatures

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\assembly C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A
File created C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A
File opened for modification C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A

Drops desktop.ini file(s)

Description Indicator Process Target
File created C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A
File opened for modification C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe N/A

Executes dropped EXE

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

Adds Run entry to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1231583446-2617009595-2137880041-1000\Software\Microsoft\Windows\CurrentVersion\Run\firefox.exe = "C:\\Users\\Admin\\AppData\\Roaming\\Frfx\\firefox.exe" C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe N/A

Jigsaw

ransomware jigsaw

Processes

C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe

"C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe"

C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe

"C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe" C:\Users\Admin\AppData\Local\Temp\rBlbqI2.exe

Network

Country Destination Domain Proto
N/A 239.255.255.250:1900 udp
N/A 239.255.255.250:1900 udp
N/A 10.10.0.255:137 udp
N/A 8.8.8.8:53 udp
N/A 52.109.12.19:443 nexusrules.officeapps.live.com tcp
N/A 10.10.0.16:137 udp
N/A 10.10.0.31:137 udp

Files

memory/1356-0-0x0000000002480000-0x0000000002481000-memory.dmp

memory/1356-1-0x0000000002480000-0x0000000002481000-memory.dmp

C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe

C:\Users\Admin\AppData\Local\Drpbx\drpbx.exe

memory/1828-5-0x0000000002330000-0x0000000002331000-memory.dmp