Malware Analysis Report

2024-10-19 08:36

Sample ID 240729-vklraazdjr
Target 031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104
SHA256 031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104
Tags
quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104

Threat Level: Known bad

The file 031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104 was found to be: Known bad.

Malicious Activity Summary

quasar office04 spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-29 17:02

Signatures

Quasar family

quasar

Quasar payload

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

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-29 17:02

Reported

2024-07-29 17:06

Platform

win10v2004-20240709-en

Max time kernel

140s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Executes dropped EXE

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

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
File opened for modification C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
File opened for modification C:\Windows\system32\SubDir C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
File opened for modification C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Windows\system32\SubDir\sigmaexecutor.exe.exe N/A
File opened for modification C:\Windows\system32\SubDir C:\Windows\system32\SubDir\sigmaexecutor.exe.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\system32\SubDir\sigmaexecutor.exe.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe

"C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "WIndows Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\sigmaexecutor.exe.exe" /rl HIGHEST /f

C:\Windows\system32\SubDir\sigmaexecutor.exe.exe

"C:\Windows\system32\SubDir\sigmaexecutor.exe.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "WIndows Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\sigmaexecutor.exe.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
N/A 192.168.1.70:4782 tcp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
N/A 192.168.1.70:4782 tcp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 138.201.86.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
N/A 192.168.1.70:4782 tcp
US 8.8.8.8:53 21.58.20.217.in-addr.arpa udp
N/A 192.168.1.70:4782 tcp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
N/A 192.168.1.70:4782 tcp
N/A 192.168.1.70:4782 tcp
US 8.8.8.8:53 13.179.89.13.in-addr.arpa udp

Files

memory/2244-0-0x00007FFDF3423000-0x00007FFDF3425000-memory.dmp

memory/2244-1-0x00000000003D0000-0x00000000006F4000-memory.dmp

memory/2244-2-0x00007FFDF3420000-0x00007FFDF3EE1000-memory.dmp

C:\Windows\System32\SubDir\sigmaexecutor.exe.exe

MD5 9a4f3b0223e0bcb90d5a08afdae6a169
SHA1 b8ea3a64121a47f7a7abc73fc9a39d912b31a724
SHA256 031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104
SHA512 38ab6b70078807bc8c56f5c004ae4ef4a40690ec26bc896213a158765530caec5812b556a5555037ac986175fb1d4d588f1a982dd5e383a8c5734783507f6601

memory/1268-10-0x00007FFDF3420000-0x00007FFDF3EE1000-memory.dmp

memory/2244-9-0x00007FFDF3420000-0x00007FFDF3EE1000-memory.dmp

memory/1268-11-0x00007FFDF3420000-0x00007FFDF3EE1000-memory.dmp

memory/1268-12-0x000000001C000000-0x000000001C050000-memory.dmp

memory/1268-13-0x000000001C110000-0x000000001C1C2000-memory.dmp

memory/1268-14-0x00007FFDF3420000-0x00007FFDF3EE1000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-29 17:02

Reported

2024-07-29 17:05

Platform

win7-20240704-en

Max time kernel

125s

Max time network

141s

Command Line

"C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Executes dropped EXE

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

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
File opened for modification C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
File opened for modification C:\Windows\system32\SubDir C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
File opened for modification C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Windows\system32\SubDir\sigmaexecutor.exe.exe N/A
File opened for modification C:\Windows\system32\SubDir C:\Windows\system32\SubDir\sigmaexecutor.exe.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A
N/A N/A C:\Windows\system32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\system32\SubDir\sigmaexecutor.exe.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2308 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe C:\Windows\system32\schtasks.exe
PID 2308 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe C:\Windows\system32\schtasks.exe
PID 2308 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe C:\Windows\system32\schtasks.exe
PID 2308 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe C:\Windows\system32\SubDir\sigmaexecutor.exe.exe
PID 2308 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe C:\Windows\system32\SubDir\sigmaexecutor.exe.exe
PID 2308 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe C:\Windows\system32\SubDir\sigmaexecutor.exe.exe
PID 2084 wrote to memory of 2252 N/A C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Windows\system32\schtasks.exe
PID 2084 wrote to memory of 2252 N/A C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Windows\system32\schtasks.exe
PID 2084 wrote to memory of 2252 N/A C:\Windows\system32\SubDir\sigmaexecutor.exe.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe

"C:\Users\Admin\AppData\Local\Temp\031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "WIndows Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\sigmaexecutor.exe.exe" /rl HIGHEST /f

C:\Windows\system32\SubDir\sigmaexecutor.exe.exe

"C:\Windows\system32\SubDir\sigmaexecutor.exe.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "WIndows Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\sigmaexecutor.exe.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.1.70:4782 tcp
N/A 192.168.1.70:4782 tcp
N/A 192.168.1.70:4782 tcp
N/A 192.168.1.70:4782 tcp
N/A 192.168.1.70:4782 tcp
N/A 192.168.1.70:4782 tcp

Files

memory/2308-0-0x000007FEF5DB3000-0x000007FEF5DB4000-memory.dmp

memory/2308-1-0x0000000001290000-0x00000000015B4000-memory.dmp

memory/2308-2-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

C:\Windows\System32\SubDir\sigmaexecutor.exe.exe

MD5 9a4f3b0223e0bcb90d5a08afdae6a169
SHA1 b8ea3a64121a47f7a7abc73fc9a39d912b31a724
SHA256 031b3b1935b0eac9273bafb8b20484be97a1c3f9ea1bb611315042b32168f104
SHA512 38ab6b70078807bc8c56f5c004ae4ef4a40690ec26bc896213a158765530caec5812b556a5555037ac986175fb1d4d588f1a982dd5e383a8c5734783507f6601

memory/2308-9-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

memory/2084-8-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

memory/2084-10-0x0000000000F20000-0x0000000001244000-memory.dmp

memory/2084-11-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp

memory/2084-12-0x000007FEF5DB0000-0x000007FEF679C000-memory.dmp