Malware Analysis Report

2024-08-06 11:30

Sample ID 240611-cwbfks1fjp
Target file.exe
SHA256 7402de539089b009b82d0d643d7b78234c792407d18ab99fd68de78493dede31
Tags
vcruntime140 quasar spyware trojan
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

7402de539089b009b82d0d643d7b78234c792407d18ab99fd68de78493dede31

Threat Level: Known bad

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

Malicious Activity Summary

vcruntime140 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

Creates scheduled task(s)

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Scheduled Task/Job
T1053
Persistence
TA0003
Scheduled Task/Job
T1053
Privilege Escalation
TA0004
Scheduled Task/Job
T1053
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-11 02:25

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: behavioral1

Detonation Overview

Submitted

2024-06-11 02:25

Reported

2024-06-11 02:27

Platform

win7-20240215-en

Max time kernel

125s

Max time network

135s

Command Line

"C:\Users\Admin\AppData\Local\Temp\file.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:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe N/A

Creates scheduled task(s)

persistence
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\file.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2072 wrote to memory of 2996 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Windows\system32\schtasks.exe
PID 2072 wrote to memory of 2996 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Windows\system32\schtasks.exe
PID 2072 wrote to memory of 2996 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Windows\system32\schtasks.exe
PID 2072 wrote to memory of 1504 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe
PID 2072 wrote to memory of 1504 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe
PID 2072 wrote to memory of 1504 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe
PID 1504 wrote to memory of 2504 N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe C:\Windows\system32\schtasks.exe
PID 1504 wrote to memory of 2504 N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe C:\Windows\system32\schtasks.exe
PID 1504 wrote to memory of 2504 N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "vcruntime140" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe

"C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "vcruntime140" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp

Files

memory/2072-0-0x000007FEF5C93000-0x000007FEF5C94000-memory.dmp

memory/2072-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp

memory/2072-2-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe

MD5 cded3e935b1541f8e930f07e8829f551
SHA1 e7fc4bc9525e5b04b6877ed362ecfcec83fa2d8c
SHA256 7402de539089b009b82d0d643d7b78234c792407d18ab99fd68de78493dede31
SHA512 dd979da2ee725fcdb49a094617fd8e41a283f3dbd809fd939c009ff5609a29e0042be7c6d92cf30c1219b0a9d56ee406a865d1e32ef5b56fdc1f3580bce83d05

memory/1504-8-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

memory/2072-9-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

memory/1504-10-0x0000000000FF0000-0x0000000001314000-memory.dmp

memory/1504-11-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

memory/1504-12-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-11 02:25

Reported

2024-06-11 02:27

Platform

win10v2004-20240226-en

Max time kernel

142s

Max time network

155s

Command Line

"C:\Users\Admin\AppData\Local\Temp\file.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:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe N/A

Creates scheduled task(s)

persistence
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\file.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3544 wrote to memory of 4596 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3544 wrote to memory of 4596 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3544 wrote to memory of 5552 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe
PID 3544 wrote to memory of 5552 N/A C:\Users\Admin\AppData\Local\Temp\file.exe C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe
PID 5552 wrote to memory of 4572 N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5552 wrote to memory of 4572 N/A C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe C:\Windows\SYSTEM32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "vcruntime140" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe

"C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "vcruntime140" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe" /rl HIGHEST /f

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1324 --field-trial-handle=2280,i,1836084024518340990,18250262151825427757,262144 --variations-seed-version /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
N/A 192.168.178.57:4782 tcp
GB 142.250.187.202:443 tcp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp
US 8.8.8.8:53 10.160.77.104.in-addr.arpa udp
N/A 192.168.178.57:4782 tcp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
N/A 192.168.178.57:4782 tcp
N/A 192.168.178.57:4782 tcp
US 8.8.8.8:53 10.179.89.13.in-addr.arpa udp

Files

memory/3544-0-0x00007FFD84573000-0x00007FFD84575000-memory.dmp

memory/3544-1-0x0000000000E10000-0x0000000001134000-memory.dmp

memory/3544-2-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\vcruntime140.exe

MD5 cded3e935b1541f8e930f07e8829f551
SHA1 e7fc4bc9525e5b04b6877ed362ecfcec83fa2d8c
SHA256 7402de539089b009b82d0d643d7b78234c792407d18ab99fd68de78493dede31
SHA512 dd979da2ee725fcdb49a094617fd8e41a283f3dbd809fd939c009ff5609a29e0042be7c6d92cf30c1219b0a9d56ee406a865d1e32ef5b56fdc1f3580bce83d05

memory/5552-9-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

memory/5552-11-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

memory/3544-10-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

memory/5552-12-0x000000001B650000-0x000000001B6A0000-memory.dmp

memory/5552-13-0x000000001C2A0000-0x000000001C352000-memory.dmp

memory/5552-14-0x00007FFD84570000-0x00007FFD85031000-memory.dmp

memory/5552-15-0x00007FFD84570000-0x00007FFD85031000-memory.dmp