Malware Analysis Report

2025-01-18 04:36

Sample ID 231127-lhmq5aff95
Target Client-built.exe
SHA256 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
Tags
office04 quasar spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63

Threat Level: Known bad

The file Client-built.exe was found to be: Known bad.

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-11-27 09:32

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

2023-11-27 09:32

Reported

2023-11-27 10:02

Platform

win7-20231023-en

Max time kernel

1800s

Max time network

1565s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.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
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\Client.exe N/A

Enumerates physical storage devices

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\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\system32\schtasks.exe

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

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

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

C:\Windows\system32\schtasks.exe

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

Network

Country Destination Domain Proto
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Files

memory/2228-0-0x0000000001100000-0x0000000001424000-memory.dmp

memory/2228-1-0x000007FEF5AA0000-0x000007FEF648C000-memory.dmp

memory/2228-2-0x000000001B3D0000-0x000000001B450000-memory.dmp

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

MD5 b29c8e703911c242f88f9f2d1be23121
SHA1 8adc17f1e94eeb0d95d35825c91b788d70d28de1
SHA256 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
SHA512 4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f

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

MD5 b29c8e703911c242f88f9f2d1be23121
SHA1 8adc17f1e94eeb0d95d35825c91b788d70d28de1
SHA256 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
SHA512 4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f

memory/2572-9-0x00000000010D0000-0x00000000013F4000-memory.dmp

memory/2228-10-0x000007FEF5AA0000-0x000007FEF648C000-memory.dmp

memory/2572-8-0x000007FEF5AA0000-0x000007FEF648C000-memory.dmp

memory/2572-11-0x000000001AC20000-0x000000001ACA0000-memory.dmp

memory/2572-12-0x000007FEF5AA0000-0x000007FEF648C000-memory.dmp

memory/2572-13-0x000000001AC20000-0x000000001ACA0000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-11-27 09:32

Reported

2023-11-27 10:02

Platform

win10v2004-20231023-en

Max time kernel

1800s

Max time network

1161s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.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\Client.exe N/A

Enumerates physical storage devices

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\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\SYSTEM32\schtasks.exe

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

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
N/A 127.0.0.7:5054 tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
US 8.8.8.8:53 81.14.97.104.in-addr.arpa udp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
US 8.8.8.8:53 89.65.42.20.in-addr.arpa udp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
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N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
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N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5053 tcp
N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
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N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5053 tcp
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N/A 127.0.0.7:5054 tcp
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N/A 127.0.0.7:5054 tcp

Files

memory/3696-0-0x0000000000AE0000-0x0000000000E04000-memory.dmp

memory/3696-1-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp

memory/3696-2-0x000000001BBA0000-0x000000001BBB0000-memory.dmp

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

MD5 b29c8e703911c242f88f9f2d1be23121
SHA1 8adc17f1e94eeb0d95d35825c91b788d70d28de1
SHA256 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
SHA512 4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f

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

MD5 b29c8e703911c242f88f9f2d1be23121
SHA1 8adc17f1e94eeb0d95d35825c91b788d70d28de1
SHA256 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
SHA512 4c37427e88f6f17344be909ebfbb33e053a0b999f28230a548f343dbf1081ec511701cf61101eef3c9e99400ab73759050b34a9e973eb8fabf892bb2a886a74f

memory/2956-9-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp

memory/3696-10-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp

memory/2956-11-0x000000001B120000-0x000000001B130000-memory.dmp

memory/2956-12-0x000000001C010000-0x000000001C060000-memory.dmp

memory/2956-13-0x000000001C120000-0x000000001C1D2000-memory.dmp

memory/2956-14-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp

memory/2956-15-0x000000001B120000-0x000000001B130000-memory.dmp