quasar | ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d

General

Target

Client-buailt.exe
Size

3.3MB
MD5

67058a89ce6f3786bc28af9962d6202d
SHA1

57b66752526058f244ed0802d771b0b4d70432a9
SHA256

ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d
SHA512

98a0cc78d49cba94cc5edd2804697391861cd0192ce10aeb93223ad05046a1418d1380c3a3cd7a1e17f0ab290e0a10cd60d3f0e8959ca4783d2eef7460a8ce62
SSDEEP

49152:qv+I22SsaNYfdPBldt698dBcjHQfnk9hbvJULoGdP7bTHHB72eh2NT/ZqS:qvz22SsaNYfdPBldt6+dBcjHBhA

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

198.7.62.204:4782

192.168.1.1:4782

Mutex

02b9c972-8b55-4d55-b7c4-09a1f00ff400

Attributes

encryption_key
5BF0703F288C43118835CAF4D1A6879C29016FB3
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1160-0-0x0000000000480000-0x00000000007C8000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

756 Client.exe

pid	process
756	Client.exe

Drops file in System32 directory 5 IoCs

Processes:

Client-buailt.exeClient.exe

description	ioc	process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-buailt.exe
File opened for modification	C:\Windows\system32\SubDir	Client-buailt.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	Client-buailt.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1764 schtasks.exe
4988 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-buailt.exeClient.exe

description pid process

Token: SeDebugPrivilege 1160 Client-buailt.exe
Token: SeDebugPrivilege 756 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

756 Client.exe

pid	process
1764	schtasks.exe
4988	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1160	Client-buailt.exe
Token: SeDebugPrivilege	756	Client.exe

pid	process
756	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-buailt.exeClient.exe

description	pid	process	target process
PID 1160 wrote to memory of 1764	1160	Client-buailt.exe	schtasks.exe
PID 1160 wrote to memory of 1764	1160	Client-buailt.exe	schtasks.exe
PID 1160 wrote to memory of 756	1160	Client-buailt.exe	Client.exe
PID 1160 wrote to memory of 756	1160	Client-buailt.exe	Client.exe
PID 756 wrote to memory of 4988	756	Client.exe	schtasks.exe
PID 756 wrote to memory of 4988	756	Client.exe	schtasks.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-buailt.exe
"C:\Users\Admin\AppData\Local\Temp\Client-buailt.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1160

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1764

C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:756

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4988

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=1348 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:8
1⤵
PID:2272

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Windows\System32\SubDir\Client.exe
Filesize
3.3MB

MD5
67058a89ce6f3786bc28af9962d6202d

SHA1
57b66752526058f244ed0802d771b0b4d70432a9

SHA256
ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d

SHA512
98a0cc78d49cba94cc5edd2804697391861cd0192ce10aeb93223ad05046a1418d1380c3a3cd7a1e17f0ab290e0a10cd60d3f0e8959ca4783d2eef7460a8ce62

Download Submit
memory/756-9-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

Filesize
10.8MB

Download
memory/756-11-0x000000001BF30000-0x000000001BF40000-memory.dmp

Filesize
64KB

Download
memory/756-12-0x000000001BE70000-0x000000001BEC0000-memory.dmp

Filesize
320KB

Download
memory/756-13-0x000000001C7F0000-0x000000001C8A2000-memory.dmp

Filesize
712KB

Download
memory/756-14-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

Filesize
10.8MB

Download
memory/1160-0-0x0000000000480000-0x00000000007C8000-memory.dmp

Filesize
3.3MB

Download
memory/1160-1-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

Filesize
10.8MB

Download
memory/1160-2-0x000000001B380000-0x000000001B390000-memory.dmp

Filesize
64KB

Download
memory/1160-10-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads