quasar | 1e8520858b228d7d7e60985b90089e0223a69c5118a7029b10658177dcb4709b

General

Target

Client-built.exe
Size

3.1MB
MD5

feb24955d3504654b50393efdafde20d
SHA1

3e43172200820307c71d2885a94d4f40efd5cda7
SHA256

6f732f4a61ca68e185972687c1ecd6a2fed2b25bea11dd81bb9c5d8f0e471bce
SHA512

1547189a9a14f4fe7313d2bf07218c52b88128ca66d704ce0cb1ad1f529af6c87192c2f2f639f00718ed21cab5b0ebb14416e24c9b77c129ae54026de8f9b1fd
SSDEEP

49152:Uv0iiN2tPa2vpJPylxhhC25D/Wv1zZLljFuvJmYoGdk/4THHB72eh2NT:Uv/q2tPa2vpJPylxhhz5D/WNjFAU

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.104:4782

192.168.1.104:50133

127.0.0.1:6000

DESKTOP-9IMIHQU:49736

127.0.0.1:4782

127.0.07.1:50133

192.168.1.104:6000

Mutex

03bae1e9-f5dc-4e0e-94fb-62a44e846020

Attributes

encryption_key
1BDF94B25EA282E8D3B48C8D6810CDDC133AFA4C
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2340-1-0x0000000000120000-0x0000000000444000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2904-8-0x00000000012A0000-0x00000000015C4000-memory.dmp	family_quasar

Executes dropped EXE 3 IoCs

Processes:

Client.exeClient.exeClient.exe

pid process

2904 Client.exe
1352 Client.exe
1872 Client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid process

1944 schtasks.exe
1148 schtasks.exe
1692 schtasks.exe
2564 schtasks.exe
Runs ping.exe 1 TTPs 2 IoCs

Remote System Discovery
T1018

Processes:

PING.EXEPING.EXE

pid process

2004 PING.EXE
1108 PING.EXE

pid	process
2904	Client.exe
1352	Client.exe
1872	Client.exe

pid	process
1944	schtasks.exe
1148	schtasks.exe
1692	schtasks.exe
2564	schtasks.exe

pid	process
2004	PING.EXE
1108	PING.EXE

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

Client-built.exeClient.exeClient.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2340	Client-built.exe
Token: SeDebugPrivilege	2904	Client.exe
Token: SeDebugPrivilege	1352	Client.exe
Token: SeDebugPrivilege	1872	Client.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

Client.exeClient.exeClient.exe

pid process

2904 Client.exe
1352 Client.exe
1872 Client.exe

pid	process
2904	Client.exe
1352	Client.exe
1872	Client.exe

Suspicious use of WriteProcessMemory 39 IoCs

Processes:

Client-built.exeClient.execmd.exeClient.execmd.exeClient.exe

description	pid	process	target process
PID 2340 wrote to memory of 1692	2340	Client-built.exe	schtasks.exe
PID 2340 wrote to memory of 1692	2340	Client-built.exe	schtasks.exe
PID 2340 wrote to memory of 1692	2340	Client-built.exe	schtasks.exe
PID 2340 wrote to memory of 2904	2340	Client-built.exe	Client.exe
PID 2340 wrote to memory of 2904	2340	Client-built.exe	Client.exe
PID 2340 wrote to memory of 2904	2340	Client-built.exe	Client.exe
PID 2904 wrote to memory of 2564	2904	Client.exe	schtasks.exe
PID 2904 wrote to memory of 2564	2904	Client.exe	schtasks.exe
PID 2904 wrote to memory of 2564	2904	Client.exe	schtasks.exe
PID 2904 wrote to memory of 1452	2904	Client.exe	cmd.exe
PID 2904 wrote to memory of 1452	2904	Client.exe	cmd.exe
PID 2904 wrote to memory of 1452	2904	Client.exe	cmd.exe
PID 1452 wrote to memory of 2136	1452	cmd.exe	chcp.com
PID 1452 wrote to memory of 2136	1452	cmd.exe	chcp.com
PID 1452 wrote to memory of 2136	1452	cmd.exe	chcp.com
PID 1452 wrote to memory of 2004	1452	cmd.exe	PING.EXE
PID 1452 wrote to memory of 2004	1452	cmd.exe	PING.EXE
PID 1452 wrote to memory of 2004	1452	cmd.exe	PING.EXE
PID 1452 wrote to memory of 1352	1452	cmd.exe	Client.exe
PID 1452 wrote to memory of 1352	1452	cmd.exe	Client.exe
PID 1452 wrote to memory of 1352	1452	cmd.exe	Client.exe
PID 1352 wrote to memory of 1944	1352	Client.exe	schtasks.exe
PID 1352 wrote to memory of 1944	1352	Client.exe	schtasks.exe
PID 1352 wrote to memory of 1944	1352	Client.exe	schtasks.exe
PID 1352 wrote to memory of 536	1352	Client.exe	cmd.exe
PID 1352 wrote to memory of 536	1352	Client.exe	cmd.exe
PID 1352 wrote to memory of 536	1352	Client.exe	cmd.exe
PID 536 wrote to memory of 2600	536	cmd.exe	chcp.com
PID 536 wrote to memory of 2600	536	cmd.exe	chcp.com
PID 536 wrote to memory of 2600	536	cmd.exe	chcp.com
PID 536 wrote to memory of 1108	536	cmd.exe	PING.EXE
PID 536 wrote to memory of 1108	536	cmd.exe	PING.EXE
PID 536 wrote to memory of 1108	536	cmd.exe	PING.EXE
PID 536 wrote to memory of 1872	536	cmd.exe	Client.exe
PID 536 wrote to memory of 1872	536	cmd.exe	Client.exe
PID 536 wrote to memory of 1872	536	cmd.exe	Client.exe
PID 1872 wrote to memory of 1148	1872	Client.exe	schtasks.exe
PID 1872 wrote to memory of 1148	1872	Client.exe	schtasks.exe
PID 1872 wrote to memory of 1148	1872	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-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2340

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
2⤵
- Creates scheduled task(s)
PID:1692

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2904

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
3⤵
- Creates scheduled task(s)
PID:2564

C:\Windows\system32\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\aM9045fcLdjb.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:1452

C:\Windows\system32\chcp.com
chcp 65001
4⤵
PID:2136

C:\Windows\system32\PING.EXE
ping -n 10 localhost
4⤵
- Runs ping.exe
PID:2004

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1352

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
5⤵
- Creates scheduled task(s)
PID:1944

C:\Windows\system32\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\oHjzPNObDg3i.bat" "
5⤵
- Suspicious use of WriteProcessMemory
PID:536

C:\Windows\system32\chcp.com
chcp 65001
6⤵
PID:2600

C:\Windows\system32\PING.EXE
ping -n 10 localhost
6⤵
- Runs ping.exe
PID:1108

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
6⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1872

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
7⤵
- Creates scheduled task(s)
PID:1148

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

System Information Discovery

1

T1082

Remote System Discovery

1

T1018

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\aM9045fcLdjb.bat
Filesize
207B

MD5
947f39b2234f1d801c2f1d30e2a1ed5e

SHA1
378748f7503f84d36363fe3c9ca3041d161818ab

SHA256
233772c79f8b83a4b90d2d6e51b5d3b1183f38ecdcc7eac9029085ca7542bab5

SHA512
267a3a2df2bd015845c8e20b72dd96ceb94d90ce016ef7ea9b24874ae9cee170a252e84e370ccf88a6e8353c5bb1f06ddc091bd4176d8455c24a778e1cf8e600

Download Submit
C:\Users\Admin\AppData\Local\Temp\oHjzPNObDg3i.bat
Filesize
207B

MD5
f4e32a20d919296d07420a6c5e32848e

SHA1
fc2e9e681fa9c49c3e6c6f8a11ce49346de6128a

SHA256
60f31b59df7b1f01c5c7800845e1efaddeb5c1b9b2ab39ac625bceadd3261bf5

SHA512
781aae9ab3a42e5b7e7b5c1dd95184d3d5305b85def850ffff7b4f41fb08bb1a9b7fe343f83419c189021bac4079ced2b36109d02bf6bf9804c17d7876d22e8f

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
3.1MB

MD5
feb24955d3504654b50393efdafde20d

SHA1
3e43172200820307c71d2885a94d4f40efd5cda7

SHA256
6f732f4a61ca68e185972687c1ecd6a2fed2b25bea11dd81bb9c5d8f0e471bce

SHA512
1547189a9a14f4fe7313d2bf07218c52b88128ca66d704ce0cb1ad1f529af6c87192c2f2f639f00718ed21cab5b0ebb14416e24c9b77c129ae54026de8f9b1fd

Download Submit
memory/2340-0-0x000007FEF5BA3000-0x000007FEF5BA4000-memory.dmp

Filesize
4KB

Download
memory/2340-1-0x0000000000120000-0x0000000000444000-memory.dmp

Filesize
3.1MB

Download
memory/2340-2-0x000007FEF5BA0000-0x000007FEF658C000-memory.dmp

Filesize
9.9MB

Download
memory/2340-10-0x000007FEF5BA0000-0x000007FEF658C000-memory.dmp

Filesize
9.9MB

Download
memory/2904-8-0x00000000012A0000-0x00000000015C4000-memory.dmp

Filesize
3.1MB

Download
memory/2904-9-0x000007FEF5BA0000-0x000007FEF658C000-memory.dmp

Filesize
9.9MB

Download
memory/2904-11-0x000007FEF5BA0000-0x000007FEF658C000-memory.dmp

Filesize
9.9MB

Download
memory/2904-12-0x000007FEF5BA0000-0x000007FEF658C000-memory.dmp

Filesize
9.9MB

Download
memory/2904-22-0x000007FEF5BA0000-0x000007FEF658C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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