quasar | 7e0c75a10e45e707e25ff968ddf24cb7ed73fd80ae49a04091a1a51f13bd1fb9

General

Target

Client-built.exe
Size

3.1MB
MD5

c7d2cead872af6fb32edddcf71b5111b
SHA1

7bbdc422948e09751d8fd35d384bc2ed8f6d9eff
SHA256

97b3602ac7222d914c4a8fb116e76582f695c377b6bf5d524489a2dc3ea90d8b
SHA512

822b76495194780a9aa8f6352cb0d1b718c9e2a2c6f9d0f74cde6bc139c7d2959f82f95d2c89b36e7b2890fd3b7fd05a4d139238d1aad9cb6cfc4cbd84ebf015
SSDEEP

49152:dv9zn3r24paQe+GPhlz1Tt6U7PkD6sg3yR2YRAkCKLoGJYjTHHB72eh2NT:dvFr24paQe+GPhlz1TwU7PkDng3yn

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.1:4782

88.98.207.207:4782

192.168.1.211:4782

192.168.0.132:4782

2a01:4b00:b31a:3e00:d4a4:5f88:ab8:cc7d:4782

fd00::1617:c634:9b0b:2a22:4782

2a01:4b00:b31a:3e00:c7a:623f:eb1:3db6:4782

fd00::c7a:623f:eb1:3db6:4782

fe80::19ef:ec1a:f41f:39a5%5:4782

Mutex

6d19d2f9-1235-4b10-a1dd-486dc3edd052

Attributes

encryption_key
12AE26995FE0F312DC3ADA3C8CD142053AD088CA
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/2340-1-0x00000000001E0000-0x0000000000504000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/1616-9-0x0000000001290000-0x00000000015B4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1616 Client.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

2788 schtasks.exe
2348 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2340 Client-built.exe
Token: SeDebugPrivilege 1616 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1616 Client.exe

pid	process
1616	Client.exe

pid	process
2788	schtasks.exe
2348	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2340	Client-built.exe
Token: SeDebugPrivilege	1616	Client.exe

pid	process
1616	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2340 wrote to memory of 2348	2340	Client-built.exe	schtasks.exe
PID 2340 wrote to memory of 2348	2340	Client-built.exe	schtasks.exe
PID 2340 wrote to memory of 2348	2340	Client-built.exe	schtasks.exe
PID 2340 wrote to memory of 1616	2340	Client-built.exe	Client.exe
PID 2340 wrote to memory of 1616	2340	Client-built.exe	Client.exe
PID 2340 wrote to memory of 1616	2340	Client-built.exe	Client.exe
PID 1616 wrote to memory of 2788	1616	Client.exe	schtasks.exe
PID 1616 wrote to memory of 2788	1616	Client.exe	schtasks.exe
PID 1616 wrote to memory of 2788	1616	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:2348

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:1616

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:2788

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

MD5
c7d2cead872af6fb32edddcf71b5111b

SHA1
7bbdc422948e09751d8fd35d384bc2ed8f6d9eff

SHA256
97b3602ac7222d914c4a8fb116e76582f695c377b6bf5d524489a2dc3ea90d8b

SHA512
822b76495194780a9aa8f6352cb0d1b718c9e2a2c6f9d0f74cde6bc139c7d2959f82f95d2c89b36e7b2890fd3b7fd05a4d139238d1aad9cb6cfc4cbd84ebf015

Download Submit
memory/1616-8-0x000007FEF5B80000-0x000007FEF656C000-memory.dmp

Filesize
9.9MB

Download
memory/1616-9-0x0000000001290000-0x00000000015B4000-memory.dmp

Filesize
3.1MB

Download
memory/1616-11-0x000007FEF5B80000-0x000007FEF656C000-memory.dmp

Filesize
9.9MB

Download
memory/1616-12-0x000007FEF5B80000-0x000007FEF656C000-memory.dmp

Filesize
9.9MB

Download
memory/2340-0-0x000007FEF5B83000-0x000007FEF5B84000-memory.dmp

Filesize
4KB

Download
memory/2340-1-0x00000000001E0000-0x0000000000504000-memory.dmp

Filesize
3.1MB

Download
memory/2340-2-0x000007FEF5B80000-0x000007FEF656C000-memory.dmp

Filesize
9.9MB

Download
memory/2340-10-0x000007FEF5B80000-0x000007FEF656C000-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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