quasar | f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa

General

Target

Client-built.exe
Size

3.1MB
MD5

ae02283593dc891884170b46eb346a51
SHA1

7fbb3b77f2be8fe31bca479b857d18c421edc75c
SHA256

f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa
SHA512

a57e2643e9dd167bd53596ac8be751cb66f7b28b87462e7fded3ee83fa8c8b962822c217fa27692e1a5252e1e862bbb758bf42e3fc8aac755019670fbdb5b66a
SSDEEP

98304:ovxL26AaNeWgPhlmVqkQ7XSKmBRJ6BweYR:2/4SDEwpR

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

littlebirdyy-26683.portmap.host:26683

Mutex

91a6c51e-b9c8-459f-82b5-8fd3ea82ad14

Attributes

encryption_key
91837990C32A7683311E3E452264F10B98C1534B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Service
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/2360-1-0x0000000001130000-0x000000000145A000-memory.dmp	family_quasar
C:\Program Files\SubDir\Client.exe	family_quasar
behavioral1/memory/2336-8-0x0000000000A30000-0x0000000000D5A000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2336 Client.exe

pid	process
2336	Client.exe

Drops file in Program Files directory 5 IoCs

Processes:

Client-built.exeClient.exe

description	ioc	process
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client.exe
File opened for modification	C:\Program Files\SubDir	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

1964 schtasks.exe
2560 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2360 Client-built.exe
Token: SeDebugPrivilege 2336 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

2336 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

2336 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2336 Client.exe

pid	process
1964	schtasks.exe
2560	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2360	Client-built.exe
Token: SeDebugPrivilege	2336	Client.exe

pid	process
2336	Client.exe

pid	process
2336	Client.exe

pid	process
2336	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2360 wrote to memory of 1964	2360	Client-built.exe	schtasks.exe
PID 2360 wrote to memory of 1964	2360	Client-built.exe	schtasks.exe
PID 2360 wrote to memory of 1964	2360	Client-built.exe	schtasks.exe
PID 2360 wrote to memory of 2336	2360	Client-built.exe	Client.exe
PID 2360 wrote to memory of 2336	2360	Client-built.exe	Client.exe
PID 2360 wrote to memory of 2336	2360	Client-built.exe	Client.exe
PID 2336 wrote to memory of 2560	2336	Client.exe	schtasks.exe
PID 2336 wrote to memory of 2560	2336	Client.exe	schtasks.exe
PID 2336 wrote to memory of 2560	2336	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⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2360

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Microsoft Service" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1964

C:\Program Files\SubDir\Client.exe
"C:\Program Files\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2336

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Microsoft Service" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2560

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
ae02283593dc891884170b46eb346a51

SHA1
7fbb3b77f2be8fe31bca479b857d18c421edc75c

SHA256
f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa

SHA512
a57e2643e9dd167bd53596ac8be751cb66f7b28b87462e7fded3ee83fa8c8b962822c217fa27692e1a5252e1e862bbb758bf42e3fc8aac755019670fbdb5b66a

Download Submit
memory/2336-9-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

Filesize
9.9MB

Download
memory/2336-8-0x0000000000A30000-0x0000000000D5A000-memory.dmp

Filesize
3.2MB

Download
memory/2336-11-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

Filesize
9.9MB

Download
memory/2336-12-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-0-0x000007FEF5C93000-0x000007FEF5C94000-memory.dmp

Filesize
4KB

Download
memory/2360-1-0x0000000001130000-0x000000000145A000-memory.dmp

Filesize
3.2MB

Download
memory/2360-2-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-10-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads