quasar | 17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

General

Target

tmp.exe
Size

502KB
MD5

3630b92ac5ed33de5eb53b563913bb02
SHA1

34828f9a66c2c9c0f0cf93419dc96a62bfea476b
SHA256

17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f
SHA512

034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b
SSDEEP

12288:dTEgdfYjbg+qBTaa4EywIGpYR1MIwcdD:+UwzgXywIGpYR6IwcdD

Score

10^/10

quasar office05 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office05

C2

needforrat.hopto.org:7771

Mutex

d70dba78-082d-4d62-9d71-b4a1c6961022

Attributes

encryption_key
110272D9471BA005C613D451E07D98ABB8403AED
install_name
Client1.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender
subdirectory
SubDir

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1924-54-0x0000000000360000-0x00000000003E4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe	family_quasar
behavioral1/memory/760-60-0x0000000000930000-0x00000000009B4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client1.exe

pid process

760 Client1.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 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exe

pid process

912 schtasks.exe
1156 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

tmp.exeClient1.exe

description pid process

Token: SeDebugPrivilege 1924 tmp.exe
Token: SeDebugPrivilege 760 Client1.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client1.exe

pid process

760 Client1.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client1.exe

pid process

760 Client1.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client1.exe

pid process

760 Client1.exe

pid	process
760	Client1.exe

pid	process
912	schtasks.exe
1156	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1924	tmp.exe
Token: SeDebugPrivilege	760	Client1.exe

pid	process
760	Client1.exe

pid	process
760	Client1.exe

pid	process
760	Client1.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

tmp.exeClient1.exe

description	pid	process	target process
PID 1924 wrote to memory of 912	1924	tmp.exe	schtasks.exe
PID 1924 wrote to memory of 912	1924	tmp.exe	schtasks.exe
PID 1924 wrote to memory of 912	1924	tmp.exe	schtasks.exe
PID 1924 wrote to memory of 760	1924	tmp.exe	Client1.exe
PID 1924 wrote to memory of 760	1924	tmp.exe	Client1.exe
PID 1924 wrote to memory of 760	1924	tmp.exe	Client1.exe
PID 760 wrote to memory of 1156	760	Client1.exe	schtasks.exe
PID 760 wrote to memory of 1156	760	Client1.exe	schtasks.exe
PID 760 wrote to memory of 1156	760	Client1.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\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1924

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\tmp.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:912

C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:760

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:1156

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe
Filesize
502KB

MD5
3630b92ac5ed33de5eb53b563913bb02

SHA1
34828f9a66c2c9c0f0cf93419dc96a62bfea476b

SHA256
17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

SHA512
034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client1.exe
Filesize
502KB

MD5
3630b92ac5ed33de5eb53b563913bb02

SHA1
34828f9a66c2c9c0f0cf93419dc96a62bfea476b

SHA256
17473731182bcea4cee088d78f802ea947926a5cbc8708b4ba31d7585ee8b19f

SHA512
034d8e4509816f18f2f75996914d9ef179985a5d53e002b982e208030d2b60413faec917ad6ac1e02f609261d57bb88221c7840271ab64f3cc0b54e3c2b5501b

Download Submit
memory/760-60-0x0000000000930000-0x00000000009B4000-memory.dmp

Filesize
528KB

Download
memory/760-61-0x000000001AEC0000-0x000000001AF40000-memory.dmp

Filesize
512KB

Download
memory/760-62-0x000000001AEC0000-0x000000001AF40000-memory.dmp

Filesize
512KB

Download
memory/1924-54-0x0000000000360000-0x00000000003E4000-memory.dmp

Filesize
528KB

Download
memory/1924-55-0x00000000002D0000-0x0000000000350000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads