quasar | 4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

General

Target

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
Size

2.8MB
MD5

fcf74d4566afb934f07dd834f808c91a
SHA1

40ca32e4a614421f6af5afadf51d1cce1a0c64d3
SHA256

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b
SHA512

54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585
SSDEEP

6144:De40VFabAt0nvrzCy1GdWEufANJoXiEmJARab8rK5AzVvjn/qK/k8eEJaQXHIQJG:De3Fab

Score

10^/10

quasar retards persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Retards

C2

192.227.223.11:7707

Mutex

QSR_MUTEX_f16UjmYVpgK3aDIQD0

Attributes

encryption_key
76BTYMCCLlIx8oiGPHIG
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
WindowsWMI
subdirectory
SubDir

Signatures

Quasar RAT 4 IoCs

Quasar is an open source Remote Access Tool.

trojan spyware quasar

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe

flow	ioc
12	ip-api.com
21	api.ipify.org
37	api.ipify.org
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4724-140-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

Processes:

Client.exeClient.exe

pid process

5064 Client.exe
1732 Client.exe

pid	process
5064	Client.exe
1732	Client.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exeClient.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	Client.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsWMI = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe\""	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe

Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

12 ip-api.com
21 api.ipify.org
37 api.ipify.org

flow	ioc
12	ip-api.com
21	api.ipify.org
37	api.ipify.org

Suspicious use of NtSetInformationThreadHideFromDebugger 24 IoCs

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exeClient.exe

pid	process
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exeClient.exe

description	pid	process	target process
PID 2772 set thread context of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 5064 set thread context of 1732	5064	Client.exe	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
1852	2772	WerFault.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2804	5064	WerFault.exe	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
T1053

Processes:

schtasks.exeschtasks.exe

pid process

4012 schtasks.exe
3456 schtasks.exe
Delays execution with timeout.exe 2 IoCs
evasion

Processes:

timeout.exetimeout.exe

pid process

4764 timeout.exe
3292 timeout.exe

pid	process
4012	schtasks.exe
3456	schtasks.exe

pid	process
4764	timeout.exe
3292	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exeClient.exe

pid	process
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
5064	Client.exe
5064	Client.exe
5064	Client.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exeClient.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
Token: SeDebugPrivilege	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
Token: SeDebugPrivilege	5064	Client.exe
Token: SeDebugPrivilege	1732	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1732 Client.exe

pid	process
1732	Client.exe

Suspicious use of WriteProcessMemory 37 IoCs

Processes:

4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.execmd.exe4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exeClient.execmd.exeClient.exe

description	pid	process	target process
PID 2772 wrote to memory of 4160	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	cmd.exe
PID 2772 wrote to memory of 4160	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	cmd.exe
PID 2772 wrote to memory of 4160	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	cmd.exe
PID 4160 wrote to memory of 4764	4160	cmd.exe	timeout.exe
PID 4160 wrote to memory of 4764	4160	cmd.exe	timeout.exe
PID 4160 wrote to memory of 4764	4160	cmd.exe	timeout.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 2772 wrote to memory of 4724	2772	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
PID 4724 wrote to memory of 4012	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	schtasks.exe
PID 4724 wrote to memory of 4012	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	schtasks.exe
PID 4724 wrote to memory of 4012	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	schtasks.exe
PID 4724 wrote to memory of 5064	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	Client.exe
PID 4724 wrote to memory of 5064	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	Client.exe
PID 4724 wrote to memory of 5064	4724	4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe	Client.exe
PID 5064 wrote to memory of 320	5064	Client.exe	cmd.exe
PID 5064 wrote to memory of 320	5064	Client.exe	cmd.exe
PID 5064 wrote to memory of 320	5064	Client.exe	cmd.exe
PID 320 wrote to memory of 3292	320	cmd.exe	timeout.exe
PID 320 wrote to memory of 3292	320	cmd.exe	timeout.exe
PID 320 wrote to memory of 3292	320	cmd.exe	timeout.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 5064 wrote to memory of 1732	5064	Client.exe	Client.exe
PID 1732 wrote to memory of 3456	1732	Client.exe	schtasks.exe
PID 1732 wrote to memory of 3456	1732	Client.exe	schtasks.exe
PID 1732 wrote to memory of 3456	1732	Client.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
"C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe"
1⤵
- Quasar RAT
- Checks computer location settings
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2772

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout 1
2⤵
- Suspicious use of WriteProcessMemory
PID:4160

C:\Windows\SysWOW64\timeout.exe
timeout 1
3⤵
- Delays execution with timeout.exe
PID:4764

C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe
"C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe"
2⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4724

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "WindowsWMI" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4012

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5064

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout 1
4⤵
- Suspicious use of WriteProcessMemory
PID:320

C:\Windows\SysWOW64\timeout.exe
timeout 1
5⤵
- Delays execution with timeout.exe
PID:3292

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:1732

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "WindowsWMI" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3456

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 5064 -s 1104
4⤵
- Program crash
PID:2804

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2772 -s 1528
2⤵
- Program crash
PID:1852

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2772 -ip 2772
1⤵
PID:4112

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 5064 -ip 5064
1⤵
PID:1832

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
2.8MB

MD5
fcf74d4566afb934f07dd834f808c91a

SHA1
40ca32e4a614421f6af5afadf51d1cce1a0c64d3

SHA256
4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

SHA512
54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
2.8MB

MD5
fcf74d4566afb934f07dd834f808c91a

SHA1
40ca32e4a614421f6af5afadf51d1cce1a0c64d3

SHA256
4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

SHA512
54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
2.8MB

MD5
fcf74d4566afb934f07dd834f808c91a

SHA1
40ca32e4a614421f6af5afadf51d1cce1a0c64d3

SHA256
4ab5809ad43e54f714e728a03b085a38c2d94c918d5f65404983d4a367f07f8b

SHA512
54000e92b69597b158ca3f7c65e49fc705f8439e34092abf7b6df6c085d02343f339be6ad22c784a2f23dcea73b7252d8dd589618faf20a9d8c085ae54c81585

Download Submit
memory/320-147-0x0000000000000000-mapping.dmp

Download
memory/1732-149-0x0000000000000000-mapping.dmp

Download
memory/2772-133-0x00000000053B0000-0x000000000544C000-memory.dmp

Filesize
624KB

Download
memory/2772-134-0x0000000005B00000-0x00000000060A4000-memory.dmp

Filesize
5.6MB

Download
memory/2772-135-0x00000000055F0000-0x0000000005682000-memory.dmp

Filesize
584KB

Download
memory/2772-136-0x0000000005360000-0x000000000536A000-memory.dmp

Filesize
40KB

Download
memory/2772-132-0x0000000000750000-0x0000000000A2A000-memory.dmp

Filesize
2.9MB

Download
memory/3292-148-0x0000000000000000-mapping.dmp

Download
memory/3456-152-0x0000000000000000-mapping.dmp

Download
memory/4012-143-0x0000000000000000-mapping.dmp

Download
memory/4160-137-0x0000000000000000-mapping.dmp

Download
memory/4724-142-0x00000000062F0000-0x0000000006302000-memory.dmp

Filesize
72KB

Download
memory/4724-141-0x0000000005720000-0x0000000005786000-memory.dmp

Filesize
408KB

Download
memory/4724-140-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/4724-139-0x0000000000000000-mapping.dmp

Download
memory/4764-138-0x0000000000000000-mapping.dmp

Download
memory/5064-144-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads