quasar | f1360aa4d9adeff9ccff753f2996be1b827d7bc3a79549cc6635346ce3eb1da2

General

Target

Client-built.exe
Size

3.1MB
MD5

bb7a42f4595499e4cd801eacb252cae8
SHA1

bd19e59cd8203d29fa232ea026189d245e07e886
SHA256

f1360aa4d9adeff9ccff753f2996be1b827d7bc3a79549cc6635346ce3eb1da2
SHA512

29f160c2a84e8b3dd86ba62e65e8d91d782f7b347900eb72198012af40353986e2ce01a85cbf288a6146192cdb12450e0ec72024a675509ee6c9e6d089bb2449
SSDEEP

49152:mvRuf2NUaNmwzPWlvdaKM7ZxTwkQRJ6FbR3LoGd/ITHHB72eh2NT:mvsf2NUaNmwzPWlvdaB7ZxTwkQRJ6X

Score

10^/10

quasar slave spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Slave

C2

140.238.91.110:38899

uk2.localto.net:38899:38899

Mutex

276d9dc6-b19c-4958-8ac3-89586bd3b515

Attributes

encryption_key
ABCF70C37D1A79A01712038122D1532DF20DF72A
install_name
Client.exe
log_directory
Error Logs
reconnect_delay
3000
startup_key
WOS64
subdirectory
Windows

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4980-0-0x0000000000C30000-0x0000000000F54000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\Windows\Client.exe	family_quasar

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

Client.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation Client.exe
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1072 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 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

3328 schtasks.exe
4832 schtasks.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

1472 PING.EXE
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 4980 Client-built.exe
Token: SeDebugPrivilege 1072 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1072 Client.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	Client.exe

pid	process
1072	Client.exe

pid	process
3328	schtasks.exe
4832	schtasks.exe

pid	process
1472	PING.EXE

description	pid	process
Token: SeDebugPrivilege	4980	Client-built.exe
Token: SeDebugPrivilege	1072	Client.exe

pid	process
1072	Client.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

Client-built.exeClient.execmd.exe

description	pid	process	target process
PID 4980 wrote to memory of 3328	4980	Client-built.exe	schtasks.exe
PID 4980 wrote to memory of 3328	4980	Client-built.exe	schtasks.exe
PID 4980 wrote to memory of 1072	4980	Client-built.exe	Client.exe
PID 4980 wrote to memory of 1072	4980	Client-built.exe	Client.exe
PID 1072 wrote to memory of 4832	1072	Client.exe	schtasks.exe
PID 1072 wrote to memory of 4832	1072	Client.exe	schtasks.exe
PID 1072 wrote to memory of 4504	1072	Client.exe	schtasks.exe
PID 1072 wrote to memory of 4504	1072	Client.exe	schtasks.exe
PID 1072 wrote to memory of 4080	1072	Client.exe	cmd.exe
PID 1072 wrote to memory of 4080	1072	Client.exe	cmd.exe
PID 4080 wrote to memory of 5012	4080	cmd.exe	chcp.com
PID 4080 wrote to memory of 5012	4080	cmd.exe	chcp.com
PID 4080 wrote to memory of 1472	4080	cmd.exe	PING.EXE
PID 4080 wrote to memory of 1472	4080	cmd.exe	PING.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:4980

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "WOS64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3328

C:\Users\Admin\AppData\Roaming\Windows\Client.exe
"C:\Users\Admin\AppData\Roaming\Windows\Client.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1072

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "WOS64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4832

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /delete /tn "WOS64" /f
3⤵
PID:4504

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\77GIQXDhHRTK.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:4080

C:\Windows\system32\chcp.com
chcp 65001
4⤵
PID:5012

C:\Windows\system32\PING.EXE
ping -n 10 localhost
4⤵
- Runs ping.exe
PID:1472

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

2

T1012

System Information Discovery

2

T1082

Remote System Discovery

1

T1018

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\77GIQXDhHRTK.bat
Filesize
212B

MD5
c4f63a3b88830a570fa7e342e55f5c44

SHA1
ae0a83affba4ca95c32ee9282afbc875f95c5571

SHA256
bf105130f3739c55231a212f291942da3538a4e4836d50103063f11af4295296

SHA512
c3ab5c421892c64dc0da822906692d9c5bb44f90bc0c5317d281356d1f6aa3ec031504d2b26dd039d545a7fdf1953fc9243a45e546bb3f4112a6f134598aec28

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

MD5
bb7a42f4595499e4cd801eacb252cae8

SHA1
bd19e59cd8203d29fa232ea026189d245e07e886

SHA256
f1360aa4d9adeff9ccff753f2996be1b827d7bc3a79549cc6635346ce3eb1da2

SHA512
29f160c2a84e8b3dd86ba62e65e8d91d782f7b347900eb72198012af40353986e2ce01a85cbf288a6146192cdb12450e0ec72024a675509ee6c9e6d089bb2449

Download Submit
memory/1072-11-0x000000001AE10000-0x000000001AE20000-memory.dmp

Filesize
64KB

Download
memory/1072-10-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmp

Filesize
10.8MB

Download
memory/1072-12-0x000000001BA00000-0x000000001BA50000-memory.dmp

Filesize
320KB

Download
memory/1072-13-0x000000001BB10000-0x000000001BBC2000-memory.dmp

Filesize
712KB

Download
memory/1072-16-0x000000001BAC0000-0x000000001BAD2000-memory.dmp

Filesize
72KB

Download
memory/1072-17-0x000000001C650000-0x000000001C68C000-memory.dmp

Filesize
240KB

Download
memory/1072-18-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmp

Filesize
10.8MB

Download
memory/1072-19-0x000000001AE10000-0x000000001AE20000-memory.dmp

Filesize
64KB

Download
memory/1072-25-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmp

Filesize
10.8MB

Download
memory/4980-2-0x000000001BE60000-0x000000001BE70000-memory.dmp

Filesize
64KB

Download
memory/4980-9-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmp

Filesize
10.8MB

Download
memory/4980-0-0x0000000000C30000-0x0000000000F54000-memory.dmp

Filesize
3.1MB

Download
memory/4980-1-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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