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/4108-0-0x0000000000720000-0x0000000000A44000-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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation Client.exe
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2740 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

1964 schtasks.exe
3340 schtasks.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

4892 PING.EXE
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 4108 Client-built.exe
Token: SeDebugPrivilege 2740 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2740 Client.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	Client.exe

pid	process
2740	Client.exe

pid	process
1964	schtasks.exe
3340	schtasks.exe

pid	process
4892	PING.EXE

description	pid	process
Token: SeDebugPrivilege	4108	Client-built.exe
Token: SeDebugPrivilege	2740	Client.exe

pid	process
2740	Client.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

Client-built.exeClient.execmd.exe

description	pid	process	target process
PID 4108 wrote to memory of 1964	4108	Client-built.exe	schtasks.exe
PID 4108 wrote to memory of 1964	4108	Client-built.exe	schtasks.exe
PID 4108 wrote to memory of 2740	4108	Client-built.exe	Client.exe
PID 4108 wrote to memory of 2740	4108	Client-built.exe	Client.exe
PID 2740 wrote to memory of 3340	2740	Client.exe	schtasks.exe
PID 2740 wrote to memory of 3340	2740	Client.exe	schtasks.exe
PID 2740 wrote to memory of 2336	2740	Client.exe	schtasks.exe
PID 2740 wrote to memory of 2336	2740	Client.exe	schtasks.exe
PID 2740 wrote to memory of 1980	2740	Client.exe	cmd.exe
PID 2740 wrote to memory of 1980	2740	Client.exe	cmd.exe
PID 1980 wrote to memory of 1536	1980	cmd.exe	chcp.com
PID 1980 wrote to memory of 1536	1980	cmd.exe	chcp.com
PID 1980 wrote to memory of 4892	1980	cmd.exe	PING.EXE
PID 1980 wrote to memory of 4892	1980	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:4108

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:1964

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:2740

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:3340

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /delete /tn "WOS64" /f
3⤵
PID:2336

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\GtzzL4nB8YNK.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:1980

C:\Windows\system32\chcp.com
chcp 65001
4⤵
PID:1536

C:\Windows\system32\PING.EXE
ping -n 10 localhost
4⤵
- Runs ping.exe
PID:4892

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\GtzzL4nB8YNK.bat
Filesize
212B

MD5
37e9ce5e211bca77692206ff7a6df6f2

SHA1
e2f813d95b15484e868469e571afc37971523a0d

SHA256
39c2cf8d7d44aaee0b0233c1e92c3d1a9563fa0aaee0a514fcb2e6320e0806a2

SHA512
dd6c19c6f330111a9c0f02cb917e6bdfcfe7f36221af0f4b254b0e286721ac9bca3d93fb8f3fe76dd0d6e45286ce5302fb63bdb00d29eb459a58be389425d409

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

MD5
bb7a42f4595499e4cd801eacb252cae8

SHA1
bd19e59cd8203d29fa232ea026189d245e07e886

SHA256
f1360aa4d9adeff9ccff753f2996be1b827d7bc3a79549cc6635346ce3eb1da2

SHA512
29f160c2a84e8b3dd86ba62e65e8d91d782f7b347900eb72198012af40353986e2ce01a85cbf288a6146192cdb12450e0ec72024a675509ee6c9e6d089bb2449

Download Submit
memory/2740-11-0x000000001B320000-0x000000001B330000-memory.dmp

Filesize
64KB

Download
memory/2740-9-0x00007FFE83D70000-0x00007FFE84831000-memory.dmp

Filesize
10.8MB

Download
memory/2740-12-0x000000001B240000-0x000000001B290000-memory.dmp

Filesize
320KB

Download
memory/2740-13-0x000000001BD40000-0x000000001BDF2000-memory.dmp

Filesize
712KB

Download
memory/2740-16-0x000000001B2E0000-0x000000001B2F2000-memory.dmp

Filesize
72KB

Download
memory/2740-17-0x000000001BCC0000-0x000000001BCFC000-memory.dmp

Filesize
240KB

Download
memory/2740-18-0x00007FFE83D70000-0x00007FFE84831000-memory.dmp

Filesize
10.8MB

Download
memory/2740-23-0x00007FFE83D70000-0x00007FFE84831000-memory.dmp

Filesize
10.8MB

Download
memory/4108-2-0x0000000002AD0000-0x0000000002AE0000-memory.dmp

Filesize
64KB

Download
memory/4108-10-0x00007FFE83D70000-0x00007FFE84831000-memory.dmp

Filesize
10.8MB

Download
memory/4108-0-0x0000000000720000-0x0000000000A44000-memory.dmp

Filesize
3.1MB

Download
memory/4108-1-0x00007FFE83D70000-0x00007FFE84831000-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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