quasar | 45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8

Analysis

max time kernel
277s
max time network
294s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
02-06-2024 18:08

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General

Target

Client-built.exe
Size

348KB
MD5

3f99cb13866f63a572bfc49f56e49a21
SHA1

e968e6c46296389f04660d6811298025a5eef76f
SHA256

45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8
SHA512

042bca3a560803e9e3a1704a92278bbb63ffa3c7b7217eb7602a3c0a5b14d4ad71adb92423e937276df4f1e0a31c6c1ab51ef922e2c3d6ded9cded185edbffb2
SSDEEP

6144:ecEHwNHJsa2x0Kx4IKhIBbIVhpXZVn/DOxpxnKACXsK:nxpsalT5XVhpXHrOxrnLcsK

Score

10^/10

quasar client spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Client

runderscore00-61208.portmap.host:61208

Mutex

QSR_MUTEX_UyCo16EyzQLUNZiVH0

Attributes

encryption_key
AaATXyVYZ9AKtrWxhyCz
install_name
Client.exe
log_directory
Keylogs
reconnect_delay
3000
startup_key
Powershell
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral3/memory/4500-1-0x0000000000880000-0x00000000008DE000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2228 Client.exe
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

1 ip-api.com
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

3584 schtasks.exe
444 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 4500 Client-built.exe
Token: SeDebugPrivilege 2228 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2228 Client.exe

pid	process
2228	Client.exe

flow	ioc
1	ip-api.com

pid	process
3584	schtasks.exe
444	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4500	Client-built.exe
Token: SeDebugPrivilege	2228	Client.exe

pid	process
2228	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 4500 wrote to memory of 444	4500	Client-built.exe	schtasks.exe
PID 4500 wrote to memory of 444	4500	Client-built.exe	schtasks.exe
PID 4500 wrote to memory of 444	4500	Client-built.exe	schtasks.exe
PID 4500 wrote to memory of 2228	4500	Client-built.exe	Client.exe
PID 4500 wrote to memory of 2228	4500	Client-built.exe	Client.exe
PID 4500 wrote to memory of 2228	4500	Client-built.exe	Client.exe
PID 2228 wrote to memory of 3584	2228	Client.exe	schtasks.exe
PID 2228 wrote to memory of 3584	2228	Client.exe	schtasks.exe
PID 2228 wrote to memory of 3584	2228	Client.exe	schtasks.exe

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:4500

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:444

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2228

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3584

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
348KB

MD5
3f99cb13866f63a572bfc49f56e49a21

SHA1
e968e6c46296389f04660d6811298025a5eef76f

SHA256
45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8

SHA512
042bca3a560803e9e3a1704a92278bbb63ffa3c7b7217eb7602a3c0a5b14d4ad71adb92423e937276df4f1e0a31c6c1ab51ef922e2c3d6ded9cded185edbffb2

Download Submit
memory/2228-19-0x0000000074920000-0x00000000750D1000-memory.dmp

Filesize
7.7MB

Download
memory/2228-18-0x00000000065F0000-0x00000000065FA000-memory.dmp

Filesize
40KB

Download
memory/2228-16-0x0000000074920000-0x00000000750D1000-memory.dmp

Filesize
7.7MB

Download
memory/2228-14-0x0000000074920000-0x00000000750D1000-memory.dmp

Filesize
7.7MB

Download
memory/4500-3-0x0000000005420000-0x00000000054B2000-memory.dmp

Filesize
584KB

Download
memory/4500-6-0x00000000060C0000-0x00000000060D2000-memory.dmp

Filesize
72KB

Download
memory/4500-7-0x00000000065F0000-0x000000000662C000-memory.dmp

Filesize
240KB

Download
memory/4500-5-0x00000000054C0000-0x0000000005526000-memory.dmp

Filesize
408KB

Download
memory/4500-4-0x0000000074920000-0x00000000750D1000-memory.dmp

Filesize
7.7MB

Download
memory/4500-15-0x0000000074920000-0x00000000750D1000-memory.dmp

Filesize
7.7MB

Download
memory/4500-0-0x000000007492E000-0x000000007492F000-memory.dmp

Filesize
4KB

Download
memory/4500-2-0x00000000059D0000-0x0000000005F76000-memory.dmp

Filesize
5.6MB

Download
memory/4500-1-0x0000000000880000-0x00000000008DE000-memory.dmp

Filesize
376KB

Download