quasar | b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad

Analysis

max time kernel
1784s
max time network
1801s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
28-05-2024 21:07

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General

Target

Client-built.exe
Size

3.1MB
MD5

fd874e0d6811bcbd5feb812040853642
SHA1

7213c686b0e8cbb6527077eaeb3291791a8f06ba
SHA256

b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad
SHA512

3c8265e9d981b0d5ebbd1157b79afb3b31f57f6083f2c5ce6d4658718b5d79faf4358936af76aa4a4e1e94f7803ef6c77e07e782333d9d7003d42ea1de2ffa34
SSDEEP

49152:bvxI22SsaNYfdPBldt698dBcjHLYqQJmzaloGdbhTHHB72eh2NT:bvi22SsaNYfdPBldt6+dBcjHkqQ3

Score

10^/10

quasar seroxen spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SeroXen

operations-wagner.gl.at.ply.gg:50199

Mutex

164b6496-cf32-4fdd-b70d-de29665c8286

Attributes

encryption_key
A88D7FED7F655EBDC4F99C21BAE5EC62300AADC7
install_name
$sxr-insta.exe
log_directory
$sxr-logs
reconnect_delay
1000
startup_key
$sxr-mstha
subdirectory
$sxr-start

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral4/memory/2620-1-0x0000000000320000-0x0000000000644000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

$sxr-insta.exe

pid process

1188 $sxr-insta.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/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1560 schtasks.exe
4572 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exe$sxr-insta.exe

description pid process

Token: SeDebugPrivilege 2620 Client-built.exe
Token: SeDebugPrivilege 1188 $sxr-insta.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

$sxr-insta.exe

pid process

1188 $sxr-insta.exe

pid	process
1188	$sxr-insta.exe

pid	process
1560	schtasks.exe
4572	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2620	Client-built.exe
Token: SeDebugPrivilege	1188	$sxr-insta.exe

pid	process
1188	$sxr-insta.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exe$sxr-insta.exe

description	pid	process	target process
PID 2620 wrote to memory of 1560	2620	Client-built.exe	schtasks.exe
PID 2620 wrote to memory of 1560	2620	Client-built.exe	schtasks.exe
PID 2620 wrote to memory of 1188	2620	Client-built.exe	$sxr-insta.exe
PID 2620 wrote to memory of 1188	2620	Client-built.exe	$sxr-insta.exe
PID 1188 wrote to memory of 4572	1188	$sxr-insta.exe	schtasks.exe
PID 1188 wrote to memory of 4572	1188	$sxr-insta.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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2620

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "$sxr-mstha" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1560

C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe
"C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1188

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "$sxr-mstha" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4572

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

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\$sxr-start\$sxr-insta.exe

Filesize
3.1MB

MD5
fd874e0d6811bcbd5feb812040853642

SHA1
7213c686b0e8cbb6527077eaeb3291791a8f06ba

SHA256
b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad

SHA512
3c8265e9d981b0d5ebbd1157b79afb3b31f57f6083f2c5ce6d4658718b5d79faf4358936af76aa4a4e1e94f7803ef6c77e07e782333d9d7003d42ea1de2ffa34

Download Submit
memory/1188-10-0x00007FFEBB1D0000-0x00007FFEBBC92000-memory.dmp

Filesize
10.8MB

Download
memory/1188-11-0x00007FFEBB1D0000-0x00007FFEBBC92000-memory.dmp

Filesize
10.8MB

Download
memory/1188-12-0x000000001BD40000-0x000000001BD90000-memory.dmp

Filesize
320KB

Download
memory/1188-13-0x000000001BE50000-0x000000001BF02000-memory.dmp

Filesize
712KB

Download
memory/1188-14-0x00007FFEBB1D0000-0x00007FFEBBC92000-memory.dmp

Filesize
10.8MB

Download
memory/2620-0-0x00007FFEBB1D3000-0x00007FFEBB1D5000-memory.dmp

Filesize
8KB

Download
memory/2620-1-0x0000000000320000-0x0000000000644000-memory.dmp

Filesize
3.1MB

Download
memory/2620-2-0x00007FFEBB1D0000-0x00007FFEBBC92000-memory.dmp

Filesize
10.8MB

Download
memory/2620-9-0x00007FFEBB1D0000-0x00007FFEBBC92000-memory.dmp

Filesize
10.8MB

Download