quasar | b2a5bbacabfa8f6cd6c24f87a5825a8231cce32086d369be612c6b7bdf658dad

Analysis

max time kernel
1799s
max time network
1800s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
28-05-2024 21:06

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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/636-1-0x0000000000A00000-0x0000000000D24000-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

560 $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

1552 schtasks.exe
1380 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exe$sxr-insta.exe

description pid process

Token: SeDebugPrivilege 636 Client-built.exe
Token: SeDebugPrivilege 560 $sxr-insta.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

$sxr-insta.exe

pid process

560 $sxr-insta.exe

pid	process
560	$sxr-insta.exe

pid	process
1552	schtasks.exe
1380	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	636	Client-built.exe
Token: SeDebugPrivilege	560	$sxr-insta.exe

pid	process
560	$sxr-insta.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exe$sxr-insta.exe

description	pid	process	target process
PID 636 wrote to memory of 1552	636	Client-built.exe	schtasks.exe
PID 636 wrote to memory of 1552	636	Client-built.exe	schtasks.exe
PID 636 wrote to memory of 560	636	Client-built.exe	$sxr-insta.exe
PID 636 wrote to memory of 560	636	Client-built.exe	$sxr-insta.exe
PID 560 wrote to memory of 1380	560	$sxr-insta.exe	schtasks.exe
PID 560 wrote to memory of 1380	560	$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:636

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:1552

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:560

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:1380

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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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/560-11-0x00007FFFAE690000-0x00007FFFAF152000-memory.dmp

Filesize
10.8MB

Download
memory/560-10-0x00007FFFAE690000-0x00007FFFAF152000-memory.dmp

Filesize
10.8MB

Download
memory/560-12-0x000000001B690000-0x000000001B6E0000-memory.dmp

Filesize
320KB

Download
memory/560-13-0x000000001C000000-0x000000001C0B2000-memory.dmp

Filesize
712KB

Download
memory/560-16-0x000000001B710000-0x000000001B722000-memory.dmp

Filesize
72KB

Download
memory/560-17-0x000000001BF80000-0x000000001BFBC000-memory.dmp

Filesize
240KB

Download
memory/560-18-0x00007FFFAE690000-0x00007FFFAF152000-memory.dmp

Filesize
10.8MB

Download
memory/560-19-0x00007FFFAE690000-0x00007FFFAF152000-memory.dmp

Filesize
10.8MB

Download
memory/636-2-0x00007FFFAE690000-0x00007FFFAF152000-memory.dmp

Filesize
10.8MB

Download
memory/636-1-0x0000000000A00000-0x0000000000D24000-memory.dmp

Filesize
3.1MB

Download
memory/636-9-0x00007FFFAE690000-0x00007FFFAF152000-memory.dmp

Filesize
10.8MB

Download
memory/636-0-0x00007FFFAE693000-0x00007FFFAE695000-memory.dmp

Filesize
8KB

Download