quasar | 3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899

Analysis

max time kernel
195s
max time network
301s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
01-06-2024 23:39

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General

Target

Client-built.exe
Size

3.1MB
MD5

dd2f556310eccb91f1b3a3b3d7c52c44
SHA1

c0032a0894ea23bba4dc36e37dd26eca25e1ac81
SHA256

3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899
SHA512

79a11a3154894485cec74c202105653deb1c53d19ef26f1b33214fda58e52a01774f3c6d332c8068a94c08ffa2afc02c8dca8d2ad10c2d98d219792ab019f1a3
SSDEEP

49152:zvelL26AaNeWgPhlmVqvMQ7XSKOqRJ6kbR3LoGd9uTHHB72eh2NT:zvOL26AaNeWgPhlmVqkQ7XSKOqRJ6u

Score

10^/10

quasar fud spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

FUD

runderscore00-61208.portmap.host:61208

Mutex

41104e3a-44c7-4cb0-8bde-1a3c82e695fa

Attributes

encryption_key
0185F96AF587188E173301C437AB89C8912A9718
install_name
$sxr-powershell.exe
log_directory
$sxr-Logs
reconnect_delay
3000
startup_key
Powershell
subdirectory
$sxr-seroxen2

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/3800-1-0x0000000000490000-0x00000000007B4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

$sxr-powershell.exe

pid process

3332 $sxr-powershell.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

532 schtasks.exe
2064 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exe$sxr-powershell.exe

description pid process

Token: SeDebugPrivilege 3800 Client-built.exe
Token: SeDebugPrivilege 3332 $sxr-powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

$sxr-powershell.exe

pid process

3332 $sxr-powershell.exe

pid	process
3332	$sxr-powershell.exe

pid	process
532	schtasks.exe
2064	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3800	Client-built.exe
Token: SeDebugPrivilege	3332	$sxr-powershell.exe

pid	process
3332	$sxr-powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exe$sxr-powershell.exe

description	pid	process	target process
PID 3800 wrote to memory of 532	3800	Client-built.exe	schtasks.exe
PID 3800 wrote to memory of 532	3800	Client-built.exe	schtasks.exe
PID 3800 wrote to memory of 3332	3800	Client-built.exe	$sxr-powershell.exe
PID 3800 wrote to memory of 3332	3800	Client-built.exe	$sxr-powershell.exe
PID 3332 wrote to memory of 2064	3332	$sxr-powershell.exe	schtasks.exe
PID 3332 wrote to memory of 2064	3332	$sxr-powershell.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:3800

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:532

C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe
"C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3332

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2064

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-seroxen2\$sxr-powershell.exe

Filesize
3.1MB

MD5
dd2f556310eccb91f1b3a3b3d7c52c44

SHA1
c0032a0894ea23bba4dc36e37dd26eca25e1ac81

SHA256
3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899

SHA512
79a11a3154894485cec74c202105653deb1c53d19ef26f1b33214fda58e52a01774f3c6d332c8068a94c08ffa2afc02c8dca8d2ad10c2d98d219792ab019f1a3

Download Submit
memory/3332-11-0x00007FF8BF310000-0x00007FF8BFCFC000-memory.dmp

Filesize
9.9MB

Download
memory/3332-10-0x00007FF8BF310000-0x00007FF8BFCFC000-memory.dmp

Filesize
9.9MB

Download
memory/3332-12-0x0000000003070000-0x00000000030C0000-memory.dmp

Filesize
320KB

Download
memory/3332-13-0x000000001C330000-0x000000001C3E2000-memory.dmp

Filesize
712KB

Download
memory/3332-16-0x000000001C2D0000-0x000000001C2E2000-memory.dmp

Filesize
72KB

Download
memory/3332-17-0x000000001CE20000-0x000000001CE5E000-memory.dmp

Filesize
248KB

Download
memory/3332-18-0x00007FF8BF310000-0x00007FF8BFCFC000-memory.dmp

Filesize
9.9MB

Download
memory/3332-19-0x00007FF8BF310000-0x00007FF8BFCFC000-memory.dmp

Filesize
9.9MB

Download
memory/3800-2-0x00007FF8BF310000-0x00007FF8BFCFC000-memory.dmp

Filesize
9.9MB

Download
memory/3800-0-0x00007FF8BF313000-0x00007FF8BF314000-memory.dmp

Filesize
4KB

Download
memory/3800-9-0x00007FF8BF310000-0x00007FF8BFCFC000-memory.dmp

Filesize
9.9MB

Download
memory/3800-1-0x0000000000490000-0x00000000007B4000-memory.dmp

Filesize
3.1MB

Download