quasar | 3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899

Analysis

max time kernel
213s
max time network
284s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
01-06-2024 23:34

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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
behavioral3/memory/4028-1-0x0000000000A10000-0x0000000000D34000-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

5060 $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

2408 schtasks.exe
3212 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exe$sxr-powershell.exe

description pid process

Token: SeDebugPrivilege 4028 Client-built.exe
Token: SeDebugPrivilege 5060 $sxr-powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

$sxr-powershell.exe

pid process

5060 $sxr-powershell.exe

pid	process
5060	$sxr-powershell.exe

pid	process
2408	schtasks.exe
3212	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4028	Client-built.exe
Token: SeDebugPrivilege	5060	$sxr-powershell.exe

pid	process
5060	$sxr-powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exe$sxr-powershell.exe

description	pid	process	target process
PID 4028 wrote to memory of 2408	4028	Client-built.exe	schtasks.exe
PID 4028 wrote to memory of 2408	4028	Client-built.exe	schtasks.exe
PID 4028 wrote to memory of 5060	4028	Client-built.exe	$sxr-powershell.exe
PID 4028 wrote to memory of 5060	4028	Client-built.exe	$sxr-powershell.exe
PID 5060 wrote to memory of 3212	5060	$sxr-powershell.exe	schtasks.exe
PID 5060 wrote to memory of 3212	5060	$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:4028

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:2408

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:5060

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:3212

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/4028-0-0x00007FFC3E0D3000-0x00007FFC3E0D5000-memory.dmp

Filesize
8KB

Download
memory/4028-1-0x0000000000A10000-0x0000000000D34000-memory.dmp

Filesize
3.1MB

Download
memory/4028-2-0x00007FFC3E0D0000-0x00007FFC3EB92000-memory.dmp

Filesize
10.8MB

Download
memory/4028-9-0x00007FFC3E0D0000-0x00007FFC3EB92000-memory.dmp

Filesize
10.8MB

Download
memory/5060-11-0x00007FFC3E0D0000-0x00007FFC3EB92000-memory.dmp

Filesize
10.8MB

Download
memory/5060-10-0x00007FFC3E0D0000-0x00007FFC3EB92000-memory.dmp

Filesize
10.8MB

Download
memory/5060-12-0x000000001B570000-0x000000001B5C0000-memory.dmp

Filesize
320KB

Download
memory/5060-13-0x000000001C0B0000-0x000000001C162000-memory.dmp

Filesize
712KB

Download
memory/5060-17-0x000000001C7C0000-0x000000001C7FC000-memory.dmp

Filesize
240KB

Download
memory/5060-16-0x000000001C050000-0x000000001C062000-memory.dmp

Filesize
72KB

Download
memory/5060-18-0x00007FFC3E0D0000-0x00007FFC3EB92000-memory.dmp

Filesize
10.8MB

Download
memory/5060-19-0x00007FFC3E0D0000-0x00007FFC3EB92000-memory.dmp

Filesize
10.8MB

Download