quasar | 3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899

Analysis

max time kernel
300s
max time network
302s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
01/06/2024, 23:38

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General

Target
Client-built.exe
Size 3.1MB
Sample240601-3mpjysbe96
SHA256 3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899
MD5 dd2f556310eccb91f1b3a3b3d7c52c44
SHA1 c0032a0894ea23bba4dc36e37dd26eca25e1ac81
SHA512 79a11a3154894485cec74c202105653deb1c53d19ef26f1b33214fda58e52a01774f3c6d332c8068a94c08ffa2afc02c8dca8d2ad10c2d98d219792ab019f1a3
SSDEEP 49152:zvelL26AaNeWgPhlmVqvMQ7XSKOqRJ6kbR3LoGd9uTHHB72eh2NT:zvOL26AaNeWgPhlmVqkQ7XSKOqRJ6u
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar fud spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

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

resource	yara_rule
behavioral2/memory/1436-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp	family_quasar
behavioral2/files/0x0009000000023255-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2240	$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

pid	Process
1412	schtasks.exe
216	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1436	Client-built.exe
Token: SeDebugPrivilege	2240	$sxr-powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2240	$sxr-powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1436 wrote to memory of 1412	1436	Client-built.exe	92
PID 1436 wrote to memory of 1412	1436	Client-built.exe	92
PID 1436 wrote to memory of 2240	1436	Client-built.exe	94
PID 1436 wrote to memory of 2240	1436	Client-built.exe	94
PID 2240 wrote to memory of 216	2240	$sxr-powershell.exe	95
PID 2240 wrote to memory of 216	2240	$sxr-powershell.exe	95

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:1436
- 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:1412
- 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:2240
- - 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:216

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4140 --field-trial-handle=3192,i,2785050981002401924,4037047756083432660,262144 --variations-seed-version /prefetch:8
1⤵
PID:4464

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

$sxr-powershell.exe

Path C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe
Size 3.1MB
SHA256 3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899
MD5 dd2f556310eccb91f1b3a3b3d7c52c44
SHA1 c0032a0894ea23bba4dc36e37dd26eca25e1ac81
SHA512 79a11a3154894485cec74c202105653deb1c53d19ef26f1b33214fda58e52a01774f3c6d332c8068a94c08ffa2afc02c8dca8d2ad10c2d98d219792ab019f1a3
SSDEEP 49152:zvelL26AaNeWgPhlmVqvMQ7XSKOqRJ6kbR3LoGd9uTHHB72eh2NT:zvOL26AaNeWgPhlmVqkQ7XSKOqRJ6u
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1436-10-0x00007FFED7BA0000-0x00007FFED8661000-memory.dmp

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memory/1436-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp

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memory/1436-2-0x00007FFED7BA0000-0x00007FFED8661000-memory.dmp

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memory/1436-0-0x00007FFED7BA3000-0x00007FFED7BA5000-memory.dmp

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memory/2240-11-0x00007FFED7BA0000-0x00007FFED8661000-memory.dmp

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memory/2240-9-0x00007FFED7BA0000-0x00007FFED8661000-memory.dmp

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memory/2240-12-0x000000001B950000-0x000000001B9A0000-memory.dmp

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memory/2240-13-0x000000001BA60000-0x000000001BB12000-memory.dmp

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memory/2240-16-0x000000001B9F0000-0x000000001BA02000-memory.dmp

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memory/2240-17-0x000000001C770000-0x000000001C7AC000-memory.dmp

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memory/2240-18-0x000000001C460000-0x000000001C562000-memory.dmp

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memory/2240-20-0x00007FFED7BA0000-0x00007FFED8661000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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