quasar | b32a207659b816576ab338c251dd995273a67cdc1e3261968e7676465790b36c

Analysis

max time kernel
147s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
submitted
16/03/2024, 16:10

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
Client-built.exe
Size 3.1MB
Sample240316-tmbtesec9y
SHA256 b32a207659b816576ab338c251dd995273a67cdc1e3261968e7676465790b36c
MD5 b5e343c7fafb1c29ae7ef2938988d112
SHA1 4d78f8c195a0aeb9e639cd9938bb886493190f56
SHA512 c2f625d0a451680a1e88deba249cb9b5ec1651459c69b7a9f0be6de9d4c657023824ab184569f7ebeafcd71c401354e4300715be0e688111ec1a0f2c4898400b
SSDEEP 49152:rvrI22SsaNYfdPBldt698dBcjHUERJ6kbR3LoGd7THHB72eh2NT:rvU22SsaNYfdPBldt6+dBcjHUERJ6u
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

LaraLoveU-20236.portmap.host:20236

Mutex

5c8ed964-bf4e-4729-b2f1-f45f791415d5

Attributes

encryption_key
BD84572F815B9DEEE2ED71AC700803FEF1E9E5AE
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
WindowsClient
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/2908-0-0x0000000000F70000-0x0000000001294000-memory.dmp	family_quasar
behavioral2/files/0x000100000002a781-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1880	Client.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
2448	schtasks.exe
3504	schtasks.exe

Modifies Internet Explorer settings 1 TTPs 29 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Main\OperationalData = "8"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\IECompatVersionHigh = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\GPU\SoftwareFallback = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\GPU\DeviceId = "140"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\IECompatVersionLow = "395196024"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Main\OperationalData = "13"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Main\DisableFirstRunCustomize = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPMigrationVer = "1"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\IECompatVersionLow = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\CVListXMLVersionHigh = "268435456"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\CVListDomainAttributeSet = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Protected - It is a violation of Windows Policy to modify. See aka.ms/browserpolicy\HomepagesUpgradeVersion = "1"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\CVListXMLVersionLow = "395196024"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\VersionManager\FirstCheckForUpdateHighDateTime = "31094796"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Protected - It is a violation of Windows Policy to modify. See aka.ms/browserpolicy	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\GPU\Revision = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\VersionManager\FirstCheckForUpdateLowDateTime = "2815713116"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Main\OperationalData = "9"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\GPU\VendorId = "4318"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\IECompatVersionHigh = "268435456"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\StaleCompatCache = "0"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\GPU	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\GPU\SubSysId = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\StaleCompatCache = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\VersionManager	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1637591879-962683004-3585269084-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2908	Client-built.exe
Token: SeDebugPrivilege	1880	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1880	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2908 wrote to memory of 2448	2908	Client-built.exe	81
PID 2908 wrote to memory of 2448	2908	Client-built.exe	81
PID 2908 wrote to memory of 1880	2908	Client-built.exe	83
PID 2908 wrote to memory of 1880	2908	Client-built.exe	83
PID 1880 wrote to memory of 3504	1880	Client.exe	85
PID 1880 wrote to memory of 3504	1880	Client.exe	85

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:2908
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WindowsClient" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2448
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1880
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "WindowsClient" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3504

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" C:\Users\Admin\Desktop\UseDeny.mht
1⤵
- Modifies Internet Explorer settings
PID:3048

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3584

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
1⤵
PID:4652

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

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 b32a207659b816576ab338c251dd995273a67cdc1e3261968e7676465790b36c
MD5 b5e343c7fafb1c29ae7ef2938988d112
SHA1 4d78f8c195a0aeb9e639cd9938bb886493190f56
SHA512 c2f625d0a451680a1e88deba249cb9b5ec1651459c69b7a9f0be6de9d4c657023824ab184569f7ebeafcd71c401354e4300715be0e688111ec1a0f2c4898400b
SSDEEP 49152:rvrI22SsaNYfdPBldt698dBcjHUERJ6kbR3LoGd7THHB72eh2NT:rvU22SsaNYfdPBldt6+dBcjHUERJ6u
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1880-11-0x000000001B0D0000-0x000000001B0E0000-memory.dmp

Download

memory/1880-10-0x00007FF9263E0000-0x00007FF926EA2000-memory.dmp

Download

memory/1880-12-0x000000001B820000-0x000000001B870000-memory.dmp

Download

memory/1880-13-0x000000001B930000-0x000000001B9E2000-memory.dmp

Download

memory/1880-16-0x000000001B890000-0x000000001B8A2000-memory.dmp

Download

memory/1880-17-0x000000001B8F0000-0x000000001B92C000-memory.dmp

Download

memory/1880-18-0x00007FF9263E0000-0x00007FF926EA2000-memory.dmp

Download

memory/1880-19-0x000000001B0D0000-0x000000001B0E0000-memory.dmp

Download

memory/2908-2-0x000000001BFC0000-0x000000001BFD0000-memory.dmp

Download

memory/2908-1-0x00007FF9263E0000-0x00007FF926EA2000-memory.dmp

Download

memory/2908-9-0x00007FF9263E0000-0x00007FF926EA2000-memory.dmp

Download

memory/2908-0-0x0000000000F70000-0x0000000001294000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads