quasar | 4cb1ad9188a93cc51b8a41d69b1fd8217ea2e16e6f94616ffc759737abda8755

Analysis

max time kernel
94s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
27/02/2024, 19:55

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Reason

Machine shutdown

General

Target
RBypass.exe
Size 3.1MB
Sample240227-ynbl9sac4s
SHA256 4cb1ad9188a93cc51b8a41d69b1fd8217ea2e16e6f94616ffc759737abda8755
MD5 906d66c9c694df55453ea4ad15302657
SHA1 3ed2719157969f5e35b49b563695e925b774ce9b
SHA512 fba71126923f20365a63ad9195935f303338cbbb091a02ba4e55216c8bdb2b89154e5062e9f3fbc0bd688e424531f2338020267665f78ada839675a8774cc024
SSDEEP 49152:PvyI22SsaNYfdPBldt698dBcjH9oRJ6ObR3LoGdzkTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjH9oRJ6I
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

86.13.66.89:4782

Mutex

584f887c-7024-4e16-a56b-684919f2613f

Attributes

encryption_key
F478C43DE74A681AD4F5AF6B28E598051B310CDC
install_name
WPShell.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows PowerShell
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/memory/1132-0-0x00000000007D0000-0x0000000000AF4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023211-6.dat	family_quasar
behavioral2/files/0x0008000000023211-8.dat	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation	WPShell.exe

Executes dropped EXE 1 IoCs

pid	Process
3552	WPShell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
3204	schtasks.exe
2544	schtasks.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "125"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1132	RBypass.exe
Token: SeDebugPrivilege	3552	WPShell.exe
Token: SeShutdownPrivilege	4336	shutdown.exe
Token: SeRemoteShutdownPrivilege	4336	shutdown.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3552	WPShell.exe
1804	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1132 wrote to memory of 3204	1132	RBypass.exe	93
PID 1132 wrote to memory of 3204	1132	RBypass.exe	93
PID 1132 wrote to memory of 3552	1132	RBypass.exe	95
PID 1132 wrote to memory of 3552	1132	RBypass.exe	95
PID 3552 wrote to memory of 2544	3552	WPShell.exe	96
PID 3552 wrote to memory of 2544	3552	WPShell.exe	96
PID 3552 wrote to memory of 4336	3552	WPShell.exe	104
PID 3552 wrote to memory of 4336	3552	WPShell.exe	104

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\RBypass.exe
"C:\Users\Admin\AppData\Local\Temp\RBypass.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1132
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows PowerShell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WPShell.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3204
- C:\Users\Admin\AppData\Roaming\SubDir\WPShell.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\WPShell.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3552
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows PowerShell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WPShell.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2544
- - C:\Windows\System32\shutdown.exe
    "C:\Windows\System32\shutdown.exe" /s /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4336

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa395e855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:1804

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

WPShell.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\WPShell.exe
Size 320KB
SHA256 e4186d42fc9735b7b6d6f48e3c3958b4e1a2f68a9ee1f9930f2a2733cf4f96b8
MD5 27cd7b2efac1f28f4bfa33b7ee6f2542
SHA1 f0539702fe71d6ef09bb410afbe4fe5486c5a6bf
SHA512 de0dbb8e2a1163a84bed33a4a751e1329aefc6542eedb2a9d58edb4ffa6899f81216fbc7bc783dde649460b6e6618a863b0ab1be680debd4550487e97d518239
SSDEEP 6144:6cvgMzKM4oLzT+g5y3DZDDFh3kwJjOGPxf3YWLCazG:hvgMzKMZSg5y3Dx59tOGPxf5CZ
MD5 SHA1 SHA512 SSDEEP

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WPShell.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\WPShell.exe
Size 64KB
SHA256 e47eb204c2c9c2a9b9e551e73e00e1ca23d3effb05ab4c7387a23f73a55bde61
MD5 6d34709a76919faf0031ea4f6fe3a783
SHA1 1040f602a0f6c48b6583950ec7118891351946ef
SHA512 6aa7196d6ba9c8032776381c3c18cf0e00eb2b5f58dc6f9f09fb7db8c747e4ad0a43194548e2cf540f69f8539c8986db03cb0dd955b5f0606c848be113e6f25c
SSDEEP 1536:33dUXMFQ52gM44KMExpltMnx2Mzi0LM0wKjJOmzTLicm:6cFQ52gMzKMeFMnVrwKdpzTOZ
MD5 SHA1 SHA512 SSDEEP

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memory/1132-10-0x00007FF98D160000-0x00007FF98DC21000-memory.dmp

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memory/1132-2-0x000000001B7D0000-0x000000001B7E0000-memory.dmp

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memory/1132-1-0x00007FF98D160000-0x00007FF98DC21000-memory.dmp

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memory/1132-0-0x00000000007D0000-0x0000000000AF4000-memory.dmp

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memory/3552-9-0x00007FF98D160000-0x00007FF98DC21000-memory.dmp

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memory/3552-11-0x0000000002900000-0x0000000002910000-memory.dmp

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memory/3552-12-0x000000001BBF0000-0x000000001BC40000-memory.dmp

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memory/3552-13-0x000000001BD00000-0x000000001BDB2000-memory.dmp

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memory/3552-14-0x00007FF98D160000-0x00007FF98DC21000-memory.dmp

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memory/3552-15-0x0000000002900000-0x0000000002910000-memory.dmp

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memory/3552-16-0x000000001BC60000-0x000000001BC72000-memory.dmp

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memory/3552-17-0x000000001BCC0000-0x000000001BCFC000-memory.dmp

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memory/3552-19-0x00007FF98D160000-0x00007FF98DC21000-memory.dmp

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Analysis

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Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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