quasar | 759d5281882dfba5e7504f46a71c534a7b844701fda511149bc38c3ff53be0f1

Reason

Machine shutdown

General

Target

plswork.exe
Size

3.1MB
MD5

6177caea7e42e38c38bc0bd47bb9331c
SHA1

76e6b53c666212a9dd06c943f22cc360c5756b36
SHA256

759d5281882dfba5e7504f46a71c534a7b844701fda511149bc38c3ff53be0f1
SHA512

dc2ce7aedf1c93b06e22e8995e38e89057165aa07d5dc381e48588a1174b099d6d0c88aebc5cdabed9edf6d730e5bb3a884caa2064815a68cc16860f707997f3
SSDEEP

49152:XvTlL26AaNeWgPhlmVqvMQ7XSKW/RJ6FbR3LoGd45THHB72eh2NT:XvJL26AaNeWgPhlmVqkQ7XSKW/RJ6X

Score

10^/10

quasar first spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

first

C2

nature-documented.gl.at.ply.gg:57757

Mutex

1fae1825-d0ee-4a31-a2bb-ad761ecb2c11

Attributes

encryption_key
59DD70006F5E5424ACBA442199524AA9815F439E
install_name
Calculator.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RtkAudUService86
subdirectory
Calculator_UWP

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/3976-1-0x0000000000C00000-0x0000000000F24000-memory.dmp	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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	plswork.exe

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

System Information Discovery
T1082

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	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
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	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 = "206"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
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\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	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\ColorizationGlassAttribute = "1"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3976	plswork.exe
Token: SeShutdownPrivilege	1256	shutdown.exe
Token: SeRemoteShutdownPrivilege	1256	shutdown.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
3976	plswork.exe
3976	plswork.exe
3976	plswork.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
3976	plswork.exe
3976	plswork.exe
3976	plswork.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5108	LogonUI.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3976 wrote to memory of 1256	3976	plswork.exe	104
PID 3976 wrote to memory of 1256	3976	plswork.exe	104

C:\Users\Admin\AppData\Local\Temp\plswork.exe
"C:\Users\Admin\AppData\Local\Temp\plswork.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:3976
- C:\Windows\System32\shutdown.exe
  "C:\Windows\System32\shutdown.exe" /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1256

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa38cb855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:5108

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3976-0-0x00007FFA07DA3000-0x00007FFA07DA5000-memory.dmp

Filesize
8KB

Download
memory/3976-1-0x0000000000C00000-0x0000000000F24000-memory.dmp

Filesize
3.1MB

Download
memory/3976-2-0x00007FFA07DA0000-0x00007FFA08861000-memory.dmp

Filesize
10.8MB

Download
memory/3976-3-0x000000001C620000-0x000000001C670000-memory.dmp

Filesize
320KB

Download
memory/3976-4-0x000000001C730000-0x000000001C7E2000-memory.dmp

Filesize
712KB

Download
memory/3976-7-0x000000001C670000-0x000000001C682000-memory.dmp

Filesize
72KB

Download
memory/3976-8-0x000000001C6D0000-0x000000001C70C000-memory.dmp

Filesize
240KB

Download
memory/3976-9-0x00007FFA07DA3000-0x00007FFA07DA5000-memory.dmp

Filesize
8KB

Download
memory/3976-10-0x00007FFA07DA0000-0x00007FFA08861000-memory.dmp

Filesize
10.8MB

Download
memory/3976-11-0x00007FFA07DA0000-0x00007FFA08861000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors