quasar | e190f4cc54506973f7c38fa2cf39148e7bf38887467694d57ae10fc356cd863b

Reason

Machine shutdown

General

Target

Client-built.exe
Size

3.1MB
MD5

30fe4e7e33259e52666ca6cd6eb12ee3
SHA1

c5c8506ba00e9416197d39149394fceacf3551ac
SHA256

e190f4cc54506973f7c38fa2cf39148e7bf38887467694d57ae10fc356cd863b
SHA512

67647d16e50623fc2019a0c88295c7d1dfe715b00cce6d3e15098f2b668e55dfc3e62a1d27cdf8f68f2c2a770b1f83c8d7ec28c03fa627f03e9984f62ef46bd8
SSDEEP

49152:rvbI22SsaNYfdPBldt698dBcjHidimwmzstoGdaTHHB72eh2NT:rvk22SsaNYfdPBldt6+dBcjHWim+

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

184.98.230.97:4545

Mutex

381fb32a-fd3f-4701-8fca-4b51cb0abac7

Attributes

encryption_key
9D21D822B3655AB7418E123B9807F485C0122440
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Antivirus
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1284-1-0x0000000000630000-0x0000000000954000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c92-5.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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3888	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.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\AccentColor = "4292311040"	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\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	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\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	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
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "232"	LogonUI.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3260	schtasks.exe
3868	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1284	Client-built.exe
Token: SeDebugPrivilege	3888	Client.exe
Token: SeShutdownPrivilege	4372	shutdown.exe
Token: SeRemoteShutdownPrivilege	4372	shutdown.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
3888	Client.exe
3888	Client.exe
3888	Client.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
3888	Client.exe
3888	Client.exe
3888	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3888	Client.exe
2664	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1284 wrote to memory of 3260	1284	Client-built.exe	83
PID 1284 wrote to memory of 3260	1284	Client-built.exe	83
PID 1284 wrote to memory of 3888	1284	Client-built.exe	85
PID 1284 wrote to memory of 3888	1284	Client-built.exe	85
PID 3888 wrote to memory of 3868	3888	Client.exe	86
PID 3888 wrote to memory of 3868	3888	Client.exe	86
PID 3888 wrote to memory of 4372	3888	Client.exe	102
PID 3888 wrote to memory of 4372	3888	Client.exe	102

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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1284
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Antivirus " /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3260
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3888
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Antivirus " /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3868
- - C:\Windows\System32\shutdown.exe
    "C:\Windows\System32\shutdown.exe" /s /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4372

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa393c055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:2664

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
30fe4e7e33259e52666ca6cd6eb12ee3

SHA1
c5c8506ba00e9416197d39149394fceacf3551ac

SHA256
e190f4cc54506973f7c38fa2cf39148e7bf38887467694d57ae10fc356cd863b

SHA512
67647d16e50623fc2019a0c88295c7d1dfe715b00cce6d3e15098f2b668e55dfc3e62a1d27cdf8f68f2c2a770b1f83c8d7ec28c03fa627f03e9984f62ef46bd8

Download Submit
memory/1284-0-0x00007FFC7BC93000-0x00007FFC7BC95000-memory.dmp

Filesize
8KB

Download
memory/1284-1-0x0000000000630000-0x0000000000954000-memory.dmp

Filesize
3.1MB

Download
memory/1284-2-0x00007FFC7BC90000-0x00007FFC7C751000-memory.dmp

Filesize
10.8MB

Download
memory/1284-8-0x00007FFC7BC90000-0x00007FFC7C751000-memory.dmp

Filesize
10.8MB

Download
memory/3888-10-0x00007FFC7BC90000-0x00007FFC7C751000-memory.dmp

Filesize
10.8MB

Download
memory/3888-9-0x00007FFC7BC90000-0x00007FFC7C751000-memory.dmp

Filesize
10.8MB

Download
memory/3888-11-0x000000001C1E0000-0x000000001C230000-memory.dmp

Filesize
320KB

Download
memory/3888-12-0x000000001C2F0000-0x000000001C3A2000-memory.dmp

Filesize
712KB

Download
memory/3888-15-0x000000001C270000-0x000000001C282000-memory.dmp

Filesize
72KB

Download
memory/3888-16-0x000000001C9F0000-0x000000001CA2C000-memory.dmp

Filesize
240KB

Download
memory/3888-17-0x00007FFC7BC90000-0x00007FFC7C751000-memory.dmp

Filesize
10.8MB

Download
memory/3888-19-0x00007FFC7BC90000-0x00007FFC7C751000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads