quasar | ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d

Reason

Machine shutdown

General

Target

Payload.exe
Size

3.1MB
MD5

b0f4ccdba9627855a58b6f2f1673a3da
SHA1

bb39bbd34084efdf4d0a994fba6419819d68c766
SHA256

ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d
SHA512

7af9f641349e406b4d4079580247e72e566ee142028086225b0469ca545e064d365d4aad01d261711b7692a1c0130c7af9f875a56b026d39cb4ed86d2844c2b6
SSDEEP

49152:WveI22SsaNYfdPBldt698dBcjHJLrhOmzmOoGdkTHHB72eh2NT:WvT22SsaNYfdPBldt6+dBcjHZrhp

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

ukrainian.zapto.org:5552

Mutex

951dc75d-80db-463e-bcd9-8d5e9db51950

Attributes

encryption_key
6DE9B098AFBC1DB6507E7CF9A6B32D44488DC3BF
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
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
behavioral1/memory/744-1-0x0000000000550000-0x0000000000874000-memory.dmp	family_quasar
behavioral1/files/0x000b000000023b78-5.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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
4392	Client.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\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	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\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	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\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\ColorizationColorBalance = "89"	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\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "59"	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

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
4912	schtasks.exe
2524	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	744	Payload.exe
Token: SeDebugPrivilege	4392	Client.exe
Token: SeShutdownPrivilege	5020	shutdown.exe
Token: SeRemoteShutdownPrivilege	5020	shutdown.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
4392	Client.exe
4392	Client.exe
4392	Client.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
4392	Client.exe
4392	Client.exe
4392	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4392	Client.exe
2872	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 744 wrote to memory of 4912	744	Payload.exe	83
PID 744 wrote to memory of 4912	744	Payload.exe	83
PID 744 wrote to memory of 4392	744	Payload.exe	85
PID 744 wrote to memory of 4392	744	Payload.exe	85
PID 4392 wrote to memory of 2524	4392	Client.exe	86
PID 4392 wrote to memory of 2524	4392	Client.exe	86
PID 4392 wrote to memory of 5020	4392	Client.exe	104
PID 4392 wrote to memory of 5020	4392	Client.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\Payload.exe
"C:\Users\Admin\AppData\Local\Temp\Payload.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:744
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4912
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\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:4392
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2524
- - C:\Windows\System32\shutdown.exe
    "C:\Windows\System32\shutdown.exe" /r /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:5020

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa38c1855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:2872

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:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
b0f4ccdba9627855a58b6f2f1673a3da

SHA1
bb39bbd34084efdf4d0a994fba6419819d68c766

SHA256
ef33af6a7f06d5dae8dd1da0412b795e1222bfd6ce447614c5cac912bcd3374d

SHA512
7af9f641349e406b4d4079580247e72e566ee142028086225b0469ca545e064d365d4aad01d261711b7692a1c0130c7af9f875a56b026d39cb4ed86d2844c2b6

Download Submit
memory/744-8-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/744-1-0x0000000000550000-0x0000000000874000-memory.dmp

Filesize
3.1MB

Download
memory/744-2-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/744-0-0x00007FFB476E3000-0x00007FFB476E5000-memory.dmp

Filesize
8KB

Download
memory/4392-10-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/4392-9-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/4392-11-0x000000001C2F0000-0x000000001C340000-memory.dmp

Filesize
320KB

Download
memory/4392-12-0x000000001C400000-0x000000001C4B2000-memory.dmp

Filesize
712KB

Download
memory/4392-15-0x000000001C380000-0x000000001C392000-memory.dmp

Filesize
72KB

Download
memory/4392-16-0x000000001D000000-0x000000001D03C000-memory.dmp

Filesize
240KB

Download
memory/4392-17-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/4392-19-0x00007FFB476E0000-0x00007FFB481A1000-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