quasar | f6a0a782d574de811fe66ecf6416c69b486f9ca20faf96cfc863a00063306338

Reason

Machine shutdown

General

Target

b94af11cca65c557d23559e978a49d18.exe
Size

3.1MB
MD5

b94af11cca65c557d23559e978a49d18
SHA1

0c3436d0c5df8e2e39bf4869bbe4413ca8d594b7
SHA256

f6a0a782d574de811fe66ecf6416c69b486f9ca20faf96cfc863a00063306338
SHA512

c1254360b2382957f043b8edcf36b28f13a93d0860dc9609d9b46eded81bc004e4149113e9eaad8b4d2cc18164942588bd4e97ecd8fce4f9afd8e537bc668b16
SSDEEP

49152:PvSI22SsaNYfdPBldt698dBcjHNGRJ67bR3LoGdGH3THHB72eh2NT:Pv/22SsaNYfdPBldt6+dBcjHNGRJ6N

Score

10^/10

quasar 28 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

28

C2

194.26.192.167:2768

Mutex

859d5f90-e2d0-4b2d-ba9f-5371df032ec2

Attributes

encryption_key
BE2B0B270E4DB19CAA5C42E9D2EBF64645A2D055
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RuntimeBroker
subdirectory
RuntimeBroker

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/636-1-0x0000000000100000-0x0000000000424000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cb5-5.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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	RuntimeBroker.exe

Executes dropped EXE 1 IoCs

pid	Process
736	RuntimeBroker.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\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\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 (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\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\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "157"	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\ColorizationColor = "3288365271"	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
1904	schtasks.exe
2728	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	636	b94af11cca65c557d23559e978a49d18.exe
Token: SeDebugPrivilege	736	RuntimeBroker.exe
Token: SeShutdownPrivilege	1588	shutdown.exe
Token: SeRemoteShutdownPrivilege	1588	shutdown.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
736	RuntimeBroker.exe
1596	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 636 wrote to memory of 1904	636	b94af11cca65c557d23559e978a49d18.exe	82
PID 636 wrote to memory of 1904	636	b94af11cca65c557d23559e978a49d18.exe	82
PID 636 wrote to memory of 736	636	b94af11cca65c557d23559e978a49d18.exe	84
PID 636 wrote to memory of 736	636	b94af11cca65c557d23559e978a49d18.exe	84
PID 736 wrote to memory of 2728	736	RuntimeBroker.exe	85
PID 736 wrote to memory of 2728	736	RuntimeBroker.exe	85
PID 736 wrote to memory of 1588	736	RuntimeBroker.exe	88
PID 736 wrote to memory of 1588	736	RuntimeBroker.exe	88

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\b94af11cca65c557d23559e978a49d18.exe
"C:\Users\Admin\AppData\Local\Temp\b94af11cca65c557d23559e978a49d18.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:636
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\RuntimeBroker\RuntimeBroker.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1904
- C:\Users\Admin\AppData\Roaming\RuntimeBroker\RuntimeBroker.exe
  "C:\Users\Admin\AppData\Roaming\RuntimeBroker\RuntimeBroker.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:736
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\RuntimeBroker\RuntimeBroker.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2728
- - C:\Windows\System32\shutdown.exe
    "C:\Windows\System32\shutdown.exe" /s /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1588

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa39a8855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:1596

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\RuntimeBroker\RuntimeBroker.exe

Filesize
3.1MB

MD5
b94af11cca65c557d23559e978a49d18

SHA1
0c3436d0c5df8e2e39bf4869bbe4413ca8d594b7

SHA256
f6a0a782d574de811fe66ecf6416c69b486f9ca20faf96cfc863a00063306338

SHA512
c1254360b2382957f043b8edcf36b28f13a93d0860dc9609d9b46eded81bc004e4149113e9eaad8b4d2cc18164942588bd4e97ecd8fce4f9afd8e537bc668b16

Download Submit
memory/636-0-0x00007FFD37FB3000-0x00007FFD37FB5000-memory.dmp

Filesize
8KB

Download
memory/636-1-0x0000000000100000-0x0000000000424000-memory.dmp

Filesize
3.1MB

Download
memory/636-2-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/636-9-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/736-10-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/736-11-0x000000001BF60000-0x000000001BFB0000-memory.dmp

Filesize
320KB

Download
memory/736-12-0x000000001D1C0000-0x000000001D272000-memory.dmp

Filesize
712KB

Download
memory/736-15-0x000000001D130000-0x000000001D142000-memory.dmp

Filesize
72KB

Download
memory/736-16-0x000000001D5C0000-0x000000001D5FC000-memory.dmp

Filesize
240KB

Download
memory/736-18-0x00007FFD37FB0000-0x00007FFD38A71000-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