quasar | bee2d43221fbe8e03ffbc29a0e60710795f05d2e597a94bae18cc84ebd0528db

Analysis

max time kernel
121s
max time network
123s
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, 17:33

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Reason

Machine shutdown

General

Target
lolgg.exe
Size 3.1MB
Sample240227-v4wetsfb44
SHA256 bee2d43221fbe8e03ffbc29a0e60710795f05d2e597a94bae18cc84ebd0528db
MD5 0cb1197add877a20756fb8174a10a0ef
SHA1 1c4cb81073becc1ab4d51dbd65eec82d91a854f8
SHA512 d57a0ac85433d9e56f871e8125fb5ce24cd00f466b7ee31a3df4f94aed2034990ef0520854cf7d2ed739214b177ef4b190ea259aec4975538b325c2844cf6aff
SSDEEP 49152:uvyI22SsaNYfdPBldt698dBcjHo//IE2HXk/uVXoGdbTHHB72eh2NT:uvf22SsaNYfdPBldt6+dBcjHo//Ep
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
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 payload 2 IoCs

resource	yara_rule
behavioral2/memory/1708-0-0x00000000005E0000-0x0000000000904000-memory.dmp	family_quasar
behavioral2/files/0x000a0000000231a5-6.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-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
4488	Client.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
1028	schtasks.exe
3860	schtasks.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "54"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	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\DWM\AccentColor = "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
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\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\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1708	lolgg.exe
Token: SeDebugPrivilege	4488	Client.exe
Token: SeShutdownPrivilege	3988	shutdown.exe
Token: SeRemoteShutdownPrivilege	3988	shutdown.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4488	Client.exe
3472	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1708 wrote to memory of 1028	1708	lolgg.exe	93
PID 1708 wrote to memory of 1028	1708	lolgg.exe	93
PID 1708 wrote to memory of 4488	1708	lolgg.exe	94
PID 1708 wrote to memory of 4488	1708	lolgg.exe	94
PID 4488 wrote to memory of 3860	4488	Client.exe	95
PID 4488 wrote to memory of 3860	4488	Client.exe	95
PID 4488 wrote to memory of 3988	4488	Client.exe	103
PID 4488 wrote to memory of 3988	4488	Client.exe	103

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\lolgg.exe
"C:\Users\Admin\AppData\Local\Temp\lolgg.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1708
- 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⤵
  - Creates scheduled task(s)
  PID:1028
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4488
- - 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⤵
    - Creates scheduled task(s)
    PID:3860
- - C:\Windows\System32\shutdown.exe
    "C:\Windows\System32\shutdown.exe" /s /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:3988

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3956855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3472

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

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 bee2d43221fbe8e03ffbc29a0e60710795f05d2e597a94bae18cc84ebd0528db
MD5 0cb1197add877a20756fb8174a10a0ef
SHA1 1c4cb81073becc1ab4d51dbd65eec82d91a854f8
SHA512 d57a0ac85433d9e56f871e8125fb5ce24cd00f466b7ee31a3df4f94aed2034990ef0520854cf7d2ed739214b177ef4b190ea259aec4975538b325c2844cf6aff
SSDEEP 49152:uvyI22SsaNYfdPBldt698dBcjHo//IE2HXk/uVXoGdbTHHB72eh2NT:uvf22SsaNYfdPBldt6+dBcjHo//Ep
MD5 SHA1 SHA512 SSDEEP

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memory/1708-0-0x00000000005E0000-0x0000000000904000-memory.dmp

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memory/1708-1-0x00007FF8ECD70000-0x00007FF8ED831000-memory.dmp

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memory/1708-2-0x000000001B510000-0x000000001B520000-memory.dmp

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memory/1708-10-0x00007FF8ECD70000-0x00007FF8ED831000-memory.dmp

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memory/4488-11-0x0000000000C30000-0x0000000000C40000-memory.dmp

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memory/4488-9-0x00007FF8ECD70000-0x00007FF8ED831000-memory.dmp

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memory/4488-12-0x0000000002620000-0x0000000002670000-memory.dmp

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memory/4488-13-0x000000001B870000-0x000000001B922000-memory.dmp

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memory/4488-14-0x000000001BF60000-0x000000001C488000-memory.dmp

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memory/4488-16-0x00007FF8ECD70000-0x00007FF8ED831000-memory.dmp

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memory/4488-17-0x0000000000C30000-0x0000000000C40000-memory.dmp

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memory/4488-18-0x000000001B7D0000-0x000000001B7E2000-memory.dmp

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memory/4488-19-0x000000001B830000-0x000000001B86C000-memory.dmp

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memory/4488-22-0x00007FF8ECD70000-0x00007FF8ED831000-memory.dmp

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Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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