quasar | 9764bc832bfa8a9f3d7af1ea6747e7376774bd903e9cc545d9998f2657e97fa3

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
13/12/2024, 09:58

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General

Target

RuntimeBroker.exe
Size

3.1MB
MD5

57145c33045ce67e1c1fe7c763438ab1
SHA1

2a83ecef8bbe640577a2cc3f6602bbd8e7d6c847
SHA256

9764bc832bfa8a9f3d7af1ea6747e7376774bd903e9cc545d9998f2657e97fa3
SHA512

7ce3d6dbd3c3b05ff6fe1ac57888123cf5e01e890c5b5e7204859b361841d15fdb8a460626355236b9c3df58824cb1979c187f34fa6d7d282517023f3a26a112
SSDEEP

49152:uvHI22SsaNYfdPBldt698dBcjH/N/9oGduTHHB72eh2NT:uvo22SsaNYfdPBldt6+dBcjH/Nl

Score

10^/10

quasar runtimebroker spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

RuntimeBroker

qrpn9be.localto.net:2810

Mutex

fc5edab1-6e8f-4963-98aa-bd077e08750f

Attributes

encryption_key
F749DCAC94A1FC3102D2B0CFBBFCB76086F86568
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RuntimeBroker
subdirectory
a7

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/3888-1-0x00000000000A0000-0x00000000003C4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b83-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4796	RuntimeBroker.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\a7	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\a7\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\a7	RuntimeBroker.exe
File created	C:\Windows\system32\a7\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\a7\RuntimeBroker.exe	RuntimeBroker.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
4492	schtasks.exe
412	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3888	RuntimeBroker.exe
Token: SeDebugPrivilege	4796	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4796	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3888 wrote to memory of 4492	3888	RuntimeBroker.exe	83
PID 3888 wrote to memory of 4492	3888	RuntimeBroker.exe	83
PID 3888 wrote to memory of 4796	3888	RuntimeBroker.exe	85
PID 3888 wrote to memory of 4796	3888	RuntimeBroker.exe	85
PID 4796 wrote to memory of 412	4796	RuntimeBroker.exe	86
PID 4796 wrote to memory of 412	4796	RuntimeBroker.exe	86

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\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3888
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Windows\system32\a7\RuntimeBroker.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4492
- C:\Windows\system32\a7\RuntimeBroker.exe
  "C:\Windows\system32\a7\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4796
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Windows\system32\a7\RuntimeBroker.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:412

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Windows\System32\a7\RuntimeBroker.exe

Filesize
3.1MB

MD5
57145c33045ce67e1c1fe7c763438ab1

SHA1
2a83ecef8bbe640577a2cc3f6602bbd8e7d6c847

SHA256
9764bc832bfa8a9f3d7af1ea6747e7376774bd903e9cc545d9998f2657e97fa3

SHA512
7ce3d6dbd3c3b05ff6fe1ac57888123cf5e01e890c5b5e7204859b361841d15fdb8a460626355236b9c3df58824cb1979c187f34fa6d7d282517023f3a26a112

Download Submit
memory/3888-0-0x00007FFE642D3000-0x00007FFE642D5000-memory.dmp

Filesize
8KB

Download
memory/3888-1-0x00000000000A0000-0x00000000003C4000-memory.dmp

Filesize
3.1MB

Download
memory/4796-9-0x00007FFE642D0000-0x00007FFE64D91000-memory.dmp

Filesize
10.8MB

Download
memory/4796-10-0x000000001D650000-0x000000001D6A0000-memory.dmp

Filesize
320KB

Download
memory/4796-11-0x000000001D760000-0x000000001D812000-memory.dmp

Filesize
712KB

Download
memory/4796-12-0x00007FFE642D0000-0x00007FFE64D91000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads