quasar | 16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730

General

Target

RuntimeBroker.exe
Size

3.1MB
MD5

93b0fa3d2291d7d09ceed2411f99596b
SHA1

1551e1ccc18576463e0b8c72aa6df57dd0dc935e
SHA256

16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730
SHA512

c530a129d4684c77bf42c6d1d9dffa428297f9279e273ecb3b358b24b618ca5a64d269225260930c740a37046ccd330e385fbab71f78c364d7ea0641f853722b
SSDEEP

49152:6vxI22SsaNYfdPBldt698dBcjHW7HkmztEoGdyNdTHHB72eh2NT:6vi22SsaNYfdPBldt6+dBcjHW7HQi

Score

10^/10

quasar runtimebroker spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

RuntimeBroker

C2

Cmaster-57540.portmap.io:57540

Mutex

2b1bd80e-8434-44d0-8591-7df9c98096ff

Attributes

encryption_key
25413ECFFC7EFB26F72ADF36F586C28A365109DC
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
1500
startup_key
RuntimeBroker
subdirectory
winrn

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2340-1-0x0000000000360000-0x0000000000684000-memory.dmp	family_quasar
behavioral1/files/0x00090000000162e4-5.dat	family_quasar
behavioral1/memory/2844-9-0x00000000008C0000-0x0000000000BE4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2844	RuntimeBroker.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\winrn\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\winrn\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\winrn	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\winrn\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\winrn	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
1892	schtasks.exe
2760	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2340	RuntimeBroker.exe
Token: SeDebugPrivilege	2844	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2844	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2340 wrote to memory of 1892	2340	RuntimeBroker.exe	30
PID 2340 wrote to memory of 1892	2340	RuntimeBroker.exe	30
PID 2340 wrote to memory of 1892	2340	RuntimeBroker.exe	30
PID 2340 wrote to memory of 2844	2340	RuntimeBroker.exe	32
PID 2340 wrote to memory of 2844	2340	RuntimeBroker.exe	32
PID 2340 wrote to memory of 2844	2340	RuntimeBroker.exe	32
PID 2844 wrote to memory of 2760	2844	RuntimeBroker.exe	33
PID 2844 wrote to memory of 2760	2844	RuntimeBroker.exe	33
PID 2844 wrote to memory of 2760	2844	RuntimeBroker.exe	33

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:2340
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Windows\system32\winrn\RuntimeBroker.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1892
- C:\Windows\system32\winrn\RuntimeBroker.exe
  "C:\Windows\system32\winrn\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2844
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Windows\system32\winrn\RuntimeBroker.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2760

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

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\winrn\RuntimeBroker.exe

Filesize
3.1MB

MD5
93b0fa3d2291d7d09ceed2411f99596b

SHA1
1551e1ccc18576463e0b8c72aa6df57dd0dc935e

SHA256
16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730

SHA512
c530a129d4684c77bf42c6d1d9dffa428297f9279e273ecb3b358b24b618ca5a64d269225260930c740a37046ccd330e385fbab71f78c364d7ea0641f853722b

Download Submit
memory/2340-0-0x000007FEF58F3000-0x000007FEF58F4000-memory.dmp

Filesize
4KB

Download
memory/2340-1-0x0000000000360000-0x0000000000684000-memory.dmp

Filesize
3.1MB

Download
memory/2340-2-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2340-10-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2844-8-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2844-9-0x00000000008C0000-0x0000000000BE4000-memory.dmp

Filesize
3.1MB

Download
memory/2844-11-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2844-12-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download
memory/2844-13-0x000007FEF58F0000-0x000007FEF62DC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads