quasar | 16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730

General

Target

16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.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 2 IoCs

resource	yara_rule
behavioral2/memory/2592-1-0x00000000007B0000-0x0000000000AD4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b91-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4472	RuntimeBroker.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\winrn\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\winrn	RuntimeBroker.exe
File created	C:\Windows\system32\winrn\RuntimeBroker.exe	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe
File opened for modification	C:\Windows\system32\winrn\RuntimeBroker.exe	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe
File opened for modification	C:\Windows\system32\winrn	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.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
4796	schtasks.exe
1688	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2592	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe
Token: SeDebugPrivilege	4472	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4472	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2592 wrote to memory of 4796	2592	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe	83
PID 2592 wrote to memory of 4796	2592	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe	83
PID 2592 wrote to memory of 4472	2592	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe	85
PID 2592 wrote to memory of 4472	2592	16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe	85
PID 4472 wrote to memory of 1688	4472	RuntimeBroker.exe	86
PID 4472 wrote to memory of 1688	4472	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\16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe
"C:\Users\Admin\AppData\Local\Temp\16898c06cd100b7132bb2cde538cd45ae691cd87045f2ef05727261cb4328730.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2592
- 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:4796
- 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:4472
- - 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:1688

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/2592-0-0x00007FFA3CB73000-0x00007FFA3CB75000-memory.dmp

Filesize
8KB

Download
memory/2592-1-0x00000000007B0000-0x0000000000AD4000-memory.dmp

Filesize
3.1MB

Download
memory/2592-2-0x00007FFA3CB70000-0x00007FFA3D631000-memory.dmp

Filesize
10.8MB

Download
memory/2592-10-0x00007FFA3CB70000-0x00007FFA3D631000-memory.dmp

Filesize
10.8MB

Download
memory/4472-9-0x00007FFA3CB70000-0x00007FFA3D631000-memory.dmp

Filesize
10.8MB

Download
memory/4472-11-0x000000001D180000-0x000000001D1D0000-memory.dmp

Filesize
320KB

Download
memory/4472-12-0x000000001D7C0000-0x000000001D872000-memory.dmp

Filesize
712KB

Download
memory/4472-13-0x00007FFA3CB70000-0x00007FFA3D631000-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