21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08

General

Target
_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe
Size 36KB
Sample260704-evhvdaaz2t
SHA256 21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08
MD5 41d5a8b371c3ab12a6317c52e70aa1d9
SHA1 54801da27ec7f9f5f9bf069d0c976dcb35f1f75d
SHA512 b35a0e70f59f7037959558e3e4e8df9ed0dd557d2baba3fc283212da4246f865ad988cb907258e9ac6a4022dbc328b958d597099068ccb8f0d7e5dec88a31d3e
SSDEEP 768:aMttvjOzE1fVK8a/aJb2l1Xa7NC/M3zL+33sWGS6G6Du:aMjOzgfAatA1M3/+33RGDu
TLSH
T11CF2E64BB6C370FDC617C630D6A71FB2B534B8901622AEBFA7D4C63219137911626F29
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

Malware Config

Signatures

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RuntimeBroker.exe	_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe

Executes dropped EXE 3 IoCs

pid	Process
2656	RuntimeBroker.exe
5932	RuntimeBroker.exe
6112	HealthService.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1749168396-1890032557-311772428-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\RuntimeBroker\\RuntimeBroker.exe"	_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1749168396-1890032557-311772428-1000\Software\Microsoft\Windows\CurrentVersion\Run\SecurityHealth = "C:\\Users\\Admin\\AppData\\Local\\Microsoft\\Windows\\Security\\Health\\HealthService.exe"	_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5468	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2656	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2656	RuntimeBroker.exe
2656	RuntimeBroker.exe
2656	RuntimeBroker.exe
2656	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5732 wrote to memory of 5468	5732	_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe	89
PID 5732 wrote to memory of 2656	5732	_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe	91
PID 2656 wrote to memory of 4852	2656	RuntimeBroker.exe	96
PID 2656 wrote to memory of 5848	2656	RuntimeBroker.exe	98
PID 2656 wrote to memory of 5868	2656	RuntimeBroker.exe	100
PID 2656 wrote to memory of 3200	2656	RuntimeBroker.exe	102

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\_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe
"C:\Users\Admin\AppData\Local\Temp\_21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:5732
- C:\Windows\SYSTEM32\schtasks.exe
  schtasks /create /tn "MicrosoftRuntimeBroker" /tr "C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\Health\HealthService.exe" /sc daily /st 00:00 /rl limited /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5468
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\RuntimeBroker\RuntimeBroker.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\RuntimeBroker\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2656
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /query /tn "MicrosoftRuntimeBroker"
    3⤵
    PID:4852
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /query /tn "MicrosoftRuntimeBroker"
    3⤵
    PID:5848
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /query /tn "MicrosoftRuntimeBroker"
    3⤵
    PID:5868
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /query /tn "MicrosoftRuntimeBroker"
    3⤵
    PID:3200

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\RuntimeBroker\RuntimeBroker.exe
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\RuntimeBroker\RuntimeBroker.exe
1⤵
- Executes dropped EXE
PID:5932

C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\Health\HealthService.exe
C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\Health\HealthService.exe
1⤵
- Executes dropped EXE
PID:6112

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

RuntimeBroker.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\RuntimeBroker\RuntimeBroker.exe
Size 36KB
SHA256 21f7f398bff8669321cb19020bcb6f64e7229695ff5f7f61ab684ab2dcbeba08
MD5 41d5a8b371c3ab12a6317c52e70aa1d9
SHA1 54801da27ec7f9f5f9bf069d0c976dcb35f1f75d
SHA512 b35a0e70f59f7037959558e3e4e8df9ed0dd557d2baba3fc283212da4246f865ad988cb907258e9ac6a4022dbc328b958d597099068ccb8f0d7e5dec88a31d3e
SSDEEP 768:aMttvjOzE1fVK8a/aJb2l1Xa7NC/M3zL+33sWGS6G6Du:aMjOzgfAatA1M3/+33RGDu
TLSH
T11CF2E64BB6C370FDC617C630D6A71FB2B534B8901622AEBFA7D4C63219137911626F29
MD5 SHA1 SHA512 SSDEEP TLSH

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads