dcrat | c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	ReviewdriversavesBrokercrtwinDhcp1.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	ReviewdriversavesBrokercrtwinDhcp1.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	ReviewdriversavesBrokercrtwinDhcp1.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation	c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3.exe
Key value queried	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation	ReviewdriversavesBrokercrtwinDhcp1.exe

Executes dropped EXE 2 IoCs

pid	Process
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
3436	RuntimeBroker.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Software\Wine	ReviewdriversavesBrokercrtwinDhcp1.exe
Key opened	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Software\Wine	RuntimeBroker.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	ReviewdriversavesBrokercrtwinDhcp1.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RuntimeBroker.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
24	ipinfo.io
25	ipinfo.io

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	ReviewdriversavesBrokercrtwinDhcp1.exe
File opened for modification	\??\PhysicalDrive0	RuntimeBroker.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
3436	RuntimeBroker.exe

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files\Windows Multimedia Platform\9e8d7a4ca61bd9	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files\Windows Security\BrowserCore\fontdrvhost.exe	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files\Windows Security\BrowserCore\5b884080fd4f94	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files\Windows Portable Devices\RuntimeBroker.exe	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files (x86)\Internet Explorer\images\smss.exe	ReviewdriversavesBrokercrtwinDhcp1.exe
File opened for modification	C:\Program Files (x86)\Internet Explorer\images\smss.exe	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files (x86)\Internet Explorer\images\69ddcba757bf72	ReviewdriversavesBrokercrtwinDhcp1.exe
File created	C:\Program Files\Windows Portable Devices\9e8d7a4ca61bd9	ReviewdriversavesBrokercrtwinDhcp1.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System\Speech\csrss.exe	ReviewdriversavesBrokercrtwinDhcp1.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 21 IoCs

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

persistence

Scheduled Task/Job

pid	Process
3984	schtasks.exe
2212	schtasks.exe
3272	schtasks.exe
4500	schtasks.exe
2196	schtasks.exe
4912	schtasks.exe
2268	schtasks.exe
896	schtasks.exe
2236	schtasks.exe
736	schtasks.exe
4628	schtasks.exe
4920	schtasks.exe
4108	schtasks.exe
5012	schtasks.exe
4520	schtasks.exe
4724	schtasks.exe
1020	schtasks.exe
3772	schtasks.exe
4132	schtasks.exe
1592	schtasks.exe
2996	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000_Classes\Local Settings	ReviewdriversavesBrokercrtwinDhcp1.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
4192	ReviewdriversavesBrokercrtwinDhcp1.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe
3436	RuntimeBroker.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3436	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4192	ReviewdriversavesBrokercrtwinDhcp1.exe
Token: SeDebugPrivilege	3436	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4448 wrote to memory of 4192	4448	c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3.exe	82
PID 4448 wrote to memory of 4192	4448	c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3.exe	82
PID 4448 wrote to memory of 4192	4448	c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3.exe	82
PID 4192 wrote to memory of 948	4192	ReviewdriversavesBrokercrtwinDhcp1.exe	108
PID 4192 wrote to memory of 948	4192	ReviewdriversavesBrokercrtwinDhcp1.exe	108
PID 4192 wrote to memory of 948	4192	ReviewdriversavesBrokercrtwinDhcp1.exe	108
PID 948 wrote to memory of 4664	948	cmd.exe	110
PID 948 wrote to memory of 4664	948	cmd.exe	110
PID 948 wrote to memory of 4664	948	cmd.exe	110
PID 4664 wrote to memory of 1292	4664	w32tm.exe	111
PID 4664 wrote to memory of 1292	4664	w32tm.exe	111
PID 948 wrote to memory of 3436	948	cmd.exe	116
PID 948 wrote to memory of 3436	948	cmd.exe	116
PID 948 wrote to memory of 3436	948	cmd.exe	116

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\c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3.exe
"C:\Users\Admin\AppData\Local\Temp\c642f9a142a0c2f9c34ba9b302dc88af2df41db5b9c875e26d39572a67f61cf3.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4448
- C:\Users\Admin\AppData\Local\Temp\ReviewdriversavesBrokercrtwinDhcp1.exe
  "C:\Users\Admin\AppData\Local\Temp\ReviewdriversavesBrokercrtwinDhcp1.exe"
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Checks computer location settings
  - Executes dropped EXE
  - Identifies Wine through registry keys
  - Checks whether UAC is enabled
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Drops file in Program Files directory
  - Drops file in Windows directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4192
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\tRQxi6UI1P.bat"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:948
  - - C:\Windows\SysWOW64\w32tm.exe
      w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4664
    - - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        5⤵
        
        PID:1292
  - - C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
      "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
      4⤵
      Identifies VirtualBox via ACPI registry values (likely anti-VM)
      Checks BIOS information in registry
      Executes dropped EXE
      Identifies Wine through registry keys
      Checks whether UAC is enabled
      Writes to the Master Boot Record (MBR)
      Suspicious use of NtSetInformationThreadHideFromDebugger
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of AdjustPrivilegeToken
      PID:3436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Internet Explorer\images\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:5012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\images\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4500

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Internet Explorer\images\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2196

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4132

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\All Users\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2236

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Security\BrowserCore\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1592

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Windows Security\BrowserCore\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Security\BrowserCore\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2996

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3984

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:896

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2268

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2212

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3272

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4108

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Virtualization/Sandbox Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

System Information Discovery

Virtualization/Sandbox Evasion