formbook | 71381247497fba4f3392ddd62fe162201e0085a9afe1b3b9d62e7c15281d86e2

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	PIsept2020.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	PIsept2020.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	PIsept2020.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	PIsept2020.exe

Formbook payload 2 IoCs

rat

resource	yara_rule
behavioral2/memory/3344-58-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral2/memory/3344-63-0x0000000000400000-0x000000000042E000-memory.dmp	formbook

Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions	PIsept2020.exe

Looks for VMWare Tools registry key 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\VMware, Inc.\VMware Tools	PIsept2020.exe

Checks BIOS information in registry 2 TTPs 2 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	PIsept2020.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	PIsept2020.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	PIsept2020.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	PIsept2020.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\3FYL-6HXC0E = "C:\\Program Files (x86)\\Ytbmd\\tzthzlbvud.exe"	chkdsk.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	PIsept2020.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	PIsept2020.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 540 set thread context of 3344	540	PIsept2020.exe	102
PID 3344 set thread context of 3524	3344	PIsept2020.exe	56
PID 1884 set thread context of 3524	1884	chkdsk.exe	56

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Ytbmd\tzthzlbvud.exe	chkdsk.exe

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PIsept2020.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chkdsk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

description	ioc	Process
Key created	\Registry\User\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 38 IoCs

pid	Process
1652	powershell.exe
1652	powershell.exe
3344	PIsept2020.exe
3344	PIsept2020.exe
3344	PIsept2020.exe
3344	PIsept2020.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
3344	PIsept2020.exe
3344	PIsept2020.exe
3344	PIsept2020.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe
1884	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1652	powershell.exe
Token: SeDebugPrivilege	3344	PIsept2020.exe
Token: SeDebugPrivilege	1884	chkdsk.exe
Token: SeShutdownPrivilege	3524	Explorer.EXE
Token: SeCreatePagefilePrivilege	3524	Explorer.EXE
Token: SeShutdownPrivilege	3524	Explorer.EXE
Token: SeCreatePagefilePrivilege	3524	Explorer.EXE

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 540 wrote to memory of 1652	540	PIsept2020.exe	100
PID 540 wrote to memory of 1652	540	PIsept2020.exe	100
PID 540 wrote to memory of 1652	540	PIsept2020.exe	100
PID 540 wrote to memory of 3344	540	PIsept2020.exe	102
PID 540 wrote to memory of 3344	540	PIsept2020.exe	102
PID 540 wrote to memory of 3344	540	PIsept2020.exe	102
PID 540 wrote to memory of 3344	540	PIsept2020.exe	102
PID 540 wrote to memory of 3344	540	PIsept2020.exe	102
PID 540 wrote to memory of 3344	540	PIsept2020.exe	102
PID 3524 wrote to memory of 1884	3524	Explorer.EXE	103
PID 3524 wrote to memory of 1884	3524	Explorer.EXE	103
PID 3524 wrote to memory of 1884	3524	Explorer.EXE	103
PID 1884 wrote to memory of 372	1884	chkdsk.exe	105
PID 1884 wrote to memory of 372	1884	chkdsk.exe	105
PID 1884 wrote to memory of 372	1884	chkdsk.exe	105
PID 1884 wrote to memory of 4564	1884	chkdsk.exe	107
PID 1884 wrote to memory of 4564	1884	chkdsk.exe	107
PID 1884 wrote to memory of 4564	1884	chkdsk.exe	107
PID 1884 wrote to memory of 3300	1884	chkdsk.exe	109
PID 1884 wrote to memory of 3300	1884	chkdsk.exe	109
PID 1884 wrote to memory of 3300	1884	chkdsk.exe	109

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3524
- C:\Users\Admin\AppData\Local\Temp\PIsept2020.exe
  "C:\Users\Admin\AppData\Local\Temp\PIsept2020.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Looks for VirtualBox Guest Additions in registry
  - Looks for VMWare Tools registry key
  - Checks BIOS information in registry
  - Windows security modification
  - Maps connected drives based on registry
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:540
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1652
- - C:\Users\Admin\AppData\Local\Temp\PIsept2020.exe
    "C:\Users\Admin\AppData\Local\Temp\PIsept2020.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:3344
- C:\Windows\SysWOW64\chkdsk.exe
  "C:\Windows\SysWOW64\chkdsk.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Enumerates system info in registry
  - Modifies Internet Explorer settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1884
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\PIsept2020.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:372
- - C:\Windows\SysWOW64\cmd.exe
    /c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4564
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:3300

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

Virtualization/Sandbox Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion