agenttesla | b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Oracle\VirtualBox Guest Additions	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.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	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.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	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-2275444769-3691835758-4097679484-1000\Control Panel\International\Geo\Nation	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegSvcs.exe
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegSvcs.exe
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegSvcs.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yGbzOMp = "C:\\Users\\Admin\\AppData\\Roaming\\yGbzOMp\\yGbzOMp.exe"	RegSvcs.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	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3508 set thread context of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1948	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe
Token: SeDebugPrivilege	4976	RegSvcs.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3508 wrote to memory of 1948	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	95
PID 3508 wrote to memory of 1948	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	95
PID 3508 wrote to memory of 1948	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	95
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97
PID 3508 wrote to memory of 4976	3508	b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe	97

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegSvcs.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegSvcs.exe

C:\Users\Admin\AppData\Local\Temp\b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe
"C:\Users\Admin\AppData\Local\Temp\b4ac1514451ab0ddf9ff7f7f875125d2754f99a416e0746cbc2b6acc739f9e59.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3508
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\YmoJJTwEDa" /XML "C:\Users\Admin\AppData\Local\Temp\tmpEBDC.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1948
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "{path}"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:4976

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

2

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

4

Virtualization/Sandbox Evasion

2

Lateral Movement

Collection

Email Collection