a8592530826bffe4e397e6f53054c366cef50d567bc9f54ddb4c4a960cb21537

System Information Discovery

Processes:

DIAGRAM.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	DIAGRAM.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	DIAGRAM.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

Processes:

DIAGRAM.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	DIAGRAM.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

41 whatismyipaddress.com

flow	ioc
41	whatismyipaddress.com

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

Processes:

DIAGRAM.exe

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

Suspicious use of SetThreadContext 1 IoCs

Processes:

DIAGRAM.exe

description pid process target process

PID 4072 set thread context of 100 4072 DIAGRAM.exe MSBuild.exe
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

Processes:

schtasks.exe

pid process

3976 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

DIAGRAM.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 4072 DIAGRAM.exe
Token: SeDebugPrivilege 100 MSBuild.exe

description	pid	process	target process
PID 4072 set thread context of 100	4072	DIAGRAM.exe	MSBuild.exe

pid	process
3976	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4072	DIAGRAM.exe
Token: SeDebugPrivilege	100	MSBuild.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

DIAGRAM.exe

description	pid	process	target process
PID 4072 wrote to memory of 3976	4072	DIAGRAM.exe	schtasks.exe
PID 4072 wrote to memory of 3976	4072	DIAGRAM.exe	schtasks.exe
PID 4072 wrote to memory of 3976	4072	DIAGRAM.exe	schtasks.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe
PID 4072 wrote to memory of 100	4072	DIAGRAM.exe	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\DIAGRAM.exe
"C:\Users\Admin\AppData\Local\Temp\DIAGRAM.exe"
1⤵
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4072

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\NurSHgGUQC" /XML "C:\Users\Admin\AppData\Local\Temp\tmp2C3B.tmp"
2⤵
- Creates scheduled task(s)
PID:3976

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
"{path}"
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:100

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

5

Virtualization/Sandbox Evasion

2

T1497

System Information Discovery

4

Peripheral Device Discovery