amadey | 91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361

Virtualization/Sandbox Evasion

Processes:

91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exechrosha.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	chrosha.exe

Blocklisted process makes network request 2 IoCs

Processes:

rundll32.exerundll32.exe

flow pid process

3 1804 rundll32.exe
6 4508 rundll32.exe
Downloads MZ/PE file

flow	pid	process
3	1804	rundll32.exe
6	4508	rundll32.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

T1082

Processes:

91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exechrosha.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	chrosha.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	chrosha.exe

Executes dropped EXE 1 IoCs

Processes:

chrosha.exe

pid process

4192 chrosha.exe

pid	process
4192	chrosha.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

Processes:

91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exechrosha.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2718508534-2116753757-2794822388-1000\Software\Wine	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
Key opened	\REGISTRY\USER\S-1-5-21-2718508534-2116753757-2794822388-1000\Software\Wine	chrosha.exe

Loads dropped DLL 3 IoCs

Processes:

rundll32.exerundll32.exerundll32.exe

pid process

952 rundll32.exe
1804 rundll32.exe
4508 rundll32.exe
Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
Reads local data of messenger clients 2 TTPs
Infostealers often target stored data of messaging applications, which can include saved credentials and account information.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exechrosha.exe

pid process

4444 91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
4192 chrosha.exe
Drops file in Windows directory 1 IoCs

Processes:

91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe

description ioc process

File created C:\Windows\Tasks\chrosha.job 91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
952	rundll32.exe
1804	rundll32.exe
4508	rundll32.exe

description	ioc	process
File created	C:\Windows\Tasks\chrosha.job	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

Processes:

91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exechrosha.exerundll32.exepowershell.exe

pid	process
4444	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
4444	91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
4192	chrosha.exe
4192	chrosha.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
1804	rundll32.exe
3652	powershell.exe
3652	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 3652 powershell.exe

description	pid	process
Token: SeDebugPrivilege	3652	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

chrosha.exerundll32.exerundll32.exe

description	pid	process	target process
PID 4192 wrote to memory of 952	4192	chrosha.exe	rundll32.exe
PID 4192 wrote to memory of 952	4192	chrosha.exe	rundll32.exe
PID 4192 wrote to memory of 952	4192	chrosha.exe	rundll32.exe
PID 952 wrote to memory of 1804	952	rundll32.exe	rundll32.exe
PID 952 wrote to memory of 1804	952	rundll32.exe	rundll32.exe
PID 1804 wrote to memory of 2944	1804	rundll32.exe	netsh.exe
PID 1804 wrote to memory of 2944	1804	rundll32.exe	netsh.exe
PID 1804 wrote to memory of 3652	1804	rundll32.exe	powershell.exe
PID 1804 wrote to memory of 3652	1804	rundll32.exe	powershell.exe
PID 4192 wrote to memory of 4508	4192	chrosha.exe	rundll32.exe
PID 4192 wrote to memory of 4508	4192	chrosha.exe	rundll32.exe
PID 4192 wrote to memory of 4508	4192	chrosha.exe	rundll32.exe

C:\Users\Admin\AppData\Local\Temp\91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe
"C:\Users\Admin\AppData\Local\Temp\91fc99ec103c92401dfb40e340b83d279854777ab894c547235aceb0842d0361.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:4444

C:\Users\Admin\AppData\Local\Temp\4d0ab15804\chrosha.exe
C:\Users\Admin\AppData\Local\Temp\4d0ab15804\chrosha.exe
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Executes dropped EXE
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4192

C:\Windows\SysWOW64\rundll32.exe
"C:\Windows\System32\rundll32.exe" C:\Users\Admin\AppData\Roaming\c1ec479e5342a2\cred64.dll, Main
2⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:952

C:\Windows\system32\rundll32.exe
"C:\Windows\System32\rundll32.exe" C:\Users\Admin\AppData\Roaming\c1ec479e5342a2\cred64.dll, Main
3⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1804

C:\Windows\system32\netsh.exe
netsh wlan show profiles
4⤵
PID:2944

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -Command Compress-Archive -Path 'C:\Users\Admin\AppData\Local\Temp\_Files_\' -DestinationPath 'C:\Users\Admin\AppData\Local\Temp\718508534211_Desktop.zip' -CompressionLevel Optimal
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3652

C:\Windows\SysWOW64\rundll32.exe
"C:\Windows\System32\rundll32.exe" C:\Users\Admin\AppData\Roaming\c1ec479e5342a2\clip64.dll, Main
2⤵
- Blocklisted process makes network request
- Loads dropped DLL
PID:4508

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

Credential Access

Unsecured Credentials

3

T1552

Credentials In Files

T1552.001

Credentials in Registry

1

T1552.002

Discovery

Query Registry

3

System Information Discovery

T1082

Virtualization/Sandbox Evasion