amadey | 3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e

Virtualization/Sandbox Evasion

Processes:

3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exechrosha.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.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 3836 rundll32.exe
4 3088 rundll32.exe
Downloads MZ/PE file

flow	pid	process
3	3836	rundll32.exe
4	3088	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:

chrosha.exe3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	chrosha.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	chrosha.exe

Executes dropped EXE 1 IoCs

Processes:

chrosha.exe

pid process

3692 chrosha.exe

pid	process
3692	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:

3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exechrosha.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3777591257-2471171023-3629228286-1000\Software\Wine	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
Key opened	\REGISTRY\USER\S-1-5-21-3777591257-2471171023-3629228286-1000\Software\Wine	chrosha.exe

Loads dropped DLL 3 IoCs

Processes:

rundll32.exerundll32.exerundll32.exe

pid process

4508 rundll32.exe
3836 rundll32.exe
3088 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:

3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exechrosha.exe

pid process

2896 3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
3692 chrosha.exe
Drops file in Windows directory 1 IoCs

Processes:

3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe

description ioc process

File created C:\Windows\Tasks\chrosha.job 3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
4508	rundll32.exe
3836	rundll32.exe
3088	rundll32.exe

description	ioc	process
File created	C:\Windows\Tasks\chrosha.job	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

Processes:

3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exechrosha.exerundll32.exepowershell.exe

pid	process
2896	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
2896	3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
3692	chrosha.exe
3692	chrosha.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
3836	rundll32.exe
4436	powershell.exe
4436	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 4436 powershell.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe

pid process

2896 3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe

description	pid	process
Token: SeDebugPrivilege	4436	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

chrosha.exerundll32.exerundll32.exe

description	pid	process	target process
PID 3692 wrote to memory of 4508	3692	chrosha.exe	rundll32.exe
PID 3692 wrote to memory of 4508	3692	chrosha.exe	rundll32.exe
PID 3692 wrote to memory of 4508	3692	chrosha.exe	rundll32.exe
PID 4508 wrote to memory of 3836	4508	rundll32.exe	rundll32.exe
PID 4508 wrote to memory of 3836	4508	rundll32.exe	rundll32.exe
PID 3836 wrote to memory of 1896	3836	rundll32.exe	netsh.exe
PID 3836 wrote to memory of 1896	3836	rundll32.exe	netsh.exe
PID 3836 wrote to memory of 4436	3836	rundll32.exe	powershell.exe
PID 3836 wrote to memory of 4436	3836	rundll32.exe	powershell.exe
PID 3692 wrote to memory of 3088	3692	chrosha.exe	rundll32.exe
PID 3692 wrote to memory of 3088	3692	chrosha.exe	rundll32.exe
PID 3692 wrote to memory of 3088	3692	chrosha.exe	rundll32.exe

C:\Users\Admin\AppData\Local\Temp\3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.exe
"C:\Users\Admin\AppData\Local\Temp\3e3f4561497bb4c84871561e45fdec73f4f0389292b83f32ba29b1ebd350ce8e.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
- Suspicious use of FindShellTrayWindow
PID:2896

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:3692

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:4508

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:3836

C:\Windows\system32\netsh.exe
netsh wlan show profiles
4⤵
PID:1896

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\777591257247_Desktop.zip' -CompressionLevel Optimal
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4436

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:3088

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