amadey | 3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a

Virtualization/Sandbox Evasion

Processes:

3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exechrosha.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.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 2564 rundll32.exe
4 908 rundll32.exe
Downloads MZ/PE file

flow	pid	process
3	2564	rundll32.exe
4	908	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:

3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exechrosha.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.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

4972 chrosha.exe

pid	process
4972	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:

3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exechrosha.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-801765966-3955847401-2235691403-1000\Software\Wine	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
Key opened	\REGISTRY\USER\S-1-5-21-801765966-3955847401-2235691403-1000\Software\Wine	chrosha.exe

Loads dropped DLL 3 IoCs

Processes:

rundll32.exerundll32.exerundll32.exe

pid process

736 rundll32.exe
2564 rundll32.exe
908 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:

3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exechrosha.exe

pid process

2696 3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
4972 chrosha.exe
Drops file in Windows directory 1 IoCs

Processes:

3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe

description ioc process

File created C:\Windows\Tasks\chrosha.job 3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
736	rundll32.exe
2564	rundll32.exe
908	rundll32.exe

description	ioc	process
File created	C:\Windows\Tasks\chrosha.job	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

Processes:

3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exechrosha.exerundll32.exepowershell.exe

pid	process
2696	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
2696	3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
4972	chrosha.exe
4972	chrosha.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
2564	rundll32.exe
684	powershell.exe
684	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 684 powershell.exe

description	pid	process
Token: SeDebugPrivilege	684	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

chrosha.exerundll32.exerundll32.exe

description	pid	process	target process
PID 4972 wrote to memory of 736	4972	chrosha.exe	rundll32.exe
PID 4972 wrote to memory of 736	4972	chrosha.exe	rundll32.exe
PID 4972 wrote to memory of 736	4972	chrosha.exe	rundll32.exe
PID 736 wrote to memory of 2564	736	rundll32.exe	rundll32.exe
PID 736 wrote to memory of 2564	736	rundll32.exe	rundll32.exe
PID 2564 wrote to memory of 4616	2564	rundll32.exe	netsh.exe
PID 2564 wrote to memory of 4616	2564	rundll32.exe	netsh.exe
PID 2564 wrote to memory of 684	2564	rundll32.exe	powershell.exe
PID 2564 wrote to memory of 684	2564	rundll32.exe	powershell.exe
PID 4972 wrote to memory of 908	4972	chrosha.exe	rundll32.exe
PID 4972 wrote to memory of 908	4972	chrosha.exe	rundll32.exe
PID 4972 wrote to memory of 908	4972	chrosha.exe	rundll32.exe

C:\Users\Admin\AppData\Local\Temp\3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.exe
"C:\Users\Admin\AppData\Local\Temp\3b954c38f95fa5ebd624818edc56cd29f4c4099d2c981aa5a54388f6ea06726a.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:2696

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:4972

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:736

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:2564

C:\Windows\system32\netsh.exe
netsh wlan show profiles
4⤵
PID:4616

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\017659663955_Desktop.zip' -CompressionLevel Optimal
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:684

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:908

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Virtualization/Sandbox Evasion

System Information Discovery