Managed XDR

vtdl_1778814329_rzajex8n (ValleyRAT) — malware analysis report

File info

Filename
vtdl_1778814329_rzajex8n
File type
Zip archive data, at least v2.0 to extract
File size
633.1 KB
First seen
Last seen

Environment

w10/x64 en

Hashes

SHA1
ab6c9bea0ed3d8a9b2e0b43bc6f32d61558c8120
SHA256
a009eadbaf24be264d6244235b678ac1157434fac5d08037519d2b960faff3c9
MD5
88e4c14d750157fdb9a99737563f0faa

Malwares

  • ValleyRAT

Signatures

Execution

T1569.002 persistence_service: Starts newly created service
T1047 antivm_wmi: Uses WMI to detect virtual environment
T1047 has_wmi: Executes one or several WMI requests

Persistence

T1543.003 creates_service: Creates a service, that will start automatically
T1543.003 add_service_to_group: Adds created service to a group
T1574 dropper_dll: Creates DLL, which is then loaded into the process

Privilege Escalation

T1055 injection_thread: Code injection to a remote process using CreateRemoteThread or NtQueueApcThread
T1543.003 creates_service: Creates a service, that will start automatically
T1543.003 add_service_to_group: Adds created service to a group
T1574 dropper_dll: Creates DLL, which is then loaded into the process
T1134 sets_privilegies_via_adjusttokenprivileges: Sets process privilege via AdjustTokenPrivileges
T1134 opens_thread_token: Opens the access token associated with a thread
T1134 opens_process_token: Opens the access token associated with a process

Defense Evasion

T1055 injection_thread: Code injection to a remote process using CreateRemoteThread or NtQueueApcThread
T1027.002 unnamed_memory_regions: Code was executed in unnamed regions
T1562.001 disables_security: Disables Windows Security options
T1562 modify_security_center_warnings: Attempts to modify or disable Security Center notifications
T1562 modify_uac_prompt: Attempts to modify UAC pop-up window behavior
T1562 disables_uac: Disable UAC
T1562 antiav_srp: Modifies Software Restriction Policies, probably to disrupt AV operation
T1562.001 disables_windowsupdate: Disables Windows Auto Updates
T1036.001 invalid_authenticode: Digital signature of the executable file has failed the verification
T1574 dropper_dll: Creates DLL, which is then loaded into the process
T1497.001 antivm_wmi: Uses WMI to detect virtual environment
T1036 system_filename: Created a file named as a common system file
T1027.002 pe_features: Executable file has PE anomalies (may be false positive)
T1089 disables_smartscreen: Modifies or disables Windows SmartScreen
T1134 sets_privilegies_via_adjusttokenprivileges: Sets process privilege via AdjustTokenPrivileges
T1134 opens_thread_token: Opens the access token associated with a thread
T1134 opens_process_token: Opens the access token associated with a process
T1497 evasion_printers: Attempts to detect Sandbox by exploring existing printers
T1497.001 antivm_generic_productname: Checks system product name in registry, possibly for anti-virtualization
T1480 system_default_lang_id_present: Checks the system language

Credential Access

T1555.004 windows_credential_manager: Acquire credentials from the Windows Credential Manager

Discovery

T1057 has_wmi: Executes one or several WMI requests
T1057 process_interest: Enumerates processes
T1497.001 antivm_wmi: Uses WMI to detect virtual environment
T1082 has_wmi: Executes one or several WMI requests
T1082 uses_windows_utilities: Uses Windows utilities for basic Windows functionality
T1497 evasion_printers: Attempts to detect Sandbox by exploring existing printers
T1497.001 antivm_generic_productname: Checks system product name in registry, possibly for anti-virtualization

Command and Control

T1071.001 winhttp_https: Performs HTTP/HTTPS requests using WinHttp

Impact

T1565 modifies_hostfile: Writes data to system hosts file
T1489 stops_service: Stops Windows services
T1490 disables_system_restore: Disables System Restore
T1489 change_service_config: Stops services via ChangeServiceConfig
T1489 service_control_stop: Stops services via ControlService

Other

yara_rules: Static rules
ce_info: ValleyRAT Configuration Data found
network_bind: Starts servers listening at None
creates_exe: Creates executable files in the file system
dead_host: Connects to IP addresses that do not respond to requests
only_exec_in_archive: The archive contains only an executable file
unsigned_driver_drop: Sample is not signed and drops a device driver
driver_load: Loads a driver
create_rpc_bindings: Creates RPC connection
creates_suspended_process: Creates suspended process
break_limit_exceeded: Warning: function calls limit has been exceeded
creates_in_programdata: Creates files in the ProgramData directory
suspicious_network_port: Performs TCP or UDP request to non-standard port
test_check_service: Starts services
pe_overlay: PE file contains overlay
open_winlogon_process: Trying to open winlogon process
encoded_c2_in_pe: Possibly an encoded URL or IP address in PE file

Related reports

Managed XDR