Managed XDR

wextract.exe-.mui (NanoCore, Amadey, XWorm, Symmi) — malware analysis report

File info

Filename
wextract.exe-.mui
File type
PE32 executable (GUI) Intel 80386, for MS Windows
File size
4 MB
First seen
Last seen

Environment

win7/x86 en

Hashes

SHA1
d6d0040605a60d9aaa0b4e33223bb8f9847d17ae
SHA256
220eae511aca06182e60a72b1c9a4afb393faf9700526a07d1c55ad829abdf11
MD5
6fd953f2718e88a6554cfd833a756032

Malwares

  • NanoCore
  • Amadey
  • XWorm
  • Symmi

Signatures

Execution

T1059 suspicious_cmd_arguments: Cmd.exe uses file as a data source for the standard input stream
T1059 autoit: AutoIt script execution detected
T1059.001 suspicious_powershell: Creates suspicious powershell process
T1059.003 suspicious_cmd_process: Cmd.exe without commandline launches a new process
T1569.002 persistence_service: Starts newly created service
T1059.001 suspicious_process: Spawns a suspicious process
T1059.003 executes_dropped_cmd: Executes dropped batch files
T1047 antivm_wmi: Uses WMI to detect virtual environment
T1047 has_wmi: Executes one or several WMI requests
T1059.003 suspicious_batch: Suspicious batch
T1106 susp_callbacks: Suspicious usage of some WinAPI with callbacks

Persistence

T1547.001 persistence_autorun: Makes itself run automatically on Windows startup
T1543.003 creates_service: Creates a service, that will start automatically
T1574 dropper_dll: Creates DLL, which is then loaded into the process

Privilege Escalation

T1547.001 persistence_autorun: Makes itself run automatically on Windows startup
T1134.004 ppid_spoofing: Parent pid spoofing detected
T1055.012 injection_runpe: Injects code into another process
T1543.003 creates_service: Creates a service, that will start automatically
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

T1134.004 ppid_spoofing: Parent pid spoofing detected
T1055.012 injection_runpe: Injects code into another process
T1027.002 unnamed_memory_regions: Code was executed in unnamed regions
T1027.002 unnamed_memory_regions_contains_pe: One or several unnamed memory regions are PE files
T1027.002 packer_themida: Themida packer signatures detected
T1564.001 stealth_file: Creates hidden or system files
T1070 stealth_webhistory: Clears browsing history
T1497 antidbg_windows: Checks for open windows typical for debuggers and forensic tools
T1497 antidbg_setinformationthread: Attempts to evade debugger using NtSetInformationThread
T1497.001 antivm_generic_services: Enumerates services, possibly for anti-virtualization
T1497.001 antivm_vbox_devices: Detects VirtualBox through the presence of a device
T1497.001 antivm_vbox_window: Detects VirtualBox through the presence of a window
T1497.001 antivm_vbox_provname: Detects VirtualBox using WNetGetProviderName
T1497.001 antivm_firmware: Attempts to detect VM by firmware
T1497.001 antivm_vbox_acpi: Detects virtualization using ACPI
T1497.001 antivm_generic_disk_setupapi: Collects information about disks using Device Information APIs for anti-virtualizition
T1497.001 antivm_vbox_keys: Detects VirtualBox through the presence of a registry key
T1497.001 antivm_vbox_files: Detects VirtualBox through the presence of a file
T1497.001 antivm_generic_ide: Checks the presence of IDE drives in the registry, possibly for anti-virtualization
T1497.001 antivm_generic_scsi: Attempts to detect virtualization by SCSI Disk Identifier
T1036 system_filename: Created a file named as a common system file
T1027.002 packer_enigma: Enigma protector indicators detected
T1222 icacls: May obtain or change Discretionary access control lists (DACLs)
T1497.001 antivm_wmi: Uses WMI to detect virtual environment
T1497.001 antivm_directory_objects: Scans directory objects, possibly to find VM indicators
T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_idletime: Detects Windows Idle Time to determine the uptime
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
T1070 stealth_window: A process created a hidden window
T1497 checks_firmware: Attempts to read firmware information (potentially for evasion)
T1497.001 antivm_generic_video: Checks information about video adapters in registry, possibly for anti-virtualization
T1497.001 antivm_queries_computername: Retrieves the computer name
T1497.003 antisandbox_sleep: The process attempted to slow down analysis

Credential Access

T1555.003 cookie_files: Accesses cookie files
T1552 cookie_files: Accesses cookie files
T1056.001 infostealer_keylogger: Keylogger (intercepts keystrokes)

Discovery

T1518.001 antiav_detectfile: Attempts to detect installed antiviruses by a certain directory
T1497 antidbg_windows: Checks for open windows typical for debuggers and forensic tools
T1497 antidbg_setinformationthread: Attempts to evade debugger using NtSetInformationThread
T1497.001 antivm_generic_services: Enumerates services, possibly for anti-virtualization
T1497.001 antivm_vbox_devices: Detects VirtualBox through the presence of a device
T1497.001 antivm_vbox_window: Detects VirtualBox through the presence of a window
T1497.001 antivm_vbox_provname: Detects VirtualBox using WNetGetProviderName
T1497.001 antivm_firmware: Attempts to detect VM by firmware
T1497.001 antivm_vbox_acpi: Detects virtualization using ACPI
T1497.001 antivm_generic_disk_setupapi: Collects information about disks using Device Information APIs for anti-virtualizition
T1497.001 antivm_vbox_keys: Detects VirtualBox through the presence of a registry key
T1497.001 antivm_vbox_files: Detects VirtualBox through the presence of a file
T1497.001 antivm_generic_ide: Checks the presence of IDE drives in the registry, possibly for anti-virtualization
T1497.001 antivm_generic_scsi: Attempts to detect virtualization by SCSI Disk Identifier
T1057 process_interest: Enumerates processes
T1497.001 antivm_wmi: Uses WMI to detect virtual environment
T1497.001 antivm_directory_objects: Scans directory objects, possibly to find VM indicators
T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_idletime: Detects Windows Idle Time to determine the uptime
T1082 has_wmi: Executes one or several WMI requests
T1082 uses_windows_utilities: Uses Windows utilities for basic Windows functionality
T1518 locates_browser: Attempts to identify where browsers are installed
T1135 server_share_info: Retrieves information about each shared resource on a server
T1497 checks_firmware: Attempts to read firmware information (potentially for evasion)
T1497.001 antivm_generic_video: Checks information about video adapters in registry, possibly for anti-virtualization
T1497.001 antivm_queries_computername: Retrieves the computer name
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1082 reads_csrss: Attempts to read csrss.exe memory
T1082 checks_firmware: Attempts to read firmware information (potentially for evasion)

Collection

T1115 checks_clipboard: Monitors clipboard data
T1056.001 infostealer_keylogger: Keylogger (intercepts keystrokes)

Command and Control

T1568.002 dga_domains: Connects to DGA domains
T1071.001 network_cnc_http: Suspicious HTTP traffic
T1105 lolbin_extrac32: Download or Copy file with Extrac32
T1071.001 network_http: Performs HTTP requests
T1071.001 winhttp_https: Performs HTTP/HTTPS requests using WinHttp
T1071.001 wininet_openurl: Performs HTTP/HTTPS-requests using InternetOpenUrl
T1071.001 wininet_https: Performs HTTP/HTTPS requests using WinInet

Exfiltration

T1022 encrypts_pc_info: Collects and encrypts information about the computer (possibly for exfiltration)

Other

yara_rules: Static rules
suricata_alert: Malicious traffic detected
executes_dropped_exe: Executes dropped exe files
creates_many_processes: Spawns a lot of processes (over 70)
dll_mapping_exception: Failed mapping of dll with exception
rat_nanocore: Nanocore RAT behavioural patterns detected
creates_exe: Creates executable files in the file system
creates_in_windows: Creates files in the Windows directory
runs_utility_without_cmdline: Runs system utility without arguments (non-typical usage)
create_process_failed: Could not start the process
dns_without_resolve: DNS query without a response
creates_doc: Creates (office) documents in the file system
codepage: Checks the system code page
process_crashed: One of the processes has failed
unexpected_exception: Unexpected exception
create_rpc_bindings: Creates RPC connection
has_pdb: This executable file has a PDB path
creates_suspended_process: Creates suspended process
break_limit_exceeded: Warning: function calls limit has been exceeded
get_policy_info: Retrieves information about a Policy object
creates_in_programdata: Creates files in the ProgramData directory
test_check_service: Starts services
checktokenmembership: Checks user token with CheckTokenMembership call
writes_data: Writes big amount of data to disk

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