Managed XDR

sumatrapdf.exe (Lockbit) — malware analysis report

File info

Filename
sumatrapdf.exe
File type
PE32 executable (GUI) Intel 80386, for MS Windows
File size
560.8 KB
First seen
Last seen

Environment

win7/x86 en

Hashes

SHA1
b92c05fdc3c7f2de9fe3e52469a33bbab565a916
SHA256
05312d1c61a4c8ae14fa5a8649007a8e7e72d1e1c81e9d50bc955efac80a7ba9
MD5
0f7c57b8647f802f7e37d0701dfd4b63

Malwares

  • Lockbit

Signatures

Execution

T1059.003 cmd_ping_del: Uses cmd.exe for pausing and deletion of the original file
T1047 has_wmi: Executes one or several WMI requests

Persistence

T1547.001 persistence_autorun: Makes itself run automatically on Windows startup
T1542.003 bootkit_like_low_level_disk_access: Bootkit-like low level disk access

Privilege Escalation

T1547.001 persistence_autorun: Makes itself run automatically on Windows startup
T1134 sets_privilegies_via_rtladjustprivilege: Sets process privilege via RtlAdjustPrivilege
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

T1070.004 deletes_self: Moves to different location or removes the original executable file
T1070.004 cmd_ping_del: Uses cmd.exe for pausing and deletion of the original file
T1497 antidbg_setinformationthread: Attempts to evade debugger using NtSetInformationThread
T1497.001 antivm_generic_disk: Checks information on disk, possibly for anti-virtualization or checking privileges
T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_sleep_utilities: Uses Windows utilities for pausing the execution
T1027.002 pe_features: Executable file has PE anomalies (may be false positive)
T1134 sets_privilegies_via_rtladjustprivilege: Sets process privilege via RtlAdjustPrivilege
T1134 opens_thread_token: Opens the access token associated with a thread
T1134 opens_process_token: Opens the access token associated with a process
T1542.003 bootkit_like_low_level_disk_access: Bootkit-like low level disk access
T1497.001 antivm_queries_computername: Retrieves the computer name
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1027.002 packer_entropy: Probably contains compressed or encrypted data
T1070 stealth_window: A process created a hidden window
T1070.004 self_removal_command: Executes command to delete itself

Credential Access

T1552.001 infostealer_bitcoin: Attempts to obtain access to Bitcoin/ALTCoin wallets
T1555.003 cookie_files: Accesses cookie files
T1552 cookie_files: Accesses cookie files

Discovery

T1518.001 antidbg_devices: Checks for devices typical for debuggers and forensic tools
T1497 antidbg_setinformationthread: Attempts to evade debugger using NtSetInformationThread
T1497.001 antivm_generic_disk: Checks information on disk, possibly for anti-virtualization or checking privileges
T1082 antivm_generic_disk: Checks information on disk, possibly for anti-virtualization or checking privileges
T1057 process_interest: Enumerates processes
T1083 crawls_directories: Opens a huge number of directories all over disk C: (possibly, searches for sensitive data)
T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_sleep_utilities: Uses Windows utilities for pausing the execution
T1518 locates_browser: Attempts to identify where browsers are installed
T1016.001 system_network_configuration_discovery: System network configuration discovery detected
T1497.001 antivm_queries_computername: Retrieves the computer name
T1497.003 antisandbox_sleep: The process attempted to slow down analysis

Impact

T1486 modifies_files2: Cryptolocker indicators detected (500 or more files are modified)
T1486 modifies_files: Cryptolocker indicators detected (renamed 500 or more files)
T1486 ransomware_extensions: Ransomware(s) Lockbit indicators detected (specific extension is added to files)
T1490 vssadmin_delete_shadows: Attempt to delete volume shadow copies
T1486 ransomware_message: Ransomware indicators detected (possible ransom message creation)
T1486 ransomware_files: Ransomware indicators detected Lockbit (creates keys and the instruction on how to unlock the files)
T1490 wbadmin_delete_backup: Removes system backup copies using wbadmin utility

Other

yara_rules: Static rules
ce_info: Lockbit Configuration Data found
lockbit: Detected ransomware Lockbit
ransomware_shadowcopy: Removes volume shadow copies
static_pe_anomaly: The PE file structure contains anomalies
ransomware_bcdedit: Runs bcdedit commands specific to ransomware
cryptolocker_wallpaper: Ransomware indicators detected (changes the desktop wallpaper file)
create_process_failed: Could not start the process
network_anomaly: Network anomalies occured during the analysis
unexpected_exception: Unexpected exception
static_pe_duplicate_sections: The PE file structure contains anomalies: duplicate section names
create_rpc_bindings: Creates RPC connection
interface_enum_connections: IEnumConnections interface quering is detected
creates_suspended_process: Creates suspended process
break_limit_exceeded: Warning: function calls limit has been exceeded
access_recyclebin: Manipulation with recyclebin detected
protector_asprotect: Executable file is protected with ASProtect
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
pe_overlay: PE file contains overlay

Related reports

Managed XDR