Managed XDR

vtdl_1741395120_xk828yc1 (AvosLocker, Avos) — malware analysis report

File info

Filename
vtdl_1741395120_xk828yc1
File type
PE32+ executable (GUI) x86-64, for MS Windows
File size
56 MB
First seen
Last seen

Environment

w10/x64 en

Hashes

SHA1
0dac7e77257f51ee11e04803874d764e8fa8ae3a
SHA256
33e648333f7d85219d6b82e64c44f9ee849e99da8691deddcb34ee694c73c538
MD5
bf362ca5f9b4dfa01b0ca45937f0f8d2

Malwares

  • AvosLocker
  • Avos

Signatures

Execution

T1047 has_wmi: Executes one or several WMI requests
T1059.001 suspicious_process: Spawns a suspicious process
T1059.006 drops_python_dll: Drops python dll

Persistence

T1574 dropper_dll: Creates DLL, which is then loaded into the process

Privilege Escalation

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

T1027.002 packer_entropy: Probably contains compressed or encrypted data
T1574 dropper_dll: Creates DLL, which is then loaded into the process
T1497 evasion_diskenum: Sandbox evasion using enumeration of partitions
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

Credential Access

T1552.001 infostealer_bitcoin: Attempts to obtain access to Bitcoin/ALTCoin wallets

Discovery

T1083 crawls_directories: Opens a huge number of directories all over disk C: (possibly, searches for sensitive data)
T1518 locates_browser: Attempts to identify where browsers are installed
T1497 evasion_diskenum: Sandbox evasion using enumeration of partitions

Collection

T1113 screenshot_file: Possibly, makes a screenshot and saves it to a file

Impact

T1486 modifies_files2: Cryptolocker indicators detected (500 or more files are modified)
T1486 modifies_files: Cryptolocker indicators detected (renamed 500 or more files)
T1490 vssadmin_delete_shadows: Attempt to delete volume shadow copies
T1486 ransomware_message: Ransomware indicators detected (possible ransom message creation)
T1486 ransomware_extensions: Ransomware(s) AvosLocker indicators detected (specific extension is added to files)
T1486 ransomware_files_2: Ransomware(s) AvosLocker indicators detected (creates keys and the instruction on how to unlock the files)
T1486 mass_data_encryption: Encrypts data using the same key (possible ransomware behaviour)

Other

yara_rules: Static rules
ransomware_avos: Detected Avos ransomware
ransomware_shadowcopy: Removes volume shadow copies
ransomware_bcdedit: Runs bcdedit commands specific to ransomware
cryptolocker_wallpaper: Ransomware indicators detected (changes the desktop wallpaper file)
creates_exe: Creates executable files in the file system
executes_dropped_exe: Executes dropped exe files
creates_suspended_process: Creates suspended process
test_check_service: Starts services
writes_data: Writes big amount of data to disk
pe_overlay: PE file contains overlay
static_big_overlay: Executable file contains an enormously big overlay

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