Managed XDR

c-windows-y59fyoom.exe (REvil, Sodinokibi) — malware analysis report

File info

Filename
c-windows-y59fyoom.exe
File type
PE32 executable (GUI) Intel 80386, for MS Windows
File size
157.5 KB
First seen
Last seen

Environment

w10/x86 en

Hashes

SHA1
f628a2035e49817889cc67a5d7648b56ec72c543
SHA256
1f26e577eafb91fc8180817586f29d5c4353b83ad62a886406039c477791049a
MD5
0119e98ee32614700270468576d34fe5

Malwares

  • REvil
  • Sodinokibi

Signatures

Privilege Escalation

T1068 integrity_level: Process privileges have been escalated
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 unnamed_memory_regions: Code was executed in unnamed regions
T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1027.002 packer_entropy: Probably contains compressed or encrypted data
T1027.002 pe_features: Executable file has PE anomalies (may be false positive)
T1070 stealth_window: A process created a hidden window
T1497 evasion_diskenum: Sandbox evasion using enumeration of partitions
T1497.001 antivm_queries_computername: Retrieves the computer name
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 infostealer_mail: Collects personal data from local email clients
T1552 infostealer_browser: Retrieves personal information from local Internet browsers
T1552.001 infostealer_bitcoin: Attempts to obtain access to Bitcoin/ALTCoin wallets
T1503 infostealer_browser: Retrieves personal information from local Internet browsers
T1555.003 cookie_files: Accesses cookie files
T1555.004 windows_credential_manager: Acquire credentials from the Windows Credential Manager
T1552 cookie_files: Accesses cookie files

Discovery

T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1057 process_interest: Enumerates processes
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
T1497.001 antivm_queries_computername: Retrieves the computer name

Collection

T1114 infostealer_mail: Collects personal data from local email clients
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 100 or more files)
T1486 ransomware_files: Ransomware indicators detected REvil (creates keys and the instruction on how to unlock the files)

Other

yara_rules: Static rules
ce_info: REvil note, REvil config Configuration Data found
revil: Ransomware REvil indicators detected
ransomware_shadowcopy: Removes volume shadow copies
ransomware_bcdedit: Runs bcdedit commands specific to ransomware
cryptolocker_wallpaper: Ransomware indicators detected (changes the desktop wallpaper file)
create_rpc_bindings: Creates RPC connection
creates_suspended_process: Creates suspended process
access_recyclebin: Manipulation with recyclebin detected
test_check_service: Starts services
writes_data: Writes big amount of data to disk

Related reports

Managed XDR