Managed XDR

c-samples-d7333223dcc1...e609d67ac6d9af338efbe8 (Ryuk) — malware analysis report

File info

Filename
c-samples-d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8
File type
PE32 executable (GUI) Intel 80386, for MS Windows
File size
120.5 KB
First seen
Last seen

Environment

w10/x64 en

Hashes

SHA1
5ac1c7baacbdb59c55263f0d685f54ec0a688c1b
SHA256
d7333223dcc1002aae04e25e31d8c297efa791a2c1e609d67ac6d9af338efbe8
MD5
097cb948a1f011f5de11579849a08db5

Malwares

  • Ryuk

Signatures

Privilege Escalation

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

T1222 icacls: May obtain or change Discretionary access control lists (DACLs)
T1497 antidbg_query_process: Checks if the process is being debugged (ProcessDebugPort)
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
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

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

Discovery

T1497 antidbg_query_process: Checks if the process is being debugged (ProcessDebugPort)
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

Collection

T1074.001 access_recyclebin: Manipulation with recyclebin detected

Command and Control

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

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_files: Ransomware indicators detected Ryuk (creates keys and the instruction on how to unlock the files)
T1486 ransomware_files_2: Ransomware(s) Ryuk 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 behavior)

Other

ryuk: Detected Ryuk ransomware
yara_rules: Static rules
network_bind: Starts servers listening at None
creates_suspended_process: Creates suspended process
suspicious_network_port: Performs TCP or UDP request to non-standard port
test_check_service: Starts services
writes_data: Writes big amount of data to disk

Related reports

Managed XDR