Managed XDR

c-users-user-desktop-rynngtokplan.exe (Ryuk) — malware analysis report

File info

Filename
c-users-user-desktop-rynngtokplan.exe
File type
PE32 executable (GUI) Intel 80386, for MS Windows
File size
116.4 KB
First seen
Last seen

Environment

win7/x86 en

Hashes

SHA1
ad633033ce4f1e7892ce032dfdfe467a2b843c11
SHA256
212a0a2239c13591cfcc5c5072d40d2b9e60c009928db89f6e14633744d58ca4
MD5
49911679f6700d4ffb6cef55e3744a72

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

T1564.001 stealth_file: Creates hidden or system files
T1497.001 antivm_generic_services: Enumerates services, possibly for anti-virtualization
T1222 icacls: May obtain or change Discretionary access control lists (DACLs)
T1497 antidbg_query_process: Checks if the process is being debugged (ProcessDebugPort)
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1497.001 antivm_network_adapters: Checks NIC addresses
T1134 opens_thread_token: Opens the access token associated with a thread
T1134 opens_process_token: Opens the access token associated with a process
T1027.001 static_overlay_padding: Overlay contents padding
T1027.002 packer_entropy: Probably contains compressed or encrypted data
T1070 stealth_window: A process created a hidden window

Discovery

T1497.001 antivm_generic_services: Enumerates services, possibly for anti-virtualization
T1057 process_interest: Enumerates processes
T1497 antidbg_query_process: Checks if the process is being debugged (ProcessDebugPort)
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1497.001 antivm_network_adapters: Checks NIC addresses

Collection

T1074.001 access_recyclebin: Manipulation with recyclebin detected

Command and Control

T1095 network_icmp: Creates ICMP traffic

Exfiltration

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

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_extensions: Ransomware(s) Ryuk indicators detected (specific extension is added to 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 behaviour)
T1489 net_stop: Stops services through the use of net stop

Other

yara_rules: Static rules
ryuk: Detected Ryuk ransomware
copies_self: Creates a copy of itself
creates_exe: Creates executable files in the file system
executes_dropped_exe: Executes dropped exe files
no_graphical_activity: No graphic activity
get_policy_info: Retrieves information about a Policy object
writes_data: Writes big amount of data to disk
pe_overlay: PE file contains overlay

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