Managed XDR

rdpurxwk.exe (Tofsee) — malware analysis report

File info

Filename
rdpurxwk.exe
File type
PE32 executable (GUI) Intel 80386, for MS Windows
File size
13.7 MB
First seen
Last seen

Environment

win7/x86 en

Hashes

SHA1
72e04f1ecfa6ed1a9a066a847e250945ef42f5c8
SHA256
ad3438cfadd1a00fd079a5224521494ce02cf2daeeed40e8b658258e0b464ae4
MD5
1b01c860b8f473f7e363db47f6ab5686

Malwares

  • Tofsee

Signatures

Resource Development

T1586.001 social_vkontakte: Connects to Vkontakte domains (potentially for information gathering)
T1585.001 social_vkontakte: Connects to Vkontakte domains (potentially for information gathering)
T1586.001 social_telegram: Connects to Telegram (potentially for information gathering)
T1585.001 social_telegram: Connects to Telegram (potentially for information gathering)

Execution

T1569.002 persistence_service: Starts newly created service

Persistence

T1543.003 creates_service: Creates a service, that will start automatically

Privilege Escalation

T1055.002 inject_write_pe: Writes PE file to another process's memory
T1543.003 creates_service: Creates a service, that will start automatically
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_contains_pe: One or several unnamed memory regions are PE files
T1070.004 deletes_self: Moves to different location or removes the original executable file
T1055.002 inject_write_pe: Writes PE file to another process's memory
T1027.002 unnamed_memory_regions: Code was executed in unnamed regions
T1562.001 disables_security: Disables Windows Security options
T1562.004 firewall_add_rule: Modifies Firewall rules
T1096 persistence_ads: Creates Alternate Data Stream (ADS)
T1112 creates_largekey: Saves very large data in the registry, can be used to save the configuration or body of the malware
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
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
T1497.001 antivm_queries_computername: Retrieves the computer name
T1070 stealth_window: A process created a hidden window

Discovery

T1082 uses_windows_utilities: Uses Windows utilities for basic Windows functionality
T1497.001 antivm_disk_size: Checks the amount of free disk space
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1497.001 antivm_network_adapters: Checks NIC addresses
T1497.001 antivm_queries_computername: Retrieves the computer name

Command and Control

T1102.003 cloud_mediafire: Connects to cloud services of Mediafire (potentially to download malicious code)
T1071.001 network_cnc_http: Suspicious HTTP traffic
T1071.001 network_http: Performs HTTP requests
T1102.003 cloud_amazonaws: Connects to cloud services of Amazon AWS (potentially for malicious payload delivery)

Other

yara_rules: Static rules
suricata_alert: Malicious traffic detected
creates_in_windows: Creates files in the Windows directory
ip_domains: Identifies an IP address using external resources
network_bind: Starts servers listening at 0.0.0.0:5844
creates_exe: Creates executable files in the file system
dns_without_resolve: DNS query without a response
suspicious_process: Spawns a suspicious process
network_ftp: Performs FTP requests
no_graphical_activity: No graphic activity
create_rpc_bindings: Creates RPC connection
has_pdb: This executable file has a PDB path
creates_suspended_process: Creates suspended process
origin_langid: Unconventional language of the executable file
get_policy_info: Retrieves information about a Policy object
test_check_service: Starts services
checktokenmembership: Checks user token with CheckTokenMembership call

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