Managed XDR

office.zip (Cobalt Strike) — malware analysis report

File info

Filename
office.zip
File type
Zip archive data, at least v2.0 to extract
File size
342.6 KB
First seen
Last seen

Environment

win7/x86 en

Hashes

SHA1
5a32fdbc85793c98e48652db99939908e88e68fa
SHA256
4177a5142a9726f14817d8f9107f88e8a07e6be306790377e862acf1894bb47c
MD5
b5602200ae599623ef9ad9ed449f2bf4

Malwares

  • Cobalt Strike

Signatures

Execution

T1047 has_wmi: Executes one or several WMI requests
T1059.003 suspicious_batch: Suspicious batch

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

T1027.002 unnamed_memory_regions_contains_pe: One or several unnamed memory regions are PE files
T1027.002 unnamed_memory_regions: Code was executed in unnamed regions
T1027.002 packer_entropy: Probably contains compressed or encrypted data
T1497.003 antisandbox_sleep_utilities: Uses Windows utilities for pausing the execution
T1134 opens_thread_token: Opens the access token associated with a thread
T1134 opens_process_token: Opens the access token associated with a process
T1480 system_default_lang_id_present: Checks the system language
T1497.001 antivm_queries_computername: Retrieves the computer name
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1070.004 self_removal_command: Executes command to delete itself

Credential Access

T1555.003 cookie_files: Accesses cookie files
T1552 cookie_files: Accesses cookie files

Discovery

T1518.001 antiav_detectfile: Attempts to detect installed antiviruses by a certain directory
T1018 discovery_remote_system: Collects information about remote systems
T1497.003 antisandbox_sleep_utilities: Uses Windows utilities for pausing the execution
T1082 uses_windows_utilities: Uses Windows utilities for basic Windows functionality
T1497.001 antivm_queries_computername: Retrieves the computer name
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1016.001 system_network_configuration_discovery: System network configuration discovery detected
T1082 reads_csrss: Attempts to read csrss.exe memory

Command and Control

T1071.001 wininet_https: Performs HTTP/HTTPS requests using WinInet

Impact

T1490 vssadmin_delete_shadows: Attempt to delete volume shadow copies
T1489 net_stop: Stops services through the use of net stop

Other

yara_rules: Static rules
ce_info: CobaltStrike Configuration Data found
cobaltstrike_beacon: Memory region specific for CobaltStrike beacon was found
cobaltstrike_loader: CobaltStrike loader is detected
creates_many_processes: Spawns a lot of processes (over 70)
ransomware_shadowcopy: Removes volume shadow copies
ransomware_bcdedit: Runs bcdedit commands specific to ransomware
dns_without_resolve: DNS query without a response
dead_host: Connects to IP addresses that do not respond to requests
process_crashed: One of the processes has failed
unexpected_exception: Unexpected exception
create_rpc_bindings: Creates RPC connection
break_limit_exceeded: Warning: function calls limit has been exceeded
test_check_service: Starts services
checktokenmembership: Checks user token with CheckTokenMembership call

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