Managed XDR

vtdl_bios_sz0 (Cobalt Strike) — malware analysis report

File info

Filename
vtdl_bios_sz0
File type
MS Windows shortcut, Item id list present, Has Relative path, Has command line arguments, Icon number=0, ctime=Mon Jan 1 00:00:00 1601, mtime=Mon Jan 1 00:00:00 1601, atime=Mon Jan 1 00:00:00 1601, length=0, window=hidenormalshowminimized
File size
1.3 KB
First seen
Last seen

Environment

w10/x86 en

Hashes

SHA1
42794bc15bcf73060231bd056cf88678f829154b
SHA256
0fb9d473f1209496cf596c26159ad5472aa82fcf08165a6f6f6249bec3d5339e
MD5
789d3d212c5bf61652dad2df146d0003

Malwares

  • Cobalt Strike

Signatures

Execution

T1059.001 suspicious_powershell: Creates suspicious powershell process
T1059.001 suspicious_process: Spawns a suspicious process
T1059.003 executes_dropped_cmd: Executes dropped batch files
T1059.001 url_cmdline: Cmdline of process contains URL
T1059.003 url_cmdline: Cmdline of process contains URL

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

T1218 suspicious_cmdline: Executes a suspicious command
T1027.002 unnamed_memory_regions: Code was executed in unnamed regions
T1497.003 antisandbox_idletime: Detects Windows Idle Time to determine the uptime
T1216 suspicious_syncappvpublishingserver: Creates suspicious SyncAppvPublishingServer process
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 antisandbox_script_timer: Detected script timer window (indicative of sleep style evasion)
T1497.001 antivm_generic_video: Checks information about video adapters in registry, possibly for anti-virtualization
T1070 stealth_window: A process created a hidden window

Discovery

T1083 crawls_directories: Opens a huge number of directories all over disk C: (possibly, searches for sensitive data)
T1497.003 antisandbox_idletime: Detects Windows Idle Time to determine the uptime
T1518 locates_browser: Attempts to identify where browsers are installed
T1497.001 antisandbox_script_timer: Detected script timer window (indicative of sleep style evasion)
T1497.001 antivm_generic_video: Checks information about video adapters in registry, possibly for anti-virtualization
T1016 get_hostname: Attempts to get hostname

Command and Control

T1071 internet_security_options: Sets Internet connections options that are not secure
T1032 internet_security_options: Sets Internet connections options that are not secure
T1071.001 network_http: Performs HTTP requests
T1071.001 winhttp_https: Performs HTTP/HTTPS requests using WinHttp
T1071.001 wininet_https: Performs HTTP/HTTPS requests using WinInet

Other

yara_rules: Static rules
cobaltstrike_loader: CobaltStrike loader is detected
creates_exe: Creates executable files in the file system
runs_utility_without_cmdline: Runs system utility without arguments (non-typical usage)
multiple_useragents: Uses more than one unique User-Agent
opens_document: Opens office documents
suspicious_process_network: Unusual process network activity detected
creates_doc: Creates (office) documents in the file system
network_powershell: Powershell process network connection detected
creates_suspended_process: Creates suspended process
test_check_service: Starts services

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