Managed XDR

as.docx (Remcos) — malware analysis report

File info

Filename
as.docx
File type
Microsoft Word 2007+
File size
589.1 KB
First seen
Last seen

Environment

win7/x64 en

Hashes

SHA1
347a941f9118791a8d8e198dc97b2e2a50f993ea
SHA256
6f301f608275adea39d15ff531af4300d1260a6b0257ff9991a5ee69928dacf7
MD5
8fba0c59283302deeda5fb657ca06df4

Malwares

  • Remcos

Signatures

Execution

T1203 exploit_CVE_2017_11882: Exploits CVE-2017-11882 vulnerability
T1203 office_write_exe: Office document dropped an executable file
T1059.003 suspicious_process: Spawns a suspicious process

Persistence

T1574 dropper_dll: Creates DLL, which is then loaded into the process

Privilege Escalation

T1134.004 ppid_spoofing: Parent pid spoofing detected
T1574 dropper_dll: Creates DLL, which is then loaded into the process
T1134 sets_privilegies_via_adjusttokenprivileges: Sets process privilege via AdjustTokenPrivileges
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

T1134.004 ppid_spoofing: Parent pid spoofing detected
T1562 dep_disable: Disables DEP
T1564.001 stealth_file: Creates hidden or system files
T1497 antidbg_query_process: Checks if the process is being debugged (ProcessDebugPort)
T1497.002 antisandbox_foregroundwindows: Checks whether any human activity is being performed by constantly checking whether the foreground window has changed
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1027.002 packer_entropy: Probably contains compressed or encrypted data
T1134 sets_privilegies_via_adjusttokenprivileges: Sets process privilege via AdjustTokenPrivileges
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 evasion_trustrecords: Attempts to detect Sandbox exploring trusted documents
T1497 checks_firmware: Attempts to read firmware information (potentially for evasion)
T1497.001 antivm_queries_computername: Retrieves the computer name
T1574 dropper_dll: Creates DLL, which is then loaded into the process

Credential Access

T1056.001 infostealer_keylogger: Keylogger (intercepts keystrokes)
T1552 cookie_files: Accesses cookie files
T1555.003 cookie_files: Accesses cookie files

Discovery

T1057 process_interest: Enumerates processes
T1497 antidbg_query_process: Checks if the process is being debugged (ProcessDebugPort)
T1497.002 antisandbox_foregroundwindows: Checks whether any human activity is being performed by constantly checking whether the foreground window has changed
T1497.003 antisandbox_sleep: The process attempted to slow down analysis
T1082 checks_firmware: Attempts to read firmware information (potentially for evasion)
T1135 server_share_info: Retrieves information about each shared resource on a server
T1497 evasion_trustrecords: Attempts to detect Sandbox exploring trusted documents
T1497 checks_firmware: Attempts to read firmware information (potentially for evasion)
T1497.001 antivm_queries_computername: Retrieves the computer name
T1083 checks_recent_files: Attempt to check recently opened files through registry

Collection

T1056.001 infostealer_keylogger: Keylogger (intercepts keystrokes)
T1115 checks_clipboard: Monitors clipboard data

Command and Control

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

Other

yara_rules: Static rules
networkdyndns_checkip: Connects to a Dynamic DNS domain
office_embedded: Office document contains embedded executable file(s)
dll_mapping_exception: Failed mapping of dll with exception
modifies_certs: Attempts to generate or modify system certificates
copies_self: Creates a copy of itself
creates_exe: Creates executable files in the file system
process_crashed: One of the processes has failed
unexpected_exception: Unexpected exception
valid_authenticode: The digital signature has been verified
create_rpc_bindings: Creates RPC connection
has_pdb: This executable file has a PDB path
get_policy_info: Retrieves information about a Policy object
creates_in_programdata: Creates files in the ProgramData directory
test_check_service: Starts services
antisandbox_check_graphics_card: Uses CreateDXGIFactory, potentially to detect graphics card
pe_overlay: PE file contains overlay

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