Malicious RTF — malware analysis report

Static analysis result for SHA-256 c374f7f30b34d95d…

MALICIOUS

RTF

674.0 KB Created: 2018-08-19 18:12:00 Authoring application: Micro soft Word 11.0.5604 First seen: 2020-02-04
MD5: 0a79949e454be32e6ab96808657969c6 SHA-1: 59986c917e77e09de57202ad05acc3549772470d SHA-256: c374f7f30b34d95dd99d9cf16f54192d439f830918d342558945e5809809b847
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and specifically triggers heuristics related to Equation Editor vulnerabilities, including CVE-2017-11882 and CVE-2018-0802. This indicates the file is designed to exploit these vulnerabilities for client-side code execution, likely delivered as a spearphishing attachment.

Heuristics 8

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000cdb.bin rtf-objdata-decoded RTF \objdata at offset 0xCDB 333552 bytes
SHA-256: 4c8f70d3a61d1029b191b10cebd94d87445d3ca21e772580fea38d0c160b40b7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
objdata_01_off000a3af1.bin rtf-objdata-decoded RTF \objdata at offset 0xA3AF1 9796 bytes
SHA-256: 569590d9e7132afd29d3f66f48b37b57334d953b935c1b4e82f8ebd000906072
objdata_02_off000a3b03.bin rtf-objdata-decoded RTF \objdata at offset 0xA3B03 35 bytes
SHA-256: 1188b98b21f50564ab8b476f25b6deab999a2f58a56c4dd0daa0f5883cfa941d

Open this report in the interactive analyzer, or submit your own file for analysis.