RTF / .DOC malware analysis — malicious · 6f6fc9b2580b0f61

MALICIOUS

RTF / .DOC

460.2 KB

MD5: 2174eb857f82eabe17feda47fcd88775 SHA-1: 9fa8796f0c93364ec07d0e2b04b63ea624a1f409 SHA-256: 6f6fc9b2580b0f61ab67d74a6e65b7993d7eb8e0719e650593c3edeebe7ea304

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object. Static analysis identified critical heuristics related to the Equation Editor vulnerability (CVE-2017-11882), indicating that the file attempts to exploit this flaw. The embedded object, when decoded, appears to be a PE file, suggesting it's a payload dropper. The document body is heavily obfuscated and unreadable, providing no direct clues about the payload's intent.

Heuristics 6

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000011cb.bin` `d6fae6c6c5b57bae47d3462e6fbc3945e7fedd5888b75bf67ec0ae61583b79bc`	rtf-objdata-decoded	RTF \objdata at offset 0x11CB	233256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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