RTF / .DOC malware analysis — malicious · 9bb844d15447e8db

MALICIOUS

RTF / .DOC

548.8 KB

MD5: a6c971210962c6b51179f10c2fcd8062 SHA-1: b2d06621511bb26bab01ebae9cb5a7dd8f66b956 SHA-256: 9bb844d15447e8db758c0fe92e42da742d5609cc60ea80f623ee6a9d5655893a

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains a malformed Equation Editor object, a known vulnerability (CVE-2017-11882), which is used to embed and execute a Portable Executable (PE) file. The ".objupdate" directive further suggests that the OLE object is intended to be activated automatically. The high entropy of the extracted artifact indicates it is likely an obfuscated or packed payload.

Heuristics 5

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
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_off00000058.bin` `62fa6f62db7963719c91f9781a9e9ec2cb9d9e3258464c388ecd88eaacfe81f2`	rtf-objdata-decoded	RTF \objdata at offset 0x58	280845 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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