RTF / .DOC malware analysis — malicious · 486d056dcda7b96b

MALICIOUS

RTF / .DOC

485.9 KB

MD5: f57566d81832c3723e701b4d634b84c3 SHA-1: 5e75b2f653bdea4c88d8c244fc165fa7cceafd6c SHA-256: 486d056dcda7b96bde210500e726ccc5a7422b831a7e61f88227113af7ca8805

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically related to Equation Editor. Heuristics strongly indicate the exploitation of CVE-2017-11882, a known vulnerability in Microsoft's Equation Editor. This vulnerability is typically used to execute arbitrary code, suggesting the RTF document is a delivery mechanism for a secondary malicious 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.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off00000042.bin` `8f6d73f6cff8f2729f75563424ff10b3740759fb497f3df5254665c726d9a648`	rtf-objdata-decoded	RTF \objdata at offset 0x42	248702 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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