RTF / .DOC malware analysis — malicious · 0b79d0739785e86f

MALICIOUS

RTF / .DOC

2.48 MB

MD5: 752ca4e392e394f754a13e7ea56af4b1 SHA-1: 39d7f3f30a88c78cbd121e8d949354f4754e3069 SHA-256: 0b79d0739785e86f03c3e6328cff93b7f978a7e39d820d103e74d28ff112b7be

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically identified as related to CVE-2017-11882, which is a known vulnerability in Microsoft Equation Editor. This vulnerability is typically exploited to execute arbitrary code, often leading to the download and execution of a secondary payload. The high entropy and size of the extracted object data further suggest it contains a packed or obfuscated executable.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2596KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000044.bin` `e73622a0776f620dcbaeb8d8892c075bcbba66b7f44c9112b4e03648cf2d2bf4`	rtf-objdata-decoded	RTF \objdata at offset 0x44	1298174 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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