RTF / .DOC malware analysis — malicious · 8d0f10d9456781c9

MALICIOUS

RTF / .DOC

3.16 MB

MD5: 76958f4f471ee199e4a3a78ed673b38a SHA-1: 46ba182aad51905d8532b148dce687ff29d63ee6 SHA-256: 8d0f10d9456781c9354bf16ce778046092a5dc0c299f2ea8c1bb4977103ab821

262 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple indicators of exploitation, specifically related to the Equation Editor vulnerability (CVE-2017-11882). The presence of OLE object data, automatically linked OLE objects, and decoded Equation Editor payloads strongly suggests this exploit is being used. The embedded artifact 'objdata_00_off000000a7.bin' is likely the second-stage payload. The document body contains only a number, providing no contextual lure.

Heuristics 7

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 ~3185KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \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_off000000a7.bin` `cfd8c0f123dc589a6d45a96740c960f8fe2c62d60364d91612f8e559ef0ddb7a`	rtf-objdata-decoded	RTF \objdata at offset 0xA7	1607169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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