RTF / .DOC malware analysis — malicious · 0bc2b4aa2a7be463

MALICIOUS

RTF / .DOC

1.20 MB

MD5: 94d6f1db691003aa35511a2d259c4b7f SHA-1: 64fdc3861661b3de10abf3e3ae090623e4216ef3 SHA-256: 0bc2b4aa2a7be463e90d3629bc8d2d5b43e1f5053ff4551797fbb1386ccc8fad

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE object data, specifically related to CVE-2017-11882, which is indicative of exploitation for client execution. The critical heuristic firings confirm the presence of a decoded Equation Editor payload and a PE file, suggesting the document is designed to download and execute a secondary malicious artifact. The extracted artifact 'objdata_00_off00001aad.bin' is likely the dropped payload.

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.
\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 ~1252KB 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
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_off00001aad.bin` `7374bb358c8462c25cc707130677876112f3eef3d84e7bd590e2f4600017d01a`	rtf-objdata-decoded	RTF \objdata at offset 0x1AAD	626264 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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