RTF / .DOC malware analysis — malicious · 81c6f08763168a4f

MALICIOUS

RTF / .DOC

1.23 MB

MD5: 663644ef10090b7b93ff5c5239e6a17e SHA-1: d57197cff1ef172ce640042a46937a2790cace37 SHA-256: 81c6f08763168a4ff6360b2a904896d96ac1ad8d5e164af52b7d43e0d5bc03dc

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains OLE object data and triggers critical heuristics related to CVE-2017-11882, indicating the exploitation of a vulnerability in Microsoft Equation Editor. This exploit likely decodes and executes a secondary payload, as suggested by the presence of a PE file within the OLE object data. The excessive hex data further supports the hiding of a malicious payload.

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 ~1284KB 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_off0000108e.bin` `bda9bb937c582846c135b26bd4de624ca07c5ea62e6c624cd0071560948a58da`	rtf-objdata-decoded	RTF \objdata at offset 0x108E	642403 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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