RTF / .DOC malware analysis — malicious · 904682f2f6b4f09a

MALICIOUS

RTF / .DOC

1.95 MB

MD5: e0117872d24d4e71e98bc345c72655f1 SHA-1: 599829f9d14603a45098c9f5cb97de24da4661b7 SHA-256: 904682f2f6b4f09a6b876294ed4c2153814408b700d72830c47bcdf443e75ba2

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability. Static analysis indicates that this object decodes to a PE file, suggesting it's designed to download and execute a second-stage payload. The presence of excessive hex data within the OLE object further supports the hypothesis that it's used to hide a malicious payload.

Heuristics 5

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 ~2045KB 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_off00000634.bin` `e4b5f78c6bb8351fd23084b2d6c6d60eabf8097d478689687b324aae56df1c35`	rtf-objdata-decoded	RTF \objdata at offset 0x634	1022589 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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