RTF / .DOC malware analysis — malicious · 4655abf24bcd2f0e

MALICIOUS

RTF / .DOC

256.8 KB

MD5: 59ed1aab3071d7f437cd3bf2b174dbcd SHA-1: b5824490723cbd3f783b338d8f98385de66bd53e SHA-256: 4655abf24bcd2f0eec2cdb7114e9f5651b6a7b3d638d51e8f0cdf14ba05e298d

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains embedded OLE object data, specifically decoded Equation Editor payload. This indicates an attempt to exploit a known vulnerability, likely CVE-2017-11882, to execute arbitrary code. The presence of ".objdata" and ".objupdate" sections further supports the exploitation of OLE object handling within RTF documents. The extracted artifact, objdata_00_off0000006a.bin, is likely the delivered PE 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.
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_off0000006a.bin` `085bbdc52024a2e4f6443179b237c52a464ae6e0d973e982f49cff4d130a9852`	rtf-objdata-decoded	RTF \objdata at offset 0x6A	131329 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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