RTF / .DOC malware analysis — malicious · 94e9a2f9995608be

MALICIOUS

RTF / .DOC

1.20 MB

MD5: 135e805ab350429fba54464cd79e6a3a SHA-1: 595e02f6140e1cf5f75f60c396161a697b444f8e SHA-256: 94e9a2f9995608befac07d5ef3df47df08a2782cb49eebd20381337840312f13

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE object data, specifically decoded Equation Editor payload and PE, indicating a likely exploit. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly suggests the exploitation of a vulnerability within the Equation Editor to execute arbitrary code. The large amount of hex-encoded data within the OLE object further supports the hiding of a malicious payload. The extracted artifact `objdata_00_off0000135f.bin` is likely the dropped or executed payload.

Heuristics 6

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 ~1253KB 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_off0000135f.bin` `b7821c1c41c293b91a696b42181ae5e35a20a690375c7c17d4b8dd163f9a0ef5`	rtf-objdata-decoded	RTF \objdata at offset 0x135F	626561 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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