RTF / .DOC malware analysis — malicious · ac8f156141fefcb6

MALICIOUS

RTF / .DOC

367.8 KB

MD5: 054d7f522fdd0c43ce782bf05810a023 SHA-1: 64f4ebba20fbc8744c635392316aa3ee3e6b0836 SHA-256: ac8f156141fefcb65f941bcf4ec5ddd5c78b2388778b3a9b2e99cebd754fdfa5

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates exploitation of this component. The `RTF_OBJDATA` heuristic suggests that the embedded object is being used to deliver a payload, likely a downloader. The extracted file `objdata_00_off00001590.bin` is a suspicious artifact that warrants further investigation as a potential second-stage payload.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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
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_off00001590.bin` `8ffae142e44b5225e7c7827c5e10a0222385e9b314476a473ce4a42b515530d4`	rtf-objdata-decoded	RTF \objdata at offset 0x1590	185448 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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