RTF malware analysis — malicious · 8a70832f0dd9a1a1

MALICIOUS

RTF

1.76 MB

MD5: ba4113500decc253d2bf68ccda10a046 SHA-1: ac20a12faa576393fea5f1c8d70729ef4771dfdc SHA-256: 8a70832f0dd9a1a1f771982821104d16317231f8e4f9487534b2180f3d939aea

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with decoded Equation Editor payload and a PE file. The presence of ".objdata" and ".objupdate" sections, along with excessive hex data, strongly suggests the embedding of a malicious executable. The critical heuristic firing on RTF_EQUATION_EDITOR indicates a likely exploit targeting this component to execute the embedded 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 ~1850KB 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_off0000005c.bin` `ad2b2d6767674c3e1eae7a5e45064e2fc7af6670a82dbf420c2a4bca79f805f6`	rtf-objdata-decoded	RTF \objdata at offset 0x5C	925128 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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