RTF / .DOC malware analysis — malicious · 534bbc448e79be37

MALICIOUS

RTF / .DOC

333.1 KB

MD5: c8504fe55dd0085ce7c39cd658517afb SHA-1: aa3884d7fb802121c1a65a8d1ec36349fe5a6106 SHA-256: 534bbc448e79be37f516e2f14520f65daff917b064ccf940e545f35550d13cba

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object, specifically decoded as a malicious Equation Editor payload. This indicates an exploit targeting the Equation Editor vulnerability to execute arbitrary code. The presence of ".objupdate" further suggests an attempt to trigger the OLE object's activation, leading to the execution of the embedded payload. The extracted artifact is a PE file, confirming the delivery of an executable.

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_off00000042.bin` `b5a8626ac3b29d9c216004c841873cc0cf6f5ac5aba6f7d2723572366076aef0`	rtf-objdata-decoded	RTF \objdata at offset 0x42	170439 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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