RTF / .DOC malware analysis — malicious · 8dd3fb2fb5da24cb

MALICIOUS

RTF / .DOC

415.7 KB

MD5: 3afce06e26bc62be33d5cc486eb08821 SHA-1: 1b14ae54b10c7d3dedc53a4fc02ef1efbc1e8215 SHA-256: 8dd3fb2fb5da24cb15ffd71bdd15b8df5ef76a37c50ce6c2e3b27e323f394d9a

202 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an RTF document that leverages the Equation Editor OLE object to exploit CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, indicating the file's primary purpose is to deliver a malicious payload. The embedded OLE object contains a PE file, further confirming its role as a dropper.

Heuristics 6

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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` `56041d7a564a0f8704c7b5eb477e94c78c11609a190cb755a1076c3bbe5eac4a`	rtf-objdata-decoded	RTF \objdata at offset 0x42	212725 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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