RTF / .DOC malware analysis — malicious · 9fb72520806457c3

MALICIOUS

RTF / .DOC

931.8 KB

MD5: b9369e03168ac583f625ec6e09b34303 SHA-1: c1ab1a9b3b3b787fa28cd34cbdf3088f175f6b94 SHA-256: 9fb72520806457c30e209c9cf36d02bf1a8a0ba066752ccbd2b4abca54fc4fab

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an RTF document that contains an embedded OLE object, specifically decoded from the Equation Editor. This indicates an exploit targeting the Equation Editor vulnerability. The heuristic firings strongly suggest that this object is a PE file, likely a downloader. The RTF_OBJUPDATE heuristic indicates that the object is designed to be activated automatically, leading to the execution of the embedded payload. The primary IOC is the extracted object file itself, which is the 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.
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_off0000167d.bin` `93530e4296881cb3d083ee865e45ee09c9be8f3e21a7b27c3311c4ff2a52fc52`	rtf-objdata-decoded	RTF \objdata at offset 0x167D	474088 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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