RTF / .DOC malware analysis — malicious · fa44871887ccc408

MALICIOUS

RTF / .DOC

126.7 KB

MD5: ed2843eecb2d48bdbbbcda96e8836adb SHA-1: de7b71f132e8900f7c91e0e71a8bbbbc112f6fc7 SHA-256: fa44871887ccc40856d61cf835a54ef1404601d0c50fe4eaacac887abfd05645

142 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 contains an embedded OLE object, specifically identified as a decoded Equation Editor payload. This indicates exploitation of a vulnerability within the Equation Editor component to achieve code execution. The `RTF_EQUATION_EDITOR` heuristic firing confirms this. The `RTF_OBJUPDATE` heuristic suggests that the embedded object is designed to be activated automatically. The primary attack vector is likely a spearphishing attachment, leading to the execution of a malicious 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_off00001963.bin` `dc919caa58a120fbd9fc0fad09bdcccd7c57d22cb6392d83865c54cff6677ee0`	rtf-objdata-decoded	RTF \objdata at offset 0x1963	61559 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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