RTF / .DOC malware analysis — malicious · b5bed28eb2851ece

MALICIOUS

RTF / .DOC

542.7 KB

MD5: eaaeec3c87ce00f61b45dc39da6f2ec0 SHA-1: b0d17cebf7537e9d0e941881a7741b745e57c1e8 SHA-256: b5bed28eb2851ece15c0cff9215e9cd3b4bd212950f866999d3e7d349f5bc8d6

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The file is an RTF document that contains an embedded OLE object. Heuristics indicate that this object is a decoded Equation Editor payload, specifically related to CVE-2017-11882. This vulnerability is known to be exploited to execute arbitrary code. The presence of ` tf1 ouicompatonttbl0decorcharset0nil s240 Arial;{\* evtbl{\* ev0s240 Arial;}} ouicompat

Heuristics 5

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 2 \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_off00001817.bin` `f235a8569c6edcd9dc035a2542307e57857d3db68b4dba17ebc05f5f2168430b`	rtf-objdata-decoded	RTF \objdata at offset 0x1817	219859 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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