RTF / .DOC malware analysis — malicious · ed834397ad249dc0

MALICIOUS

RTF / .DOC

300.5 KB

MD5: bc850f50896f255702a2383c432073ef SHA-1: edcf07d1c98d504c645497829e98f2a6e169c61a SHA-256: ed834397ad249dc0ae2fdf4df6c8aa214666266a90ff0a67355fb6b6b5b30f8b

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document containing an OLE object that exploits CVE-2017-11882. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_RELATED` heuristics strongly indicates this vulnerability is being leveraged. The `RTF_OBJDATA` and `RTF_OBJUPDATE` heuristics suggest the embedded OLE object is designed to be activated, likely to execute a secondary payload. No document body text was available for analysis, but the technical indicators are sufficient for a high-confidence assessment.

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.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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
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_off00001901.bin` `4308b61b2c9832b1a6cb2b2ae68341c3ac1a9c15eb4e933b25ab10057b44faf0`	rtf-objdata-decoded	RTF \objdata at offset 0x1901	100213 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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