RTF malware analysis — malicious · 32de06229ab89b9c

MALICIOUS

RTF

434.1 KB

MD5: 31d1dcc6a9af21cf7cf2e4caa965e5f2 SHA-1: 3e2bba8bc725dad691c9e2972ae51c59290f8ae7 SHA-256: 32de06229ab89b9ca8948eb070e0fa9946dbc9d987e5acb9fe1020cd0bcd7896

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object related to Equation Editor, triggering critical heuristics for CVE-2017-11882. This exploit is known to download and execute arbitrary code. The presence of OLE object data and the ".objupdate" directive further indicate malicious intent to activate the embedded object. The decoded OLE object has high entropy, suggesting it contains executable content.

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.
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 2 \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_off00001430.bin` `f1724b55e998f55d4b1f02772747ee2f519405eb271ca6bb55e2a120261d6aad`	rtf-objdata-decoded	RTF \objdata at offset 0x1430	219573 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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