RTF / .DOC malware analysis — malicious · 7312e4d88a96b1c5

MALICIOUS

RTF / .DOC

284.2 KB

MD5: 13b0f950e6053f758330793454df0d1e SHA-1: 8a8421007b2af55e8381a5625a3e5f07794ad8b0 SHA-256: 7312e4d88a96b1c5cfda9a0edefd206400aff65cdb05ac599ed7adcf8bf166f9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document containing OLE object data, specifically related to CVE-2017-11882, which is a known vulnerability in Microsoft Equation Editor. This vulnerability is often exploited to execute arbitrary code. The heuristic firings strongly indicate the exploitation of this CVE, likely leading to the download and execution of a secondary payload, as suggested by the extracted artifact objdata_00_off00001931.bin.

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 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_off00001931.bin` `50e8bc5cb9df1dad0369c2736b42cc58f109ef65dfdf863aab3c46a9d7a06167`	rtf-objdata-decoded	RTF \objdata at offset 0x1931	142119 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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