RTF / .DOC malware analysis — malicious · 8c40ddca3c9192da

MALICIOUS

RTF / .DOC

4.21 MB

MD5: bf6d8313ec37fb0e1dc0e24e41a57df5 SHA-1: 01bf04ea4112bcb27c73f11d411bb372f1cee820 SHA-256: 8c40ddca3c9192daf2dc075e636e70c156a3cf35cd88fdb5562ce8db06774856

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file contains embedded OLE objects, specifically related to the Equation Editor, which strongly indicates exploitation of CVE-2017-11882. The presence of a large, high-entropy OLE object suggests it is used to hide a second-stage payload. No document body text or scripts were extracted, making the exact nature of the payload and its delivery mechanism beyond the initial exploit uncertain.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~4412KB of hex-encoded data inside \objdata sections — may hide a payload
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_off000000d6.bin` `b98ea9511855e4e3d7c0b27bc2e6a32ad0b424509e54a76475c0fd3e70ad2356`	rtf-objdata-decoded	RTF \objdata at offset 0xD6	2206292 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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