RTF / .DOC malware analysis — malicious · 5ccc217b190ae096

MALICIOUS

RTF / .DOC

1.35 MB First seen: 2022-09-29

MD5: 039cc247f962eb8473c155b1f7c7d49d SHA-1: d218f72751eb532dec08cf23c4897384993e945b SHA-256: 5ccc217b190ae0961a55b5f1b1f0ee47b4fb1172b6cefa660f0ef00bc9d3ee3e

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains OLE object data, specifically related to Equation Editor, which is a strong indicator of exploitation for CVE-2017-11882. The presence of ".objdata" sections and the "RTF_EQUATION_EDITOR" heuristic confirm this. The excessive hex data likely hides the malicious payload, which is designed to be executed upon OLE activation triggered by \objupdate.

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 ~1416KB 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_off0000009c.bin` `1ccfa33fdc097070c45a4fe5814f8a1b8bf81fec328be64a15229278f32d90e9`	rtf-objdata-decoded	RTF \objdata at offset 0x9C	708572 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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