RTF / .DOC malware analysis — malicious · 871845546daad647

MALICIOUS

RTF / .DOC

3.43 MB First seen: 2022-05-23

MD5: e6de4796caa9a3ba3d2dea6728308202 SHA-1: afc79848be923d161c9c2ef5f07c316648f8ba19 SHA-256: 871845546daad6474e2814228f528366ed15124ea5f40ee75987133652dd883e

222 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious Link T1559.001 Component Object Model Hijacking T1059.003 Windows Command Shell T1204 User Execution

The file is an RTF document containing OLE object data, specifically related to the Equation Editor. Critical heuristics indicate the presence of a payload associated with CVE-2017-11882, a known vulnerability exploited via OLE object activation. The embedded artifact 'objdata_00_off00001508.bin' is likely the second-stage payload delivered by this exploit. No scripts were extracted, but the exploit itself is sufficient to establish malicious intent.

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 ~3592KB 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_off00001508.bin` `544d6f829605e2bd4f764d465cf3e7867c1133c84422919e12f7109030f5ab2e`	rtf-objdata-decoded	RTF \objdata at offset 0x1508	1796346 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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