RTF malware analysis — malicious · 9a089a6bb93e50d1

MALICIOUS

RTF

1.07 MB First seen: 2019-11-20

MD5: c7ceca35242dfc066e0878e56fb56a83 SHA-1: 0648ba50e2e5c526926e2d6b7b2f650580b9e3b8 SHA-256: 9a089a6bb93e50d1821f99e5836657afb26394b1e51c6cd8950558b84d1d11dd

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically related to Microsoft Equation Editor. Critical heuristics indicate the presence of a decoded Equation Editor payload and a PE file, strongly suggesting exploitation of CVE-2017-11882. This vulnerability allows for arbitrary code execution, leading to the download and execution of a secondary malicious payload. The excessive hex data further supports the hiding of such a payload.

Heuristics 6

Decoded Equation Editor payload + PE critical CVE likely RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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.
\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 ~1116KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 1 \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_off0000006d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D	558286 bytes
SHA-256: `ae54e5c7af9c0d1a746ee8f44345d3446ca10fb21bd99d339a3c16341a98b74c`
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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