RTF malware analysis — malicious · 15369a16d528e4f9

MALICIOUS

RTF

5.75 MB First seen: 2020-05-25

MD5: d596d8fec0da33b36701c6cba5206e72 SHA-1: 3788c9cb46c3bbca73c0b6ff0bd254fb88a10a64 SHA-256: 15369a16d528e4f914083e6175be1d6ca384902a81652df54ac19d29f596c8c6

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and specifically triggers heuristics related to Equation Editor vulnerabilities and OLE activation. The presence of a large, high-entropy OLE object suggests it is used to hide a payload, likely exploiting a known vulnerability in the Equation Editor component to achieve code execution. The file is classified as malicious, and the primary IOC is the extracted OLE object.

Heuristics 7

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
\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 ~6026KB 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_off00000095.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x95	3013181 bytes
SHA-256: `b0e30d2d17d295673f69647e2a9ab8ee40f8c016f5cbb7458fdd5772a0d734bf`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.

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