RTF malware analysis — malicious · d17d70143510d2b6

MALICIOUS

RTF

1.89 MB Created: 2019-07-08 14:06:00 First seen: 2019-08-04

MD5: 2c576dcc8d01bb68461d1ded28425a9f SHA-1: 1bcda225f173d55c601db1b0b5a2334d5a7e8534 SHA-256: d17d70143510d2b6740f41ea2e7e440ff8880107044dc4c4a2341615bff9c9ad

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects, with one specifically triggering the CVE-2017-8759 vulnerability. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of large hex-encoded data blocks within the OLE objects further suggests the hiding of malicious content.

Heuristics 8

CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
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.
\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 ~1279KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000a0c0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA0C0	304686 bytes
SHA-256: `6eb14454ee551f3a1b84d81f949a6bd7185a7c6ba0fa1d6392517fd10319dfd3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off000a5837.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA5837	304686 bytes
SHA-256: `fb3721c62f34f7ca098b86bdf73f06c389f0489ca781e98c76e5b7813a05edea`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00140fae.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x140FAE	304686 bytes
SHA-256: `c92b5166c818516cde1492457bb6a3513f49917ed4ffa5ab3d6559c0a915cbcd`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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