RTF malware analysis — malicious · e7bd76a46dd955ac

MALICIOUS

RTF

681.4 KB Created: 2019-05-10 First seen: 2019-10-01

MD5: 4d81131b806e0c4c2366c447a782ff70 SHA-1: c18a28eac74f73ba3d3dd796df53ed03cc5142a3 SHA-256: e7bd76a46dd955acff699122753d2ca4c98be46d1d5123f14835cf0eccb29515

182 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 heuristics indicating that \objupdate forces OLE activation. Crucially, the CVE-2017-8759 heuristic fires, pointing to exploitation of MSXML SAX for OLE activation. This suggests the file is designed to execute arbitrary code, likely by downloading and running a second-stage payload.

Heuristics 6

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.
\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.
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 4 \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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002902.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2902	70190 bytes
SHA-256: `28f256b28bd446f821d2c71dde76f18c418937d001d6a0da8f01d171c1b26977`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off0002a9ed.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A9ED	70190 bytes
SHA-256: `21d8171af9407a7663ebd6a44aeb2cf77d722bf894a2f93475b2058eebd69b29`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00052ad8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x52AD8	70190 bytes
SHA-256: `6b54aa810687609fbdfaa2dac5abf9b597eb46202c1d694439938db3aa7ea92d`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off0007abc3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7ABC3	70190 bytes
SHA-256: `92792f51df871f205cbf58e3492ccacc5da17624d37888ea46b165a5ecd71d12`
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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