RTF malware analysis — malicious · 774a54300223b421

MALICIOUS

RTF

2.62 MB Created: 2007-05-25 11:15:00

MD5: 027f5ae272bbb6bbc3e1fdf230a4e3f6 SHA-1: 57142832e5453cb0e2c3e6c1a3d7536131b3ed72 SHA-256: 774a54300223b421854d2e90bcf75ae25df75ba9f3da1b9eb01138301cdd258f

184 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, with one specifically triggering the ".objupdate" directive, indicating an attempt to activate embedded content. The critical heuristic firing for CVE-2017-8759 confirms this vulnerability is being exploited. The presence of large hex-encoded data within OLE objects suggests a hidden payload, likely delivered through this exploit.

Heuristics 7

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1130KB of hex-encoded data inside \objdata sections — may hide a payload
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
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.
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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0025be09.bin` `adb4170defa619e508097b74351a09fee8c22c12a3de2ccf64d278576e3bcea6`	rtf-objdata-decoded	RTF \objdata at offset 0x25BE09	131746 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0029c373.bin` `1982dfcf6da3c5839ca0d22f219638b65950e2c8586afc4461b39d0c76747140`	rtf-objdata-decoded	RTF \objdata at offset 0x29C373	6847 bytes
`objdata_02_off0029c38d.bin` `836c1996986d5c66632bdfecd2ddbeb89030a3566f3185f46fef4a1a02ee5307`	rtf-objdata-decoded	RTF \objdata at offset 0x29C38D	6843 bytes

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