RTF malware analysis — malicious · 196fd390988f847c

MALICIOUS

RTF

528.3 KB Created: 2019-09-30 14:11:00 First seen: 2020-09-04

MD5: 2833c8c7f0820521ecdd05214b4cfadf SHA-1: b1a8f256684537957067f32e0c873043da1f7dd0 SHA-256: 196fd390988f847ce21ce168dbeb86bde2371bfb5c7c8b85a05afdeb38c61778

264 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and uses \objupdate to force their activation. The critical heuristic firing for CVE-2017-8759 indicates exploitation of MSXML SAX OLE activation, a known vulnerability used to download and execute arbitrary code. ClamAV detections on the main file and extracted artifacts further confirm its malicious nature, classifying it as Xls.Malware.Stratos-7506050-0.

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.
ClamAV: Xls.Malware.Stratos-7506050-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Stratos-7506050-0
\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.
OLE object data medium RTF_OBJDATA

RTF contains 6 \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 In RTF body

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002a45.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A45	41050 bytes
SHA-256: `dca808820f17ae4bf7090e22924f06b712a1de32d570d44f1b67875558826c8a`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.49, consistent with packed or encrypted content.
`objdata_01_off00016f95.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16F95	41066 bytes
SHA-256: `ac49e55d517f7d972ea532e2d97c30542cbf9ac6e0ff46e206188d8afd789e19`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.49, consistent with packed or encrypted content.
`objdata_02_off0002b507.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2B507	41066 bytes
SHA-256: `70680f5f287cc34cd1e36f099c532dd9a652f32a1e45018e428ef934cd189f98`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.49, consistent with packed or encrypted content.
`objdata_03_off0003fa79.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3FA79	41066 bytes
SHA-256: `656e7d30249bc84b4ddbeb662f6a820631483fcdc4f5aa6647a6708a4a07b64b`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.49, consistent with packed or encrypted content.
`objdata_04_off00053feb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x53FEB	41066 bytes
SHA-256: `1ac5dd526f5de2239d2b37159cf5c29016387d07016a753ddfeade6bdd320990`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.49, consistent with packed or encrypted content.
`objdata_05_off0006855d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6855D	41066 bytes
SHA-256: `338870126ed9e69c617e9a86bfc9cf49c390d1a8e35f53f08fcaf7cefbe606cd`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.49, consistent with packed or encrypted content.

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