RTF malware analysis — malicious · dd02ca1f54ebd488

MALICIOUS

RTF

522.3 KB Created: 2019-09-30 14:12:00 First seen: 2020-08-25

MD5: 19c58a64089e8eeb1601799f424f2d00 SHA-1: 3cc5e1a4bb72adcc6397872851e7b09e912a1381 SHA-256: dd02ca1f54ebd488348d8d0a175d691cb6d90bd47bbe362d6a45549d606f2512

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_off00002a47.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A47	40538 bytes
SHA-256: `88232fb9da6878399e531d2516d6eae5b953d957a9cc739213b2c7aaa58b040b`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.50, consistent with packed or encrypted content.
`objdata_01_off00016b8f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16B8F	40554 bytes
SHA-256: `1b177f1db1e4ad65c9aa6e57327fb9b3a269785d69a752a7b20e7dbd6ccf1f12`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.50, consistent with packed or encrypted content.
`objdata_02_off0002acf9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2ACF9	40554 bytes
SHA-256: `ee72c9b3ae0a1ea182bd66a7c879e0bdc6ad92481473fe7359d5b76270bb4485`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.50, consistent with packed or encrypted content.
`objdata_03_off0003ee63.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3EE63	40554 bytes
SHA-256: `09d8bd70f59a50fd50714ea169b92412eb4bc55093885e20179f790a6064814b`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.50, consistent with packed or encrypted content.
`objdata_04_off00052fcd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x52FCD	40554 bytes
SHA-256: `bbf4176a64bee0be42534b157edd29a0a6eee41613dce73a6cd06e79ef1d8eb8`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.50, consistent with packed or encrypted content.
`objdata_05_off00067137.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x67137	40554 bytes
SHA-256: `2de3f4d873004a01bd1f5bb10d605bca87f6f686e13c8783266c35e5563431ba`
Detection ClamAV: Xls.Malware.Stratos-7506050-0 Obfuscation or payload: likely Carved artifact entropy is 7.50, consistent with packed or encrypted content.

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