RTF malware analysis — malicious · 1b53db572193ba98

MALICIOUS

RTF

715.7 KB Created: 2019-05-28 14:44:00 First seen: 2019-08-04

MD5: 1e9445c13b384ecf86096cb409900bbb SHA-1: cb4615ce58c9f58c10b20b1f28d56aa310b3ddee SHA-256: 1b53db572193ba9879d2f523a7a3233dca423f102e22342df985373ce63210b3

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 one specifically triggering activation via \objupdate. The critical CVE-2017-8759 heuristic indicates exploitation of MSXML SAX OLE activation, likely to execute embedded content. The presence of multiple embedded objects and the specific exploit suggests a malicious document designed to deliver a payload upon opening.

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 5 \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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000290e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x290E	57390 bytes
SHA-256: `3757208c7f3681f11edf2e6aa635d758f48ac2fadf6e2a60979b305db96b9c34`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off00024531.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x24531	57390 bytes
SHA-256: `65aca74786d90b0ccd60ca94b84233abbd17ebaa7b326c7b71810a2dda76cea3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00046154.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x46154	57390 bytes
SHA-256: `f368dabd50f894d37fe0c9b4540da1dbcc744b42acd81ab0a841dd2abf0fdc43`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off00067d77.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x67D77	57390 bytes
SHA-256: `0b0286eabc6947ca95c190959a1e21d2e970c63743532997c17ca492a60efde2`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off0008999a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8999A	57390 bytes
SHA-256: `d283af45570b3cd881fa0a87f9649ec471c8a9ed2618e84a8f507344587e8250`
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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