RTF malware analysis — malicious · 81082fe9603a2de8

MALICIOUS

RTF

489.4 KB Created: 2019-01-07 23:54:00 First seen: 2019-05-16

MD5: c9e0edfc4dfff2ea0a6c9bea2c9783a4 SHA-1: 6b3e4e084bd2dd9930ec0596849071b14f44df54 SHA-256: 81082fe9603a2de82ec5442406493ca9f84557837ce39440caf3832a15dd2efa

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with specific heuristics indicating that \objupdate forces OLE activation and that a Package object class is present. This suggests the file is designed to exploit OLE object handling to execute embedded code. The extracted artifact objdata_00_off000024b1.bin is flagged as suspicious due to VBA auto-execution signals, further supporting the malicious intent.

Heuristics 6

\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
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 6 \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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000024b1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x24B1	45614 bytes
SHA-256: `435e6053750faa6f18013fa5d5c9b9b5aa4ed3ee4e6a1380dd4f7d5315afc7f3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off00072f3c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x72F3C	1090 bytes
SHA-256: `e1f2c58dc31b3e59112f8bf2adf785030e9c14bab4c334697a359ff8ad9786e7`

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