RTF malware analysis — malicious · b0f8dd641769a080

MALICIOUS

RTF

501.6 KB Created: 2020-04-14 22:43:00 First seen: 2020-09-07

MD5: 80e6235a6337d6f74caca931cbae2ae0 SHA-1: c5a4d214b98cede25607061e12ad044a6ed4531c SHA-256: b0f8dd641769a080b640dbaa2666b5982344642335372ee4680fa5a6e771991d

122 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 specific heuristics indicating that \objupdate forces OLE activation and that a package object class is present. This suggests the file is designed to exploit vulnerabilities related to OLE object handling for client execution. The presence of an embedded URL, though benign, further supports the possibility of a downloader or exploit delivery mechanism.

Heuristics 5

\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
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/offi In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002601.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2601	42555 bytes
SHA-256: `df047f58f07c3be298229192503ec01aa03f587eaa06eec911a9e027b1166b99`

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