RTF malware analysis — malicious · cd0f483a8b9c5ec8

MALICIOUS

RTF

403.8 KB Created: 2019-01-07 23:54:00 First seen: 2021-06-04

MD5: 2c93fb1a782b37146be53bd7c7a829da SHA-1: 085518dabedac3abdb312fdd0049b7b5f9af037a SHA-256: cd0f483a8b9c5ec8f934167b1bf563a330b307c8d49e7acf2333268e058c64e9

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple OLE object embeddings, with specific rules indicating the presence of package objects and an \objupdate command designed to force OLE activation. This suggests the file is designed to exploit vulnerabilities within OLE object handling to execute arbitrary code. The embedded object file 'objdata_00_off00000b2c.bin' is the primary artifact of interest.

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 4 \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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000b2c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB2C	47150 bytes
SHA-256: `aaeda3aa99a4b19d28ad27db4d04643527b8ebd78b4cca877e9cf50da1d84946`

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