RTF malware analysis — malicious · eaaae2a6fafb711d

MALICIOUS

RTF

619.7 KB Created: 2019-01-07 23:54:00 First seen: 2019-09-30

MD5: 4e23196997557c02853c6e6e399709d9 SHA-1: 06f0ef7e9ac407dc739e24f76dca5529af797713 SHA-256: eaaae2a6fafb711d0653835248b694da9edf30c608e3d779f6485de0fe8f81e7

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 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_off00002435.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2435	58926 bytes
SHA-256: `65226be29643c335e7d896207dc932b6e1321d9db3a069699efcff544eef0036`
`objdata_05_off0009370a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9370A	1271 bytes
SHA-256: `be306341e1481ee02d5ad0fc72cde5c3575623c29b0958bc66c51e5592bb193f`

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