RTF malware analysis — malicious · 5d6af79217df3d4e

MALICIOUS

RTF

17.3 KB First seen: 2019-02-10

MD5: 918e3fcc62d4b370894b651f7c51acec SHA-1: 74288546f7ce052f7068b59d2233a43263044481 SHA-256: 5d6af79217df3d4ea7427d76c3b652dd133255fca54a6d6263c56ef3997f4b8c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains OLE object data and uses \objupdate to force activation, indicating an attempt to exploit OLE vulnerabilities for execution. The embedded OLE object, decoded as 'objdata_00_off00000ef3.bin', is the primary artifact of interest. Without further script or body content, the exact payload and delivery mechanism remain unclear, but the technique strongly suggests a malicious attachment designed to execute arbitrary code.

Heuristics 3

Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
\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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ef3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF3	4666 bytes
SHA-256: `d01d849060fd78078b09a1d084961befb9546d057b8f2a036fdd5d8c54a3b784`

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