RTF malware analysis — malicious · d883b4d00fecc7db

MALICIOUS

RTF

145.5 KB First seen: 2025-03-14

MD5: 1064b630d5e510a43215b05a2e48c9a5 SHA-1: 631c1523d1320d2bf5facf53fb42dd65b087404f SHA-256: d883b4d00fecc7db46a8614f087d2e123c6d483253f966d79b848a4256ee92ea

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. The presence of OLE object data and the ".objupdate" directive strongly indicate an attempt to activate embedded malicious content. This technique is commonly used to download and execute further stages of malware.

Heuristics 4

Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000126f.bin` `9b3773cd88ad0803b2089ab40770231982ced96ed63f3e72705126cf4f3575b4`	rtf-objdata-decoded	RTF \objdata at offset 0x126F	4200 bytes

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