RTF / .OLE malware analysis — malicious · 35db1a2a7ff3d2d8

MALICIOUS

RTF / .OLE

250.9 KB First seen: 2020-09-15

MD5: 5c16523a2267303d611854168918fea0 SHA-1: 92a43b0e860192b7d4f06c031190b49ee4d155eb SHA-256: 35db1a2a7ff3d2d81057db8c3901dd766171613fde771fbf8183067c36f10a68

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The RTF document contains multiple embedded OLE objects and triggers an \objupdate event, indicating it's designed to activate embedded content. The 'SE_ENABLE_LURE' heuristic confirms the document explicitly instructs the user to 'Enable Editing', a common tactic for macro-based malware droppers. While no scripts were directly extracted, the OLE object activation strongly suggests the intent is to execute embedded code, likely a downloader for a second-stage payload.

Heuristics 6

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\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 4 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000b63.bin` `a2e6bf0c70a40c975d9800cb0cf1db4bd2f138d01cf72e91ca153982baa6d202`	rtf-objdata-decoded	RTF \objdata at offset 0xB63	32356 bytes
`objdata_01_off00010930.bin` `12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece`	rtf-objdata-decoded	RTF \objdata at offset 0x10930	12261 bytes
`objdata_02_off00016940.bin` `b14a178e0947279881edb10b84888bdffd182cb1bb998352c67d31d562f87d28`	rtf-objdata-decoded	RTF \objdata at offset 0x16940	2632 bytes

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