Malicious RTF — malware analysis report

Static analysis result for SHA-256 0813f7168496b37a…

MALICIOUS

RTF

319.4 KB Created: 2020-03-23 12:50:00 First seen: 2020-07-24
MD5: 2ec89c76f344fdbef435ed21f06ff108 SHA-1: 87dfc2f41a2683ed0127a9d9550282a4a729a51e SHA-256: 0813f7168496b37a65b461c824b24daed685e6e31a5c85b309cdfeb659c17f91
122 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects with embedded data, and the ".objupdate" directive indicates an attempt to trigger OLE activation. This strongly suggests the file is designed to exploit vulnerabilities related to OLE object handling for client-side execution. The presence of a benign URL does not detract from the malicious indicators.

Heuristics 5

  • 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 5 \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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ba7.bin rtf-objdata-decoded RTF \objdata at offset 0x2BA7 18491 bytes
SHA-256: f31d507b1dbb2cd8c0dc6da7a603550b3f53e6bbfe746bd7ab8a72d149990c9f
objdata_01_off000111ac.bin rtf-objdata-decoded RTF \objdata at offset 0x111AC 18491 bytes
SHA-256: fa9f245e5079f8e84155e949bb8a8d16c0b0e5e7ce92497c407419d32df3ab6b
objdata_02_off0001f8b6.bin rtf-objdata-decoded RTF \objdata at offset 0x1F8B6 18491 bytes
SHA-256: 4202a73e7fe27651d4ef68360e57dd7fb88b714893a1a9d6e2be7a8cc5321d2c
objdata_03_off0002dfc0.bin rtf-objdata-decoded RTF \objdata at offset 0x2DFC0 18491 bytes
SHA-256: c4d7f72506a881c03ea2dbc5a73a1bdbc5a328d9971b0d55a513f9121fa46353
objdata_04_off0003c6ca.bin rtf-objdata-decoded RTF \objdata at offset 0x3C6CA 18491 bytes
SHA-256: 666b325d69a245511a8b9b7895abb69b54124acaee848eaa576acbb0fec8a4de

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