Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 23a865d4a1205be4…

MALICIOUS

RTF / .DOC

2.55 MB
MD5: 59f9c2a162cf48fe5819f58b697c107c SHA-1: f8702f19bae3a9f2dd1fca58f6eae3d6e62d4878 SHA-256: 23a865d4a1205be496c45012233d96255c90102e3925dab252d30d9a70f82ba9
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains multiple indicators of exploitation targeting the Equation Editor component, including specific CLSID and OLE object data. The presence of excessive hex-encoded data within OLE objects suggests a hidden payload. The embedded URL, though marked as benign, is likely part of the initial lure or a secondary stage download.

Heuristics 7

  • 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.
  • 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.
  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1624KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL https://bit.ly/2TE7JJq

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00105c85.bin
3d9c4103c4517ccdb0c838d01c889e3488e7ae32cfead8687a7db4385af5694e		 rtf-objdata-decoded RTF \objdata at offset 0x105C85 801872 bytes

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