Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 86525e27722762b2…

MALICIOUS

RTF / .DOC

1.53 MB
MD5: 600af17df9e0037bd52a5896bacc0db4 SHA-1: 5acf458a85c6c306951fd0b67a131eb59e389a9f SHA-256: 86525e27722762b2bb28fdd70b0512fc0b0d770ea5ca76b017ab2c5b12b825ee
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains multiple indicators of exploitation targeting the Equation Editor vulnerability (CVE-2017-11882). The presence of OLE object data, objupdate, composite moniker, and Ole10Native stream strongly suggests an attempt to execute a payload. While the embedded URL was labeled benign, the overall structure points to a malicious document designed to deliver a secondary payload.

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 ~1603KB 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/2Rrn2ES

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000655.bin
241499ac9dcd35a002132f438a127d25a83da15fe99b2fe8b41cbf2bbf000961		 rtf-objdata-decoded RTF \objdata at offset 0x655 801872 bytes

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