Malicious RTF — malware analysis report

Static analysis result for SHA-256 00a487f5c24ab673…

MALICIOUS

RTF

51.6 KB Created: 2022-07-26 02:21:00 First seen: 2022-07-27
MD5: e5aaf4b595a3b4fdd0b7191290525f63 SHA-1: a980f5b85babe549b2c32e558ae353a738f5dcfb SHA-256: 00a487f5c24ab673b727515ed2f67f1035c53e0035beaf8bce4c2f1f1b4300d1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The sample is an RTF document containing an embedded OLE object, specifically identified as Microsoft Equation Editor. This strongly suggests exploitation of a known vulnerability (CVE-2017-11882) within the Equation Editor component to execute arbitrary code. The presence of the Equation Editor CLSID and object class are critical indicators of this attack vector. While no specific malicious URLs or scripts were directly extracted, the exploitation of the Equation Editor is a common method for initial payload delivery.

Heuristics 6

  • 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
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000041d1.bin
8f286ad2eeeec2e6265b310c4e10368cab7310fe1a984bb7d22d83acab2b0744		 rtf-objdata-decoded RTF \objdata at offset 0x41D1 7470 bytes

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