Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 99b01053f3145180…

MALICIOUS

RTF / .DOC

4.6 KB
MD5: 9441cbccde604359745e69c5166d39ae SHA-1: b2afc577e9a66fa22ab10ab0842a0734d574789a SHA-256: 99b01053f31451809f38ec1663293095fb3acdc6731a05b82afcfbd8b118d3a5
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability through the Equation Editor. This exploit allows for the execution of arbitrary code upon opening the document, likely leading to a second-stage payload download or execution. The presence of multiple RTF-specific heuristics, including critical and high-severity firings related to Equation Editor and OLE object activation, strongly indicates this attack vector.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000008a.bin
5fea8ad89eaefd260bb8836bf3afc4ce056e312109167a8d1d924dfdd76e6053		 rtf-objdata-decoded RTF \objdata at offset 0x8A 2117 bytes

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