Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3a1e69685a9f322d…

MALICIOUS

RTF / .DOC

24.6 KB
MD5: f28ee75067e58fa50be0e9d34695d4d0 SHA-1: addb4fdab88d1f2c41a13bb5115449e3cd46a132 SHA-256: 3a1e69685a9f322d9893e1872af9ec74d325c7678a3e6d92a45798f043b7c3f0
180 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of exploitation for CVE-2017-11882, specifically related to the Equation Editor. The presence of \objupdate and \objdata sections, along with a critical RTF_EQUATION_EDITOR heuristic firing, strongly suggests this vulnerability is being leveraged. The decoded object's ProgID 'eQuAtiON.3' is also identified. This exploit is typically used to download and execute a secondary payload, indicating a malicious intent to compromise the user's system.

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_off00001e28.bin
8c599432bcc8cc6a04e50dd6cffef56a61aa4f48ba2bc73740df71a167515d55		 rtf-objdata-decoded RTF \objdata at offset 0x1E28 1741 bytes

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