Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 db7622469f1b733c…

MALICIOUS

RTF / .DOC

24.9 KB First seen: 2022-12-22
MD5: 855bc40136cd3ebdf5d5383344c2fbe2 SHA-1: db2d32e3820afa790f6b5a1b6ac3e1dff127bbc9 SHA-256: db7622469f1b733c9a8fcbe70b9f2524b47ebbfdb1769c9c8e7f88fd504af5a0
200 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object specifically targeting the Equation Editor vulnerability (CVE-2017-11882). The presence of \objupdate and SE_ENABLE_LURE heuristics indicates the document is designed to trick the user into activating the object, which then likely executes a malicious payload. No scripts were extracted, and the document body is a generic academic assignment, suggesting the lure is the embedded exploit rather than social engineering within the text.

Heuristics 6

  • 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 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000041d5.bin
221a3084f50861c8aa2703fd1ff701d5d8198c7161e61235d3e726515845372b		 rtf-objdata-decoded RTF \objdata at offset 0x41D5 1902 bytes

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