Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d33600cf3455aab5…

MALICIOUS

RTF / .DOC

1.57 MB First seen: 2022-09-14
MD5: f1836caa7de9e972ce291204f846e68a SHA-1: 97da060747eaeda0c59e5a0ac9fed7cc71edf30e SHA-256: d33600cf3455aab52bcc16116eab1448c7b8c2fb7983cdf8944d2c17bfbf53e6
180 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object specifically identified as an Equation Editor object, triggering heuristics related to CVE-2017-11882. This exploit is known to facilitate the execution of arbitrary code. The presence of ` tf1

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000129e.bin
3bc47e54383b910bb226d1b979d79565154925aea77f2e54c6f539739d41c5e7		 rtf-objdata-decoded RTF \objdata at offset 0x129E 80884 bytes
objdata_01_off0002ec04.bin
f7b929ce489dfb0e55f3383a35fdd691eace09a148b71bdce40ecf74b197fdc5		 rtf-objdata-decoded RTF \objdata at offset 0x2EC04 346461 bytes

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