Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1f5c0596088d0ffb…

MALICIOUS

RTF / .DOC

29.5 KB First seen: 2022-12-08
MD5: f2ff7bd477cc7079da1fdfd12f8c66cb SHA-1: ab1def23933d9a1b282367e93e3a6670f8b68937 SHA-256: 1f5c0596088d0ffbea143df61b4e6de2eea633250131802d62535f3718693ed3
200 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object specifically identified as related to 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 would trigger the exploit. This is a common delivery mechanism for initial access, often leading to the download of further malicious content.

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_off00004688.bin
c798e9b64aa23131a5aa4db3ab029a0ad12f05bc79fda2e8eb2d4856cb6a07a7		 rtf-objdata-decoded RTF \objdata at offset 0x4688 1895 bytes

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