Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 044ba8586549a681…

MALICIOUS

RTF / .DOC

27.6 KB First seen: 2023-01-19
MD5: 30e47f7cad851860cddb407b02efec74 SHA-1: 689c256ccb6ae346bac5963d287e1ee985c55454 SHA-256: 044ba8586549a68145ea8b3d52a280d8732b0e2d2a496cde7671a3248a974efb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The document body contains a lure to enable editing, common for macro-based malware delivery. The embedded object is specifically identified as related to Equation Editor activation, indicating a likely exploit attempt to download and execute a secondary payload.

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_off00004cfd.bin
deec75b4811c860608c75141d066e6664be37c36790fbff9cad3eb0ed5f3705c		 rtf-objdata-decoded RTF \objdata at offset 0x4CFD 1701 bytes

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