Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 02e4d2f553043e2d…

MALICIOUS

RTF / .DOC

28.4 KB First seen: 2022-12-10
MD5: 1fd60c164339220d1c42f2e9dd495596 SHA-1: d443c04711168281615004ada1a2915cee1173ce SHA-256: 02e4d2f553043e2da9cb5c3c5007e4d330c98d3278d1bedfcb96fb3d0a0b6919
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 CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The presence of \objupdate and the Equation Editor ProgID strongly indicate an attempt to exploit this vulnerability for initial execution. The document body itself is a lure, instructing the user to 'Enable editing', a common tactic to bypass macro security settings.

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_off00004c68.bin
586c77e3ce296320b0034aab39af8631c2bb3ff16c0e011e6b0c330d2ec7e93f		 rtf-objdata-decoded RTF \objdata at offset 0x4C68 1434 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.