Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7e10b3737b2390dc…

MALICIOUS

RTF / .DOC

19.8 KB
MD5: 6cdb32f3fb78b2ecafb3f411f7484b48 SHA-1: 5cdb9c71ad13d761bcfe9ce7528354edfb18916a SHA-256: 7e10b3737b2390dcf6b1ac1590f00ad934536f2238addc71db16dcbaa89aa6cf
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The sample is an RTF document that contains OLE object data, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. The RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics indicate that the document is designed to exploit this vulnerability. The objupdate directive forces OLE activation, leading to the execution of arbitrary code.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • 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.
  • \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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001d1b.bin
128b5a8094250dd319acc7b72d1f0f2b57cc09cf92382695c6663bb186cc20a0		 rtf-objdata-decoded RTF \objdata at offset 0x1D1B 1659 bytes

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